The URL can be used to link to this page

Browse Search

Home My WebLink About20211148.tiffDocuSign Envelope ID: 78829777-7E33-4C0E-80DE-A05813D4CC44 City of iy- Thornton January 29, 2021 Ms. Diana Aungst Weld County Department of Planning Services 1555 N. 17th Ave. Greeley, CO 80631 RE: Weld County Use by Special Review Permit for PIPELINE - DOMESTIC WATER Application for the Thornton Water Project — Second Supplemental Permit Application Dear Ms. Aungst: The city of Thornton (Thornton) is requesting a Use by Special Review (USR) Permit for PIPELINE — DOMESTIC WATER as authorized by Weld County Code (WCC), Chapter 23, Article II, Division 6 Use by Special Review Permits for PIPELINE — DOMESTIC WATER. The location and construction of the Thornton Water Project (TWP) conforms to Weld County's USR Permit for PIPELINE — DOMESTIC WATER requirements as described in the Second Supplemental Permit Application. The TWP is a water delivery system that will convey domestic water purchased by Thornton in the mid -1980's from the Water Supply and Storage Company system to Thornton. In addition to meeting water demand, adding this high quality source provides diversity, enhanced water supply reliability, quality and drought resiliency to Thornton's supply. Thornton's USR Permit application requests approval to locate and construct the TWP, which includes up to approximately 34 miles of a buried 42 -inch domestic water transmission pipeline (water pipeline) and associated appurtenances in unincorporated Weld County. TWP appurtenances include buried valve assemblies, access manways, buried fiber optic cable, a water tank, and two booster pump stations. At the Weld County Land Use hearing on July 10, 2019, on Thornton's USR for Pipelines Permit Application 1 dated December 21, 2018 (Application), the Weld County Board of County Commissioners (BOCC) continued the hearing until July 15, 2020 for Thornton to address statements made by the BOCC including: • Weld County's preference and the policy of the BOCC to not allow parallel running utilities in the Weld County Right -of -Way (ROW). • Thornton to submit an application that covers the totality of the TWP in unincorporated Weld County. • Thornton to obtain a majority of the easements necessary for the TWP before the BOCC will consider the application. DocuSign Envelope ID: 78829777-7E33-4C0E-80DE-A05813D4CC44 Ms. Diana Aungst January 29, 2021 Page 2 On May 15, 2020 Thornton submitted a Supplemental Permit Application (Supplement 1) to address BOCC statements made at the July 10, 2019 hearing. At the Weld County Land Use hearing on July 15, 2020, the BOCC continued the hearing until August 26, 2020 for Thornton to present Supplemental 1 to the Planning Commission on July 21, 2020. At the Weld County Land Use hearing on August 26, 2020, the BOCC changed its position on its preference and policy to not allow parallel running utilities in the Weld County ROW and continued the hearing until September 16, 2020 for Thornton to discuss locating portions of the water pipeline in Weld County ROW with Weld County Public Works staff. During that time, Thornton and Weld County Public Works staff worked together and preliminarily identified six (6) areas where the water pipeline could potentially be located in Weld County ROW. Those locations were presented by Weld County Public Works staff to the BOCC at the continued hearing on September 16, 2020. Staff indicated that those potential areas could be used for the water pipeline subject to more detailed analysis by Thornton. The BOCC then continued the hearing until May 5, 2021 requesting Thornton to analyze the feasibility of locating portions of the water pipeline in Weld County ROW. Thornton performed a ROW feasibility analysis that included non -economic factors for evaluating locating the TWP water pipeline within ROW, including at the six (6) locations presented to the BOCC at the September 16, 2020 hearing, as well as a comparative cost analysis on a per linear foot of pipeline installed. The ROW feasibility analysis was further based on clarification provided by Weld County Public Works staff regarding Weld County requirements and conditions that would need to be met to locate the water pipeline in Weld County ROW. The ROW feasibility analysis included differential costs for locating the water pipeline within Weld County ROW and at the six (6) locations. The ROW feasibility analysis concluded that locating the water pipeline in Weld County ROW was not in the best interests of Weld County or Thornton. The ROW feasibility analysis is included in this Second Supplemental Permit Application (Supplement 2). In addition, Thornton has continued working with impacted property owners to determine the location for the water pipeline that best meets property owners' reasonable preferences and to negotiate easements. Thornton has acquired easements or has purchased land in fee for over 85% of the easements necessary to construct the full length of the TWP and its appurtenances in unincorporated Weld County. Thornton will acquire additional easements and fee parcels in advance of the May 5, 2021 hearing, and will provide an update to the BOCC in advance of that hearing. As a result of the BOCC's request to analyze the feasibility of locating portions of the water pipeline in Weld County ROW, and continuing to work with property owners on alignment, revisions to information that was provided in the Application and Supplement 1 were required. Supplement 2 revisions include: 1) adding information regarding the ROW feasibility analysis; 2) adding discussion on how the TWP conforms with the DocuSign Envelope ID: 78829777-7E33-4C0E-80DE-A05813D4CC44 Ms. Diana Aungst January 29, 2021 Page 3 Comprehensive Plan that became effective on November 23, 2020; 3) replacing Weld County 2035 Transportation Plan discussions to address Weld County 2045 Transportation Plan that was adopted by Weld County on November 9, 2020; 4) adding a new Section Procedural Guide 2021 to demonstrate that the TWP meets the revised USR Procedural Guide requirements that were downloaded from Weld County's website on January 8, 2021; and 5) making minor water pipeline alignment adjustments as a result of continuing to work with property owners. Supplement 2 addresses all planned infrastructure in unincorporated Weld County. This includes information previously submitted in the Application and Supplement 1. The purpose of including previously submitted information in this Supplement 2 is to make it easier for reviewers to evaluate the information in its entirety under one submittal. Supplement 2 addresses areas in unincorporated Weld County which include private or public lands within the boundaries of Weld County and outside the boundaries of any municipality (city or town). Supplement 2 is generally organized to address items discussed at the Pre -Application meetings held on May 27, 2016, August 25, 2016, January 17, 2019, and March 13, 2020 and during a telephone conversation on February 6, 2020, and as required for submission by the Weld County USR Procedural Guide, Application Submittal Requirements (USR Procedural Guide Checklist), January 1, 2020 provided by Weld County, the Weld County USR Procedural Guide (Procedural Guide 2021) that was downloaded from Weld County's website on January 8, 2021, and WCC Chapter 23, Division 6, Section 23-2-590 Application Requirements (WCC Section 23-2- 510), and the review standards described in WCC Chapter 23, Division 6, Sections 23- 2-480 and 23-2-490 (WCC Section 23-2-480 and WCC Section 23-2-490). Supplement 2 includes the following: USR Procedural Guide Checklist • Application Form • Authorization Form • Incorporation or Trust Documents • USR Questionnaire • List of Property Owners • Irrigation Ditch, Lateral, or Pipeline Owners • Mineral Owners Agreement • Recent Deed • Certificate of Conveyances Form • Statement of Taxes • USR Map • Notice of Inquiry • Pre -application Meeting Minutes • Evidence of Adequate Water Supply • Evidence of Adequate Sewage Disposal • Preliminary Drainage Report DocuSign Envelope ID: 78829777-7E33-4C0E-80DE-A05813D4CC44 Ms. Diana Aungst January 29, 2021 Page 4 • Traffic Narrative • Sign Plan • Nuisance Abatement Plan • Landscape and Screening Plan • Decommissioning Plan • Draft Emergency Incident Action Plan • Noise Study • Soils Report • Community Meeting • Application Fee • Investigation Fee Procedural Guide 2021 WCC Section 23-2-590 • Applicant's name and telephone number • Address of the Applicant • Summary statement of the Project • A Certified List of Names Addresses and the Corresponding Parcel Identification Numbers Assigned by the County Assessor of Owner of Surface Properties Located Within One Hundred Fifty (150) Feet of the Pipeline — Domestic Water • The Names and Addresses of Any Owner, Operator, or User of Any Irrigation Ditch, Lateral, or Pipeline that Traverses the Property • The Application Fee WCC Section 23-2-480 and WCC Section 23-2-490 • All reasonable efforts have been made to avoid irrigated cropland or to minimize the negative impacts on agricultural USES and lands. • The PIPELINE - DOMESTIC WATER will not have an undue adverse effect on existing and future development of the surrounding area as set forth in applicable MASTER PLANS. • The design of the proposed PIPELINE - DOMESTIC WATER mitigates negative impacts on the surrounding area to the greatest extent feasible. • The site shall be maintained in such a manner so as to control soil erosion, dust and the growth of NOXIOUS WEEDS. • The applicant has agreed to implement any reasonable measures deemed necessary by the Board of County Commissioners to ensure that the health, safety and welfare of the inhabitants of the COUNTY will be protected, and to mitigate or minimize any potential adverse impacts from the proposed PIPELINE - DOMESTIC WATER. • All reasonable alternatives to the proposal have been adequately assessed, and the proposed action is consistent with the best interests of the people of the COUNTY and represents a balanced use of resources in the affected area. • The nature and location or expansion of the PIPELINE - DOMESTIC WATER will not unreasonably interfere with any significant wildlife habitat and will not unreasonably DocuSign Envelope ID: 78829777-7E33-4C0E-80DE-A05813D4CC44 Ms. Diana Aungst January 29, 2021 Page 5 affect any endangered wildlife species, unique natural resource, known historic landmark or archaeological site within the affected area. • No adverse impact, from stormwater runoff, to the public rights -of -way and/or surrounding properties shall result from the PIPELINE - DOMESTIC WATER. Appendixes • Appendix A Natural and Cultural Resources Assessment - Natural and Cultural Resources Assessment, Thornton Water Project, - Weld County Permit Areas, Weld County, Colorado • Appendix B Stakeholder Outreach Information • Appendix C Best Management Practices • Appendix D Soils Reports • Appendix F Alternative Analysis — Technical Report Thornton Water Project, Reach 2 Alternative Corridors Analysis • Appendix G ROW Feasibility Analysis — Technical Memorandum TWP Feasibility of Alternatively Locating TWP Water Pipeline within Weld County Right -of -Way USR Maps Drainage Narrative Thornton Water Project Water Tank Exception to Stormwater Detention In addition, Thornton would also like to take this opportunity to describe how Thornton has worked with Weld County and with Weld County municipalities and businesses. A description of these activities are as follows: • Though Thornton is a tax-exempt governmental agency, it has made voluntary payments in lieu of taxes for Thornton -owned farms in Weld County since 1987 totaling approximately $5,936,200. • Thornton has provided and presented an annual farm report to Weld County Commissioners each year since 2007 (the 2020 update was cancelled due to the Coronavirus pandemic). This report provides information on the status of Thornton's farms in Weld County. • Thornton has entered Intergovernmental Agreements (IGAs) with the towns of Timnath and Windsor regarding construction of the Thornton Water Project through the towns. • As part of the IGA with the town of Timnath, Thornton annexed three Thornton -owned properties in Timnath's Growth Management Area (GMA) into the town to allow the town to have jurisdiction over the future development of those properties. • Thornton worked with Xcel Energy as well as Weld and Larimer Counties and the towns of Windsor, Timnath, Severance and the city of Fort Collins to identify a location on a Thornton -owned property for the much -needed Xcel Energy Avery Substation. • As part of the IGA with the town of Windsor, Thornton annexed the Thornton -owned property in Windsor's GMA to allow the town to have jurisdiction over the future development of that property, including the development of the Xcel Energy Avery Substation. DocuSign Envelope ID: 78829777-7E33-4C0E-80DE-A05813D4CC44 Ms. Diana Aungst January 29, 2021 Page 6 • Thornton has helped the town of Timnath lease a Timnath-owned farm and continue irrigated agriculture, including a lease of 1.5 Thornton -owned shares in the Water Supply and Storage Company. • Thornton assisted the town of Timnath to quickly dedicate right-of-way needed to realign a dangerous intersection at County Line Road and Weld County Road 80. • Thornton has worked with the towns of Windsor, Timnath and Johnstown to coordinate the location and construction of the TWP through their communities to minimize impacts to planned developments and improvements. Thornton respectfully requests that the BOCC issue a Division 6 Use by Special Review Permit for the TWP in unincorporated Weld County. Please do not hesitate to contact me if I can assist with any questions or information regarding the TWP. I can be reached at 303-255-7790. Sincerely, Mark Koleber Thornton Water Project Director Thornton Water Project Weld County Use by Special Review for Pipeline — Domestic Water Second Supplemental Permit Application Volume 1 of 4 IyThornton Submitted to: Weld County Department of Planning Services 1555 N. 17th Avenue Greeley, CO 80631 Dated: February 24, 2021 Prepared By: CH2M HILL 9191 South Jamaica Street CH2MHILL Englewood, CO 80112 Prepared For: City of Thornton 9500 Civic Center Drive City of Thornton Thornton, CO 80229 Thornton Water Project — Weld County USR Second Supplemental Permit Application Table of Contents Thornton Water Project Weld County Use by Special Review for Pipeline - Domestic Water Second Supplemental Permit Application, Volume 1 of 4 Cover Letter Cover Table of Contents ii Acronyms and Abbreviations xi Introduction I-1 Purpose and Need P-1 USR Procedural Guide Checklist USR Procedural Guide Checklist PG -1 Section 1 Application Form 1-1 Section 2 Authorization Form, If Applicable 2-1 Section 3 Incorporation or Trust Document 3-1 Section 4 USR Questionnaire 4-1 Section 5 List of Property Owners 5-1 Section 6 Irrigation Ditch, Lateral, or Pipeline Owners 6-1 Section 7 Mineral Owners Agreement, If Applicable 7-1 Section 8 Recent Deed 8-1 Section 9 Certificate of Conveyances Form 9-1 Section 10 Statement of Taxes 10-1 Section 11 USR Map 11-1 Section 12 Notice of Inquiry, If Applicable 12-1 Section 13 Pre -application Meeting Minutes 13-1 Section 14 Evidence of Adequate Water Supply 14-1 Section 1 Evidence of Adequate Sewage Disposal 15-1 Section 16 Drainage 16-1 *Drainage Narrative Thornton Water Project Water Pipeline Exceptions to Stormwater Detention WP -1 *Preliminary Drainage Report Thornton Water Project Pump Station 1 Site PS1-1 *Preliminary Drainage Report Thornton Water Project Pump Station 2 Site PS2-1 Section 17 Traffic Narrative 17-1 Section 18 Sign Plan, If Applicable 18-1 Section 19 Nuisance Abatement Plan, If Applicable 19-1 Section 20 Landscape and Screening Plan, If Applicable 20-1 Section 21 Decommissioning Plan, If Applicable 21-1 Section 22 Draft Emergency Incident Action Plan, If Applicable 22-1 TWP USR SUPPLEMENT 2 TABLE OF CONTENTS *DRAFT Thornton Water Project Emergency Incident Action Plan For Weld County 1 Section 23 Noise Study, If Applicable 23-1 *Wave Engineering Noise Study 23-2 Section 24 Soils Report 24-1 Section 25 Community Meeting (Optional) 25-1 Section 26 Application Fee 26-1 Section 27 Investigation Fee 27-1 Procedural Guide 2021 Procedural Guide 2021 PG2021-1 Planning Requirement Checklist PG2021-1 Public Works Requirement Checklist PG2021-3 Environmental Health Requirement Checklist PG2021-3 Planning Questionnaire PG2021-4 Public Works Questionnaire PG2021-6 Environmental Health Questionnaire PG2021-8 WCC Section 23-2-510 Section A Applicant's Name and Telephone Number A-1 Section B Address of the Applicant B-1 Section C Summary Statement of the Project C-1 C.1 Source, capacity, size destination and type of facilities, support STRUCTURES, lines, etc., involvedC-1 C.2 A detailed report shall be submitted which includes information on the following ItemsC-1 C.2.a A description of the PIPELINE— DOMESTIC WATER C-1 C.2.b A description of the preferred route or location of the PIPELINE — DOMESTIC WATER and reasons for its selection C-9 C.2.c Procedures to be employed in mitigating any adverse impacts of the proposed routes or sites. C-16 C.2.d An outline of the planned construction, including startup and commissioning schedule, to include the number of stages and timing of each. C-27 C.2.e Information of any public meeting conducted, to include the location, date, time, attendance and method of advertising. C-36 C.2.f A description of the hazards, if any, of fire, explosion and other dangers to the health, safety and welfare of employees and the general PUBLIC. C-38 C.2.g A description of emergency procedures to be followed in case of a reported failure or accident involving the proposed PIPELINE — DOMESTIC WATER. Such outline shall include actions, if any, required of PUBLIC officials, including fire and police officials, and the names and telephone numbers of appropriate Company officials to notify in an accident or failure should occurC-41 C.2.h A description of the method or procedures to be employed to avoid or minimize the impacts on irrigated agricultural land C-42 C.2.i A discussion of how the proposal conforms with the guidelines of Chapter 22 of this code and any other applicable code provision or ordinance in effect. C-43 C.2.j A Decommissioning Plan C-85 C.2.k A traffic narrative describing construction traffic and permanent or temporary access points. C-85 TWP USR SUPPLEMENT 2 TABLE OF CONTENTS C.2.I A description of any haul routes to be used during construction, identifying roads and bridges involved and the weight of the loads. C-86 C.2.m Soils Reports Required for Pipeline Crossings or Any Pipeline Encroaching in Public Right -of - Way, if Required by the Department of Public Works C-89 Section D A Certified List of Names, Addresses and the Corresponding Parcel Identification Numbers Assigned by the County Assessor of Owner of Surface Properties Located Within One Hundred Fifty (150) Feet of the Pipeline — Domestic Water D-1 Section E The Names and Addresses of Any Owner, Operator, or User of Any Irrigation Ditch, Lateral, or Pipeline that Traverses the Property E-1 Section F The Application Fee F-1 WCC Sections 23-2-480 and 23-2-490 Section G WCC Approval Standards and Application Requirements G-1 WCC Approval Standard G-1 WCC Sections 23-2-480 A.1 and WCC 23-2-490 A All reasonable efforts have been made to avoid irrigated cropland or to minimize the negative impacts on agricultural USES and lands G-1 WCC Sections 23-2-480 A.2 and 23-2-490 B The PIPELINE - DOMESTIC WATER will not have an undue adverse effect on existing and future DEVELOPMENT of the surrounding area, as set forth in applicable MASTER PLANS. G-2 WCC Sections 23-2-480 A.3 and 23-2-490 C The design of the proposed PIPELINE - DOMESTIC WATER mitigates negative impacts on the surrounding area to the greatest extent feasible G-10 WCC Sections 23-2-480 A.4 and 23-2-490 D The site shall be maintained in such a manner so as to control soil erosion, dust and the growth of NOXIOUS WEEDS. G-12 WCC Sections 23-2-480 A.5 and 23-2-490 E The applicant has agreed to implement any reasonable measures deemed necessary by the Board of County Commissioners to ensure that the health, safety and welfare of the inhabitants of the COUNTY will be protected, and to mitigate or minimize any potential adverse impacts from the proposed PIPELINE- DOMESTIC WATER. G-14 WCC Sections 23-2-480 A.6 and 23-2-490 F All reasonable alternatives to the proposal have been adequately assessed, and the proposed action is consistent with the best interests of the people of the COUNTY and represents a balanced use of resources in the affected area G-19 WCC Sections 23-2-480 A.7 and 23-2-490 G The nature and location or expansion of the PIPELINE — DOMESTIC WATER will not unreasonably interfere with any significant wildlife habitat and will not unreasonably affect any endangered wildlife species, unique natural resource, known historic landmark or archaeological site within the affected area. G-25 WCC Sections 23-2-480 A.8 and 23-2-490 H No adverse impact from stormwater runoff to the PUBLIC RIGHTS -OF -WAY and/or surrounding properties as a result of the PIPELINE - DOMESTIC WATER. G-26 WCC Application Requirements G-27 Approval Standards and Requirements Cross -Reference G-28 References R-1 TWP USR SUPPLEMENT 2 TABLE OF CONTENTS iv Thornton Water Project Weld County Use by Special Review for Pipeline - Domestic Water Second Supplemental Permit Application - Appendixes, Volume 2 of 4 Cover Table of Contents ii *Appendixes Appendix A Natural and Cultural Resources Assessment Revised Natural and Cultural Resources Assessment, Thornton Water Project — Weld County Permit Areas, Weld County, Colorado Appendix B Stakeholder Outreach Information Appendix C Best Management Practices Appendix D Soils Reports Appendix E Community Outreach Information Appendix F Alternatives Analysis Technical Report Thornton Water Project, Reach 2 Alternative Corridors Analysis Appendix G ROW Feasibility Analysis Technical Memorandum TWP Feasibility of Alternatively Locating TWP Water Pipeline within Weld County Right -of -Way Thornton Water Project Weld County Use by Special Review for Pipeline - Domestic Water Second Supplemental Permit Application - USR18-0130 Permit Maps, Volume 3 of 3 USR18-0130 Permit Maps Thornton Water Project Weld County Use by Special Review for Pipeline - Domestic Water Second Supplemental Permit Application - Drainage Narrative Water Tank Exception to Stormwater Detention, Volume 4 of 4 *Drainage Narrative Thornton Water Project Water Tank Exception to Stormwater Detention Volume 1 Figures** Figure 4.1a TWP Location Map 4-2 Figure 4.1b TWP Location Map 4-3 Figure 4.2 Example Buried Appurtenances 4-5 Figure 4.3 Example Appurtenance: Water Tank 4-6 Figure 4.4 Water Tank Preliminary Layout 4-6 Figure 4.5 Pump Station 1 Preliminary Layout 4-8 Figure 4.6 Pump Station 2 Preliminary Layout 4-9 Figure 4.7 Construction Activities 4-14 Figure 4.8 TWP Timeline 4-16 TWP USR SUPPLEMENT 2 TABLE OF CONTENTS v Figure 4.9a Geologic Hazards 4-30 Figure 4.9b Geologic Hazards 4-31 Figure 4.10a Flood plains 4-33 Figure 4.10b Flood plains 4-34 Figure 4.11a Potential Staging Locations 4-41 Figure 4.11b Potential Staging Locations 4-42 Figure 4.12a Possible Haul Routes 4-52 Figure 4.12b Possible Haul Routes 4-53 Figure 4.13a Possible TWP Access Locations 4-56 Figure 4.13b Possible TWP Access Locations 4-57 Figure 5.1 Adjacent Property Owner Notification Area 5-20 Figure 5.2 Adjacent Property Owner Notification Area 5-21 Figure 5.3 Adjacent Property Owner Notification Area 5-22 Figure 5.4 Adjacent Property Owner Notification Area 5-23 Figure 5.5 Adjacent Property Owner Notification Area 5-24 Figure 5.6 Adjacent Property Owner Notification Area 5-25 Figure 5.7 Adjacent Property Owner Notification Area 5-26 Figure 5.8 Adjacent Property Owner Notification Area 5-27 Figure 5.9 Adjacent Property Owner Notification Area 5-28 Figure 5.10 Adjacent Property Owner Notification Area 5-29 Figure 5.11 Adjacent Property Owner Notification Area 5-30 Figure 5.12 Adjacent Property Owner Notification Area 5-31 Figure 5.13 Adjacent Property Owner Notification Area 5-32 Figure 5.14 Adjacent Property Owner Notification Area 5-33 Figure 5.15 Adjacent Property Owner Notification Area 5-34 Figure 5.16 Adjacent Property Owner Notification Area 5-35 Figure 5.17 Adjacent Property Owner Notification Area 5-36 Figure 5.18 Adjacent Property Owner Notification Area 5-37 Figure 5.19 Adjacent Property Owner Notification Area 5-38 Figure 5.20 Adjacent Property Owner Notification Area 5-39 Figure 5.21 Adjacent Property Owner Notification Area 5-40 Figure 5.22 Adjacent Property Owner Notification Area 5-41 Figure 5.23 Adjacent Property Owner Notification Area 5-42 Figure 5.24 Adjacent Property Owner Notification Area 5-43 Figure 5.25 Adjacent Property Owner Notification Area 5-44 TWP USR SUPPLEMENT 2 TABLE OF CONTENTS vi Figure 5.26 Adjacent Property Owner Notification Area 5-45 Figure 5.27 Adjacent Property Owner Notification Area 5-46 Figure 17.1a TWP Location Map 17-2 Figure 17.1b TWP Location Map 17-3 Figure 17.2a Railroad Crossings 17-9 Figure 17.2b Railroad Crossings 17-10 Figure 17.3a Possible TWP Access Locations 17-14 Figure 17.3a Possible TWP Access Locations 17-15 Figure 17.4a Possible Haul Routes 17-17 Figure 17.4b Possible Haul Routes 17-18 Figure 17.5 Sample Road Closure Types - (A) Road Closure with Diversion, (B) Partial Road Closure with Flaggers, (C) Road Closure with Diversion 17-21 Figure 24.1a Soils 24-3 Figure 24.1b Soils 24-4 Figure 24.2a Geologic Hazards 24-5 Figure 24.2b Geologic Hazards 24-6 Figure C.2.a.1a TWP Location Map C-2 Figure C.2.a.1b TWP Location Map C-3 Figure C.2.a.2 Example Buried Appurtenances C-4 Figure C.2.a.3 Example Appurtenance: Water Tank C-5 Figure C.2.a.4 Water Tank Preliminary Layout C-5 Figure C.2.a.5 Pump Station 1 Preliminary Layout C-7 Figure C.2.a.6 Pump Station 2 Preliminary Layout C-8 Figure C.2.c.1a Flood plains C-18 Figure C.2.c.1b Flood plains C-19 Figure C.2.c.2a Soil Erodibility C-23 Figure C.2.c.2b Soil Erodibility C-24 Figure C.2.c.3 South Platte River Basin and Associated Alluvial Aquifers C-26 Figure C.2.d.1 TWP Timeline for Weld County C-28 Figure C.2.d.2 Construction Activities C-29 Figure C.2.d.3a Potential Staging Locations C-31 Figure C.2.d.3b Potential Staging Locations C-32 Figure C.2.d.4 Example Open -Cut Construction Section C-33 Figure C.2.ia Zoning C-48 Figure C.2.ib Zoning C-49 Figure C.2.la Possible Haul Routes C-87 TWP USR SUPPLEMENT 2 TABLE OF CONTENTS vii Figure C.2.lb Possible Haul Routes C-88 Volume 1 Tables*** Table I Summary of Minor Water Pipeline Alignment Adjustments 1-3 Table 4.1 Anticipated Water Pipeline Construction and Restoration Times for Open -cut Method for Road Crossings 4-26 Table 4.2 Anticipated Water Pipeline Construction and Restoration Times for Open -cut Method for Road Crossings 4-39 Table 4.3 Anticipated Construction Vehicles 4-47 Table 4.4 Anticipated Construction Vehicles 4-49 Table 4.5 Possible Construction Delivery and Commuting Routes 4-49 Table 4.6 Possible Post -construction Delivery and Commuting Routes 4-51 Table 5.1 List of Surrounding Property Owners within Weld County within 150 feet of the Centerline of the TWP 5-3 Table 5.2 List of Surrounding Property Owners within Larimer County within 150 feet of the Centerline of the TWP 5-18 Table 6.1 List of Owners of Irrigation Ditches or Laterals Traversing the TWP Easements or Appurtenant Facility Sites 6-1 Table 6.2 List of Owners of Pipelines Traversing the TWP Easements or Appurtenant Facility Sites 6-4 Table 17.1 Roadway Classifications and AADT 17-4 Table 17.2 TWP Railroad Crossings 17-8 Table 17.3 Anticipated Construction Vehicles 17-12 Table 17.4 Possible Haul, Delivery, and Commuting Routes 17-16 Table 17.5 Structurally Deficient Bridges Near the TWP 17-19 Table 17.6 Structures Posted for Load Restrictions Near the TWP 17-19 Table 24.1 Summary of Very Limited Rating from the TWP NRCS Soil Reports 24-1 Table C.2.c Impacted Existing Condition Reference to Mitigation Measures Location Supplement 2C-16 Table C.2.d Probable Water Pipeline Construction Method at Defined Existing Features C-34 Table C.2.f Anticipated Water Pipeline Construction and Restoration Times for Open -cut Method for Road Crossings C-41 Table C.2.i Anticipated Water Pipeline Construction and Restoration Times for Open -cut Method for Road Crossing C-75 Table C.2.1 Possible Haul, Delivery, and Commuting Routes C-86 Table G.1 Anticipated Water Pipeline Construction and Restoration Times for Open -cut Method for Road Crossings G-9 Table G.2 Impacted Existing Condition Reference to Mitigation Measures Location in Supplement 2 ..G- 11 Table G.3 Impacted Existing Condition Reference to Mitigation Measures Location Supplement 2 .. G-18 Table G.4 WCC Standards and Application Requirements Cross Reference Guide G-29 TWP USR SUPPLEMENT 2 TABLE OF CONTENTS VIII Volume 1 Exhibits**** Exhibit PG.1a February 6, 2020 Telephone Conversation (page 1 of 4) PG -2 Exhibit PG.1b February 6, 2020 Telephone Conversation (page 2 of 4) PG -3 Exhibit PG.1c February 6, 2020 Telephone Conversation (page 3 of 4) PG -4 Exhibit PG.1d February 6, 2020 Telephone Conversation (page 4 of 4) PG -5 Exhibit PG.2 February 6, 2020 Telephone Conversation E-mail Transmittal PG -6 Exhibit PG.3 February 6, 2020 Telephone Conversation E-mail Confirmation from Weld County PG -6 Exhibit PG -4a USR Procedural Guide (page 1 of 2) PG -7 Exhibit PG -4b USR Procedural Guide (page 1 of 2) PG -8 Exhibit 12.1 Berthoud Response to Weld County Planning 12-2 Exhibit 12.2 Firestone Signed Notice of Inquiry 12-3 Exhibit 12.3 Frederick Signed Notice of Inquiry 12-4 Exhibit 12.4a Mead Signed Notice of Inquiry 12-5 Exhibit 12.4b Mead Response to Notice of Inquiry 12-6 Exhibit 12.5 Milliken Signed Notice of Inquiry 12-7 Exhibit 12.6 Platteville Signed Notice of Inquiry 12-8 Exhibit 12.7 Severance Signed Notice of Inquiry 12-9 Exhibit 12.8a Windsor Response to Notice of Inquiry Request (page 1 of 2) 12-10 Exhibit 12.8b Windsor Response to Notice of Inquiry Request (page 1 of 2) 12-11 Exhibit 12.9a Notice of Inquiry Email Request to Berthoud 12-12 Exhibit 12.9b Notice of Inquiry Email Request Attachment to Berthoud 12-13 Exhibit 12.10a Notice of Inquiry Email Request to Dacono 12-14 Exhibit 12.10b Notice of Inquiry Email Request Attachment to Dacono 12-15 Exhibit 12.11a Notice of Inquiry Email Request to Firestone 12-16 Exhibit 12.11b Notice of Inquiry Email Request Attachment to Firestone 12-17 Exhibit 12.12a Notice of Inquiry Email Request to Fort Lupton 12-18 Exhibit 12.12b Notice of Inquiry Email Request Attachment to Fort Lupton 12-19 Exhibit 12.13a Notice of Inquiry Email Request to Frederick 12-20 Exhibit 12.13b Notice of Inquiry Email Request Attachment to Frederick 12-21 Exhibit 12.14a Notice of Inquiry Email Request to Johnstown 12-22 Exhibit 12.14b Notice of Inquiry Email Request Attachment to Johnstown 12-23 Exhibit 12.15a Notice of Inquiry Email Request to Mead 12-24 Exhibit 12.15b Notice of Inquiry Email Request Attachment to Mead 12-25 Exhibit 12.16a Notice of Inquiry Email Request to Milliken 12-26 Exhibit 12.16b Notice of Inquiry Email Request Attachment to Milliken 12-27 TWP USR SUPPLEMENT 2 TABLE OF CONTENTS ix Exhibit 12.17a Notice of Inquiry Email Request to Platteville 12-28 Exhibit 12.17b Notice of Inquiry Email Request Attachment to Platteville 12-29 Exhibit 12.18a Notice of Inquiry Email Request to Severance 12-30 Exhibit 12.18b Notice of Inquiry Email Request Attachment to Severance 12-31 Exhibit 12.19a Notice of Inquiry Email Request to Timnath 12-32 Exhibit 12.19b Notice of Inquiry Email Request Attachment to Timnath 12-33 Exhibit 12.20a Notice of Inquiry Email Request to Windsor 12-34 Exhibit 12.20b Notice of Inquiry Email Request Attachment to Windsor 12-35 Exhibit 12.21 Notice of Inquiry Email Request Attachment for All Requests 12-36 *Note: Attached report. **Note: Figures included in attached reports* are not included in table of contents list. ***Note: Tables included in attached reports* are not included in table of contents list. ****Note: Exhibits included in attached reports* are not included in table of contents list. TWP USR SUPPLEMENT 2 TABLE OF CONTENTS x Thornton Water Project — Weld County USR Second Supplemental Permit Application Acronyms and Abbreviations AADT Annual Average Daily Traffic ADA Americans with Disabilities Act Application Thornton water Project Weld County Use by Special Review for Pipelines Permit Application 1 BGEPA Bald and Golden Eagle Protection Act BOCC Weld County Board of County Commissioners BMPs Best Management Practices CBP Colorado Butterfly Plant CCR Code of Colorado Regulations CDOA Colorado Department of Agriculture CDOT Colorado Department of Transportation CDOW Colorado Division of Wildlife CDPHE Colorado Department of Public Health and Environment CDPS Colorado Discharge Permit System CFR Code of Federal Regulations CNDIS Colorado Natural Diversity Information System/Source CNHP Colorado Natural Heritage Program Comprehensive Plan Weld County Code, Chapter 22, Comprehensive Plan Corps U.S. Army Corps of Engineers CPW Colorado Parks and Wildlife CR County Road DRCOG Denver Regional Council of Governments DWR Colorado Division of Water Resources ELCO East Larimer County Water District ERO Resources Corporation ESA Endangered Species Act FEMA Federal Emergency Management Agency FR Federal Register FRICO Farmers Reservoir and Irrigation Company GIS Geographic Information System GMA Growth Management Area HUC Hydrologic Unit Code 1-25 Interstate 25 IPM Integrated Pest Management Jurisdictional Waters Waters of the United States MBTA Migratory Bird Treaty Act TWP USR SUPPLEMENT 2 ACRONYMS AND ABBREVIATIONS xi MW Memorandum mgd M 54 NCAR NHD Northern Water NPDES NRCS NWI OAHP OHWM PA -1 PDF Poudre River Preble's Project PSCo ROW RPW RUA SDS Service SPWRAP SWMP Thornton TNW TWP ULTO UPRR USACE USB USDCM USFS USFWS USGS USR USR Procedural Guide Checklist Megawatt Memorandum Draft TWP February 6, 2020 Telephone Conversation with Weld County Planning for USR Supplemental Permit Application million gallons per day Municipal Separate Storm Sewer System National Center for Atmospheric Research National Hydrography Dataset Northern Colorado Water Conservancy District National Pollutant Discharge Elimination System Natural Resources Conservation Service National Wetland Inventory Office of Archeology and Historic Preservation Ordinary High Water Mark Weld County Permit Application Segment 1 Adobe Acrobat © Portable Document Format Cache la Poudre River Preble's Meadow Jumping Mouse Thornton Water Project Public Service Company of Colorado Right -of -Way Relatively Permanent Waters Regional Urbanization Area Safety Data Sheet U.S. Fish and Wildlife Service South Platte Water Related Activities Program Stormwater Management Plan City of Thornton Traditional Navigable Waters Thornton Water Project Ute Ladies' -Tresses Orchid Union Pacific Railroad U.S. Army Corps of Engineers Universal Serial Bus Urban Storm Drainage Criteria Manual U.S. Forest Service U.S. Fish and Wildlife Service U.S. Geological Survey Use by Special Review Weld County Use by Special Review (USR) Procedural Guide, Application Submittal Requirements, January 1, 2020 Procedural Guide 2021 Weld County Use by Special Review (USR) Procedural Guide, Application Submittal Requirements, January 2021 TWP USR SUPPLEMENT 2 ACRONYMS AND ABBREVIATIONS xii WCC WOTUS WSS WSSC Weld County Code Waters of the United States Web Soil Survey Water Supply and Storage Company TWP USR SUPPLEMENT 2 ACRONYMS AND ABBREVIATIONS XIII Thornton Water Project — Second Supplemental Permit Application Introduction The city of Thornton (Thornton), Colorado is requesting a Use by Special Review (USR) permit for the Thornton Water Project (TWP), pursuant to Weld County Code (WCC), Chapter 23, Article II, Division 6 USR Permits for PIPELINE — DOMESTIC WATER. The TWP involves a pipeline sixteen inches in diameter or larger and appurtenant components thereof (such as water tanks, valves or pump stations) designed for transporting domestic water in such pipeline and extending to locations outside of Weld County. The location and construction of the TWP conforms to Weld County's USR Permit for PIPELINE — DOMESTIC WATER requirements as described in this Second Supplemental Permit Application (Supplement 2). The TWP is a water delivery system that will convey domestic water purchased by Thornton in the mid -1980's from the Water Supply and Storage Company system to Thornton. In addition to meeting water demand, adding this high quality source provides diversity, enhanced water supply reliability, quality and drought resiliency to Thornton's supply. Thornton's USR Permit application requests approval to locate and construct the TWP, which includes up to approximately 34 miles of a buried 42 -inch domestic water transmission pipeline (water pipeline) and associated appurtenances in unincorporated Weld County. TWP appurtenances include buried valve assemblies, access manways, buried fiber optic cable, a water tank, and two booster pump stations. At the Weld County Land Use hearing on July 10, 2019, on Thornton's USR for Pipelines Permit Application 1 dated December 21, 2018 (Application), the Weld County Board of County Commissioners (BOCC) continued the hearing until July 15, 2020 for Thornton to address statements made by the BOCC including: + Weld County's preference and the policy of the BOCC to not allow parallel running utilities in the Weld County right-of-way (ROW). + Thornton to submit an application that covers the totality of the TWP in unincorporated Weld County. • Thornton to obtain a majority of the easements necessary for the TWP before the BOCC will consider the application. On May 15, 2020 Thornton submitted a Supplemental Permit Application (Supplement 1) to address BOCC statements made at the July 10, 2019 hearing. At the Weld County Land Use hearing on July 15, 2020, the BOCC continued the hearing until August 26, 2020 for Thornton to present Supplement 1 to the Planning Commission on July 21, 2020. At the Weld County Land Use hearing on August 26, 2020, the BOCC changed its position on its preference and policy to not allow parallel running utilities in the Weld County ROW and continued the hearing until September 16, 2020 for Thornton to discuss locating portions of the water pipeline in Weld County ROW with Weld County Public Works staff. During that time, Thornton and Weld County Public Works staff worked together and preliminarily identified six (6) areas where the water pipeline could potentially be located in Weld County ROW. Those locations were presented by Weld County Public Works staff to the BOCC at the continued hearing on September 16, 2020. Staff indicated that those potential areas could be used for the water pipeline subject to more detailed analysis by Thornton. The BOCC then continued the hearing until May 5, 2021. TWP USR SUPPLEMENT 2 INTRODUCTION I-1 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Thornton performed a ROW feasibility analysis that included non -economic factors for evaluating locating the TWP water pipeline within ROW, including at the six (6) locations presented to the BOCC at the September 16, 2020 hearing, as well as a comparative cost analysis on a per linear foot of pipeline installed. The ROW feasibility analysis was further based on clarification provided by Weld County Public Works staff regarding Weld County requirements and conditions that would need to be met to locate the water pipeline in Weld County ROW. The ROW feasibility analysis included differential costs for locating the water pipeline within Weld County ROW, including at the six (6) locations. The ROW feasibility analysis concluded that locating the water pipeline in Weld County ROW was not in the best interests of Weld County or Thornton. The ROW feasibility analysis is summarized in Section C.2.b and is presented in Technical Memorandum TWP Feasibility of Alternatively Locating TWP Water Pipeline within Weld County Right -of -Way, included in Appendix G, ROW Feasibility Analysis. In addition, Thornton has continued working with impacted property owners to determine the location for the water pipeline that best meets property owners' reasonable preferences and to negotiate easements. There is no provision in the Weld County Code requiring an applicant to have any set percentage of easements in place before an applicant files an application or that precludes the BOCC from considering or approving an application. Accordingly, Thornton does not believe that the BOCC has authority to require Thornton to have any set percentage of easements in place before the BOCC hears Thornton's application. Nevertheless, Thornton accelerated its easement acquisitions within unincorporated Weld County along its pipeline alignment and its fee acquisitions for the water tank and pump station sites. The easements and fee parcels that Thornton has acquired identify where the pipeline, tank and pump stations will be located in unincorporated Weld County. Thornton has, at the time Supplement 2 was filed, acquired over 85% of the easements necessary to construct the full length of the TWP and its appurtenances in unincorporated Weld County, and has purchased land in fee for the water tank. Thornton will acquire additional easements and fee parcels in advance of the May 5, 2021 hearing, and will provide an update to the BOCC in advance of that hearing. As a result of the BOCC's request to analyze the feasibility of locating portions of the water pipeline in Weld County ROW, and continuing to work with property owners on alignment, revisions to information that was provided in the Application and Supplement 1 were required. Supplement 2 revisions include: 1) adding information regarding the ROW feasibility analysis including summary discussion in Section C.2.b and adding Appendix G, ROW Feasibility Analysis; 2) adding discussion on how the TWP conforms with the Comprehensive Plan that became effective on November 23, 2020; 3) replacing Weld County 2035 Transportation Plan discussions to address Weld County 2045 Transportation Plan that was adopted by Weld County on November 9, 2020; 4) adding a new Section Procedural Guide 2021 to demonstrate that the TWP meets the revised USR Procedural Guide requirements that were downloaded from Weld County's website on January 8, 2021; and 5) making minor water pipeline alignment adjustments as a result of continuing to work with property owners on minor pipeline alignment adjustments and as presented in Table I. TWP USR SUPPLEMENT 2 INTRODUCTION 1-2 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE I Summary of Minor Water Pipeline Alignment Adjustments Parcel No. Description of Adjustment Reason for Adjustment USR18-0130 Permit Map # Reference 131129000031 Permanent easement shifted 0 to 25 feet east. Temporary construction easement- added approximately 25 feet on west side and removed 25 feet on east side. Property owner request 28, 29, 30 120933000039 Remove an area of the temporary construction easement. Property owner request 47 120933200051 Shift permanent easement 50 feet to the west and move temporary construction easement to the east side of permanent easement Property owner request to minimize impact to future gravel mining activities 48, 49 120905100015 Shift permanent easement and temporary construction easement approximately 300 feet to the east. Property owner request 69, 70, 71 095730400011 Shift permanent easement and temporary construction easement approximately 130 feet to west at ditch crossing. Remove areas of temporary construction easement on east side. Minimize impact to unknown gas easement 92 095730400010 Shift permanent easement and temporary construction easement approximately 130 feet to west at ditch crossing. Minimize impact to unknown gas easement 92, 93 095730000030 Shift permanent easement and temporary construction easement approximately 70 feet to the west. Required to match alignment adjustment on adjacent property 93 095718300003 Shift permanent easement and temporary construction easement further from railroad tracks on south side and closer on the north side. Property owner request 100, 101, 102 095718000999 Shift permanent easement and temporary construction easement approximately 50 feet to the east. To accommodate adjacent property owner request 100 095718400054 Shorten length of permanent easement and temporary construction easement. To accommodate adjacent property owner request 100, 101 070519200053 Shift permanent easement and temporary construction easement approximately 25 feet to the south. Property owner request to abut planned lot lines to accommodate proposed development 120 095706000033 Minor revision to permanent and temporary construction easements on south end of property. Property owner request 109 070519200046 Shift permanent easement and temporary construction easement approximately 25 feet to south. Line shifts to catch planned lot lines on adjacent property 120 070506301009 Exchanging position of permanent easement and temporary construction easement. Property owner request 127 070506301008 Exchanging position of permanent easement and temporary construction easement. Property owner request 127, 128 095719000057 Revision to access easement to match existing oil and gas access. Property owner request Access Points 1 The minor alignment adjustments were made on parcels previously shown in Supplement 1 and no additional parcels were added. Supplement 2 addresses all planned infrastructure in unincorporated Weld County. This includes information previously submitted in the Application and Supplement 1. The purpose of including previously submitted information in this Supplement 2 is to make it easier for reviewers to evaluate the information in its entirety under one submittal. The following list includes a summary of section revisions made to Supplement 1 and presented in this Supplement 2: • Volume 1, Introduction — o Added background on hearings. o Added summary of the ROW Feasibility Analysis. o Added summary of changes to Supplement 1. o Updated land acquisition status. • Volume 1, Section 4 USR Questionnaire — o Added discussions to demonstrate TWP compatibility with heavy industrial zoning to reflect parcel 095718300003 zone change from agricultural to heavy industrial zoning. TWP USR SUPPLEMENT 2 INTRODUCTION 1-3 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION o Removed discussions that staging areas meet the stormwater exception for parcels with total area less than, or equal to, one (1) gross acre. Weld County Public Works staff referral comments dated June 22, 2020 indicated that this exception only applies to legally defined "parcels". Added that drainage narratives would be provided for staging areas prior to construction per Weld County staff recommended conditions of approval. o Added discussion to explain how the TWP is consistent with the Comprehensive Plan that became effective on November 23, 2020. • Volume 1, Section 5 List of Property Owners — Updated lists of surface property owners within 150 feet of TWP and provided replacement signed affidavit. • Volume 1, Section 16 Drainage — Removed discussions that staging areas meet the stormwater exception for parcels with total area less than, or equal to, one (1) gross acre. Weld County Public Works staff referral comments dated June 22, 2020 indicated that this exception only applies to legally defined "parcels". Added that drainage narratives would be provided for staging areas prior to construction per Weld County staff recommended conditions of approval. Replaced Drainage Narrative TWP Water Pipeline and Temporary Staging Areas Exceptions to Stormwater Detention with Drainage Narrative TWP Water Pipeline Exceptions to Storm water Detention. + Volume 1, Section 17 Traffic Narrative — Replaced Weld County 2035 Transportation Plan discussion to address Weld County 2045 Transportation Plan that was adopted by Weld County on November 9, 2020. + Volume 1, Section 24 Soils Report — Provided explanation that the Natural Resources Conservation Service (NRCS) Soils Reports in Appendix D for the water pipeline were replaced to reflect the adjusted water pipeline alignment. Note: There were no significant changes to soil conditions as a result of the minor adjustments. • Volume 1, Procedural Guide 2021 —Added new Section Procedural Guide 2021 to demonstrate that the TWP meets the revised USR Procedural Guide requirements that were downloaded from Weld County's website on January 8, 2021. • Volume 1, Section C— o Updated land acquisition status. o Added summary of the ROW Feasibility Analysis. o Updated conformance with Weld County Code, Chapter 22 discussions to demonstrate TWP compatibility with heavy industrial zoning to reflect parcel 095718300003 zone change from agricultural to heavy industrial zoning. o Added discussion to demonstrate conformance with Weld County Code, Chapter 22 that became effective on November 23, 2020. + Volume 1, Section G — o Added discussion to explain how the TWP will not have an undue adverse effect on existing and future development of the surrounding area as set forth in the Comprehensive Plan that became effective on November 23, 2020 and Weld County 2045 Transportation Plan that was adopted by Weld County on November 9, 2020. o Added summary of the ROW Feasibility Analysis. o Added that drainage narratives would be provided for staging areas prior to construction per Weld County staff recommended conditions of approval. TWP USR SUPPLEMENT 2 INTRODUCTION 1-4 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • Volume 1, Figures showing water pipeline alignment - Replaced figures to show the adjusted water pipeline alignment. Note: there were no changes to the parcels crossed. + Volume 2, Appendix A Natural and Cultural Resources Assessment — Note: There were no significant changes to environmental and cultural resources as a result of the surveys completed, source updates, and minor alignment adjustments. o Updated the Natural and Cultural Resources Assessment to include additional survey and jurisdictional determination information completed as of January 2021. o Updated information from more current sources, including U.S. Fish and Wildlife Service and Colorado Parks and Wildlife. o Replaced all figures to show the adjusted water pipeline alignment. • Volume 2, Appendix D Soils Reports — Replaced NRCS Soils Reports for adjusted water pipeline alignment. + Volume 2, Appendix G - Added Technical Memorandum TWP Feasibility of Alternatively Locating TWP Water Pipeline within Weld County Right -of -Way, Appendix G, ROW Feasibility Analysis. + Volume 3, USR18-0130 Permit Maps — Replaced USR maps showing the adjusted water pipeline alignment. Supplement 2 addresses areas in unincorporated Weld County which include private or public lands within the boundaries of Weld County and outside the boundaries of any municipality (city or town). Thornton has met multiple times with and has continued to consult by telephone and e-mail communications with staff from the Weld County Planning and Public Works Departments and the Weld County Attorney's Office regarding the TWP, the USR permit application process and permit requirements. Thornton has followed guidance and recommendations from Weld County staff to help ensure a complete permit application submittal. Supplement 2 is generally organized to address items discussed at the Pre -Application meetings held on May 27, 2016, August 25, 2016, January 17, 2019, and March 13, 2020 and during a telephone conversation on February 6, 2020, and as required for submission by the Weld County USR Procedural Guide, Application Submittal Requirements (Procedural Guide Checklist), January 1, 2020 provided by Weld County, and revised USR Procedural Guide requirements that were downloaded from Weld County's website on January 8, 2021, and WCCChapter23, Division 6, Section 23-2-510 Application Requirements (WCC Section 23-2-510), and the review standards described in WCC Chapter 23, Division 6, Sections 23-2-480 and 23-2-490 (WCC Section 23-2-480 and WCC Section 23-2-490). TWP USR SUPPLEMENT 2 INTRODUCTION 1-5 Purpose and Need This section addresses USR Questionnaire, Planning 1.c. The purpose of the TWP is to convey high quality domestic water from the Water Supply and Storage Company (WSSC) system purchased by Thornton in the mid -1980's to enhance Thornton's water supply reliability and drought resiliency, help address source water quality issues, and meet municipal and industrial demands of Thornton's water customers through 2065. Thornton's population is projected to increase from its current estimated population of 145,440 residents (City of Thornton, Housing & Population Report: 2020 3rd Quarter) to 242,000 residents by 2065. Thornton has proactively planned for the anticipated population increase to ensure that Thornton can provide a reliable, high quality, and economical water supply to meet the needs of its residents and businesses. Thornton's existing water system, including an extensive water conservation program, has served to meet municipal and industrial water needs of Thornton's current water customers in its service area, as well as to meet existing contractual obligations. Thornton water supply projects in development will allow Thornton to provide water service up to a population of 158,000 residents. Beyond 158,000 residents, which Thornton projects to reach by 2025, additional water supplies are needed to ensure continued reliable water service to Thornton's water customers. Water from the WSSC system in Northern Colorado purchased by Thornton in the mid -1980's from willing sellers has been decreed in Water Court for use in Thornton, but Thornton currently lacks the infrastructure to deliver that water to Thornton. The TWP will provide the necessary infrastructure for delivery of this water to Thornton and provides the means by which Thornton's customers will receive the benefit of Thornton's decades -long planning for and investment in this additional water supply. The TWP is being configured to deliver an average of 14,000 acre-feet of water annually, which is sufficient to meet the municipal and industrial demands of Thornton's water customers through 2065. In addition to meeting water demand, in adding this high -quality source the TWP provides diversity, enhanced water supply reliability, quality and drought resiliency to Thornton's water supply. TWP USR SUPPLEMENT 2 PURPOSE AND NEED P-1 USR Procedural Guide Checklist USR Procedural Guide Checklist Supplement 1 was organized to address the January 1, 2020 Procedural Guide that is referenced throughout this document as Procedural Guide Checklist. Supplement 1 has been reviewed by Weld County staff, referral agencies, and Weld County Planning Commission. This Supplement 2 is organized in the same order as Supplement 1 pursuant to the Procedural Guide Checklist. Sections 1 through 27 provide required information and in the order listed on the checklist provided in the Procedural Guide Checklist. A revised Weld County USR Procedural Guide (Procedural Guide 2021) was downloaded from Weld County's website on January 8, 2021. However, it references the USR permit process applicable to Weld County Code (WCC) Chapter 23, Article II, Division 4 Use by Special Review and not WCC Chapter 23, Article II, Division 6 Use by Special Review Permits for Pipeline — Domestic Water. The TWP falls under the Division 6 permit requirements for Pipeline — Domestic Water. No procedural guide exists for Pipeline — Domestic Water. Accordingly and similar to the Procedural Guide Checklist, not all of the requirements listed in the Procedural Guide 2021 are applicable to this Supplement 2. To demonstrate that Supplement 2 addresses the requirements listed in the Procedural Guide 2021 requirements, Section Procedural Guide 2021 is included in Supplement 2. A telephone discussion took place on February 6, 2020 at 1:00 PM between the Weld County Planner assigned to the TWP and Thornton's contracted Permit Task Lead for the TWP. The purpose of the telephone conversation was to review the Procedural Guide Checklist to verify the permit application requirements for the TWP. The following exhibits are included behind this page: • Exhibit PG.la through Exhibit PG.ld - Memorandum Draft TWP February 6, 2020 Telephone Conversation with Weld County Planning for USR Supplemental Permit Application (Memorandum), dated, February 7, 2020. • Exhibit PG.2 - E-mail to Weld County Planner transmitting the Memorandum • Exhibit PG.3 - E-mail from Weld County Planner • Exhibit PG.4a and Exhibit PG.4b — USR Procedural Guide Checklist TWP USR SUPPLEMENT 2 USR PROCEDURAL GUIDE CHECKLIST PG -1 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION ((Thornton MEMORANDUM DRAFT Thornton Water Project February 6, 2020 Telephone Conversation with Weld County Planning for USR Supplemental Permit Application TO: Diana Aungst/Weld County COPY TO: City of Thornton FROM: CH2M HILL DATE: February 7, 2020 This memorandum summarizes the telephone discussion on February 6, 2020 at 1:00 PM between Diana Aungst/Weld County Planner II and Jody Henry/CH2M HILL Permit Task Lead for the Thornton Water Project (TWP). The purpose of the telephone conversation was to review the permit application requirements for the TWP Use by Special Review (USR) Supplemental Permit Application. The Weld County USR Procedural Guide (Procedural Guide) was revised on January 1, 2020 and applies to the USR permit process indicated in the Weld County Code (WCC) Chapter 23, Article II, Division 4 Use by Special Review and not WCC Chapter 23, Article II, Division 6 Use by Special Review Permits for Pipeline — Domestic Water. The TWP falls under the permit requirements for Pipeline — Domestic Water. Diana confirmed that no procedural guide exists for Pipeline — Domestic Water and that the Procedural Guide should be used for the TWP USR Supplemental Permit Application with some requirements deemed not applicable. USR PROCEDURAL GUIDE APPLICATION SUBMITTAL REQUIREMENTS The following notes shown in red italicized text summarize the discussion on application submittal requirements for the Supplemental Permit Application as discussed via telephone conversation between Diana Aungst/Weld County Planner II and Jody Henry/CH2M HILL Permit Task Lead. Each application submittal requirement as listed on the January 1, 2020 Procedural Guide is listed followed by notes. 1. Application form. Include in theTWVP USR Supplemental Permit Application. 2. Authorization form, if applicable. Not Applicable. 3. Incorporation documents if the owner is a business entity (LLC, etc.), or trust documents. Not Applicable. 4. Completed Questionnaire. Include in theT1VP USR Supplemental Permit Application. DF.AET TWP MEMO 2C2C0206 PRONE CONVERSATION S LIPP LE MENTA_ FERMI- .AP '_I CATION 1 EXHIBIT PG.1a February 6, 2020 Telephone Conversation (page 1 of 4) TWP USR SUPPLEMENT 2 USR PROCEDURAL GUIDE CHECKLIST PG -2 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION -HCFNTON WA --F PRO. EC - FE F.U4F,Y 6, 220 TEL:F HONE'DON`;EFS.ATION WITH W=LDCOL. NTY PLANNING FOFUSRSUPPLEMENTAL PERMIT APPLICATION 5. A certified list of names, addresses and the corresponding Parcel Identification Number(s) assigned by the County Assessor of the owners of property (the surface estate) within 500 feet of the property. The source of such list shall be the records of the County Assessor, or an ownership update from a title or abstract company or attorney, derived from such records or from the records of the County Clerk and Recorder. If the list was assembled from the records of the County Assessor, the applicant shall certify that such list was assembled within 30 days of the application submission date. Include in the TWP USR Supplemental Permit Application as required per WCC Chapter 23, Article II, Division 6, Section 23-2-470.8.5. The certified list will include surface property owners within 150 feet of the centerline of the proposed preferred alignment. 6. The names and addresses of any owner, operator, or user of any irrigation ditch, lateral, or pipeline that traverses the property, if applicable. Include a table in the TWP USR Supplemental Permit Application of owners of irrigation ditches and pipelines that cross the easement. Also, include additional outreach correspondence (if it exists) similar to what was submitted in the December 21, 2018 Application. 7. A copy of an agreement with the mineral owners associated with the subject property, if applicable. Such agreement shall stipulate that the oil and gas activities on the subject property have been adequately incorporated into the design of the site or shall provide written evidence that an adequate attempt has been made to mitigate the concerns of the mineral owners on the subject property. Not Applicable. CRS 25-65-5.102 does not require this for water pipelines. 8. A copy of the most recent deed to the property and, if the applicant is not the property owner, evidence of interest in the subject land held by the applicant, such as a lease agreement, trust documents, Statement of Authority, or similar evidence. Not Applicable. 9. A Certificate of Conveyances (Chain of Title) form provided by the Department of Planning Services and corn pleted by a Title Insurance or Abstract Company. The date of certification of the form must be within 30 days of the date of application. Not Applicable. 10. A signed Statement of Taxes from the County Treasurer showing no delinquent property taxes for the area referred to in the application materials. Not Applicable. 11. USR map. The applicant shall submit the draft map for preliminary approval to the Department of Planning Services in electronic (.pdf) format. Upon approval, the applicant shall submit a 24" x 36" map on Mylar. Include in the TWP USR Supplemental Permit Application as required per WCC Chapter 23, Article II, Division 6, Section 23-2-520 Mapping Requirement for Pipeline — Domestic Water not as listed in the Procedural Guide. 12. A signed Notice of Inquiry from a municipality or municipalities if the site is located within an Intergovernment Agreement (IGA) boundary or a Coordinated Planning Agreement (CPA) boundary, if a pplica ble. Include in the TWP USR Supplemental Permit Application. Jody Henry to send to Diana Aungst a figure of the proposed alignment and a list of those municipalities that appear to have an IGA or CPA crossing the proposed alignment. Diana to confirm list. JRAfT TWP MEMO .2020ccC5 PHCNE CCNV=FSA IUN SLJPPLEMEN—AL PEEV IT PPPLICAID[ EXHIBIT PG.1b February 6, 2020 Telephone Conversation (page 2 of 4) TWP USR SUPPLEMENT 2 USR PROCEDURAL GUIDE CHECKLIST PG -3 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION THORN -ON 14i/TE=;' ,CJECT -tt, 1C2C I ELEPHONE CON VERS.4I IUN H WELD COON IY ',ANN NG -OK USR SUPPLEMEN IAL PERM I AW_ICAI ON 13. A copy of the pre -application meeting minutes provided by Planning Services. Include in the TWP USR Supplemental Permit Application. Meeting minutes from previous Pre -application meetings will be included. Thornton plans on submitting a Pre -Application Review Request form to Weld County soon to request a meeting to discuss the TWP USR Supplemental Permit Application. 14. A copy of a document showing evidence of adequate water supply (e.g., well permit or letter from water district). Not Applicable. TWP facilities will be unmanned. 15. A copy of a document showing evidence of adequate methods of sewage disposal (e.g., on - site wastewater treatment system (OWTS) (septic)) permit). Not Applicable. TWP facilities will be unmanned. 16. A drainage report, preliminary drainage study, or drainage narrative, as determined by Public Works. Unknown what is required under the revised Weld County Storm Drainage Criteria. New criteria includes an exception from storm water detention requirements as follows: "Pipelines or transmissions lines, excluding laydown yards, metering sites, substations, and any other above ground appurtenances." No definition of "loydown yards" exists in the WCC but it appears to pertain to oil and gas facilities. Requirement will be discussed, and direction given to Thornton at the forthcoming Pre -application meeting for the TWP USR Supplemental Permit Application. 17. A traffic study or traffic narrative including a traffic control plan, as determined by Public Works. Include a traffic narrative in the TWP USR Supplemental Permit Application similar to what was submitted in the December21, 2018 Application. Also, include information required in the USR Questionnaire. 18. A sign plan detailing type, size and number of desired signs with images following the standards set forth in Chapter 23, Article IV, Division 2 and Appendices 23-C through E, if applicable. Not Applicable. The signs proposed for the TWP do not require zoning approval. Include statement in the TWP USR Supplemental Permit Application that the applicable standards in the WCC Chapter 23, Article IV, Division 2 and Appendices 23-C through E will be followed. 19. A nuisance abatement plan, if applicable. Not Applicable. 20. A landscape and screening plan, if applicable. Not Applicable. Include information similar to what was submitted in the December 21, 2018 Application. 21. A decommissioning plan, if applicable. Not Applicable. Include information similar to what was submitted in the December21, 2018 Application. 22. A draft emergency incident action plan, if applicable. Include draft plan in the TWP USR Supplemental Permit Application. If available at this stage of planning for the TWP, include information indicated in the June 25, 2019 email from Weld County Office of Emergency Management. Some of the information required may not be determined until design activities are complete. Include statement that Thornton understands that a final plan will be required before TWP operations as a Condition of Approval. DRAFT TWP ME MC202C0206=HONE CONVERSATONSUPPL:MENTP,_PERMIT A PLICtTICN EXHIBIT PG.1c February 6, 2020 Telephone Conversation (page 3 of 4) TWP USR SUPPLEMENT 2 USR PROCEDURAL GUIDE CHECKLIST PG -4 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TI IOR,\TON `yVATEp PROJECT FEERUA"6, 2020 TELEPHONE CONVERSATION WITH WELD C.:UNITY 'LANNI NG FOR USE. SJPLEMENA_'ERNAITAPP_ICAT Ok 23. A noise study including a noise abatement plan documenting the methods to be utilized to meet the applicable noise standard, if applicable. Not Applicable. Include information similar to what was submitted in the December 21, 2018 Application. 24. A soil report of the site prepared by the Natural Resource Conservation Service or by a soils engineer or scientist. In those instances when the soil report indicates the existence of moderate or severe soil limitations for the uses proposed, the applicant shall detail the methods to be employed to mitigate the limitations. Not Applicable. Include information similar to what was submitted in the December 21, 2018 Application. Jody confirmed that information submitted previously included review of Colorado Geological Survey maps. 25. Community meeting sign -in sheet, minutes, and summary (optional`. The December21, 2018 Application included community meeting information. The TWP USR Supplemental Permit Application will also include it. 26. The application fee. Diana to confirm if application fee k required. 27. Investigation fee, due only if this is a violation case. (50% of the application fee.) Not Applicable. OTHER DISCUSSION ITEMS Diana confirmed that the WCC revisions pertaining to Regional Urbanization Areas (RUA) and approved on February 3, 2020 included exempting Pipelines — Domestic Water from PUD requirement in an RUA. Diana indicated that Planning is currently working on WCC revisions for Chapter 24 and that those revisions and other recent revisions shouldn't impact the TWP USR Supplemental Permit Application. DRAFT TVP k4 Mi 20200205 PHONE CONVERE,A ION SURF _ENENTAL PE Rf‘,1IT A' PLICA-ION EXHIBIT PG.ld February 6, 2020 Telephone Conversation (page 4 of 4) TWP USR SUPPLEMENT 2 USR PROCEDURAL GUIDE CHECKLIST PG -5 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION From: J-lenrv, Jody/DEN To: Diana Aunast Cc: Tom Parko Jr. Mark Koleber; Joanne Herlihy. Simpson, Gerald/DEN Subject: Thornton Water Project and New Weld County USR Procedural Guide Requirments Date: Friday, February 7, 2020 3:57:00 PM Attachments: DRAFT TWP Memo 20200206 Phone Conversation Supplemental Permit Application odf Hi Diana, Thanks for taking the time yesterday to discuss the new Weld County USR Procedural Guide and what requirements pertain to the Thornton Water Project Supplemental Permit Application. As discussed, I have summarized our telephone conversation in the attached memo. Please review and let me know if my understanding of requirements based on our conversation is correct. Thanks, Jody EXHIBIT PG.2 February 6, 2020 Telephone Conversation E-mail Transmittal From: Diana Aunast To: flanrv. Jody/DEN Subject: [EXTERNAL] Re: Thornton Water Project and NO] Requirement for USR Permit Application Date: Thursday, February 13, 2020 6:59:01 PM Jody: I think we should renotify all the jurisdictions. I'll put together the NOI forms. Also, concerning the summary of the phone conversation - all looks good. Because you are adding segments 2 and 3 to the application there is a fee of $5,000. Diana EXHIBIT PG.3 February 6, 2020 Telephone Conversation E-mail Confirmation from Weld County TWP USR SUPPLEMENT 2 USR PROCEDURAL GUIDE CHECKLIST PG -6 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION USE BY SPECIAL REVIEW (USR) PROCEDURAL GUIDE DEPARTMENT OF PLANNING SERVICES 1555 N. 17T -I AVENUE, GREELEY, CO 80631 Nwwv weldcov_nom 1970-400-6100 I FAX 970-304-6498 Note: A pre -application conference with the Department of Planning Services is required prior to the submittal of a USR application. Please submit a Pre -Application Request form. (Available at www.weldgov.com>departments>planning and zoning>land use applications.) Note: For mining or solid waste USRs or for 1041 USRs, use the forms specific to those uses. APPLICATION SUBMITTAL REQUIREMENTS Application form (See attached) Authorization form, if applicable (See attached) Incorporation documents if the owner is a business entity (LLC, etc.), or trust documents. Completed Questionnaire. (See attached). A certified list of names, addresses and the corresponding Parcel Identification Number(s) assigned by the County Assessor of the owners of property (the surface estate) within 500 feet of the property The source of such list shall be the records of the County Assessor, or an ownership update from a title or abstract company or attorney, derived from such records or from the records of the County Clerk and Recorder If the list was assembled from the records of the County Assessor, the applicant shall certify that such list was assembled within 30 days of the application submission date. (See attached affidavit form.) The names and addresses of any owner, operator, or user of any irrigation ditch, lateral, or pipeline that traverses the property, if applicable. A copy of an agreement with the mineral owners associated with the subject property, if applicable. Such agreement shall stipulate that the oil and gas activities on the subject property have been adequately incorporated into the design of the site or shall provide written evidence that an adequate attempt has been made to mitigate the concerns of the mineral owners on the subject property. A copy of the most recent deed to the property and, if the applicant is not the properly owner, evidence of interest in the subject land held by the applicant, such as a lease agreement, trust documents, Statement of Authority, or similar evidence. A Certificate of Conveyances (Chain of Title) form provided by the Department of Planning Services and completed by a Title Insurance or Abstract Company. The dale of certification of the form must be within 30 days of the dale of application. (See attached COC cover sheet.) A signed Statement of Taxes from the County Treasurer showing no delinquent property taxes for the area referred to in the application materials. USR map. The applicant shall submit the draft map for preliminary approval to the Deparlment of Planning Services in electronic (.pdf) format. Upon approval, the applicant shall submit a 24" x 36" map on Mylar. (See attached for map requirements.) A signed Notice of Inquiry from a municipality or municipalities if the site is located within an Intergovernment Agreement (IGA) boundary or a Coordinated Planning Agreement (CPA) boundary, if applicable. A copy of the pre -application meeting minutes provided by Planning Services. A copy of a document showing evidence of adequate water supply (e.g., well permit or letter from water district). A copy of a document showing evidence of adequate methods of sewage disposal (e.g., on -site wastewater treatment system (OWTS) (septic)) permit). Continued on the next page. 01/01/2020 EXHIBIT PG -4a USR Procedural Guide (page 1 of 2) TWP USR SUPPLEMENT 2 USR PROCEDURAL GUIDE CHECKLIST PG -7 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION A drainage report, preliminary drainage study, or drainage narrative, as determined by Public Works. (See attached Questionnaire.) A traffic study or traffic narrative including a traffic control plan, as determined by Public Works. (See attached Questionnaire.) A sign plan detailing type, size and number of desired signs with images following the standards set forth in Chapter 23, Article IV, Division 2 and Appendices 23-C through E, if applicable. A nuisance abatement plan, if applicable. A landscape and screening plan, if applicable. A decommissioning plan, if applicable. A draft emergency incident action plan, if applicable. A noise study including a noise abatement plan documenting the methods to be utilized to meet the applicable noise standard, if applicable. A soil report of the site prepared by the Natural Resource Conservation Service or by a soils engineer or scientist. In those instances when the soil report indicates the existence of moderate or severe soil limitations for the uses proposed, the applicant shall detail the methods to be employed to mitigate the limitations. Community meeting sign -in sheet, minutes, and summary (optional). The application fee. Investigation fee, due only if this is a violation case. (50% of the application fee.) .......... 01/01/2020 2 EXHIBIT PG -4b USR Procedural Guide (page 2 of 2) TWP USR SUPPLEMENT 2 USR PROCEDURAL GUIDE CHECKLIST PG -8 Section 1 Application Form This section addresses Procedural Guide Checklist, application form. See attached application form provided behind this page. TWP USR SUPPLEMENT 2 SECTION 1 APPLICATION FORM 1-1 USE BY SPECIAL REVIEW (USR) APPLICATION FOR PLANNING DEPARTMENT USE: AMOUNT $ APPLICATION RECEIVED BY DATE RECEIVED: CASE # ASSIGNED: PLANNER ASSIGNED: PROPERTY INFORMATION (Attach additional sheets if necessary.) Is the property currently in violation?❑No /IllYes Violation Case Number: Site Address: Multiple See USR Permit Maps Parcel Number: Multiple See USR Permit Maps Legal Description: Multiple See USR Permit Maps Zoning District: Agriculture Section: Multiple See USR Permit Maps Acreage See USR ithi g Permit Wn subdivision?❑ No /®Yes Townsite?❑✓ No 1❑Yes �� If yes, subdivision or townsite name: Floodplain❑ No /©Yes Geological Hazard No /EYes Airport Overlay ✓❑ No /❑Yes PROPERTY OWNER(S) (Attach additional sheets if necessary.) Name: Multiple see USR Permit Maps Company: Phone #: Street Address: City/State/Zip Code: Name: Company: Phone #: Street Address: City/State/Zip Code: Name of proposed business: Email: Email: APPLICANT/AUTHORIZED AGENT (Authorization must be included if there is an Authorized Agent.) Name: Brett E Henry/Executive Director - Infrastructure Department Company: City of Thornton Phone #: 720-977-8700 Email: Brett.Henry@Thorntorca.gov Street Address: 12450 Washington Street City/State/Zip Code: Thornton, Co 80241-2405 I (We) hereby depose and state under penalties of perjury that all statements, proposals, and/or plans submitted with or contained within the application are true and correct to the best of my (our) knowledge. All fee owners of the property must sign this application. If an Authorized Agent signs, an Authorization Form signed by all fee owners must be included with the application. If the fee owner is a corporation, evidence must be included indicating the signatory has the legal authority to sign for the corporation. Signature Brett E. Henry 4/23/2020 Date Signature Date Print Print 01/01/2020 7 Section 2 Authorization Form, If Applicable This section addresses Procedural Guide Checklist, authorization form, if applicable. Thornton is the Applicant and owner of the TWP. On February 6, 2020, Weld County staff stated that an authorization form is not applicable to the TWP. A summary of that discussion is included in section USR Procedural Guide. TWP USR SUPPLEMENT 2 SECTION 2 AUTHORIZATION FORM, IF APPLICABLE 2-1 Section 3 Incorporation or Trust Document This section addresses Procedural Guide Checklist, incorporation documents if the owner is a business entity, or trust documents. Thornton is a home rule municipality in the State of Colorado. Incorporation or trust documents are not applicable to Thornton. TWP USR SUPPLEMENT 2 SECTION 3 INCORPORATION OR TRUST DOCUMENT 3-1 Section 4 USR Questionnaire This section addresses the Procedural Guide Checklist, USR Questionnaire, and WCC as applicable. Planning Questions This section addresses the USR Questionnaire, Planning Questions, WCC Sections 23-2-510 C.2.i and 23-2-510 C.2.n, and the criteria described in WCC Sections 23-2-480A.1, 23-2-480A.2, 23-2-490 A, and 23-2-490 B. P.1 Explain, in detail, the proposed use of the property. Include, at a minimum, the following: P.1.a. Type of use for which the application is being made. Thornton is proposing to locate and construct the TWP, a water delivery system that will convey high -quality domestic water Thornton purchased in the mid -1980's from the Water Supply and Storage Company system in unincorporated Larimer County, through Weld County, to Thornton. This Supplement 2 requests approval to locate and construct a section of the TWP, which includes approximately 34 miles of a buried 42 -inch diameter water pipeline capable of conveying 40 million gallons per day (mgd) and associated appurtenances in unincorporated Weld County, Colorado. The TWP appurtenances in unincorporated Weld County include buried fiber optic cable, various buried water pipeline structures and valve vaults including access manways, blow -off assemblies, air release vaults, and isolation valve vaults, a 1 -million -gallon steel water tank, and two pump stations. TWP Components in Unincorporated Weld County The TWP components in unincorporated Weld County include the following: + Water pipeline. Approximately 34 miles of a buried, 42 -inch diameter water pipeline capable of conveying 40 mgd of water will be constructed in unincorporated Weld County. The water pipeline will be buried at a minimum depth of 4 feet below grade. The depth of bury will vary based on existing utility crossings, road crossings, water crossings, other existing or proposed features, and property owner's reasonable preferences. Typically, the TWP consists of a 50 -foot permanent easement for the water pipeline and an additional 40 -foot temporary easement for construction. The TWP is not located within Weld County ROW or future planned ROW except to cross ROW. Thornton understands that, if the TWP crosses Weld County ROW, then use of that ROW will require Weld County approval. Figure 4.1a and Figure 4.1b show the water pipeline alignment. The water pipeline alignment generally runs north/south and extends from approximately %2 mile south of County Road 92 to County Road 2 as follows: o The water pipeline generally parallels County Road 13 for approximately 1.4 miles in unincorporated Weld County from County Road 92 to 0.4 miles south of County Road 90. o The water pipeline transitions east and south to parallel County Road 13, within 0.25 miles east of County Road 13, for approximately 3.6 miles, to 0.5 miles north of Colorado Highway 14 in unincorporated Weld County, then enters the Town of Timnath for approximately 5.3 miles. o The water pipeline transitions south out of the Town of Timnath near County Road 72 and parallels County Road 13 to County Road 68%% for approximately 1.6 miles in unincorporated Weld County, then enters the Town of Windsor for approximately 3.5 miles. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-1 Thornton Water Project • Rage take Rere� nit Na t�t1z Ins' k-< tees Reservoir Na a DOUGLAS • a:. 52H 1WILL.X LAN OAK•ST OLIVE ST MYRTLE ST CAUREL-ST( LOCUST -§T „rH ST 10THST 5TH T CR 12 i et 14, 0 U CR 10 Thornton WATER PHOJEC' CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/19/2021 Ai R CHARDS LACE RD MOUNTAIN VISTA D C and.S Railroad HARMONY RD .CR WE 0 %/WE OR Grey Reservoir NALL X•L CR 50 LOVELANDI i7 T H ST m a- 0.875 .1 4 T/MNATH• RONALD REAGAN SD Great Western Ra tad JOHNSTOWN 1.75 1 inch = 1.75 miles Miles Water Tank 7l CR 32E \%.75,.8 5" BERTHOUD cR 46 ''U. ti- CR 82 TWP in Unincorporated Weld County TWP outside Unincorporated Weld County County Boundary CR 74 =ko5SRC Pump Station 1 EASTMAS PARro•OR ILLIKEN y • ;N"\;%14j J Q Z••�O W� "Nor Railroad River/Stream/Canal/Drtch Lake/Reservoir GREELEY 37TH ST • Ir CR 78 cr $ 72ND ST' 1P CR. Figure 4.1a TWP Location Map So•.•ces `.-D GOWR Wag: County COOT W1478988_THORNTON_NORTHERN_PROJECTITASK_ORDER 5151_PERMITTINGIGISWAPFILESIWELD_USR%RESOURCE_MAPSIPERMITAPP 20211TWP_LOCATION_MAPMXD JOUAN A N 1/15/2021 9 38 51 AM Thornton Water Project FLAGG Oa RE PKWY ti t BROOMFIELD, m • r••� ellt ►...�a1a'— • b 'i" r � r ii w1DR • ''��g� • tm I y j' Z W � PRCe" • a 6• J3 160TH AVE Thornton WATER PROJECT CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/19/2021 0 0.875 490— ra U. 1.75 1 inch = 1.75 miles Miles TWP in Unincorporated a' Weld County TWP outside Unincorporated "" Weld County —• County Boundary a Railroad River/Stream/Canal/Ditch Lake/Reservoir Figure 4.1b TWP Location Map Sotraes WHO. CDWR. We a Co.M1. CDOT W %418988 THORNTON NORTHERN PROJECflTASK ORDER 5LS 1 PERMITTMGIGISWIAPFRESIWELD USRIRESOURCE MAPSIPERMITAPP 2021ITWP LOCATION MAP M%D JQUAN 111 5(2021 9 38 5' AM THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION o The water pipeline transitions south out of the Town of Windsor near Crossroads Boulevard and generally parallels County Road 13 for 2 miles to US Highway 34, then transitions east parallel to US Highway 34 for approximately 0.5 miles before transitioning south for approximately 4.4 miles to County Road 50, then enters the Town of Johnstown for approximately 3.7 miles. o The water pipeline transitions out of the Town of Johnstown near County Road 44 and parallels County Road 15 for approximately 1 mile to County Road 42, then transitions east for approximately 0.5 miles then south and generally parallels County Road 15%2 for approximately 5.8 miles in unincorporated Weld County and 0.2 miles in the Town of Johnstown to Colorado Highway 66. o The water pipeline transitions east parallel to Colorado Highway 66 for approximately 0.5 miles to County Road 17 where it transitions south for approximately 14.9 miles (approximately 12.6 miles in unincorporated Weld County) to County Road 2. + Appurtenances. o Buried communications. Approximately 34 miles of buried fiber optic cable, including buried manholes, test stations, and other fiber optic cable appurtenances will generally parallel the water pipeline in unincorporated Weld County. The fiber optic cable will be installed in close proximity to the water pipeline. The fiber optic cable will allow Thornton to remotely operate the TWP. The cable will be buried at a minimum depth of 3 feet below grade. The depth of bury will vary based on existing utility crossings, road crossings, water crossings, or other existing or proposed features, and property owner's reasonable preferences. Other buried appurtenances. Various buried water pipeline appurtenances and structures, including access manways, blow off assemblies (used to drain the water pipeline), combination air release valve vaults (used to exhaust air when filling the water pipeline and admitting air during draining operations), and isolation valve vaults will be constructed. Photographs of example appurtenances and structures are shown in Figure 4.2. The size of structures and interior components of manholes and vaults will be designed specifically for the TWP and could vary from the description. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-4 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Combination Air Release Valve Vault. Photo of combination air release valve vault after construction. Vault is a concrete vault, buried below grade. Vault houses air release valves and an access manway. Visible features include the air vent, access hatch, and valve box markers. Blow -off Assembly with Discharge Structure. Photo of blow -off manhole, pump well manhole, and dissipation structure after construction. The blow -off manhole is a concrete manhole that houses a blow - off drain valve. The pump well manhole is a concrete manhole that houses a pump out pipeline. The dissipation structure is a concrete structure located at grade. Visible features include the air vent, dissipation structure, manhole covers, and valve box markers. Isolation Valve Vault. Pioto of isolation vault after construction. Vault is a concrete vault, buried below grade. Vault houses an isolation valve, air release/vacuum valves, and miscellaneous piping. Visible features include the air vent, access hatches, and valve box markers. Blow -off Assembly wit,i Pump Out. Photo of blow -off manhole and pump well manhole after construction. The blow -off manhole is a concrete manhole that houses a blow -off dram valve. The pump well manhole is a concrete manhole that houses a pump out pipeline. Visible features include the air vent, manhole covers, and valve box markers. FIGURE 4.2 Example Buried Appurtenances TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-5 THORNTON WATER PROJECT WELD CO JNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION o Water Tank. An approximate 1 -million -gallon water tank will be constructed on a site located south of the intersection of County Road 13 and County Road 92. This site is next to an existing water tank. The water tank will require an approximate 1.67 -acre site for the approximate 84 -foot diameter, 24 -foot tall steel water tank. Land will be acquired from property owner for this appurtenance. The water tank is planned to be painted a shade of tan to blend into the surrounding area. Gravel access and parking will be constructed and the remaining disturbed area, including vegetation, will be restored to pre -construction conditions. Lighting will be installed for security and will comply with WCC. Six-foot high chain link fencing with barbed wire for security will be located around the perimeter of the site and will comply with WCC. An example photo of a similar tank is shown in Figure 4.3 and the preliminary layout of the water tank site is included on Figure 4.4. FIGURE 4.3 Example Appurtenance: Water Tank FIGURE 4.4 Water Tank Preliminary Layout TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-6 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION In response to Weld County Health Department Comment: "Please include information on how containment would be addressed should catastrophic failure of the one -million -gallon water tank occurs. Are there downstream properties that would be affected?" the following information is provided: The 1 -million -gallon steel water tank will be designed and sealed by a registered Professional Engineer in the State of Colorado. It will be equipped with an overflow pipe having capacity equal to that of the water pipeline to prevent catastrophic failure should the emergency automatic shutdown control system fail to turn off pumps at the high-water elevation. The overflow will discharge on the northeast side of the water tank. Any water discharged would sheet flow to the northeast, off the water tank parcel, to the adjacent agricultural parcel where it would be intercepted by a small natural drainage that flows to the east north east. This drainage flows across agricultural properties for approximately 4.5 miles to Black Hollow Reservoir. There are no structures in the drainage path, and damage from unforeseen discharges from the water tank are not expected. The raw water is not anticipated to contain any harmful contaminants. There are no known Weld County Code and Building Code requirements for secondary containment of unexpected discharges of water from the water tank. Previous discussions with Weld County staff have not indicated a desire for secondary containment, and it is not a typical practice for water tanks such as the one proposed. o Pump stations. There are two pump stations in unincorporated Weld County. Land will be acquired from property owner for these appurtenances. ■ The Pump Station 1 site is located approximately 0.5 miles east of the intersection of County Road 13 and County Road 50. The site is approximately 3.75 acres and will include an approximate 10,000 square foot pump house building and approximately 3,000 square feet of equipment pads outside of the building. Paved access and parking will be constructed and the remaining disturbed areas, including vegetation, will be restored to pre -construction conditions. Lighting will be installed for security and will comply with WCC. Six-foot high chain link fencing with barbed wire for security will be located around the perimeter of the site and will comply with WCC. Figure 4.5 shows the preliminary layout of the Pump Station 1 site. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-7 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION .y` at. ACCESS ROAD I 1 frpt;' asvi r ROW -� !' niiipaswernr- NO BUILDING/ NO STORAGE • • STORM PIPE'S • • GENERATORS 24 TRANSFORMERS \`e'''.1 PUMP STATION _ . • .j;r"; vaimatt**-4•40 LIMITS OF GRADING, TYP 2 PROPOSED FLOW PATH, TYP _A • I sail FIGURE 4.5 Pump Station 1 Preliminary Layout ■ The Pump Station 2 site is located approximately 0.2 miles rorth of the intersection of County Road 17 and County Road 2. The site is approximately 8.40 acres and will include an approximate 15,000 square foot pump house building, an approximate 15,000 square foot forebay, and approximately 3,000 square feet of equipment pads outside the pump station/forebay. Paved access and parking will be constructed and the remaining disturbed areas, including vegetation, will be restored to pre -construction conditions. Lighting will be installed for security and will comply with WCC. Six-foot high chain link fencing with barbed wire for security will be located around the perimeter of the site and will comply with WCC. Figure 4.6 shows the preliminary layout of the Pump Station 2 site. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION FIGURE 4.6 Pump Station 2 Preliminary Layout An emergency backup diesel generator might be located outside at each of the pump stations for emergency backup power if a second electrical feed is not included. If a second electrical feed is feasible and cost-effective, emergency diesel pawered backup generators will not be required. Thornton will continue to coordinate with PVREA and United Power to determine specific requirements for power service to the pump stations. TWP Components in Incorporated Weld County Approximately 11 miles of the TWP are located in incorporated areas of Weld County in Dacono, Firestone, Frederick, Johnstown, Platteville, Severance, Timnath, and Windsor, including roads that have been annexed by local governments. Thornton understands that aaproval and permits will be required with government agencies for the port ons of the TWP located within incorporated areas as appropriate. Information provided in this Supplement 2 on the TWP components located within incorporated areas is of a general nature and is included to present a mare complete scope of the TWP Areas shown as a dashed line on Figure 4.1a and Figure 4.1b show the water pipeline alignment outside of unincorporated Weld County. P.1.b. Current or previous use of the land, if any. The TWP within unincorporated Weld County is located in predominantly rural land use areas designated as agricultural or estate zoning and on one parcel designates as heavy industrial zoning. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE %+ 9 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Figure C.2.ia and Figure C.2.ib show the zoning within the TWP route within Weld County that is associated with this Supplement 2. P.1.c. Include a statement delineating the need for the proposed use. The purpose of the TWP is to convey high quality domestic water from the WSSC system purchased by Thornton in the mid -1980's to enhance Thornton's water supply reliability and drought resiliency, help address source water quality issues, and meet municipal and industrial demands of Thornton's water customers through 2065. Thornton's population is projected to increase from its current estimated population of 143,788 residents (City of Thornton, Housing & Population Report: 2019 4th Quarter) to 242,000 residents by 2065. Thornton has proactively planned for the anticipated population increase to ensure that Thornton can provide a reliable, high quality, and economical water supply to meet the needs of its residents and businesses. Thornton's existing water system, including an extensive water conservation program, has served to meet municipal and industrial water needs of Thornton's current water customers in its service area, as well as to meet existing contractual obligations. Thornton water supply projects in development will allow Thornton to provide water service up to a population of 158,000 residents. Beyond 158,000 residents, which Thornton projects to reach by 2025, additional water supplies are needed to ensure continued reliable water service to Thornton's water customers. Water from the WSSC system in Northern Colorado purchased by Thornton in the mid -1980's from willing sellers has been decreed in Water Court for use in Thornton, but Thornton currently lacks the infrastructure to deliver that water to Thornton. The TWP will provide the necessary infrastructure for delivery of this water to Thornton, and provides the means by which Thornton's customers will receive the benefit of Thornton's decades -long planning for and investment in this additional water supply. The TWP is being configured to deliver an average of 14,000 acre-feet of water annually, which is sufficient to meet the municipal and industrial demands of Thornton's water customers through 2065. In addition to meeting water demand, in adding this high quality source the TWP provides diversity, enhanced water supply reliability, quality and drought resiliency to Thornton's water supply. P.1.d. Describe the uses surrounding the site and explain how the proposed use is compatible with them. The TWP within unincorporated Weld County is located in predominantly rural land use areas designated as agricultural or estate zoning and on one parcel designated as heavy industrial zoning. The TWP is a low impact, passive use that is consistent with the agricultural zone designations. The TWP is not anticipated to impact standard agricultural practices once the water pipeline is installed. The water pipeline and fiber optic cable will be buried below the plow line to prevent interference with anticipated agricultural, estate, and heavy industrial land uses. In addition, land use effects on agricultural uses will be temporary during construction and are anticipated to be minimal after construction. The water pipeline alignment is generally located parallel to property lines or adjacent to Weld County future ROW minimizing the effects to agriculture. Agricultural uses such as farming, grazing, or access within the permanent easement can continue after construction so long as such uses do not interfere with or endanger the operation of the TWP. The buried water pipeline and fiber optic cable are compatible with estate use. The estate zone district allows rural, large -lot residential land uses and land uses that are compatible with very low - density residential areas. The water pipeline alignment is generally located parallel to property lines minimizing the effects to estate zone district land. Estate uses or access within the permanent TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-10 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION easement can continue after construction so long as such uses do not interfere with or endanger the operation of the TWP. The buried water pipeline and fiber optic cable are compatible with heavy industrial use. Heavy industrial use zoning accommodates industrial uses that require larger amounts of space, are more resource -intensive than light industrial, and have limited public access. Thornton worked with the property owner to develop a water pipeline alignment that would minimize impacts to operations on the property. Industrial uses or access within the permanent easement can continue after construction so long as such uses do not interfere with or endanger the operation of the TWP. The site for the water tank is vacant land adjacent to an existing water tank owned by North Weld County Water District. The site is located adjacent to County Road 13, and is part of a larger parcel leased to Anheuser Busch for land application of treated effluent from its Wellington brewery operation. The larger parcel is also actively being considered for purchase by Windsor and other water providers in the area for a regional water treatment plant. Thornton's use of a portion of the larger parcel for its water tank and pipeline are compatible with use of the larger parcel for a regional water treatment plant, should that plan proceed. Existing use, including agricultural use, in areas surrounding the water tank can continue. The site for Pump Station 1 is vacant land of which approximately 75 percent is leased for irrigated farming and the remaining 25 percent is not used. The site is part of a larger parcel used for irrigated agriculture and oil and gas development. Existing uses, including agricultural use, in areas surrounding the pump station can continue. The site for Pump Station 2 is vacant land adjacent to County Road 17 and County Road 2 and can be used for growing non -irrigated grass hay that is cut for feed. Existing uses, including agricultural use, in areas surrounding the pump station can continue. P.1.e. Describe the proximity of the proposed use to residential structures. The majority of the water pipeline is located more than 100 feet from any residential structure. In a select few locations the water pipeline is less than 100 feet from a residence either at the request of property owners or because of other obstructions. The design of the water pipeline will include standards of practice for locating pipelines in close proximity to structures and the final construction drawings will be sealed by a Colorado Licensed Professional Engineer. TWP contractors will implement site specific safety measures and construction methods for construction near structures. P.1.f. Describe the hours and days of operation? (e.g. Mondaythru Friday 8:00 am to 5:00 pm) TWP Design Activities Thornton and TWP contractors, including engineers, biologists, specialists, surveyors, and land agents will periodically visit the site from 8 a.m. to 5 p.m. Monday through Friday for design related activities beginning in 2020. TWP Construction Construction hours will typically be from 7:00 a.m. to 7:00 p.m., Monday through Saturday unless otherwise approved by Weld County. Construction may extend beyond these hours on an as - required and case -by -case approved basis. For example, some construction activities may be required beyond these hours to complete uninterruptible tasks, meet an in-service date, or limit short-term impacts to traffic. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-11 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TWP Post -construction After construction, the TWP facilities could operate year-round, 24 hours a day; however, the water pipeline and appurtenances will be unmanned. It is anticipated that normal operations could include up to two TWP operators traveling in one pickup truck daily along the water pipeline route for a visual inspection and maintenance activities during the hours of 8 a.m. to 5 p.m. TWP operators are also anticipated to conduct up to one visit per day of the water tank and pump station locations to inspect security and operation of each facility. Typically, operation of the pump stations, including video monitoring of site security, will be conducted remotely from another Thornton -owned facility. Up to twice per year, it is anticipated that TWP operators will enter vault and manhole appurtenances to exercise valves and conduct routine maintenance of equipment. To the extent practicable, visual inspections will be from public roads to minimize impacts to property owners. In case of emergency, the operators may be on -site outside of the normal operating hours. P.1.g. Describe the number of shifts and the maximum number of employees per shift. TWP Design Activities Thornton and TWP contractors, including engineers, biologists, specialists, surveyors, and land agents will periodically visit the site from 8 a.m. to 5 p.m. Monday through Friday for design related activities beginning in 2020. No more than 10 workers are anticipated to be on site at any one time during design activities. TWP Construction Shift work may be required based on the contractors means and methods for construction. However, shifts are not anticipated for construction on a day-to-day basis. The TWP may be constructed in multiple construction packages. Work on multiple construction packages may occur concurrently with multiple crews of 10 to 25 workers each. At the peak of construction, approximately 80 to 100 workers could be required and will be working at multiple sites along the TWP. TWP Post -construction No shift work is anticipated for the TWP post -construction. After construction, the TWP facilities could operate year-round, 24 hours a day; however, the water pipeline and appurtenances will be unmanned. It is anticipated that normal operations could include up to two TWP operators traveling in one pickup truck daily along the water pipeline route for a visual inspection and maintenance activities. TWP operators are also anticipated to conduct up to one visit per day of the water tank and pump station locations to inspect security and operation of each facility. Up to twice per year, it is anticipated that TWP operators will enter vault and manhole appurtenances to exercise valves and conduct routine maintenance of equipment. In case of emergency, the operators may be on -site outside of the normal operating hours. P.1.h. Describe the maximum number of users, patrons, members, buyers or other visitors that the use by special review facility is designed to accommodate at any one time. None. The TWP facilities, the water pipeline, the water tank and the pump stations will be unmanned. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-12 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION P.1.i. List the types and maximum numbers of animals to be on the site at any one time (for dairies, livestock confinement operations, kennels, etc.). Not applicable. P.1.j. List the types and numbers of operating and processing equipment to be utilized. The TWP includes approximately 34 miles of a buried 42 -inch diameter water pipeline and associated appurtenances in unincorporated Weld County. The TWP buried appurtenances include fiber optic cable and various buried water pipeline appurtenances and structures, including access manways, blow -off assemblies (used to drain the water pipeline), combination air release valve vaults (used to exhaust air when filling the water pipeline and admitting air during draining operations), and isolation valve vaults. The number of buried structures will be developed during final design and will be based on the final water pipeline grade and hydraulic and surge analysis. The TWP above ground appurtenances include a 1 -million -gallon water tank and two pump stations. The Pump Station 1 site will include a pump house building anticipated to house 5 pumps and equipment pads outside of the building. The Pump Station 2 site will include a pump house building anticipated to house 10 pumps, a forebay, and equipment pads outside the pump station/forebay. Emergency backup diesel generators might be located outside at each of the pump stations for emergency backup power if a second electrical feed is not included. If a second feed is feasible and cost-effective, emergency diesel powered backup generators will not be required. Thornton will continue to coordinate with PVREA and United Power to determine specific requirements for power service to the pump stations. If included, three 2,000 kW generators will be located at each site. The TWP does not consist of nor require any processing equipment. P.1.k. List the types, number and uses of the proposed structures to be erected. • Buried Structures. Various buried water pipeline appurtenances and structures, including access manways, blow off assemblies (used to drain the water pipeline), combination air release valve vaults (used to exhaust air when filling the water pipeline and admitting air during draining operations), and isolation valve vaults will be constructed. The number, size of structures, and interior components of manholes and vaults will be designed specifically for the TWP. • One Water Tank. An approximate 1 -million -gallon steel water storage tank. • Two Pump stations. o Pump Station 1 will include an approximate 10,000 square foot pump house building and approximately 3,000 square feet of equipment pads for transformers outside of the building. o Pump Station 2 will include an approximate 15,000 square foot pump house building, an approximate 15,000 square foot forebay, and approximately 3,000 square feet of equipment pads outside the pump station/forebay. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-13 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION P.1.I. Describe the size of stockpile, storage or waste areas to be utilized, if any. TWP Construction At this time, Thornton anticipates using 13 temporary staging areas with n unincorporated Weld County during construction of the TWP. TWP contractors will determine final areas needed for staging. Each staging area is anticipated to occupy not more than 1 acre of land. Staging areas will be u sed for material storage, parking, equipment storage, field offices, and storage of excavated materials. Parking and vehicle storage during construction will be primar ly on property within the permanent or temporary easement, at temporary staging areas, or on la id owned by Thornton. Typically, a 50 -foot permanent easement for the water pipeline and an additional 40 -foot temporary e asement for construction has been or is in the process of being purchased from property owners. Thornton plans to off-load and temporarily store (string) the water pipe Tong the easement as it is delivered until the water pipe is placed in its permanent buried location. If needed, stockpiling of water pipe could take place within the temporary and permanent easement or at temporary staging areas. Stockpiling in lieu of stringing the water pipe will only be conducted where additional space is required. Excavated materials from trench or structure excavations will be stored-emporarily within the permanent or temporary easement adjacent to the trench or excavation. Topsoil will be stripped and stored separately from excavated trench materials for use during surface restoration. As applicable, pavement, vegetation, and excess materials will be removed from the site and disposed of in accordance with applicable laws and regulations. Spoils from trench excavations, construction - related equipment, materials, and supplies will be stored outside of the 100 -year floodplain per local floodplain regulations. If additional space is required, excavated materials could be stored in temporary staging areas Excavated material or other construction materials will not be stockpiled or deposited near or on streambanks or other watercourse perimeters where they could be wasted away by high water or storm runoff or could encroach upon stream banks. Figure 4.7 shows some of the typical construction activities that occur within the work limits including material stockpiling. Work limits include the permanent and temporary construction e asements and the Weld County approved ROW. FIGURE 4.7 Construction Activities TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 414 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TWP Post -construction No materials are anticipated to be stored or stockpiled for the TWP. Any waste generated at the TWP will be removed on a daily basis. P.1.m. Describe the method and time schedule of removal or disposal of debris, junk and other wastes associated with the proposed use. TWP Construction Thornton and the TWP contractors will provide and maintain trash dumpsters located in several locations along the TWP alignment based on the general plan for construction. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws and regulations. Construction waste will be stockpiled in construction staging areas and removed from the construction site during the construction process. Trash dumpsters will be emptied approximately every 1 to 2 weeks. TWP Post -construction The TWP will not include the need for permanent dumpsters as the water tank, pump stations, and underground water pipeline will be unmanned. Any waste generated at the TWP will be removed on a daily basis. P.1.n. Include a time table showing the periods of time required for the construction of the operation. The TWP will be constructed in multiple construction packages. Construction activities for TWP are proposed to begin in 2020 and end in late 2024/early 2025, and operation of the TWP system is scheduled to begin in 2025 after construction of all TWP packages are complete. Work on multiple construction packages will occur concurrently. Construction of each water pipeline construction package is anticipated to last approximately 2 to 2 %z years, not including revegetation activities. Construction of the water tank is expected to last approximately 1 year, and construction of the pump stations is expected to last 2 years. Contractors will be selected after design activities are complete. The TWP contractors will be required to prepare a detailed schedule for their respective packages and this can be provided to Weld County. The timeline for the TWP extends from 2016 for permitting development to 2025 for startup operations. Figure 4.8 presents the general timeline for major activities. See Section C.2.d for additional information on construction activities. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-15 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Thornton 2016 Permitting and Land Acquisition Design Construction Restoration and Stewardship TWP TIMELINE FOR WELD COUNT\ 2019 2020 2021 2022 2023 2025 2024 Project Startup Project Operational 11.1111111111111 FIGURE 4.8 TWP Timeline P.1.o. Describe the type of lot surface proposed and the square footage of each type (e.g. asphalt, gravel, landscaping, dirt, grass, buildings). TWP Construction Surface impacts for the water pipeline will be temporary during construction. At this time, Thornton anticipates using 13 temporary staging areas within unincorporated Welc County during construction of the TWP. TWP contractors will determine final areas needed for stagirg. Each staging area is anticipated to occupy not more than 1 acre of land and could include temporary gravel surfaces. Temporary gravel surfaces are anticipated to be installed by TWP contractors at the water tank and pump station sites for construction purposes. TWP Post -construction No lots are proposed as part of the water pipeline. The 34 miles of water pipeline in unincorporated Weld County generally traverses agricultural lands, gravel roads, asphalt pavement, trails, sidewalks, and urban landscaping. The water pipeline will be buried and land will be restored to pre - construction conditions in accordance with Weld County standards, other standards, or property owner's reasonable preferences as applicable. The 1.67 -acre water tank site will include up to 5,500 square feet for the steel tank. It is anticipated that up to 9,000 square feet will be gravel for parking and access. The remaining 58,200 square feet is anticipated to be self-sustaining grasslands. The 3.75 -acre Pump Station 1 site will include up to a 10,000 square foot building with approximately 3,000 square feet for equipment pads outside the pump station and 6,000 square feet for emergency generators. It is anticipated that approximately 23,100 square feet will be paved for parking and access to provide all weather access for operation and maintenance of these critically important facilities. The remaining 121,200 square feet is antic pated to be self-sustaining grasslands and drainage features, such as drainage ditches and detenticn ponds. The 8.4 -acre Pump Station 2 site will include up to 15,000 square foot building, a 15,000 square foot forebay with approximately 3,000 square feet for equipment pads outside the pump station/forebay and 6,000 square feet for emergency generators. It is anticipated that approximately 46,900 square feet will be paved for parking and access to provide all weather access for operation and maintenance of these critically important facilities. The remaining 280,F.00 square feet is anticipated TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4 16 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION to be self-sustaining grasslands and drainage features, such as drainage ditches and detention ponds. P.1.p. How many parking spaces are proposed? How many handicapped (ADA) parking spaces are proposed? TWP Construction Parking and vehicle storage during construction will be primarily on property within the permanent or temporary easement, at temporary staging areas, on land owned by Thornton. Americans with Disabilities Act (ADA) compliant parking spaces will be provided at construction trailers on an as needed basis. When additional parking is required, Thornton will negotiate with landowners and commercial businesses for available parking to avoid parking in the public ROW. Temporary staging areas for parking and worker buses or shuttles to transport workers to the active work site may also be implemented to reduce traffic when practicable. TWP Post -construction No permanent parking spaces are anticipated for the water pipeline. The water tank and pump stations will be unmanned facilities. Parking, including handicapped ADA parking, will be provided as required per WCC, building codes, and other applicable requirements. The number of parking spaces required will be developed during design. At the planning phase, it is anticipated that up to five parking spaces will be constructed. P.1.q. Describe the proposed screening for all parking and outdoor storage areas. TWP Construction Visual effects during construction will be temporary and associated with the activities of equipment and construction crews. TWP Post -construction No dedicated permanent parking spaces or outdoor storage areas are anticipated for the water pipeline. No outdoor storage areas are anticipated for the water tank and pump station sites. No screening is anticipated for permanent parking spaces at the water tank and pump station sites. TWP operators traveling in one pickup truck daily are anticipated to conduct up to one visit per day of the water tank and pump station locations to inspect security and operation of each facility. Consequently, there will be minimal parking that occurs at these sites. P.1.r. Describe the existing and proposed landscaping for the site. The majority of the TWP is a buried pipeline that will be installed within six broad existing vegetation communities identified and are as follows: • Mixed upland + Nonnative upland • Riparian • Wetlands TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-17 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • Agricultural lands • Developed/disturbed areas Areas disturbed for construction of the water pipeline will be restored to pre -construction grades and revegetated to pre -construction vegetation where appropriate after construction. Areas disturbed for water tank and pump station sites that are not designated for infrastructure, such as tank/forebay, buildings, parking and access areas, and equipment will be revegetated where appropriate after construction. Restored vegetation will be comparable to existing vegetation. Certified weed -free seed mix consisting of drought -tolerant native grasses and other types of vegetation as appropriate to meet property owner preferences or regulatory requirements will be specified in the storm water management plan (SWMP) for the revegetation of disturbed areas. Disturbed mature vegetation will be replaced, per a property owner's reasonable request, with a like species. P.1.s. Describe the type of fence or other screening proposed for the site. The majority of the TWP is a buried pipeline and will have no fence or other screening. Existing fences removed to accommodate water pipeline construction activities will be restored. The water tank and pump station sites will include 6 -foot high chain link fencing with barbed wire for security. P.1.t. Describe reclamation procedures to be employed as stages of the operation are phased out or upon cessation of the Use By Special Review activity. Thornton has no intent to reclaim, phase out or decommission the TWP. The TWP will be maintained, monitored, and repaired/replaced as needed. P.1.u. Describe the proposed fire protection measures. The water pipeline and water tank do not require fire protection measures. According to the International Building Code 2018 the pump stations are considered a Group F-2 occupancy which is considered a low -hazard industrial classification. With no chemicals being stored onsite which would raise the hazard level of the facilities, neither pump station will require automatic fire sprinkler systems. Based on a review of the National Fire Protection Association the unmanned structures will not require external fire protections measures. P.2. Explain how this proposal is consistent with the Weld County Comprehensive Plan. The water pipeline and appurtenances will be buried with limited above ground equipment. There will be minimal effects to the rural character of Weld County. The water tank and pump stations will be above ground appurtenances and will be constructed on land purchased by Thornton. Thornton will locate and construct the TWP in a manner compatible with existing and planned land uses in Weld County. Thornton is committed to cooperating and coordinating with the agricultural community and industrial and municipal land owners in the vicinity of the TWP. On November 23, 2020 Chapter 22, Comprehensive Plan (Comprehensive Plan 2020) became effective. The Application and Supplement 1 were developed under the WCC, Chapter22, Comprehensive Plan adopted in 2008 (Comprehensive Plan 2008). This section includes a discussion on how the TWP conforms with the Comprehensive Plan 2008 followed by a discussion on how the TWP conforms with the Comprehensive Plan 2020. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-18 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Comprehensive Plan 2008 Consistency 2008 Guiding Principles WCC, Chapter 22, Comprehensive Plan (Comprehensive Plan), is intended to be used for the general purpose of guiding and accomplishing the coordinated, adjusted and harmonious development of Weld County. Thornton intends to comply with the guiding principles of the Comprehensive Plan relevant to the TWP. Private Property Rights Thornton will purchase easements and land through good -faith negotiations with property owners and will only use eminent domain when all other reasonable options have been explored. Thornton's land agents have worked with property owners along the TWP alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' preferences, including routing the water pipeline to limit impacts to the operation of irrigation equipment, structures, trees, and other infrastructure. The process to develop the water pipeline alignment was iterative, and is a result of negotiations with individual property owners, or is a result of detailed land, utility, or resource surveys that revealed engineering or environmental constraints. The TWP is being developed in a manner that is respectful of private property rights. Respect for Agriculture Tradition Criteria used for developing the water pipeline location included minimizing impacts to agricultural uses. Thornton's land agents have worked with property owners along the water pipeline alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to minimize affecting the operation of irrigation equipment. The process to develop the water pipeline route was iterative, and is a result of negotiations with individual property owners or detailed land, utility, or resource surveys that revealed engineering or environmental constraints. Thornton's land agents negotiate the purchase of easements where needed based on fair market value. The easements will grant Thornton an area to construct, operate, and maintain the water pipeline, and property owners will maintain fee title to the land. Property owners can continue to use the land within the easement area for purposes such as farming, grazing, or access, so long as such uses do not interfere with or endanger the operation of the TWP. The predominant land use in the TWP area, agricultural use, is compatible with operation of the TWP because the water pipeline and fiber optic cable will be buried below the plow line. Additional measures that will be implemented to minimize impacts to irrigated agricultural land include: + Stripping and storing topsoil separately from excavated trench materials + Seeding or leaving land fallow in accordance with the individual property owner's agreed -upon reclamation procedures following construction of the water pipeline The TWP will cross multiple irrigation ditches along the water pipeline route within unincorporated Weld County as presented in Section 6. Thornton has begun outreach to each irrigation ditch company to begin coordination activities. See Appendix B for additional information on stakeholder outreach. As part of the negotiation process for acquiring easements, Thornton's land agents coordinate with property owners on lateral ditch crossings to limit impacts to agricultural TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-19 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION operations. Thornton will obtain appropriate agreements for each crossing before construction. No direct effects on water flow, quantity, quality, or timing in the irrigation ditches are anticipated. Crossings will be constructed using either trenchless or open -cut methods as required by the irrigation ditch company and during times the ditch is not running, if required. Fairness in the Land Use Change Procedure and Regulations Addressing Land Use Changes The TWP will not require any land use or zone changes in unincorporated Weld County. Recognition of Weld County's Diversity The TWP represents a low -intensity land use that will be compatible with existing agricultural land use, low density residential development, open space, and other uses, and is otherwise compatible with Weld County's geographic, demographic, cultural, social and economic diversity. To determine the alternative corridor least impactful to local communities, Thornton, in 2015, conducted a series of outreach meetings with local governments and agencies that could be impacted by the TWP. During the initial outreach meeting with each local government and agency, feedback was collected to determine preference(s) and/or determine potential problems, including planned developments, for the location of the water pipeline within the local government or agency's jurisdictional and/or GMA boundaries. Outreach meetings were conducted with the following local governments: + Berthoud • Dacono • Firestone + Fort Collins • Frederick + Greeley + Johnstown • Larimer County + Loveland • Mead • Milliken + Timnath • Weld County + Wellington + Windsor Thornton recognizes that the energy industry is an essential industry in Weld County. As part of the coordination process for the TWP and to help minimize impacts to the energy industry, Thornton presented the TWP at the Energy Industry Working Group (Weld County oil and gas companies) on December 15, 2016. In addition, outreach letters have been sent to initiate coordination of activities to oil and gas companies. Coordination with oil and gas companies continued during the land acquisition process to lessen impacts to existing and planned infrastructure. Where feasible, the water pipeline easement overlaps nonexclusive oil and gas easements and the water pipeline will be TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-20 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION located outside of the overlapping easement to minimize both property owner and oil and gas impacts. Economic Growth The TWP will not have a negative effect on the economic growth of local government or any other existing public facilities and services. The TWP construction contractors will provide crews that are not anticipated to exceed approximately 100 workers at any one time. Some workers may reside outside of the local areas and will require lodging or temporary housing. The number of construction workers on site will depend on the contractor and the construction activity occurring during a particular time. Thornton will endorse hiring local workers. TWP contractors and construction workers will likely support local businesses to meet a need for durable and nondurable goods and services. 2008 Goals and Policies The Comprehensive Plan 2008 contains policies to guide land use within unincorporated areas of Weld County. The information provided in Section C.2.i of the Summary Statement demonstrates that the TWP is consistent with the goals and policies of the Comprehensive Plan 2008. Comprehensive Plan 2020 Consistency 2020 Guiding Principles Comprehensive Plan 2020, Guiding Principles are the foundation for land use policy in Weld County. Thornton intends to comply with the guiding principles of the Comprehensive Plan 2020 relevant to the TWP. Respecting Our Agricultural Heritage Criteria used for developing the water pipeline location included minimizing impacts to agricultural uses. Thornton's land agents have worked with property owners along the water pipeline alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to minimize affecting the operation of irrigation equipment. The process to develop the water pipeline route was iterative, and is a result of negotiations with individual property owners or detailed land, utility, or resource surveys that revealed engineering or environmental constraints. Thornton's land agents negotiate the purchase of easements where needed based on fair market value. The easements will grant Thornton an area to construct, operate, and maintain the water pipeline, and property owners will maintain fee title to the land. Property owners can continue to use the land within the easement area for purposes such as farming, grazing, or access, so long as such uses do not interfere with or endanger the operation of the TWP. The predominant land use in the TWP area, agricultural use, is compatible with operation of the TWP because the water pipeline and fiber optic cable will be buried below the plow line. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-21 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Additional measures that will be implemented to minimize impacts to irrigated agricultural land include: + Stripping and storing topsoil separately from excavated trench materials + Seeding or leaving land fallow in accordance with the individual property owner's agreed -upon reclamation procedures following construction of the water pipeline The TWP will cross multiple irrigation ditches along the water pipeline route within unincorporated Weld County as presented in Section 6. Thornton has begun outreach to each irrigation ditch company to begin coordination activities. See Appendix B for additional information on stakeholder outreach. As part of the negotiation process for acquiring easements, Thornton's land agents coordinate with property owners on lateral ditch crossings to limit impacts to agricultural operations. Thornton will obtain appropriate agreements for each crossing before construction. No direct effects on water flow, quantity, quality, or timing in the irrigation ditches are anticipated. Crossings will be constructed using either trenchless or open -cut methods as required by the irrigation ditch company and during times the ditch is not running, if required. Existing use, including agricultural use, in areas surrounding the water tank can continue. The site for Pump Station 1 is located on vacant land of which approximately 75 percent is leased for irrigated farming and the remaining 25 percent is not used. The site is part of a larger parcel used for irrigated agriculture and oil and gas development. Existing use, including agricultural use, in areas surrounding the pump station can continue. The site for Pump Station 2 is vacant land adjacent to County Road 17 and County Road 2 and is currently not being used, but in the past has been used for growing non -irrigated grass hay that was is cut for feed. Existing use, including agricultural use, in areas surrounding the pump station can continue. Respecting Private Property Rights Thornton has purchased easements and land through good -faith negotiations with property owners, and only used eminent domain when all other reasonable options had been explored. Thornton's land agents have worked with property owners along the TWP alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to limit impacts to the operation of irrigation equipment, structures, trees, and other infrastructure. The process to develop the water pipeline route was iterative, and is a result of negotiations with individual property owners, or is a result of detailed land, utility, or resource surveys that revealed engineering or environmental constraints. The TWP is developed in a manner that is respectful of private property rights. Promoting Economic Growth and Stability The TWP will not have a negative effect on the economic growth of local government or any other existing public facilities and services. The construction, operation, and maintenance of the underground water pipeline and appurtenances will not require any new public facilities or impact existing services such as police, fire, water, waste water, and healthcare. Thornton has purchased easements and land through good -faith negotiations with property owners and only used eminent domain when all other reasonable options had been explored. To determine the water pipeline route least impactful to local communities, Thornton, in 2015, conducted a series of outreach meetings with local governments and agencies that could be impacted by the TWP. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-22 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION During the outreach meetings with each local government and agency, feedback was collected to determine preference(s) and/or determine potential problems, including planned developments, for the location of the water pipeline within the local government or agency's jurisdictional and/or GMA boundaries. The TWP construction contractors will provide crews that are not anticipated to exceed approximately 100 workers at any one time. Some workers may reside outside of the local areas and will require lodging or temporary housing. The number of construction workers on site will depend on the contractors and the construction activity occurring during a particular time. Thornton will endorse hiring local workers. TWP contractors and construction workers will likely support local businesses to meet a need for durable and nondurable goods and services. Protecting Health, Safety, and General Welfare Environmental Hazards Thornton and the TWP contractors will provide and maintain sanitary accommodations for the use of their employees during construction of the TWP in a manner that complies with the requirements and regulations of health departments and other governmental bodies. These accommodations, including trash dumpsters and portable toilets, will be located in several locations along the TWP alignment based on the general plan for construction. TWP contractors will be responsible for supplying and maintaining portable toilets. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws and regulations and that they screen portable toilets from the general public. Construction waste will be stockpiled in construction staging areas and removed from the construction site during the construction process. Trash dumpsters will be emptied approximately every 1 to 2 weeks. The TWP will not include the need for permanent dumpsters or sanitary facilities for domestic purposes as the water tank, pump stations, and underground water pipeline will be unmanned. Construction activities will follow best management practices for the management of wastes to avoid and minimize impacts from potential spills or other releases to the environment. These practices discussed in greater detail below will protect the health, safety and welfare of the inhabitants of Weld County. Hazardous Materials and Waste Management Mitigation Measures Construction, operation, and maintenance activities involving Thornton or the TWP contractors bringing any hazardous materials onto the site will comply with applicable federal, state, and local laws and regulations regarding the handling, storage, disposal, transportation, and use of hazardous substances. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws. If trenching activities uncover previously unknown areas of contamination that are apparent, work will be stopped until the party responsible for such contamination has properly managed and/or disposed of such contamination. Construction staging areas will be located and arranged in a manner to preserve trees and vegetation to the extent feasible. Excavated material or other construction materials will not be stockpiled or deposited near or on stream banks or other watercourse perimeters where they could be washed away by high water or storm runoff, or could encroach upon stream banks. Best management practices (BMPs) will be implemented for stormwater management. A summary of TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-23 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION BMPs to protect water resources from potential contamination is provided in Appendix C. These practices will protect the health, safety and welfare of the inhabitants of Weld County. Fueling Mitigation and Safety Measures TWP Construction If possible, fueling requirements will be met before arrival at the construction site. Heavy equipment left on site for construction activities will require onsite fueling at staging areas or the construction site. No bulk fuel storage is anticipated to occur on site. Fueling vehicles will be equipped with spill kits and fire extinguishers, and personnel will be properly trained in spill prevention, control, and countermeasures. To minimize the potential for a spill during fuel transfers and be prepared in the event of a spill, the following measures, as provided in the Code of Colorado Regulations [CCR] and Code of Federal Regulations [CFR], will be followed during loading/unloading of fuel: • Keep fire away while loading/unloading. Persons in the vicinity are forbidden to smoke, light matches, or carry any flame or lighted cigar, pipe, or cigarette. 49CFR 177.834(c, d). • Fuel will not be loaded/unloaded from any motor vehicle while the engine is running. The exception is when the engine of the vehicle is to be used in the operation of the pump. 49CFR 177.837(a). • The fuel tank records will be reviewed to determine the theoretical fuel tank level. 7CCR 1101- 14 S2-3-1 and S2 -4-2(a)(2.) + The fuel tank level gauge will be inspected to determine the actual fuel tank level before unloading takes place. (Note: Any fuel tank level discrepancies will be resolved before hooking up to the fuel tank.) 7CCR 1101-14 52-3-1 & 52-4-2(a)(2). + The supply truck driver will observe the transfer during the entire operation. 49CFR 177.834(i)(2). + Once the truck is in position, its emergency brake will be applied and reasonable precautions will be taken to prevent motion of the truck during unloading (example: utilize wheel chocks when parked on an incline). 49CFR 177.834(e). + Signs must be posted that remind drivers not to pull away before detaching hoses. 40CFR 112.7(h)(3). • Containers and cargo tanks will be grounded before and during transfer. 49CFR 177.837(b) & (c). + The transfer line must be properly disengaged, and the valves and piping of both the fuel tank and truck must be checked for leaks before allowing the truck to leave the site. (40CFR 112.7 h(4) for trucks). TWP Post -construction If feasible, backup power for the pump stations will be provided by a second feed from the applicable utility provider. Should a second feed not be available, or require significant improvements to the utility grid, backup diesel generators will be installed at both pump stations. The amount of fuel stored will be that required for 36 hours of operation at full load. At Pump Station 1, three 2 -megawatt (MW) diesel generators with approximately 4,150 -gallon underbelly tanks will be installed, if required. In this arrangement, approximately 12,500 gallons of diesel fuel will be stored onsite. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-24 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION At Pump Station 2, three 2 -MW diesel generators with approximately 4,150 -gallon underbelly tanks will be installed, if required. In this arrangement, approximately 12,500 gallons of diesel fuel will be stored onsite. The following measures will be followed for installation and operation of diesel fuel storage installed as part of any emergency generators included with the pump stations: • Location of fuel tanks will comply with required separation distances. 7CCR 1101-14 53-2-2-4 • Application for Permit for Above Ground Storage Tank (AST) will be submitted and obtained for installation of diesel fuel storage tanks. 7CCR 53-2-3 • Spill and overfill protection will be provided during operation, including secondary containment equal to or greater than the volume of diesel fuel being stored. 7CCR 1101-14 S3-3-1 • Release detection will be provided. 7CCR 1101-14 S3-3-3 • Testing and compliance inspections will be completed per applicable code(s). 7CCR S3-3-4. These practices will protect the health, safety and welfare of the inhabitants of Weld County. Traffic and Roads and Mitigation Measures Impacts caused by construction equipment and activity on Weld County roads will be short term during construction. Access will be maintained for local area residents. Emergency vehicle access needs will be maintained and construction activities coordinated with local fire departments, police departments, ambulance services, and other emergency responders as necessary. Thornton places a high priority on safety during construction. Thornton will coordinate with local school districts regarding construction and haul routes and school bus traffic. TWP contractors will implement traffic management plans based upon local traffic control requirements and general safe operating practices. Proper signage, flaggers, lighting, speed limits, work hours, postings, notifications, and other precautionary safety measures will be taken to protect the residents of Weld County and the TWP contractors' employees. The water pipeline construction will utilize trenchless construction methods under Weld County roads where required by Weld County, resulting in little to no disruption to traffic at those locations. Temporary traffic delays and detours will be needed where the water pipeline is installed by open - cut construction across existing roads. Traffic disruption will be temporary, and will cease after construction. Traffic control plans will be implemented before construction, subject to approval and acquisition of permits from Weld County Engineering. If open -cut construction is approved by Weld County at road crossings, Table 4.1 presents the number of anticipated days to construct the water pipeline and restore ROW for various road functional classifications. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-25 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 4.1 Anticipated Water Pipeline Construction and Restoration Times for Open -cut Method for Road Crossings Road ROW Road Surface Anticipated Anticipated Anticipated Classification Length Closure Number of Days for Number of Days Water Pipeline for ROW Installation Restoration Local 60 Gravel Full Local 60 Paved Full Collector 80 Gravel Partial Collector 80 Paved Partial Arterial 140 Paved Partial 2 2 2 2 3 2 2 2 3 3 Additional information and mitigation measures are presented in Section 17, Traffic Narrative. These practices will protect the health, safety and welfare of the inhabitants of Weld County. Operations One of the greatest risks to buried pipelines is excavation by individuals unaware of the location of a pipeline. Pipeline markers will be installed in the pipeline permanent easement to indicate that a water pipeline is buried nearby. The markers will identify the water pipeline, Thornton as the pipeline operator, the operator's 24 -hour emergency contact number, and the area's utility notification number. Marking tape indicating that a water pipeline is buried in the location will also be installed above the water pipeline for the entire length of the water pipeline. The majority of the water pipeline in unincorporated Weld County will be located within permanent easements. This approach reduces the probability that individuals could damage the water pipeline with ground - disturbing activities. The water pipeline will be designed and constructed to be water tight. Pipe materials will be required to undergo shop testing before installation as well as hydrostatic field testing after installation. The water pipeline and appurtenances will be coated and lined to prevent corrosion. As an additional safety measure, project components will be installed with cathodic protection, which will control the corrosion of a metal surface. Cathodic protection systems are commonly used to protect metallic water pipelines. These practices will protect the health, safety and welfare of the inhabitants of Weld County. 2020 Goals and Objectives The Comprehensive Plan 2020 contains goals that are desired ambitions and results to be pursued by Weld County within unincorporated areas of Weld County. The objectives help clarify the goal's intent. The information provided in Section C.2.i of the Summary Statement demonstrates that the TWP is consistent with the goals and objectives of the Comprehensive Plan 2020. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-26 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION P.3. Explain how this proposal is consistent with the intent of the zone district in which it is located. The TWP within unincorporated Weld County is located in areas designated as A (Agricultural) Zone District, E (Estate) Zone District, and 1-3 (Heavy Industrial) Zone District. WCC Section 23-3-40 KK identifies domestic water pipelines are acceptable as a Use by Special Review in the agricultural zone district. WCC Section 23-3-430 E identifies domestic water pipelines are acceptable as a Use by Special Review in the estate zone district. WCC Section 23-3-330 F identifies domestic water pipelines are acceptable as a Use by Special Review in the heavy industrial zone district. Chapter 23 of the WCC outlines general provisions, procedures and permits, and zone district designations. This Supplement 2 is consistent with the general provisions and procedural requirements in Article II, Division 6, Use by Special Review Permits for PIPELINE — DOMESTIC WATER. The TWP within unincorporated Weld County is located in predominantly rural land use areas designated as agricultural or estate zoning and one parcel designated as heavy industrial zoning. The TWP is a low impact, passive use that is consistent with the agricultural zone designations. The TWP is not anticipated to impact standard agricultural practices once the water pipeline is installed. The water pipeline and fiber optic cable will be buried below the plow line to prevent interference with anticipated agricultural and estate land uses. In addition, land use effects on agricultural uses will be temporary during construction and are anticipated to be minimal after construction. The water pipeline alignment is generally located parallel to property lines or adjacent to Weld County future ROW minimizing the effects to agriculture. Agricultural uses such as farming, grazing, or access within the permanent easement can continue after construction so long as such uses do not interfere with or endanger the operation of the TWP. The buried water pipeline and fiber optic cable are compatible with estate use. The estate zone district allows rural, large -lot residential land uses and land uses that are compatible with very low - density residential areas. The water pipeline alignment is generally located parallel to property lines minimizing the effects to estate zone district land. Estate uses or access within the permanent easement can continue after construction so long as such uses do not interfere with or endanger the operation of the TWP. The buried water pipeline and fiber optic cable are compatible with heavy industrial use. Heavy industrial use zoning accommodates industrial uses that require larger amounts of space, are more resource -intensive than light industrial, and have limited public access. Thornton worked with the property owner to develop a water pipeline alignment that would minimize impacts to operations on the property. Industrial uses or access within the permanent easement can continue after construction so long as such uses do not interfere with or endanger the operation of the TWP. The site for the water tank is vacant land adjacent to an existing water tank owned by North Weld County Water District. The site is located adjacent to County Road 13, and is part of a larger parcel leased to Anheuser Busch for land application of treated effluent from its Wellington brewery operation. The larger parcel is also actively being considered for purchase by Windsor and other water providers in the area for a regional water treatment plant. Thornton's use of a portion of the larger parcel for its water tank and pipeline are compatible with use of the larger parcel for a regional water treatment plant, should that plan proceed. Existing use, including agricultural use, in areas surrounding the water tank can continue. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-27 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION The site for Pump Station 1 is vacant land of which approximately 75 percent is leased for irrigated farming and the remaining 25 percent is not used. The site is part of a larger parcel used for irrigated agriculture and oil and gas development. Existing uses, including agricultural use, in areas surrounding the pump station can continue. The site for Pump Station 2 is vacant land adjacent to County Road 17 and County Road 2 and can be used for growing non -irrigated grass hay that is cut for feed. Existing uses, including agricultural use, in areas surrounding the pump station can continue. P.4. Explain how this proposal will be compatible with future development of the surrounding area or adopted master plans of affected municipalities. The TWP represents a low -intensity land use that will be compatible with low density residential development, open space, and other uses. The water pipeline alignment is generally located parallel to property lines or adjacent to Weld County future ROW. Use within the permanent easement and surrounding sites can continue after construction, so long as such uses do not interfere with or endanger the operation of the TWP. The TWP will not have a negative effect on local government or any other existing public facilities and services. The construction, operation, and maintenance of the underground water pipeline and appurtenances will not require any new public facilities or impact existing services such as police, fire, water, waste water, and healthcare, and therefore, would not impact future development. To determine locations of the TWP that would be least impactful to local communities, Thornton, in 2015, conducted a series of outreach meetings with local governments and agencies that could be impacted by the TWP. During the initial outreach meeting with each local government and agency, feedback was collected to determine preference(s) and/or determine potential problems, including planned developments, for the location of the water pipeline within the local government or agency's jurisdictional and/or GMA boundaries. Input from local governments and agencies was utilized in developing the TWP. Outreach meetings were conducted with the following local governments: + Berthoud + Dacono • Firestone + Fort Collins + Frederick • Greeley + Johnstown • Larimer County • Loveland + Mead • Milliken + Timnath + Weld County • Wellington + Windsor TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-28 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION P.5. Explain how this proposal complies with Article V and Article XI of Chapter 23 if the proposal is located within any Overlay Zoning district (Airport, geologic Hazard, or Historic Townsites Overlay Districts) or a Special Flood Hazard Area identified by maps officially adopted by the County. Airport Overlay District The TWP is not located within the Airport Overlay District. Geologic Hazards Overlay District A desktop review was conducted to identify the potential for geologic hazards along the TWP. Colorado Geological Survey publishes information about geologic hazards such as abandoned mine lands, avalanches, collapsible soils, corrosive soils, debris flows/mudslides, earthquakes, subsidence, heaving bedrock, landslides, rockfall, and swelling soils. Available maps were reviewed for indications of known geologic hazards. In addition, Weld County's GIS Digital Database, which includes identified geological hazards, was evaluated during the review, with information shown on Figure 4.9a and Figure 4.9b. Based on the desktop review, the majority of the TWP has no identified geologic hazards and the hazards identified are not considered a "active". Weld County's GIS Data shows two inactive faults along the water pipeline alignment. Based upon mapping conducted by the Colorado Geological Survey (Colorado Earthquake Hazards Mitigation Council, 2013), the mapped faults identified in Weld County's GIS Data are not identified as quaternary faults (i.e. faults which have been active in the past 1.8 million years) and as such are generally not considered "active". Due to the inactivity of the faults and the lack of recorded earthquakes in the area, the risk of shallow earthquakes and ground movements is considered low. Construction risks therefore are limited to poor rock conditions (i.e. fault breccia and gouge), spatially rapid changes in ground conditions across fault zones, and the potential for perched water conditions. Potential mitigation measures in this area include: • Limiting the vertical alignment of the water pipeline to the surficial soils, where sufficient cover exists. + Open -cut construction methods. • Additional dewatering capacity in the case of rapid increases of water inflows. Weld County's GIS Data does not show abandoned coal mines along the water pipeline alignment. The water pipeline crosses the historical Boulder -Weld coal field with abandoned mine workings identified at a range of depths, with subsidence features having been reported in regions of relatively shallow mining. A review was conducted of U.S. Geological Survey (USGS) Geologic Investigations Series 1-2735, Version 1.0 (Roberts, Hynes, and Woodward, 2001) maps showing the extent of mining, locations of mine -shafts, adits, air shafts, and bedrock faults, and thickness of overburden above abandoned coal mines in the Boulder -Weld coal field, Boulder, Weld, and Adams Counties. The maps do not indicate undermined areas along the water pipeline alignment. The Colorado Landslide Inventory Map Viewer, (Colorado Geological Survey) was evaluated to view records regarding landslides in Colorado. The viewer contains polygon records of landslides and unstable slope areas digitized from multiple sources and multiple scales by the Colorado Geologic Survey. The viewer does not indicate records of landslides nor unstable slope areas along the water pipeline alignment. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-29 Thornton Water Project CR 12 die) CR 10 Thornton alZ cc to • 2, J U� CITY OF THORNTON COLORADO 12450 WASHINGTON ST 0 U S 0.875 JOHNSTOWN 1.75 Miles CR 46 TWP in Unincorporated Weld County TWP outside Unincorporated Weld County —• County Boundary a T Railroad River/Stream/ CanaVDitch Lake/Reservoir Fault Line 0 Mine Extent cc IQ 2 w Depth of Cover above Abandoned Coal Mines 7-10-49 50-99 100 - 149 150 - 199 CR 48 200 - 249 Figure 4.9a al 250 - 299 Geologic Hazards al 300-349 350 - 399 400-9999 THORNTON, CO 80241-2405 1/22/2021 1 inch = 1.75 miles Sources NH0 GDWR Wt*Itf County COOT wt 476G682HORNTON_NORTHERN_PROJECTtTASK_ORDER_5151_PERMITTINGCISWAPFILESWVELD uSRtRESOURCE_MAPSPERMITAPP_20210EOLOGIC_HAZAROSMXO JOUAN¶/22I2021104002 AM Thornton Water Project IASPE c� Thornton CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241.2405 1/22/2021 bar 160TH AVE r 0 S 0.875 1.75 1 inch = 1.75 miles Miles 2 TWP in Unincorporated a Weld County TWP outside Unincorporated Weld County —• County Boundary Railroad River/Stream/ Canal/Ditch Lake/Reservoir Fault Line 0 Mine Extent Depth of Cover above Abandoned Coal Mines 0.49 50-99 100.149 150 - 199 •sus}� L≤ DENVER�ST D LONGS PEAK St; — f. BUSH ST. _. 200 - 249 Figure 4.9b is 250- 299 Geologic Hazards ON 300 - 349 350 - 399 400 - 9999 Sources NHD. COWR, Weld County, COO T W 4189811 THORNTON NORTHERN PRO 1ECT\TASIC ORDER 515 1 PERMITTWGIGISWAPFRESMEtD USRIRESOURCE MAPS\PERMITAPP 20211GEOLOGIC HAZARDS MXO iQUAN 1/22/2021 '0-4002 AM THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION A subsurface geotechnical investigation of geologic conditions utilizing soil and rock borings will be completed during design of the TWP to further determine the subsurface soil conditions and associated geological hazards. Mitigation measures will be further refined during design to meet site -specific geological hazards. Historic Townsites Overlay District Thornton reviewed the list of historic townsites provided by Weld County staff with Weld County Online Mapping and no historic townsites were identified within the TWP. Special Flood Hazard Area The TWP crosses five designated 100 -year floodplains in unincorporated Weld County as described herein and as shown on Figure 4.10a and Figure 4.10b. The TWP will not alter floodplains. The water pipeline will utilize trench less construction methods under waterbody crossings such as Waters of the United States (WOTUS) (jurisdictional waters), including streams, rivers, lakes, and wetland areas. Work conducted within the floodplain fringe areas will be restored to pre -construction conditions and grades. Therefore, the TWP will mitigate impacts on the hydraulics and hydrology of the floodplain. Because impacts will be mitigated, no modeling has been conducted for this attachment. Thornton will obtain Floodplain Development permits and other approvals as required for floodplain crossings from Weld County or other agency as required after design has progressed. Information will be provided to Weld County as required to obtain permits. The TWP crosses five designated 100 -year floodplains in unincorporated Weld County. Floodplain crossing information was obtained from Weld County GIS data collected on January 8, 2021 from the online Weld County Downloadable Data repository. Floodplain crossings in unincorporated Weld County are shown on Figure 4.10a and Figure 4.10b and identified below: + Big Dry Creek near County Road 17 + Little Dry Creek near County Road 17 + Saint Vrain Creek near Colorado Highway 66 + Tributary to Saint Vrain Creek approximately 1/3 mile south of County Road 34 near Diamond Reservoir + Big Thompson River near County Road 13% Floodplain crossings will utilize open -cut construction in the fringe area of the floodplain and trenchless construction methods under the ordinary high water mark and associated wetlands so that there will be no impact to jurisdictional waters. Spoils from trench excavations, construction - related equipment, materials, and supplies will be stored outside of the 100 -year floodplain per local floodplain regulations. Fringe areas using open -cut construction will be restored to pre - construction grades and vegetation after construction. Trenchless construction methods could include methods such as tunneling or auger boring techniques. Where trench less construction methods are used, shafts will be located on either side of the water resource for launching and receiving the water pipeline and the fiber optic cable and will be located outside of the normal high water mark and associated wetlands. Shafts will be backfilled and compacted, and affected areas will be restored to pre -construction conditions. A geotechnical investigation of geologic conditions near crossing locations will be completed during design. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-32 Thornton Water Project T BERTHOUD C!� 10P lyi AV --; y I f s CR 10 Thornton ?LATER PIioJE1:T CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241-2405 122/2021 0 ci 0.875 JOHNSTOWN 1 75 1 inch = 1 75 miles Miles CR46 TWP in Unincorporated Weld County TWP outside Unincorporated Weld County County Boundary r. — Railroad River/Stream/Canal/Ditch Lake/Reservoir 100-yr Floodplain 100-yr Floodway W 2 W Figure 4.10a Floodplains Sources FEMA NHO COMM Weld Caner COOT W M7EOEE_THORNTON_NORTHERN_PROJECTITASIC_OROER_5t5 1_ PERMITTINGCI9NAAPFILESMNELO_USRIRESOURCE_MAPSIPERMITAPP_20211FL000PLAINS MXO JOUAN 1!22!1021 10 35 MI AM Thornton Water Project r+ ( Thornton WATER PROJECT CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/22/2021 0 S 0.875 1.75 1 inch = 1.75 miles Miles �. TWP in Unincorporated Weld County TWP outside Unincorporated Weld County County Boundary 1 Railroad River/Stream/Canal/Ditch Lake/Reservoir 100-yr Floodplain 100-yr Floodway Figure 4.10b Floodplains Sources. FEMA. NHO. CDWR, We c Cawing. COOT W A189$$ THORNTON NORTHERN PROAECT\TASK ORDER 515 I PERMITTINGwGISwAPFKESSWELD USRIRESOURCE MAPSIPERMITAPP 202 UFLOODPLAINS 4X0 .QUAN 102/2021 10 35 48 AM THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Currently, no areas have been identified that may pose a risk to trenchless construction methods; however, should any such locations be identified throughout the geotechnical investigation, Thornton will consult with applicable parties as required, including the affected property owners, Weld County, and other agencies to develop an alternative approach that will minimize impacts. The general standards required per WCC Chapter 23 that are applicable to the TWP will be met and include: + WCC Section 23-11-270 - A Floodplain Development Permit shall be required for all uses occurring within the FEMA mapped 100 -year floodplain to ensure conformance with the provisions of this ordinance and federal and state regulations. Thornton will obtain a Floodplain Development Permit for floodplain crossings as required. P.6. If the proposed use is to be located in the A (Agricultural) Zone District, explain your efforts to conserve prime agricultural land in the locational decision for the proposed use. The TWP is a low impact, passive use that is consistent with the agricultural setting and zone designation. The water pipeline traverses across areas designated as prime agricultural land. The TWP is a low impact, passive use that is consistent with the agricultural zone designations. The TWP is not anticipated to impact standard agricultural practices once the water pipeline is installed. The water pipeline and fiber optic cable will be buried below the plow line to prevent interference with anticipated agricultural and estate land uses. In addition, land use effects on agricultural uses will be temporary during construction and are anticipated to be minimal after construction. The water pipeline alignment is generally located parallel to property lines or adjacent to Weld County future ROW minimizing the effects to agriculture. Agricultural uses such as farming, grazing, or access within the permanent easement can continue after construction so long as such uses do not interfere with or endanger the operation of the TWP. Criteria used for developing the water pipeline location included minimizing impacts to agricultural use. Thornton's land agents have worked with property owners along the water pipeline alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to minimize affecting the operation of irrigation equipment. The process to develop the water pipeline route was iterative, and are a result of negotiations with individual property owners or detailed land, utility, or resource surveys that revealed engineering or environmental constraints. Additional measures that will be implemented to minimize impacts to irrigated agricultural land include: + Stripping and storing topsoil separately from excavated trench materials • Seeding or leaving land fallow in accordance with the individual property owner's agreed -upon reclamation procedures following construction of the water pipeline The TWP will cross multiple irrigation ditches along the water pipeline route within unincorporated Weld County. Thornton has begun outreach to each irrigation ditch company to begin coordination activities. See Appendix B for additional information on stakeholder outreach. As part of the negotiation process for acquiring easements, Thornton's land agents coordinate with property owners on lateral ditch crossings to limit impacts to agricultural operations. Thornton will obtain appropriate agreements for each crossing before construction. No direct effects on water flow, TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-35 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION quantity, quality, or timing in the irrigation ditches are anticipated. Crossings will be constructed using either trenchless or open -cut methods as required by the irrigation ditch company and during times the ditch is not running, if required. The pump station sites are not located on land designated as prime agricultural. The water tank site is located on land designated as prime farmland. The land is adjacent to an existing water tank and is currently not being used for agricultural use. P.7. Explain whether this proposal interferes with the protection of the health, safety and welfare of the inhabitants of the neighborhood. Environmental Hazards Thornton and the TWP contractors will provide and maintain sanitary accommodations for the use of their employees during construction of the TWP in a manner that complies with the requirements and regulations of health departments and other governmental bodies. These accommodations, including trash dumpsters and portable toilets, will be located in several locations along the TWP alignment based on the general plan for construction. TWP contractors will be responsible for supplying and maintaining portable toilets. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws and regulations and that they screen portable toilets from the general public. Construction waste will be stockpiled in construction staging areas and removed from the construction site during the construction process. Trash dumpsters will be emptied approximately every 1 to 2 weeks. The TWP will not include the need for permanent dumpsters or sanitary facilities for domestic purposes as the water tank, pump stations, and underground water pipeline will be unmanned. Construction activities will follow best management practices for the management of wastes to avoid and minimize impacts from potential spills or other releases to the environment. These practices discussed in greater detail below will protect the health, safety and welfare of the inhabitants of the neighborhood. Hazardous Materials and Waste Management Mitigation Measures Construction, operation, and maintenance activities involving Thornton or the TWP contractors bringing any hazardous materials onto the site will comply with applicable federal, state, and local laws and regulations regarding the handling, storage, disposal, transportation, and use of hazardous substances. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws. If trenching activities uncover previously unknown areas of contamination that are apparent, work will be stopped until the party responsible for such contamination has properly managed and/or disposed of such contamination. Construction staging areas will be located and arranged in a manner to preserve trees and vegetation to the extent feasible. Excavated material or other construction materials will not be stockpiled or deposited near or on stream banks or other watercourse perimeters where they could be washed away by high water or storm runoff, or could encroach upon stream banks. Best management practices (BMPs) will be implemented for stormwater management. A summary of BMPs to protect water resources from potential contamination is provided in Appendix C. These practices will protect the health, safety and welfare of the inhabitants of the neighborhood. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-36 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Fueling Mitigation and Safety Measures TWP Construction If possible, fueling requirements will be met before arrival at the construction site. Heavy equipment left on site for construction activities will require onsite fueling at staging areas or the construction site. No bulk fuel storage is anticipated to occur on site. Fueling vehicles will be equipped with spill kits and fire extinguishers, and personnel will be properly trained in spill prevention, control, and countermeasures. To minimize the potential for a spill during fuel transfers and be prepared in the event of a spill, the following measures, as provided in the Code of Colorado Regulations [CCR] and Code of Federal Regulations [CFR], will be followed during loading/unloading of fuel: + Keep fire away while loading/unloading. Persons in the vicinity are forbidden to smoke, light matches, or carry any flame or lighted cigar, pipe, or cigarette. 49CFR 177.834(c, d). • Fuel will not be loaded/unloaded from any motor vehicle while the engine is running. The exception is when the engine of the vehicle is to be used in the operation of the pump. 49CFR 177.837(a). • The fuel tank records will be reviewed to determine the theoretical fuel tank level. 7CCR 1101- 14 52-3-1 and 52-4-2(a)(2.) • The fuel tank level gauge will be inspected to determine the actual fuel tank level before unloading takes place. (Note: Any fuel tank level discrepancies will be resolved before hooking up to the fuel tank.) 7CCR 1101-14 52-3-1 & 52-4-2(a)(2). • The supply truck driver will observe the transfer during the entire operation. 49CFR 177.834(i)(2). + Once the truck is in position, its emergency brake will be applied and reasonable precautions will be taken to prevent motion of the truck during unloading (example: utilize wheel chocks when parked on an incline). 49CFR 177.834(e). • Signs must be posted that remind drivers not to pull away before detaching hoses. 40CFR 112.7(h)(3). + Containers and cargo tanks will be grounded before and during transfer. 49CFR 177.837(b) & (c). • The transfer line must be properly disengaged, and the valves and piping of both the fuel tank and truck must be checked for leaks before allowing the truck to leave the site. (40CFR 112.7 h(4) for trucks). TWP Post -construction If feasible, backup power for the pump stations will be provided by a second feed from the applicable utility provider. Should a second feed not be available, or require significant improvements to the utility grid, backup diesel generators will be installed at both pump stations. The amount of fuel stored will be that required for 36 hours of operation at full load. At Pump Station 1, three 2 -megawatt (MW) diesel generators with approximately 4,150 -gallon underbelly tanks will be installed, if required. In this arrangement, approximately 12,500 gallons of diesel fuel will be stored onsite. At Pump Station 2, three 2 -MW diesel generators with approximately 4,150 -gallon underbelly tanks will be installed, if required. In this arrangement, approximately 12,500 gallons of diesel fuel will be stored onsite. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-37 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION The following measures will be followed for installation and operation of diesel fuel storage installed as part of any emergency generators included with the pump stations: • Location of fuel tanks will comply with required separation distances. 7CCR 1101-14 S3-2-2-4 + Application for Permit for Above Ground Storage Tank (AST) will be submitted and obtained for installation of diesel fuel storage tanks. 7CCR S3-2-3 + Spill and overfill protection will be provided during operation, including secondary containment equal to or greater than the volume of diesel fuel being stored. 7CCR 1101-14 S3-3-1 • Release detection will be provided. 7CCR 1101-14 S3-3-3 + Testing and compliance inspections will be completed per applicable code(s). 7CCR 53-3-4. These practices will protect the health, safety and welfare of the inhabitants of the neighborhood. Traffic and Roads and Mitigation Measures Impacts caused by construction equipment and activity on Weld County roads will be short term during construction. Access will be maintained for local area residents. Emergency vehicle access needs will be maintained and construction activities coordinated with local fire departments, police departments, ambulance services, and other emergency responders as necessary. Thornton places a high priority on safety during construction. Thornton will coordinate with local school districts regarding construction and haul routes and school bus traffic. TWP contractors will implement traffic management plans based upon local traffic control requirements and general safe operating practices. Proper signage, flaggers, lighting, speed limits, work hours, postings, notifications, and other precautionary safety measures will be taken to protect the residents of Weld County and the TWP contractors' employees. The water pipeline construction will utilize trenchless construction methods under Weld County roads where required by Weld County, resulting in little to no disruption to traffic at those locations. Temporary traffic delays and detours will be needed where the water pipeline is installed by open - cut construction across existing roads. Traffic disruption will be temporary, and will cease after construction. Traffic control plans will be implemented before construction, subject to approval and acquisition of permits from Weld County Engineering. If open -cut construction is approved by Weld County at road crossings, Table 4.2 presents the number of anticipated days to construct the water pipeline and restore ROW for various road functional classifications. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-38 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 4.2 Anticipated Water Pipeline Construction and Restoration Times for Open -cut Method for Road Crossings Road Classification ROW Road Surface Anticipated Anticipated Anticipated Length Closure Number of Days Number of Days for Water Pipeline for ROW Installation Restoration Local Local Collector Collector Arterial 60 Gravel Full 60 Paved Full 80 Gravel Partial 80 Paved Partial 140 Paved Partial 2 2 2 2 3 2 2 2 3 3 Additional information and mitigation measures are presented in Section 17, Traffic Narrative. These practices will protect the health, safety and welfare of the inhabitants of the neighborhood. Operations One of the greatest risks to buried pipelines is excavation by individuals unaware of the location of a pipeline. Pipeline markers will be installed in the pipeline permanent easement to indicate that a water pipeline is buried nearby. The markers will identify the water pipeline, Thornton as the pipeline operator, the operator's 24 -hour emergency contact number, and the area's utility notification number. Marking tape indicating that a water pipeline is buried in the location will also be installed above the water pipeline for the entire length of the water pipeline. The majority of the water pipeline in unincorporated Weld County will be located within permanent easements. This approach reduces the probability that individuals could damage the water pipeline with ground - disturbing activities. The water pipeline will be designed and constructed to be water tight. Pipe materials will be required to undergo shop testing before installation as well as hydrostatic field testing after installation. The water pipeline and appurtenances will be coated and lined to prevent corrosion. As an additional safety measure, project components will be installed with cathodic protection, which will control the corrosion of a metal surface. Cathodic protection systems are commonly used to protect metallic water pipelines. These practices will protect the health, safety and welfare of the inhabitants of the neighborhood. Environmental Health Questions This section addresses USR Questionnaire, Environmental Health Questions and the Procedural Guide Checklist, Evidence of Adequate Water Supply and Evidence of Adequate Sewage Disposal and the criteria described in WCC Sections 23-2-480 A.4 and 23-2-490 D. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-39 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION EH.1. What is the drinking water source on the property? If utilizing a drinking water well include either the well permit or well permit application that was submitted to the State - Division of Water Resources. If utilizing a public water tap include a letter from the Water District, a tap or meter number, or a copy of the water bill. TWP Construction During construction, water may be purchased from local water providers for construction activities such as watering a construction site to mitigate fugitive dust, soil conditioning to obtain the required backfill compaction, hydrostatic testing, and revegetation. TWP contractor will provide bottled water, water cooler service, or other temporary sources of drinking water during construction. Temporary water sources could include nearby fire hydrants or water pipelines. Thornton and/or TWP contractors will negotiate purchase of water deliveries from municipal and/or private sources. TWP Post -construction The TWP will not include the need for a permanent water supply for domestic purposes as the water tank, pump stations, and underground water pipeline will be unmanned. EH.2. What type of sewage disposal system is on the property? If utilizing an existing septic system provide the septic permit number. If there is no septic permit due to the age of the existing septic system, apply for a septic permit through the Department of Public Health and Environment prior to submitting this application. If a new septic system will be installed please state "a new septic system is proposed". Only propose portable toilets if the use is consistent with the Department of Public Health and Environment's portable toilet policy. TWP Construction Thornton and the TWP contractors will provide and maintain sanitary accommodations for the use of their employees during construction of the TWP in a manner that complies with the requirements and regulations of health departments and other governmental bodies. These accommodations, including trash dumpsters and portable toilets, will be located in several locations along the TWP alignment based on the general plan for construction. TWP contractors will be responsible for supplying and maintaining portable toilets. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws and regulations and that they screen portable toilets from the general public. TWP Post -construction The TWP will not include the need for permanent sanitary facilities for domestic purposes as the water tank, pump stations, and underground water pipeline will be unmanned. EH.3 If storage or warehousing is proposed, what type of items will be stored? TWP Construction At this time, Thornton anticipates using 13 temporary staging areas within unincorporated Weld County during construction of the TWP. Preliminary anticipated staging locations in unincorporated Weld County are shown on Figure 4.11a, Figure 4.11b, and the USR Maps. TWP contractors will determine final areas needed for staging. Each staging area is anticipated to occupy not more than 1 acre of land. Staging areas will be used for water pipe and appurtenances material storage, parking, equipment storage, field offices, and storage of excavated materials. Parking and vehicle storage TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-40 Thornton Water Project 40E CR ' et U a - JOHNS TOWN BERTHOUD CR 46 Thornton CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/22/2021 0 S 0.875 1.75 1 inch = 1.75 miles Miles TWP in Unincorporated Weld County TWP outside Unincorporated Weld County —• County Boundary Railroad River/Stream/Canal/Ditch Lake/Reservoir 1 1 Potential Staging Location Figure 4.11a Potential Staging Locations Sources U$GS NHD COWR Web County COOT Wt4709EE_THORNTON_NORTHERN_PROJECTtTASK_ORDER_5151_oERMI'TINGCISWAPFILESWJELD_USRIRESOURCE_MAPSPERMITAPP_202ftaOTENTIAL_ STAGING_ LOCATIONS M%D JOUAN 'r2b202t 11 05 2E AM VERMILLION RD Thornton Water Project cr• 6C T in WU-FRt.D RO , area. . . -' i .- 8_C WASATCH RD �O �+ : tr .J .O . I ;LONGMONT ss • 46; Av m • OXFORD RD NIwOOTT RD 0 0 CO KENOSHA RD N Z JASPER RD1 ''RY RD -Tetal s' 4 ARAPAHOE RD CRIB Thornton WA' IA PRC-:'.? CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON. CO 80241-2405 1/22/2021 1 0 S 0.875 1.75 1 inch = 1.75 miles Miles TWP in Unincorporated Weld County TWP outside Unincorporated nin Weld County —• County Boundary NIN n Railroad River/Stream/Canal/Ditch Lake/Reservoir Potential Staging Location Figure 4.11b Potential Staging Locations Sources. USGS, NHD. CDWR, Wcd County• CDOI W-WT8988 THORNTON NORTHERN PROJECTITASK ORDER 515.1 PERMITTWGIGISNMAPFILES%WE.LO USRIRESOURCE MAPS‘PERMITAPP 202t\POTENTIAL STAGING LOCATIONS.MXD iQUAN 1F221202'''O526AM THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION during construction will be primarily on property within the permanent or temporary easement, at temporary staging areas, or on property owned by Thornton. TWP Post -construction No permanent storage or warehousing is proposed for the TWP. EH. 4. Describe where and how storage and/or stockpile of wastes, chemicals, and/or petroleum will occur on this site. TWP Construction Construction activities involving Thornton or the TWP contractors bringing any chemical products onto the site will comply with applicable federal, state, and local laws and regulations regarding the handling, storage, disposal, transportation, and use of these substances. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws. The TWP will not store or stockpile petroleum. Thornton and the TWP contractors will provide and maintain including trash dumpsters located in several locations along the TWP alignment based on the general plan for construction. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws and. Construction waste will be stockpiled in construction staging areas and removed from the construction site during the construction process. Trash dumpsters will be emptied approximately every 1 to 2 weeks. TWP Post -construction No wastes, chemicals and/or petroleum are anticipated to be stored or stockpiled for the water pipeline, water tank or pump stations. Any waste generated at the TWP will be removed on a daily basis. EH.5 If there will be fuel storage on site indicate the gallons and the secondary containment. State the number of tanks and gallons per tank. TWP Construction If possible, fueling requirements will be met before arrival at the construction site. Heavy equipment left on site for construction activities will require onsite fueling at staging areas or the construction site. No bulk fuel storage is anticipated to occur on site. Fueling vehicles will be equipped with spill kits and fire extinguishers, and personnel will be properly trained in spill prevention, control, and countermeasures. To minimize the potential for a spill during fuel transfers and be prepared in the event of a spill, the following measures will be followed (including the CCR and CFR that will be followed during loading/unloading of fuel): + Keep fire away while loading/unloading. Persons in the vicinity are forbidden to smoke, light matches, or carry any flame or lighted cigar, pipe, or cigarette. 49CFR 177.834(c, d) • Fuel will not be loaded/unloaded from any motor vehicle while the engine is running. The exception is when the engine of the vehicle is to be used in the operation of the pump. 49CFR 177.837(a) • The fuel tank records will be reviewed to determine the theoretical fuel tank level. 7CCR 1101- 14 S2-3-1 and S2 -4-2(a)(2) TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-43 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • The fuel tank level gauge will be inspected to determine the actual fuel tank level before unloading takes place. (Note: Any fuel tank level discrepancies will be resolved before hooking up to the fuel tank.) 7CCR 1101-14 52-3-1 & 52-4-2(a)(2) • The supply truck driver will observe the transfer during the entire operation. 49CFR 177.834(i)(2) + Once the truck is in position, its emergency brake will be applied and reasonable precautions will be taken to prevent motion of the truck during unloading (example: utilize wheel chocks when parked on an incline). 49CFR 177.834(e) • Signs must be posted that remind drivers not to pull away before detaching hoses. 40CFR 112.7(h)(3) + Containers and cargo tanks will be grounded before and during transfer. 49CFR 177.837(b) & (c) • The transfer line must be properly disengaged, and the valves and piping of both the fuel tank and truck must be checked for leaks before allowing the truck to leave the site. (40CFR 112.7 h(4) for trucks) TWP Post -construction No fuel will be stored for the water pipeline and water tank. For the pump stations, if feasible, backup power for the pump stations will be provided by a second feed from the applicable utility provider. Should a second feed not be available, or require significant improvements to the utility grid, backup diesel generators will be installed at both pump stations. The amount of fuel stored will be that required for 36 hours of operation at full load. At Pump Station 1, three 2 -MW diesel generators with approximately 4,150 -gallon underbelly tanks will be installed, if required. In this arrangement, approximately 12,500 gallons of diesel fuel will be stored onsite. At Pump Station 2, three 2 -MW diesel generators with approximately 4,150 -gallon underbelly tanks will be installed, if required. In this arrangement, approximately 12,500 gallons of diesel fuel will be stored onsite. The following measures will be followed for installation and operation of diesel fuel storage installed as part of any emergency generators included with the pump stations: + Location of fuel tanks will comply with required separation distances. 7CCR 1101-14 S3-2-2-4 • Application for Permit for Above Ground Storage Tank (AST) will be submitted and obtained for installation of diesel fuel storage tanks. 7CCR 53-2-3 • Spill and overfill protection will be provided during operation, including secondary containment equal to or greater than the volume of diesel fuel being stored. 7CCR 1101-14 S3-3-1 + Release detection will be provided. 7CCR 1101-14 53-3-3 • Testing and compliance inspections will be completed per applicable code(s). 7CCR S3-3-4 EH.6. If there will be washing of vehicles or equipment on site indicate how the wash water will be contained. TWP Construction The washing of concrete delivery trucks will be in designated concrete washout areas that will be defined in the SWMP. Locations will be in staging areas or within the permanent and temporary TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-44 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION easements. Concrete wash water will not be allowed to be disposed of on site. Washout water will be required to evaporate before removal of concrete waste to an offsite facility. The TWP Water Pipeline contractors will be required to install appropriate BMPs, such as soil berms around fueling, cleaning and maintenance areas. TWP Post -construction No vehicles or exterior equipment will be washed on site post -construction. Wash down is anticipated to be limited to rinsing of dust and tracked dirt/mud from the pump station operating floors. Wash down water will be released to floor drains. Floor drain releases will be piped to the exterior of the pump stations. The water will either be released to the stormwater detention ponds on site, or daylighted to the surface to evaporate and/or percolate into the ground. Given the small volumes and flow rates of these releases, no discharge off site is anticipated, as water will percolate and/or evaporate faster than it is being produced. Either method of release would require a variance from applicable plumbing codes and a variance will be requested with the building permit as applicable. Variances for this type of discharge have been allowed in the past for locations where no sanitary sewer system is available, given the anticipated absence of harmful contaminants and low volumes/flow rates of release. Cleaning of equipment internal to the pump stations will be completed using small volumes of water (less than 5 gallons) and appropriate surface cleaners. Any water containing cleaning agents that cannot be discharged to the floor drains will be transported offsite for proper disposal. EH.7. If there will be floor drains indicate how the fluids will be contained. No floor drains will be installed with the water pipeline or water tank. Floor drains are anticipated to be installed in the pump stations to drain intermittent small volumes of water released from air release valves on the pump discharge headers and potentially periodic wash down water. The water released by air release valves is the raw water within the TWP system and is not anticipated to contain any harmful contaminants. Raw water from the TWP system would be used for wash down (rinsing of dust and tracked dirt/mud from pump stations operating floors), and releases to the floor drains would be the raw water plus small amounts of dust and debris from operation of the pump stations. These releases are not anticipated to contain any harmful contaminants. Air release valves will discharge small amounts of water in periodic drips. Wash down water is anticipated to release at approximately 5 gallons per minute, for a duration of about 20 minutes and a total volume of 100 gallons. Wash down would occur during periodic maintenance, about once a month. Floor drain releases will be piped to the exterior of the pump stations. The water will either be released to the stormwater detention ponds on site, or daylighted to the surface to evaporate and/or percolate into the ground. Given the small volumes and flow rates of these releases, no discharge off site is anticipated, as water will percolate and/or evaporate faster than it is being produced. Either method of release would require a variance from applicable plumbing codes and a variance will be requested with the building permit as applicable. Variances for this type of discharge have been allowed in the past for locations where no sanitary sewer system is available, given the anticipated absence of harmful contaminants and low volumes/flow rates of release. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-45 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION EH.$. Indicate if there will be any air emissions. (e.g. painting, oil storage, etc.) TWP Construction Colorado requires that fugitive dust emissions be controlled during construction. The amount of surface clearing required for construction will exceed 25 acres; therefore, Thornton and/or the TWP contractors will develop a fugitive dust control plan, submit an air pollution emissions notice, and obtain a permit from Colorado Department of Public Health and Environment (CDPHE) before construction activities in accordance with state air quality regulations. The TWP will be constructed under multiple packages and multiple permits will be obtained as required. Construction activities, such as vehicles driven over cleared ground, general disturbance to vegetated areas, or soil stockpiles susceptible to winds, can cause fugitive dust. During construction, dust control measures will be implemented. Examples of these mitigation measures that maybe used on the TWP include: • Speed limits for construction vehicles within the work area + Water application to disturbed areas, dirt access roads, and stockpiles • Erosion control techniques and best management practices • Revegetation of disturbed areas where appropriate following construction activities Water will be used as needed for dust suppression during construction. Water sources could be nearby fire hydrants, water pipelines, and water trucks. Water may be purchased from local water providers for construction activities. During construction painting activities are anticipated to occur. TWP contractors will be required to meet federal, state, and local requirements limiting emission of volatile organic compounds. TWP Post -construction Permanent facilities associated with the TWP will comply with air pollution control regulations. The water pipeline, buried appurtenances, and water tank will not have emission sources; therefore, will not require a Colorado Air Emissions Permit. An emergency backup diesel generator might be located outside at each of the pump stations for emergency backup power if a second electrical feed is not included. If a second electrical feed is feasible and cost-effective, emergency diesel powered backup generators will not be required. Thornton will continue to coordinate with PVREA and United Power to determine specific requirements for power service to the pump stations. Regular maintenance will be performed to ensure that the generator provides backup power throughout its service life. The proposed generator will comply with county, state, and federal air quality standards. If required by the state, a Colorado Air Emissions Permit will be obtained prior to system startup. EH.9. Provide a design and operations plan if applicable. (e.g. composting, landfills, etc.) A design and operations plan is not applicable. EH.10 Provide a nuisance management plan if applicable. (e.g. dairies, feedlots, etc.) Not applicable. On February 6, 2020, Weld County staff stated that a nuisance management plan is not applicable to the TWP. A summary of that discussion is included in section USR Procedural Guide Checklist. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-46 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Public Works Questions This section addresses USR Questionnaire, Public Works Questions, Procedural Guide Checklist, Traffic Narrative, and WCC Section 23-2-510 C.2.k and 23-2-510 C.2.l, and the criteria described in WCC Sections 23-2-480 A.8 and 23-2-490 H. PW.1 Include a traffic narrative with the information below. A traffic impact study may be required. Improvements to adjacent streets/roads may be necessary to provide adequate safe and efficient transportation to and from the site. An Improvements Agreement may be required. As discussed during the Pre -Application meetings with Weld County staff on May 27, 2016, August 25, 2016, January 17, 2019 and March 13, 2020. and as stated in Memorandum Pre -Application Meeting prior to submitting USR for water transmission pipeline (PRE20-0036; Case File, pre - application) provided by Weld County staff dated March 13, 2020, which is included in Section 13, and in a February 6, 2020 discussion with Weld County staff, a summary of that discussion is included in section USR Procedural Guide Checklist, a traffic study is not required. Rather a traffic narrative meets the USR permit application requirements. A traffic narrative is included in Section 17. PW.1.a The projected number of vehicle trips (average per day, maximum per day, peak hour data) to and from the site and the type of vehicles (passenger, semi -truck, etc.). TWP Design Activities Thornton and TWP contractors, including engineers, biologists, specialists, surveyors, and land agents will periodically visit the site for design related activities beginning in 2019 through 2021. Vehicle trips are expected to be primarily passenger vehicles, although other vehicles including truck mounted drill rigs and water trucks for geotechnical exploration and subsurface utility investigation vehicle may access the site. Trips will be conducted periodically depending on the design activity and are not expected to exceed 3 trips per day per vehicle for each design package. Activities will typically take place from S a.m. to 5 p.m. Monday through Friday. TWP Construction During the construction phase of the TWP, trip generation will be primarily related to construction activities, including delivery of materials and equipment, worker transport, and water pipeline and appurtenances installation. Types of construction vehicles accessing the construction area will likely include those presented in Table 4.3. TABLE 4.3 Anticipated Construction Vehicles Construction Phase Vehicle Preparing the TWP Easements for Construction Equipment Transport Truck Dump Truck Loader Track Excavator Motor Grader Crew Truck Service Truck Inspection Vehicle TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-47 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 4.3 Anticipated Construction Vehicles Construction Phase Vehicle Pipeline Trenching and Installation Backfilling Re-grading/Reseeding Pipe/Material Hauling Truck Equipment Transport Truck Pipe Installation Crew Truck Inspection Truck Concrete Truck Track Excavator Loader Dump Truck Welding Truck Water Truck Equipment Transport Truck Dump Truck Loader Track Excavator Crew Truck Inspection Truck Concrete Truck Water Truck Compaction Equipment Equipment Transport Truck Motor Grader Reclamation Vehicle Crew Truck Inspection Vehicle Water Truck Construction activities for TWP are proposed to begin in 2020 with operation of the TWP system scheduled to begin in 2025 after construction of all TWP packages is complete. Construction of each mile of water pipeline is expected to last between 4 and 10 weeks not including revegetation activities. Construction of the water tank is expected to last approximately 1 year, and construction of the pump stations is expected to last 2 years. Trip generation will vary according to the phase and location of construction. On average, five trips per day to the site are expected for each type of construction vehicle: pickup trucks, welding trucks, pipe/material hauling trucks, water trucks, and equipment transport trucks for each construction package. Construction work hours will typically be from 7 a.m. to 7 p.m. Monday through Saturday unless otherwise approved by Weld County. Construction may extend beyond these hours on an as - required and case -by -case basis. For example, some construction activities, such as hydrostatic testing, require 24/7 operation, and shift work may be required. Traffic is expected to peak when construction crews commute to and from work each day between 6:30 a.m. and 7 a.m. and between 7 p.m. and 7:30 p.m. in passenger vehicles. Construction of multiple water pipeline construction packages and trenchless pipeline packages may occur concurrently with crews of 10 to 25 workers each. At the peak of construction, approximately 80 to 100 workers could be required at multiple sites along the TWP. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-48 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TWP Post -construction After construction, the TWP facilities could operate year-round, 24 hours a day; however, the water pipeline and appurtenances, will be unmanned. It is anticipated that normal operations could include up to two TWP operators traveling in one pickup truck daily along the water pipeline route for a visual inspection and maintenance activities during the hours of 8 a.m. to 5 p.m. TWP operators are also anticipated to conduct up to one visit per day of the water tank and pump station locations to inspect security and operation of each facility. Typically, operation of the pump stations, including video monitoring of site security, will be conducted remotely from another Thornton -owned facility. Up to twice per year, it is anticipated that TWP operators will enter vault and manhole appurtenances to exercise valves and conduct routine maintenance of equipment. To the extent practicable, visual inspections will be from public roads to minimize impacts to property owners. In case of emergency, the operators may be on -site outside of the normal operating hours. Consequently, there will be minimal effects on the volume of traffic on local streets. These trips are expected to be spread throughout the workday and to not have an impact on the volume of traffic on local streets during peak hours. PW.1.b Describe how many roundtrips/day are expected for each vehicle type: Passenger Cars/Pickups, Tandem Trucks, Semi-Truck/Trailer/RV (Roundtrip = 1 trip in and 1 trip out of site) TWP Design Activities Thornton and TWP contractors, including engineers, biologists, specialists, surveyors, and land agents will periodically visit the site for design related activities beginning in 2019 through 2021. Vehicle trips are expected to be primarily passenger vehicles, although other vehicles including truck mounted drill rigs and water trucks for geotechnical exploration and subsurface utility investigation vehicle may access the site. Trips will be conducted periodically depending on the design activity and are not expected to exceed 3 trips per day per vehicle for each design package. TWP Construction During the construction phase of the TWP, trip generation will be primarily related to construction activities, including delivery of materials and equipment, worker transport, and water pipeline and appurtenances installation. Types of construction vehicles accessing the construction area will likely include those presented in Table 4.4. TABLE 4.4 Anticipated Construction Vehicles Construction Phase Vehicle Preparing the TWP Easements for Construction Pipeline Trenching and Installation Equipment Transport Truck Dump Truck Loader Track Excavator Motor Grader Crew Truck Service Truck Inspection Vehicle Pipe/Material Hauling Truck Equipment Transport Truck Pipe Installation Crew Truck Inspection Truck Concrete Truck Track Excavator Loader TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-49 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 4.4 Anticipated Construction Vehicles Construction Phase Vehicle Dump Truck Welding Truck Water Truck Backfilling Re-grading/Reseeding Equipment Transport Truck Dump Truck Loader Track Excavator Crew Truck Inspection Truck Concrete Truck Water Truck Compaction Equipment Equipment Transport Truck Motor Grader Reclamation Vehicle Crew Truck Inspection Vehicle Water Truck Construction activities for TWP are proposed to begin in 2020 with operation of the TWP system scheduled to begin in 2025 after construction of all TWP packages is complete. Construction of each mile of water pipeline is expected to last between 4 and 10 weeks not including revegetation activities. Construction of the water tank is expected to last approximately 1 year, and construction of the pump stations is expected to last 2 years. Trip generation will vary according to the phase and location of construction. On average, five trips per day to the site are expected for each type of construction vehicle: pickup trucks, welding trucks, pipe/material hauling trucks, water trucks, and equipment transport trucks for each construction package. Construction work hours will typically be from 7 a.m. to 7 p.m. Monday through Saturday unless otherwise approved by Weld County. Construction may extend beyond these hours on an as - required and case -by -case basis. For example, some construction activities, such as hydrostatic testing, require 24/7 operation, and shift work may be required. Traffic is expected to peak when construction crews commute to and from work each day between 6:30 a.m. and 7 a.m. and between 7 p.m. and 7:30 p.m. in passenger vehicles. Construction of multiple water pipeline construction packages and trench less pipeline packages may occur concurrently with crews of 10 to 25 workers each. At the peak of construction, approximately 80 to 100 workers could be required at multiple sites along the TWP. TWP Post -construction After construction, the TWP facilities could operate year-round, 24 hours a day; however, the water pipeline and appurtenances, will be unmanned. It is anticipated that normal operations could include up to two TWP operators traveling in one pickup truck daily along the water pipeline route for a visual inspection and maintenance activities during the hours of 8 a.m. to 5 p.m. TWP operators are also anticipated to conduct up to one visit per day of the water tank and pump station locations to inspect security and operation of each facility. Typically, operation of the pump stations, including video monitoring of site security, will be TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-50 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION conducted remotely from another Thornton -owned facility. Up to twice per year, it is anticipated that TWP operators will enter vault and manhole appurtenances to exercise valves and conduct routine maintenance of equipment. To the extent practicable, visual inspections will be from public roads to minimize impacts to property owners. In case of emergency, the operators may be on -site outside of the normal operating hours. Consequently, there will be minimal effects on the volume of traffic on local streets. PW.1.c Describe the expected travel routes for site traffic. TWP Construction Truck haul routes for material deliveries from off -site locations will be chosen to facilitate safe and expedient delivery while limiting traffic impacts. It is expected that the daily commuting route for construction workers would also follow the same roads as the truck haul routes to the construction site or temporary staging areas for parking. Anticipated delivery and commuting routes are shown in Figure 4.12a and Figure 4.12b. The major roads and highways within Weld County that could be utilized for delivery of construction materials and construction worker trips as part of construction operations are presented in Table 4.5. TABLE 4.5 Possible Construction Delivery and Commuting Routes County or Major Roads Colorado Highways Federal Highways County Road 2, County Road 9, County Road 10, County Road 13, County Road 15, County Road 17, County Road 18, County Road 19, County Road 20, County Road 24, County Road 26, County Road 28, County Road 32, County Road 34, County Road 36, County Road 38, County Road 40, County Road 42, County Road 44, County Road 48, County Road 50, County Road 52, County Road 54, County Road 56, County Road 68 /2, E Crossroads Boulevard, E Harmony Road, E Prospect Road, County Road 84, County Road 86, County Road 88, Larimer County Road 3, Larimer County Road 50, Larimer County Road 52 Colorado Highway 14, Colorado Highway 52, Colorado Highway 66, Colorado Highway 60, Colorado Highway 392 Interstate 25, Interstate 25 Northeast Frontage Road, US Highway 34 TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-51 Thornton Water Project N 1 Thornton CITY OF THORNTON COLORADO 12450 WASHINGTON ST U 0 •• See IIMIMMI• • • S 0.875 r a U S••INIIIMI�-. CR 48 JOHNS TOWN 1.75 Miles BERTHOUD -:R+6 TWP in Unincorporated a Weld County TWP outside Unincorporated "" Weld County -- County Boundary a • roire t a a �J -. 48507W� _ • y ..�.. Z '>_ 1- ----2.-eO 4 S Q 4 Railroad River/Stream/Canal/Ditch Lake/Reservoir ♦* Possible Haul Route 2 Figure 4.12a Possible Haul Routes THORNTON, CO 80241-2405 1/22/2021 1 inch = 1.75 miles Sources NI -40 CDwR Well County CDOT W u7e9ee_THORNTON_NORTHERN_PROJECTtTASK_ORDER_5%5 _PERM-'" %GC SNAPP[LEStWELD_t.SRtRESOURCE_MAPS\PERMITAPP_202TtPOSS!9LE_HAUL_ROUT ES MUD JOL,AN •?2/202' '053 39 AM Thornton Water Project (?Thornton CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON. CO 80241-2405 1/22/2021 0 s 0.875 1.75 1 inch = 1.75 miles Miles TWP in Unincorporated Weld County TWP outside Unincorporated Weld County -- County Boundary Railroad River/Stream/Canal/Ditch Lake/Reservoir ♦* Possible Haul Route Figure 4.12b Possible Haul Routes Sources NHO. GIMP - We a Cou^t't COOT W.W789118 THORNTON NORTHERN PROJECTITASK ORDER 515.1 PERMITTNGIGISWAPFILESm(LO USRIRESOURCE MAPS\PERMITAPP 20211POSSSLE HAUL ROUTESMXD JOUAN 1Q2/202t 1053.39 AM THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TWP Post -construction It is anticipated that normal operations could include up to two TWP operators traveling in one pickup truck daily along the water pipeline route for a visual inspection and maintenance activities during the hours of 8 a.m. to 5 p.m. TWP operators are also anticipated to conduct up to one visit per day of the water tank and pump station locations to inspect security and operation of each facility. Up to twice per year, it is anticipated that TWP operators will enter vault and manhole appurtenances to exercise valves and conduct routine maintenance of equipment. To the extent practicable, visual inspections will be from public roads to minimize impacts to property owners. Consequently, there will be minimal effects on the volume of traffic on local streets. Possible commuting routes are presented in Table 4.6. It is expected that post -construction haul routes would be similar to routes used during construction and that vehicles would primarily utilize Interstate 25, Interstate 25 Northeast Frontage Road US Highway 34, Colorado Highways 14, 52, 60, 66, and 392, and east/west county roads along the TWP. TABLE 4.6 Possible Post -construction Delivery and Commuting Routes County or Major Roads Colorado Highways Federal Highways County Road 2, County Road 9, County Road 10, County Road 13, County Road 15, County Road 17, County Road 18, County Road 19, County Road 20, County Road 24, County Road 26, County Road 28, County Road 32, County Road 34, County Road 36, County Road 38, County Road 40, County Road 42, County Road 44, County Road 48, County Road 50, County Road 52, County Road 54, County Road 56, County Road 681/2, E Crossroads Boulevard, E Harmony Road, E Prospect Road, County Road 84, County Road 86, County Road 88, Larimer County Road 3, Larimer County Road 50, Larimer County Road 52 Colorado Highway 14, Colorado Highway 52, Colorado Highway 66, Colorado Highway 60, Colorado Highway 392 Interstate 25, Interstate 25 Northeast Frontage Road, US Highway 34 PW.1.d Describe the travel distribution along the routes (e.g. 50% of traffic will come from the north, 20% from the south, 30% from the east, etc.) TWP Construction The travel distribution of travel routes for construction cannot be identified at this time. Travel distribution depends on the TWP contractors who will be selected during a bid process after design is complete. The TWP contractors will be responsible for providing materials for construction. The water pipeline is anticipated to be transported from out of state. Construction staff and other deliveries are anticipated to travel from the south from the Denver metropolitan area and from the north from Greeley or Fort Collins. TWP Post -construction Travel routes post -construction are anticipated to occur from the south from Thornton (95%). Maintenance vehicles may travel from the north for maintenance of the northern portion of the water pipeline or in the event of an emergency (5%). TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-54 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION PW.1.e. Describe the time of day that you expect the highest traffic volumes to and from the site. TWP Construction Construction work hours will be from 7 a.m. to 7 p.m. Monday through Saturday unless otherwise specified by Weld County. Construction may extend beyond these hours on an as -required and approved basis. Vehicle trips will occur on a varying time schedule throughout the construction work hours. Delivery of construction materials could occur anytime during construction work hours. Traffic is expected to peak when construction crews commute to and from work each day between 6:30 a.m. and 7 a.m. and between 7 p.m. and 7:30 p.m. in passenger vehicles. TWP Post -construction It is anticipated that normal operations could include up to two TWP operators traveling in one pickup truck daily along the water pipeline route for a visual inspection and maintenance activities during the hours of 8 a.m. to 5 p.m. TWP operators are also anticipated to conduct up to one visit per day of the water tank and pump station locations to inspect security and operation of each facility. Typically, operation of the pump stations, including video monitoring of site security, will be conducted remotely from another Thornton -owned facility. Up to twice per year, it is anticipated that TWP operators will enter vault and manhole appurtenances to exercise valves and conduct routine maintenance of equipment. To the extent practicable, visual inspections will be from public roads to minimize impacts to property owners. In case of emergency, the operators may be on -site outside of the normal operating hours. Consequently, there will be minimal effects on the volume of traffic on local streets. PW.2. Describe where the access to the site is planned. TWP Construction Access along the TWP route will be along roadways, at existing access locations when practicable and at new proposed locations. Possible existing and new proposed access locations for permanent and temporary use along the water pipeline alignment and at the water tank and pump station sites are identified on Figure 4.13a and Figure 4.13b. As discussed with Weld County Public Works staff, locations are subject to change based on TWP contractors' needs. Thornton will obtain individual Weld County, CDOT, and other municipal access permits for any necessary temporary and permanent access locations as applicable. If access is needed using private roads or drives, Thornton or the TWP contractors will negotiate use with owners. Stabilized construction entrances/exits will be installed, as necessary, to access locations with paved roads. Permanent access locations will be designed per Weld County and municipal standards based on location of access. Temporary access will be unpaved and used primarily for transport of materials and construction workers. Temporary and permanent access locations will be closed to the public. Temporary access locations could include warning signs, flaggers, and controlled access, as necessary. Additionally, gates or other approved barriers on temporary access roads may be utilized when construction workers are not present to control unauthorized access. Temporary access locations will be restored to pre - construction conditions upon the completion of construction. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-55 Thornton Water Project 441 CR10 ra- Thornton 44) CC' L.. - W 2 Sii CITY OF THORNTON COLORADO U s JOHNSTOWN BERTHOUD CR 46 TWP in Unincorporated Weld County TWP outside Unincorporated Weld County —• County Boundary M Railroad River/Stream/CanaUDitch Lake/Reservoir Existing Access Location New Access Location y > .ya.. W J\n. 2 R 1« Figure 4.13a Possible TWP Access Locations 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/19/2021 0 0.875 1.75 1 inch = 1.75 miles Miles Sources NHD GCY 9 via Cavils. COOT WW789U_THORNTON_NORTHERN_PROJECTITASK_ORDER_5t1_PERMITTiNGCISWAPFILES\WELD_USRIRESOURCE_MAPSIPERMITAPv 20211ACCESS_LOCATONSMXD JOUAN+/19002124132 PM Thornton Water Project •\ itt PRE BROOMFI EL 160TH AVE f Thorf1ton YrAttH PFOJECT CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241.2405 1/19/2021 0 S 0.875 1.75 1 inch = 1.75 miles Miles TWP in Unincorporated a Weld County TWP outside Unincorporated Weld County -- County Boundary Railroad River/Stream/Canal/Ditch Lake/Reservoir • Existing Access Location • New Access Location Figure 4.13b Possible TWP Access Locations Sources. NHD. CDWR. Wes Coumy, COO T W.147S9Be THORNTON NORTHERN PROJECTITASX ORDER 515.1 PERMITTING%GISLMAPFILES%WELO USR‘RESOURCE MAPSTPERMITAPP 2021 ACCESS LOCATIONS MXD IQUAN 1n9r2021 2 44 32 PM THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TWP Post -construction Permanent access locations have been negotiated with property owners as part of easement acquisition. Permanent access locations are shown on the USR Maps. Access to the water tank will be a new gravel access from County Road 13. Access to Pump Station 1 is from County Road 50 and an existing permitted access (APOG19-004 Kerr McGee Gathering LLC). Access to Pump Station 2 will be a new paved access from County Road 2. PW.3 Drainage Design: Design and construction of a detention pond as described in an approved Drainage Report is required unless the project falls under an exception to stormwater detention requirements per code. (See below.) Does your site qualify for an exception to stormwater detention? If so, describe in a drainage narrative the following: PW.3.a Which exception is being applied for? Include supporting documentation. PW.3.b Does the water flow onto the property from an offsite source? If so, from where? PW.3.c Describe where the water flows to as it leaves the property PW.3.d Describe the direction of flow across the property PW.3.e Describe the location of any irrigation facilities adjacent to or near the property. PW.3.f Describe any previous drainage problems with the property Water Pipeline and Associated Temporary Staging Areas and Water Tank The water pipeline and the water tank site are excepted from the stormwater detention requirements per WCC Section 8-11-40 I. The exceptions that apply are as follows: • Water pipeline: Exception 5 "Pipelines or transmission lines, excluding laydown yards, metering sites, substations, and any other above ground appurtenances." • Water tank site: Exception 9 "Non -Urbanizing areas where the total pre-existing and post development impervious area produces stormwater runoff of less than, or equal to, five (5) cfs for the 1 -hour, 100 -year, storm event. This exception shall be supported by calculations signed and stamped by a Colorado Licensed Professional Engineer." A drainage narrative for the water pipeline is provided in Section 16 and a drainage narrative for the water tank is provided in Volume 4. Narratives have been developed in accordance with WCC Section 8-11-40 i and USR Questionnaire, Public Works Question 3. If used by the TWP contractors and in accordance with Weld County staff recommended conditions of approval, drainage narratives for staging areas will be submitted before start of construction. PW.4 If your Site does not qualify for an exception, the following applies: PW.4.a A Drainage Report summarizing the detention pond design with construction drawings and maintenance plan shall be completed by a Colorado Licensed Professional Engineer and adhere to the drainage related sections of the Weld County Code. PW.4.b The drainage Report must include a certification of compliance, which can be found on the Public Works website, stamped and signed by the PE. PW.4.c See the attached Drainage Report Review Checklist. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-58 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Pump Stations Preliminary drainage reports for the pump stations are provided in Section 16 and have been developed in accordance with WCC Chapter 8, Article X! Storm Drainage Criteria and USR Questionnaire, Public Works Question 4. Building Questions This section addresses USR Questionnaire, Building Questions and WCC Section 23-2-510C.2.a. B.1 List the type, size (square footage), and number of existing and proposed structures. Show and label all existing and proposed structures on the USR drawing. Label the use of the building and the square footage. Buried Appurtenances Various buried raw water pipeline appurtenances and structures, including access manways, blow off assemblies (used to drain the pipeline), combination air release valve vaults (used to exhaust air when filling the water pipeline and admitting air during draining operations), and isolation valve vaults may be constructed throughout the water pipeline alignment. The number, location, size of structures, and interior components of manholes and vaults will be designed specifically for the TWP and could vary from the descriptions provided. Water Tank There are no existing structures located at the water tank site. The water tank site will have an approximate 5,500 square foot steel tank. Pump Stations There are no existing structures located at either pump station site. Pump Station 1 site will include up to a 10,000 square foot building with approximately 3,000 square feet for equipment pads outside the pump station and 6,000 square feet for emergency generators. Pump Station 2 site will include up to 15,000 square foot building, a 15,000 square foot forebay with approximately 3,000 square feet for equipment pads outside the pump station/forebay and 6,000 square feet for emergency generators. B.2 Explain how the existing structures will be used for this USR? No existing structures will be utilized in unincorporated Weld County for the water pipeline or its appurtenances. B.3 List the proposed use(s) of each structure. Buried Appurtenances Various buried raw water pipeline appurtenances and structures, including access manways, blow off assemblies (used to drain the pipeline), combination air release valve vaults (used to exhaust air when filling the water pipeline and admitting air during draining operations), and isolation valve vaults may be constructed throughout the water pipeline alignment. The number, location, size of structures, and interior components of manholes and vaults will be designed specifically for the TWP and could vary from the descriptions provided. Water Tank The water tank will store water for the TWP. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-59 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Pump Stations Pump Station 1 will pump TWP water at a rate of up to 40 million gallons per day. Pump Station 1 site will include up to a 10,000 square foot building that is anticipated to house 5 pumps. It will include approximately 3,000 square feet for equipment pads outside the pump station and 6,000 square feet for three 2,000 kW generators. Equipment outside the pump station is anticipated to include the generators, electrical transformers, and HVAC units. Pump Station 2 will pump TWP water at a rate of up to 40 million gallons per day. Pump Station 2 site will include up to 15,000 square foot building anticipated to house 10 pumps, It will include approximately 3,000 square feet for equipment pads outside the pump station/forebay and 6,000 square feet for three 2,000 kW generators. Equipment outside the pump station is anticipated to include the generators, electrical transformers, and HVAC units. The 15,000 square foot forebay structure is used to store water. It is needed at Pump Station 2 for operational stability. TWP USR SUPPLEMENT 2 SECTION 4 USR QUESTIONNAIRE 4-60 Section 5 List of Property Owners This section addresses Procedural Guide Checklist, property owners (surface estate) list and WCC Section 23-2-510 D. Table 5.1 provides a list of surface property owners within Weld County with names, addresses, and the corresponding parcel identification numbers assigned by the Weld County Assessor in accordance with Procedural Guide Checklist and WCC Section 23-2-510 D. Table 5.2 provides a list of surface property owners within Larimer County with names, addresses, and the corresponding parcel identification numbers assigned by the Larimer County Assessor. Although Thornton is providing this list of Larimer County property owners at the request of Weld County Planning staff, Thornton does not believe that WCC Section 23-2-510 D requires this information be provided for properties located outside of Weld County. The lists include properties within 150 feet on each side of the centerline of the alignment of the TWP and properties within 150 feet of the water tank and pump station sites. The lists are compiled from the records of the Weld County Assessor and Larimer County Assessor as applicable. Figures 5.1 through Figure 5.27 show the adjacent property owner notification area. An affidavit attesting to the accuracy of the mailing lists is included. TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-1 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION AFFIDAVIT OF INTEREST OWNERS SURFACE ESTATE i; the undersigned, certify that the attached list is a true and accurate list of the names, addresses, and corresponding Parcel identification Numbers assigned by the County Assessor of the owners of property (the surface estate) within one hundred fifty ('₹50) feet of the subject property(ies)_ This list was compiled from the records of the Weld County Assessor, or a person qualified to do the task, and shall be current as of a date no more than thirty (30) days prior to the date the application is submitted to the Department of Planning Services. Subject Property(ies): Located within one hundred fifty (150) feet of the Thornton Water Project €n unincorporated Weld County Si 'ature '' ) Date TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-2 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 5.1 List of Surrounding Property Owners within Weld County within 150 feet of the Centerline of the TWP Parcel Name Address City State Zip Code 055518000030 SPABS LLC 4100 E MISSISSIPPI AVE STE 500 GLENDALE CO 80246-3053 055519000016 SPABS LLC 4100 E MISSISSIPPI AVE STE 500 GLENDALE CO 80246-3053 055530000016 MACHIN HAROLD A 43474 COUNTY ROAD 13 FORT COLLINS CO 80524-9102 055530000020 SPABS LLC 4100 E MISSISSIPPI AVE STE 500 GLENDALE CO 80246-3053 055530300021 CAHILL M MARGARET LIVING TRUST 630 S 70TH ST OMAHA NE 68106-1014 055530300022 ARKO DAVID 6255 COUNTY ROAD 88 FORT COLLINS CO 80524-9119 055530300026 LIBERTY HILL FARMS LLC 6025 COUNTY ROAD 88 FORT COLLINS CO 80524-9119 055531000028 ROLLIN BERNARD E 2101 E COUNTY ROAD 30 FORT COLLINS CO 80525-9332 055531000029 NELSON J SCOTT 6498 COUNTY ROAD 88 FORT COLLINS CO 80524-9127 055531000041 FARRER PAUL E 42078 COUNTY ROAD 13 FORT COLLINS CO 80524-9103 055531000042 FARRER PAUL E 42078 COUNTY ROAD 13 FORT COLLINS CO 80524-9103 055531200052 KELLER CLAY B 42720 COUNTY ROAD 13 FORT COLLINS CO 80524-9103 055531200053 KELLER JAMIE 42720 COUNTY ROAD 13 FORT COLLINS CO 80524-9103 055531200054 RODGERS ALICE 6046 COUNTY ROAD 88 FORT COLLINS CO 80524-9127 055531300061 DENNEY RANDOLPH N 6501 COUNTY ROAD 86 FORT COLLINS CO 80524-9121 070506000009 SCHNEIDER MARGARET A 41632 COUNTY ROAD 13 FORT COLLINS CO 80524-9147 070506000047 SCHNEIDER EUGENE F FAMILY TRUST C/O DUNHAM TRUST CO 241 RIDGE ST STE 100 RENO NV 89501-2055 070506300043 H & M ENTERPRISES LLC PO BOX 270747 FORT COLLINS CO 80527-0747 070506300051 KERCHENFAUT KENNETH J 41490 COUNTY ROAD 13 FORT COLLINS CO 80524-9101 TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-3 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 5.1 List of Surrounding Property Owners within Weld County within 150 feet of the Centerline of the TWP Parcel Name Address City State Zip Code 070506300055 NORTH WELD CO WATER DISTRICT PO BOX 56 LUCERNE CO 80646-0056 070506300056 SIMMONS TED V 41494 COUNTY ROAD 13 FORT COLLINS CO 80524-9101 070506301004 TAFOYA MARK A JR 6156 PHEASANT CREST DR FORT COLLINS CO 80524-8767 070506301007 BROUGH TIMOTHY R 6135 PHEASANT CREST DR FORT COLLINS CO 80524-8766 070506301008 GROSSNICKLE MARK 6155 PHEASANT CREST DR FORT COLLINS CO 80524-8766 070506301009 BROUGH TIMOTHY R 6135 PHEASANT CREST DR FORT COLLINS CO 80524-8766 070507000046 THORNTON CITY OF 9500 CIVIC CENTER DR THORNTON CO 80229-4326 070507000047 GBP LLC PO BOX 1986 FORT COLLINS CO 80522-1986 070507200022 DECHAIRO ROGER 40898 COUNTY ROAD 13 FORT COLLINS CO 80524-9001 070507200023 DYECREST DAIRY LLC 1137 N COUNTY LINE RD FORT COLLINS CO 80524 070518200058 AGIG LLC 3282 ROCK PARK DR FORT COLLINS CO 80528-9488 070519000036 THORNTON CITY OF 9500 CIVIC CENTER DR THORNTON CO 80229-4326 070519200046 GARNER DONALD G 7951 W 28TH ST GREELEY CO 80634-9647 070519200053 BENEDICT PHILIP JEROME JR 38568 COUNTY ROAD 13 FORT COLLINS CO 80524-9008 080706100004 HILL ALDEN V 318 S GRANT AVE FORT COLLINS CO 80521-2537 080707000003 WESTWIND FARM LLC C/OAGNES R KOLDEWAY 6228 N COUNTY ROAD 13 LOVELAND CO 80538-1252 080707000042 SONDRUP FAMILY WEALTH TRUST 34310 COUNTY ROAD 13 WINDSOR CO 80550-2804 080707200002 STALEY FARM INVESTMENTS LLC 1927 WILMINGTON DR STE 101 FORT COLLINS CO 80528-6103 080707200003 STALEY FARM INVESTMENTS LLC 1927 WILMINGTON DR STE 101 FORT COLLINS CO 80528-6103 TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-4 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 5.1 List of Surrounding Property Owners within Weld County within 150 feet of the Centerline of the TWP Parcel Name Address City State Zip Code 080718000004 WESTWIND FARM LLC C/OAGNES R KOLDEWAY, MANAGER 6228 N COUNTY ROAD 13 LOVELAND CO 80538-1252 080718000057 REYNOLDS TIMOTHY M 33673 COUNTY ROAD 13 WINDSOR CO 80550-3000 080718200003 REILLY CHRISTOPHER B 6427 COUNTY ROAD 68 1/2 WINDSOR CO 80550-3014 080731345003 RAINDANCE DEVELOPMENT LLC 540 W MADISON ST STE 2500 CHICAGO IL 60661-2555 095706000033 FRANK THOMAS LIVING TRUST 6333 COUNTY ROAD 60 WINDSOR CO 80550-3405 095706200008 WINDSOR TOWN OF PO BOX 627 WINDSOR CO 80550-0627 095706200009 LIND LAND COMPANY INC 1625 PELICAN LAKES PT STE 201 WINDSOR CO 80550-6236 095706200041 WELD COUNTY 1150 O ST GREELEY CO 80631-9596 095706300037 LIND MARTIN 1625 PELICAN LAKES PT STE 201 WINDSOR CO 80550-6236 095706300038 LIND MARTIN 29486 COUNTY ROAD 13 WINDSOR CO 80550-3413 095707200043 WELD COUNTY 1150 O ST GREELEY CO 80631-9596 095707200044 ELMQUIST GARY R (1/6 INT) 1315 GRAYS PEAK DR LONGMONT CO 80504-3006 095707300002 ZEILER FARMS 5901 SACAJAWEA WAY LOVELAND CO 80537-9339 095718000008 MARTIN MARIETTA MATERIALS REAL ESTATE INVESTMENTS INC C/O BADEN TAX MNGMT P.O. BOX 8040 FT WAYNE IN 46898-8040 095718000999 KOENIG RESERVOIR NON ASSESSABLE 095718103021 MEUSCH ROBERT L 27647 HOPI TRL LOVELAND CO 80534-8280 095718103023 OPLINGER FAMILY TRUST C/O GARY L OPLINGER SUSAN L OPLINGER 27687 HOPI TRL JOHNSTOWN CO 80534-8280 TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-5 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 5.1 List of Surrounding Property Owners within Weld County within 150 feet of the Centerline of the TWP Parcel Name Address City State Zip Code 095718103024 COPPERSMITH SCOTT A 27701 HOPI TRL LOVELAND CO 80534-8233 095718103025 CASEY DONALD P 27727 HOPI TRL LOVELAND CO 80534-8233 095718103026 KUPEC ROYAL 27761 HOPI TRL LOVELAND CO 80534-8233 095718103027 STRAUB MARTIN P 27793 HOPI TRL LOVELAND CO 80534-8233 095718103028 COLLINS SHARON L 27811 HOPI TRL LOVELAND CO 80537-8292 095718103029 STREGE MICHAEL JAMES 27823 HOPI TRL LOVELAND CO 80534-8292 095718103033 REESE DANIELJAMES WAGERS 2154 NUCLA AVE LOVELAND CO 80538-6615 095718103034 INDIANHEAD WEST HOMEOWNERS ASSN PO BOX 7011 LOVEAND CO 80537-0011 095718109001 LYDON STEPHEN M 6501 ALGONQUIN DR LOVELAND CO 80534-8288 095718109003 LYDON SEAN M 6501 ALGONQUIN DR LOVELAND CO 80534-8288 095718200056 ANADARKO E&P ONSHORE LLC ATTN: TRAVIS HOLLAND-APC PROPERTY TAX PO BOX 173779 DENVER CO 80217-3779 095718200058 ANADARKO E&P ONSHORE LLC ATTN: TRAVIS HOLLAND-APC PROPERTY TAX PO BOX 173779 DENVER CO 80217-3779 095718300003 GERRARD INVESTMENTS LLC 27154 COUNTY ROAD 13 JOHNSTOWN CO 80534-8205 095718400054 FRIEDE CHERYL 6943 COUNTY ROAD 56 JOHNSTOWN CO 80534-8237 095719000051 ROSS DAVID M 6248 COUNTY ROAD 56 LOVELAND CO 80534-8238 095719000057 CUMMINGS JOHN L PO BOX 814 WINDSOR CO 80550-0814 095719100059 R H AMEN FARMS LLC 26547 COUNTY ROAD 15 JOHNSTOWN CO 80534-8222 095719100065 W3 LEGACY LLC PO BOX 1449 FORT MORGAN CO 80701-1449 TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-6 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 5.1 List of Surrounding Property Owners within Weld County within 150 feet of the Centerline of the TWP Parcel Name Address City State Zip Code 095719300061 COULSON EXCAVATING CO INC 3609 N COUNTY ROAD 13 LOVELAND CO 80538-2399 095719300063 PALLOTTO MICHAEL GENE 26500 COUNTY ROAD 13 JOHNSTOWN CO 80534-8234 095719400002 CROISSANT FAMILY FARM LLC 49316 COUNTY ROAD 83 BRIGGSDALE CO 80611-9319 095730000030 VETTER MARGARET L ET AL 612 CHARLOTTE ST JOHNSTOWN CO 80534-8614 095730000038 LOVELAND READY -MIX CONCRETE INC 644 NAMAQUA RD LOVELAND CO 80537-6648 095730000040 VETTER MARGARET L 612 CHARLOTTE ST JOHNSTOWN CO 80534-8614 095730000041 LOVELAND READY MIX INC PO BOX 299 LOVELAND CO 80539-0299 095730100004 CROISSANT FAMILY FARM LLC 49316 COUNTY ROAD 83 BRIGGSDALE CO 80611-9319 095730300044 DWD INVESTMENT GROUP LLC PO BOX 607 KIMBALL NE 69145-0607 095730301002 NORTHRUP MICHAEL C 6486 COUNTY ROAD 52 1/4 JOHNSTOWN CO 80534-9512 095730301003 HOWARD WAYNE 6480 COUNTY ROAD 52 1/4 JOHNSTOWN CO 80534-9512 095730400010 KAMMERZELL JACOB TRUST 2130 S SAINT PAUL ST DENVER CO 80210-4906 095730400011 KAMMERZELL JACOB TRUST 2130 S SAINT PAUL ST DENVER CO 80210-4906 095731000001 BETZ STEVEN M 6022 COUNTY ROAD 52 JOHNSTOWN CO 80534-8210 095731000003 WIND FRANK 8276 BLACKWOOD DR WINDSOR CO 80550-8019 095731100007 SAUER JOHN SR LLC 6681 COUNTY ROAD 50 JOHNSTOWN CO 80534-9501 095731200013 WIND FRANK 8276 BLACKWOOD DR WINDSOR CO 80550-8019 105906000005 JOHNSTOWN LLC 144 N MASON ST FORT COLLINS CO 80524-7104 105906000024 COLLINS MARGARET O PO BOX 490 JOHNSTOWN CO 80534-0490 TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-7 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 5.1 List of Surrounding Property Owners within Weld County within 150 feet of the Centerline of the TWP Parcel Name Address City State Zip Code 105906200012 KERR-MCGEE GATHERING LLC ATTN: APC PROPERTY TAX PO BOX 173779 DENVER CO 80217-3779 105917000010 WIND FRANK 8276 BLACKWOOD DR WINDSOR CO 80550-8019 105918000014 RIEDER EARNEST ALEXANDER 21045 COUNTY ROAD 15 JOHNSTOWN CO 80534-9109 105919000005 NYGREN FAMILY FARMS LLLP 417 SETTLER WAY JOHNSTOWN CO 80534-7819 105919000018 CHANDLER FARMS JOHNSTOWN LLC C/O JOHN T CHANDLER 7835 EAGLE RANCH RD FORT COLLINS CO 80528-8959 105919000022 CHANDLER FARMS JOHNSTOWN LLC C/O JOHN T CHANDLER 7835 EAGLE RANCH RD FORT COLLINS CO 80528-8959 105919000023 DAVIS SANDRA LEE PO BOX 9 JOHNSTOWN CO 80534-0009 105919000024 OLSON BROS LP C/O ROGER E OLSON PO BOX 86 JOHNSTOWN CO 80534-0086 105920000019 BINDER FAMILY FARMS LLC 9783 COUNTY ROAD 46 1/2 MILLIKEN CO 80543-9403 105920200004 FRANK TIMOTHY R 20700 COUNTY ROAD 15 JOHNSTOWN CO 80534-9218 105920200005 BROWN KELLY L PO BOX 817 JOHNSTOWN CO 80534-0817 105920200049 FRANK TIMOTHY R 20700 COUNTY ROAD 15 JOHNSTOWN CO 80534-9218 105929000008 WIENS ENTERPRISES LLC 1508 STILLWATER AVE CHEYENNE WY 82009-7319 105929000011 SULLIVAN JAMES J 7528 COUNTY ROAD 42 JOHNSTOWN CO 80534-9216 105929000015 KIRBY DELBERT ARTHUR 19822 COUNTY ROAD 15 JOHNSTOWN CO 80534-9220 105929000016 RF HOLDINGS LLC PO BOX 205 FORT LUPTON CO 80621-0205 105929000032 OLSON BROS LP C/O ROGER E OLSON PO BOX 86 JOHNSTOWN CO 80534-0086 TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-8 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 5.1 List of Surrounding Property Owners within Weld County within 150 feet of the Centerline of the TWP Parcel Name Address City State Zip Code 105929100034 NANDA DEVI LLC 32460 IVERNESS DRIVE EVERGREEN CO 80439 105929300033 OLSON BROS LP C/O ROGER E OLSON PO BOX 86 JOHNSTOWN CO 80534-0086 105929400001 JOHNSTOWN TOWN OF PO BOX 609 JOHNSTOWN CO 80534-0609 105929400002 REICHERT EDWARDS 895 N4TH ST JOHNSTOWN CO 80534-8857 105930000007 GARCIA JAYSON D 19943 COUNTY ROAD 15 JOHNSTOWN CO 80534-9219 105932000023 RTP LAND CO LLC 9842 HIGHWAY 52 FORT LUPTON CO 80621-8430 105932000024 WHITAKER BRIAN J 7571 COUNTY ROAD 38 JOHNSTOWN CO 80534-9223 105932000025 RTP LAND CO LLC 9842 HIGHWAY 52 FORT LUPTON CO 80621-8430 105932000028 HEPP DONALD 7444 COUNTY ROAD 40 JOHNSTOWN CO 80534-9209 105932300001 ROBERTS SHARON 1001 FAIRACRES LN MILLIKEN CO 80543-8495 105932300034 FRANK ROGER PO BOX A MILLIKEN CO 80543-0016 106101000014 MASSEY FARMS LLLP C/O WILLIAM K MASSEY 23570 E MORAINE PL AURORA CO 80016-7039 106101404028 JOHNSTOWN TOWN OF PO BOX 609 JOHNSTOWN CO 80534-7804 106101404033 TWIN SILOS LLC PO BOX 741165 ARVADA CO 80006-1165 120905000021 SCHLAGELJ ROBERT FAMILY TRUST C/O PHYLLIS SCHLAGEL 17138 COUNTY ROAD 17 PLATTEVILLE CO 80651-9405 120905000022 SCHLAGELJ ROBERT FAMILY TRUST C/O PHYLLIS I SCHLAGEL 17138 COUNTY ROAD 17 PLATTEVILLE CO 80651-9405 120905100013 KROES FAMILY REVOCABLE TRUST 8509 AVENUE 152 TIPTON CA 93272-9761 120905100015 KROES FAMILY REVOCABLE TRUST 8509 AVENUE 152 TIPTON CA 93272-9761 TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-9 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 5.1 List of Surrounding Property Owners within Weld County within 150 feet of the Centerline of the TWP Parcel Name Address City State Zip Code 120905100016 SCHLAGELJ ROBERT FAMILY TRUST C/O PHYLLIS SCHLAGEL 17138 COUNTY ROAD 17 PLATTEVILLE CO 80651-9405 120905300029 KROES FAMILY REVOCABLE TRUST SEPT 1704 8509 AVENUE 152 TIPTON CA 93272-9761 120905300030 KROES FAMILY REVOCABLE TRUST SEPT 1704 8509 AVENUE 152 TIPTON CA 93272-9761 120908000015 BERRY FARMS LLC C/O CHARLENE GARRETT, MNGR 2195 CHANTALA AVE PUEBLO CO 81006-1712 120908000016 BERRY FARMS LLC C/O CHARLENE GARRETT, MNGR 2195 CHANTALA AVE PUEBLO CO 81006-1712 120908000022 WELSH ANDREW 5946E CONSERVATION DR FREDERICK CO 80504-9650 120908300026 COX WAYNE L 16262 COUNTY ROAD 15 PLATTEVILLE CO 80651-9401 120908300027 WOOLERY GEORGE B 7465 COUNTY ROAD 34 PLATTEVILLE CO 80651-9412 120908300028 HARTNAGLE ROBERT JOHN 16164 COUNTY ROAD 15 PLATTEVILLE CO 80651-9401 120908400002 LABAU KAY T LIVING TRUST 2951 ADMIRALTY BAY DR ANCHORAGE AK 99515-2425 120917000009 ELLIOTT FAMILY FARM LLC 4850 W 103RD AVE WESTMINSTER CO 80031-2325 120917000010 SEKICH PROPERTIES LLC 6769 COUNTY ROAD 32 PLATTEVILLE CO 80651-9000 120917100013 HOUSTON BENNETT R 9053 COUNTY ROAD 34 PLATTEVILLE CO 80651-9218 120917100015 HOUSTON KIM Y 15649 COUNTY ROAD 17 PLATTEVILLE CO 80651-9424 120917100016 HOUSTON BENNETT R 9053 COUNTY ROAD 34 PLATTEVILLE CO 80651-9218 120917300018 SEKICH PROPERTIES LLC 6790 COUNTY ROAD 32 PLATTEVILLE CO 80651-9000 120919100068 SEKICH NICHOLAS 6769 COUNTY ROAD 32 PLATTEVILLE CO 80651-9000 120920000026 SALAZAR PAUL R 14542 COUNTY ROAD 17 PLATTEVILLE CO 80651-9101 TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-10 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 5.1 List of Surrounding Property Owners within Weld County within 150 feet of the Centerline of the TWP Parcel Name Address City State Zip Code 120920100041 DIXIE WATER LLC 400 POYDRAS ST STE 2100 NEW ORLEANS LA 70130-3282 120920100043 CNT FARMS LLC 9745 REMINGTON AVE FIRESTONE CO 80504-3541 120920100044 WAGNER CHRISTOPHER! 4738 COLORADO RIVER DR FIRESTONE CO 80504-5292 120920300032 SALAZAR PETEJR 7031 HIGHWAY 66 PLATTEVILLE CO 80651-9010 120920400038 DEPARTMENT OF TRANSPORTATION STATE OF COLORADO 2829 W HOWARD PL DENVER CO 80204-2305 120920400039 SALAZAR PETE 7031 HIGHWAY 66 PLATTEVILLE CO 80651-9010 120920400040 DEPARTMENT OF TRANSPORTATION STATE OF COLORADO 4201E ARKANSAS AVE DENVER CO 80222-3406 120921300018 DEPARTMENT OF TRANSPORTATION STATE OF COLORADO 2829 W HOWARD PL DENVER CO 80204-2305 120921300019 DIXIE WATER LLC 400 POYDRAS ST STE 2100 NEW ORLEANS LA 70130-3282 120928000002 VARRA COMPANIES INC 8120 GAGE ST FREDERICK CO 80516-9439 120928000006 READY MIXED CONCRETE COMPANY 5775 FRANKLIN ST DENVER CO 80216-1521 120928200017 FIRESTONE TOWN OF PO BOX 100 FIRESTONE CO 80520-0100 120929000033 VARRA COMPANIES INC 8120 GAGE ST FREDERICK CO 80516-9439 120929000047 FIRESTONE TOWN OF PO BOX 100 FIRESTONE CO 80520-0100 120929100052 VARRA COMPANIES INC 8120 GAGE ST FREDERICK CO 80516-9439 120929400051 COLLINS ROBERT ALLEN 13187 COUNTY ROAD 17 PLATTEVILLE CO 80651-9105 120932101003 VARRA PASQUALE 8120 GAGE ST FREDERICK CO 80516-9439 120932401002 VARRA PASQUALE 8120 GAGE ST FREDERICK CO 80516-9439 TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-11 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 5.1 List of Surrounding Property Owners within Weld County within 150 feet of the Centerline of the TWP Parcel Name Address City State Zip Code 120932401004 FIRESTONE TOWN OF PO BOX 100 FIRESTONE CO 80504-9000 120933000039 MC CLAY STEVEN JAMES 9173 COUNTY ROAD 26 FORT LUPTON CO 80621-9715 120933200051 VARRA COMPANIES INC 8120 GAGE ST FREDERICK CO 80516-9439 131104000073 HUFFAKER FAMILY TRUST 11096 COUNTY ROAD 17 LONGMONT CO 80504-5225 131104201005 BABCOCK LAND CORP 212 N WAHSATCH AVE STE 301 COLORADO SPRINGS CO 80903-3476 131104201007 BABCOCK LAND CORP 212 N WAHSATCH AVE STE 301 COLORADO SPRINGS CO 80903-3476 131104301008 BABCOCK LAND CORP 212 N WAHSATCH AVE STE 301 COLORADO SPRINGS CO 80903-3476 131105000036 2Z LLC 11298 COUNTY ROAD 17 LONGMONT CO 80504-9562 131105100007 HEIN RICHARD L 5290 E YALE CIR STE 103 DENVER CO 80222-6927 131108000051 OWEN CRAIG A TRUST 7751 COUNTY ROAD 22 LONGMONT CO 80504-9411 131108000052 RICHARDSON JEFFREY W 10879 COUNTY ROAD 17 LONGMONT CO 80504-9441 131108100056 SATER MARJORIE A PO BOX 17 FIRESTONE CO 80520-0017 131108100057 SATER FAMILY INTERESTS LP 7544 COUNTY ROAD 24 LONGMONT CO 80504-9548 131108400005 GRIEBEL CASEY L 1549 KIMBARKST LONGMONT CO 80501-2829 131108400007 WESTERVELT CAROLYN SUE 10371 COUNTY ROAD 17 LONGMONT CO 80504-9441 131108400010 YOUNG ROBERT R 10265 COUNTY ROAD 17 LONGMONT CO 80504-9441 131108400011 YOUNG ROBERT R 10265 COUNTY ROAD 17 LONGMONT CO 80504-9441 131108401001 ALDERMAN BRIAN) PO BOX 211 FIRESTONE CO 80520-0211 131108401027 PANORAMA ESTATES LLC 9075 COUNTY ROAD 10 FORT LUPTON CO 80621-8447 131109000001 MARTIN RUTH M 8592 COUNTY ROAD 24 FORT LUPTON CO 80621-9710 TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-12 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 5.1 List of Surrounding Property Owners within Weld County within 150 feet of the Centerline of the TWP Parcel Name Address City State Zip Code 131109000002 SPRAGUE MINDY 10732 COUNTY ROAD 17 LONGMONT CO 80504-9441 131109000003 WELD COUNTY VENTURE LLC 4755 LARIMER PKWY STE 200 JOHNSTOWN CO 80534-9021 131109000004 MARTIN DONALD L 8592 COUNTY ROAD 24 FORT LUPTON CO 80621-9710 131109000005 MARTIN DONALD L 8592 COUNTY ROAD 24 FORT LUPTON CO 80621-9710 131109000006 MARTIN RUTH M 8592 COUNTY ROAD 24 FORT LUPTON CO 80621-9710 131116000002 COLORADO STATE OF 1127 N SHERMAN ST STE 300 DENVER CO 80203-2398 131117000001 BROOKER TAD ALLEN 7974 COUNTY ROAD 22 LONGMONT CO 80504-9410 131117000006 SANDERS RAYMOND E 7911 COUNTY ROAD 20 LONGMONT CO 80504-9422 131117006001 FIRESTONE VENTURE LLC C/O DAN MARTIN 5749 VALLEY VISTA AVE FIRESTONE CO 80504-5852 131120000017 ANADARKO E&P ONSHORE LLC ATTN: TRAVIS HOLLAND-APC PROPERTY TAX PO BOX 173779 DENVER CO 80217-3779 131120400005 DIXIE WATER LLC 400 POYDRAS ST STE 2100 NEW ORLEANS LA 70130-3282 131120400034 DIXIE WATER LLC 400 POYDRAS ST STE 2100 NEW ORLEANS LA 70130-3282 131121000003 ANADARKO E&P ONSHORE LLC ATTN: TRAVIS HOLLAND-APC PROPERTY TAX PO BOX 173779 DENVER CO 80217-3779 131121000004 CARR PAULA R REVOCABLE LIVING TRUST (32.295% INT) 922 COLLYER ST LONGMONT CO 80501-4525 131128200005 WESTMORELAND JUSTIN L 7812 COUNTY ROAD 17 FORT LUPTON CO 80621-9039 131128200006 BASS ROBERT H 8076 COUNTY ROAD 18 FORT LUPTON CO 80621-9003 131128200010 TE VELDE MARVIN J FAMILY TRUST 7678 COUNTY ROAD 17 FORT LUPTON CO 80621-9039 TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-13 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 5.1 List of Surrounding Property Owners within Weld County within 150 feet of the Centerline of the TWP Parcel Name Address City State Zip Code 131128300051 TE VELDE MARVIN J & SANDRA MAE FAMILY TR 7678 COUNTY ROAD 17 FORT LUPTON CO 80621-9039 131128300055 WIMMER HANS 3318 BARBADOS PL BOULDER CO 80301-6063 131128300056 WIMMER HANS 3318 BARBADOS PL BOULDER CO 80301-6063 131129000011 CAMENISCH CHARITABLE REMAINDER C/O ROXIE M KOLDEWAY TRUSTEE 9842 HIGHWAY 52 FORT LUPTON CO 80621-8430 131129000031 MALLORY DAVID E 7543 COUNTY ROAD 16 FREDERICK CO 80530-9005 131132000032 SMITH BRETT R 7772 COUNTY ROAD 16 FREDERICK CO 80530-9008 131132000034 FARMERS RESERVOIR & IRRIGATION CO 80 S 27TH AVE BRIGHTON CO 80601-2699 131132400003 SAIS BURTON L 7923 COUNTY ROAD 14 FORT LUPTON CO 80621-9000 131133000007 PUBLIC SERVICE CO OF COLO TAX SERVICE DEPARTMENT PO BOX 1979 DENVER CO 80201-1979 131133200053 ATC WATERTOWN LLC PO BOX 723597 ATLANTA GA 31139-0597 131133200055 FIRESTONE TOWN OF PO BOX 100 FIRESTONE CO 80520-0100 131133200056 FIRESTONE TOWN OF PO BOX 100 FIRESTONE CO 80520-0100 131133200057 IHEARTMEDIA TOWER CO I LLC C/O JONATHAN HART 2800 POST OAK BLVD STE 3700 HOUSTON TX 77056-6170 131133318001 PUBLIC SERVICE COMPANY OF COLORADO TAX SERVICES DEPT PO BOX 1979 DENVER CO 80201-1979 131133319001 JOHNSON FARMS LLP C/O SUSAN TROUDT 16 SUNSET CIR LONGMONT CO 80501-4708 146904200007 DEPARTMENT OF HIGHWAYS STATE OF COLORADO 4201 E ARKANSAS AVE DENVER CO 80222-3406 146904200008 PHAM VINH Q 4540 W 105TH DR WESTMINSTER CO 80031-1972 TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-14 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 5.1 List of Surrounding Property Owners within Weld County within 150 feet of the Centerline of the TWP Parcel Name Address City State Zip Code 146904300003 DEPARTMENT OF TRANSPORTATION STATE OF COLORADO 4201E ARKANSAS AVE DENVER CO 80222-3406 146904300004 8316 LLC 5040 ACOMA ST DENVER CO 80216-2010 146905000017 JOHNSON FARMS LLP C/O SUSAN TROUDT 16 SUNSET CIR LONGMONT CO 80501-4708 146905100005 DEPARTMENT OF HIGHWAYS STATE OF COLORADO 4201 E ARKANSAS AVE DENVER CO 80222-3406 146905100011 COLUMBINE JERSEY FARMS INC 80 MISTLETOE RD GOLDEN CO 80401-9623 146908000017 NRC CO 1 LLC 755 E MULBERRY AVE 6TH FLR SAN ANTONIO TX 78212-3129 146909000003 NRC CO 1 LLC 755 E MULBERRY AVE 6TH FLR SAN ANTONIO TX 78212-3129 146916000001 MC FEE JOHN L JR ETAL C/O RONALD W MC FEE PO BOX 743 CHEYENNE WY 82003-0743 146916000087 LOR LEE 13980 HOLLY ST BRIGHTON CO 80602-7903 146916300022 AVALOS FERNANDO RETA 324 GLEN AYRE ST DACONO CO 80514-9540 146916300082 KLETZMAYER LIVING TRUST 3240 COUNTY ROAD 17 BRIGHTON CO 80603-8926 146916300083 ESKILDSEN SANDRA 3100 COUNTY ROAD 17 BRIGHTON CO 80603-8926 146916300089 KELLY COLLEEN M 3464 COUNTY ROAD 17 BRIGHTON CO 80603-8926 146916300090 LOPEZ-BARTOLO ADAM 3468 COUNTY ROAD 17 BRIGHTON CO 80603-8926 146917000025 UNDERHILL LAURA TRUST L C/O JOHN ROBERT UNDERHILL 2726 LUCKETTS LN RICHMOND TX 77406-1959 146917100045 FIRST UNITED HMONG ALLIANCE CHURCH OF 7300 ZUNI ST DENVER CO 80221-3165 146917100046 KLETZMAYER LIVING TRUST 3871 COUNTY ROAD 17 BRIGHTON CO 80603-8900 146917100047 KLETZMAYER LIVING TRUST 3871 COUNTY ROAD 17 BRIGHTON CO 80603-8900 TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-15 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 5.1 List of Surrounding Property Owners within Weld County within 150 feet of the Centerline of the TWP Parcel Name Address City State Zip Code 146917100052 KLETZMAYER LIVING TRUST 3871 COUNTY ROAD 17 BRIGHTON CO 80603-8900 146917100057 UNDERHILL LAURA L 8206 COUNTY ROAD 8 BRIGHTON CO 80603-8902 146917400039 DOLAN MATHEW C 3481 COUNTY ROAD 17 BRIGHTON CO 80603-8900 146917400040 UNDERHILL LAURA TRUST L C/O JOHN ROBERT UNDERHILL 2726 LUCKETTS LN RICHMOND TX 77406-1959 146917400041 UNDERHILL LAURA TRUST L C/O JOHN ROBERT UNDERHILL 2726 LUCKETTS LN RICHMOND TX 77406-1959 146920000018 GASPAR JOHN N 2603 COUNTY ROAD 17 BRIGHTON CO 80603-8922 146920000019 AUKER PATRICKS 2793 COUNTY ROAD 17 BRIGHTON CO 80603-8922 146920400009 CHA YINGTSE PO BOX 625 WESTMINSTER CO 80036-0625 146920400011 ROOS PROPERTIES LLC 3525 COLORADO BLVD DACONO CO 80514-8508 146921000006 ROAD 17 LLC 2624 COUNTY ROAD 17 BRIGHTON CO 80603-8921 146921000007 STEVENS ROBERT A 2464 COUNTY ROAD 17 BRIGHTON CO 80603-8921 146921000008 WARREN DELVIN G C/O WARRENS LANDSCAPE & SPRINKLER INC 847 LINGER DR PARKER AZ 85344-8135 146921000009 BORUM ROBERT 2198 COUNTY ROAD 17 BRIGHTON CO 80603-8910 146921000010 ESTERMAN LAURA 2164 COUNTY ROAD 17 BRIGHTON CO 80603-8910 146921000012 EL COLORADO VIEW LLC 2044 COUNTY ROAD 17 BRIGHTON CO 80603-8910 146921000013 POGGENSEE DENNIS L 2034 COUNTY ROAD 17 BRIGHTON CO 80603-8910 146921200016 OLSON RICHARD 2990 COUNTY ROAD 17 BRIGHTON CO 80603-8921 TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-16 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 5.1 List of Surrounding Property Owners within Weld County within 150 feet of the Centerline of the TWP Parcel Name Address City State Zip Code 146928000021 PUBLIC SERVICE CO OF COLO TAX SERVICE DEPARTMENT PO BOX 1979 DENVER CO 80201-1979 146928200002 D & C FARMS LLLP (5/12 INT) 8709 COUNTY ROAD 4 BRIGHTON CO 80603-8901 146929000046 SANDOVAL BOB R 1073 COUNTY ROAD 17 BRIGHTON CO 80603-8919 146929200040 ERN LTD PARTNERSHIP C/O ERNEST P ZARLENGO 2550 E FLORA PL DENVER CO 80210-6826 146929400001 SANDOVAL BOB R 1073 COUNTY ROAD 17 BRIGHTON CO 80603-8919 146929400002 SANDOVAL BOB R 1073 COUNTY ROAD 17 BRIGHTON CO 80603-8919 146929400003 D & C FARMS LLLP (5/12 INT) 8709 COUNTY ROAD 4 BRIGHTON CO 80603-8901 146932000014 HOWARD CRISTOPHER R 773 COUNTY ROAD 17 BRIGHTON CO 80603-8911 146932100001 HOWARD JOHN E 8679 COUNTY ROAD 4 BRIGHTON CO 80603-8901 146932100002 D & C FARMS LLLP (1/2 INT) 8709 COUNTY ROAD 4 BRIGHTON CO 80603-8901 146932400001 JACOBUCCI JOHN J (40% INT) C/O JOSEPH JACOBUCCI 483 COUNTY ROAD 17 BRIGHTON CO 80603-8924 146932400002 RUPERT LINDA ANN 423 COUNTY ROAD 17 BRIGHTON CO 80601-8924 146933000019 WYCOFF WILLIAM R 333 COUNTY ROAD 17 BRIGHTON CO 80603-8945 146933200001 SHELDON JENNIFER (99% INT) 716 COUNTY ROAD 17 BRIGHTON CO 80603-8908 146933200003 VAZQUEZ GILBERTO 626 COUNTY ROAD 17 BRIGHTON CO 80603-8936 146933200010 BARGEN JENNIFER M 848 COUNTY ROAD 17 BRIGHTON CO 80603-8908 146933200013 WELD FARM HOLDINGS LLC 905 W 124TH AVE STE 210 WESTMINSTER CO 80234-1716 146933200024 WHEELER 2014 REVOCABLE TRUST 526 COUNTY ROAD 17 BRIGHTON CO 80603-8944 TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-17 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 5.2 List of Surrounding Property Owners within Larimer County within 15D feet of the Centerline of the TWP Parcel Name Address City State Zip Code 8813000014 ROBINSON CHARLES/DEBRA 7040 E COUNTY ROAD 56 FORT COLLINS CO 80524-9340 8825006703 SPRADLEY KRISS E/JACLYN A REV TRUST 3453 N COUNTY ROAD 1 FORT COLLINS CO 80524-0000 8501105701 BINGER RICHARD G/PATRICIA A 9057 E CROSSROADS BLVD LOVELAND CO 80538-8955 8612000012 HOFF SP FAMILY TRUST 6405 S COUNTY ROAD 1 WINDSOR CO 80550 8825006702 ROWLAND DOLORES J ANTHONY T 3627 N COUNTY ROAD 1 FORT COLLINS CO 80524-0000 8613000901 CITY OF THORNTON 9500 CIVIC CENTER DR THORNTON CO 80229-4326 8613105002 7N LLC C/O EXTRACTION OIL AND GAS INC 370 17TH ST STE 5300 DENVER CO 80202-5653 8713106001 TEAL CREEK HOMEOWNER ASSOCIATION C/O TOM DOUGHERTY 220E MULBERRY ST FORT COLLINS CO 80524 8613105001 7N LLC C/O EXTRACTION OIL AND GAS INC 370 17TH ST STE 5300 DENVER CO 80202-5653 8501000001 HUANG JUN XIANG 3995 N COUNTY ROAD 1 LOVELAND CO 80538-8857 8512000005 HARMON BRIAN A MARGARET E 8985 GOLDEN FIELDS LN LOVELAND CO 80538 8501000018 NULL 3993 N COUNTY ROAD 1 LOVELAND CO 80538-8857 8501000015 EAGLEBERGER STEPHANIE 3051 N COUNTY ROAD 1 LOVELAND CO 80538 8612406002 HELZER JAMES R HELZER SANDRA HOY 6301 S COUNTY ROAD 13 WINDSOR CO 80550 8612406001 HELZER JAMES/SANDRA 6195 S COUNTY ROAD 1 FORT COLLINS CO 80524 8612000001 JOHNSON LARUE W/MARY E 3580 STANFORD RD #118 FORT COLLINS CO 80525 8501000012 EAGLEBERGER STEPHANIE 3051 N COUNTY ROAD 1 LOVELAND CO 80538 TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-18 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 5.2 List of Surrounding Property Owners within Larimer County within 15D feet of the Centerline of the TWP Parcel Name Address City State Zip Code 8501000013 BLAIR NICHOLAS M/HEIDI M 3379 N COUNTY ROAD 1 LOVELAND CO 80538 8501000014 FEYEN JOHN R/JUDITH A 3687 N COUNTY ROAD 1 LOVELAND CO 80538 8501000017 GEIST DONNA L/JAMES E 3685 N COUNTY ROAD 1 LOVELAND CO 80538 8501000016 STEPPEL MARY ELAINE PETER M 3381 N COUNTY ROAD 1 LOVELAND CO 80538-8857 8825005701 MASKE DANNY R 3333 N COUNTY ROAD 1 FORT COLLINS CO 80524-0000 8724000030 HALLEY LESLEY Y 1965 S COUNTY ROAD 1 FORT COLLINS CO 80524 8601435903 TIMNATH RANCH METRO DISTRICT NO 1 C/O PINNACLE CONSULTING GROUP INC 550 W EISENHOWER BLVD LOVELAND CO 80537-3106 8824000025 THIESZEN MILFORD E/SALLY 6959 SUNWATER WAY FORT COLLINS CO 80524-0000 8824000026 WELSH THOMAS P 5550 S COUNTY ROAD 7 FORT COLLINS CO 805289-507 8712000002 BOHEMIAN REAL ESTATE IV LLC 262 E MOUNTAIN AVE FORT COLLINS CO 80524-2821 8712005001 DYECREST DAIRY LLC 1137 N COUNTY ROAD 1 FORT COLLINS CO 80524-9312 8712000001 DYECREST DAIRY LLC 1137 N COUNTY ROAD 1 FORT COLLINS CO 80524-9312 8824000016 BAILEY KATHLEEN 934 E RIDGECREST RD FORT COLLINS CO 80524 8512400002 NORTH TIMNATH PROPERTIES LLC 308 COMMERCE DR UNIT A FORT COLLINS CO 80524 8824000014 KIDDER MARILYN R TRUST 1430 WINCANTON DR DEERFIELD IL 60015 TWP USR SUPPLEMENT 2 SECTION 5 LIST OF PROPERTY OWNERS 5-n Thornton Water Project J • ►' Thornton LR PROJECT CITY OF THORNTON COLORADO CR 56 a• *, CR 54 w , t , • - or; l• • S 'I .• •F N Notification Area 50ft Easement Boundary Railroad Lake/Reservoir River/Stream/Canal/Ditch Figure 5.1 Adjacent Property Owner Notification Area 12450 WASHINGTON ST THORNTON CO 80241 2405 1/22/2021 0 250 500 Feet 1 inch = 500 feet Sources NHp, USGS CUWR Wed County- CDC' ')RC. A 471411'HORN7ON NORTHE RN_ PROJECTTASK_ OROERSAS I_PERMRTtlO1WSUA'• .i SUNt..JSRNESOuRCE MAPSWERMITA/P 707r*AOJACENT PROPERTV_OWNERS_NOTIFCATION ARFA VAPSOOK MK0 JQJAN 'i N707"10457 Py Thornton Water Project ((4j Thornton CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241 2405 0 250 500 Feet Q Notification Area 50ft Easement Boundary Railroad Lake/Reservoir River/Stream/Canal/Ditch Figure 5.2 Adjacent Property Owner Notification Area 1/22/2021 1 inch = 500 feet Sources WHO USGS, COWR. Were Cd.r•ry_ COOT, DRCOi or vl MMl_ I t1ORN TON NOR 1111 RN_PROJ IC 11UASK OROI R_MS1_ PI RMII I INGISMMAPf II I SNN11O_USRRI SOURCI MAPSWI RIO IAPP_70)11AOJACI N1_PROPF R fY OWNI RS_ NO IIf ICA110N_ARI A_MAPSOO11MIIO JQUAN 1/12/1O11 17 0$ S7 PS Thornton Water Project i in ry.utl 'All stet (4(4:Thornton Y CITY OF THORNTON COLORADO S Notification Area 0 50ft Easement Boundary Railroad Lake/Reservoir River/Stream/Canal/Ditch 3OOtl Figure 5.3 Adjacent Property Owner Notification Area 12450 WASHINGTON ST THORNTON. CO 80241 2405 1/22/2021 0 250 500 Feet 1 inch = 500 feet Sources NND USGS, COWR, Wet Ca,^ty, COOT. DRCOG W MIWl$I r*ONN ION_ NON I.n RN_ .NOJI CMA)S_ONU1 4 AS 1_P1 RMIl IINC.GrSWIAPI itf WWI IU_USINU SOul4CI ,MAPSWI NMI*PP _l03i AO.IACl NI}NtOPI RIY_OWNI H'• .1/40 ',A-. UN. 44: AMA.htUUt ML; ' RLlOT 1la SI PM Thornton Water Project AFB►, ,mtePai+ CITY OF THORNTON 12450 WASHINGTON ST THORNTON. CO 80241 2405 1/22/2021 COLORADO s (.k tti NW 250 500 Feet 1 inch = 500 feet DOtt ` Notification Area Corporate Boundary 50ft Easement Boundary Timnath Railroad Lake/Reservoir River/Stream/Canal/Ditch W 14 76Wa_I,.ORNION NOgIRE RN_WIO7f CIIIASII.04401 q„AS I_MI WNII IINGCISNIAMI II S%WI I U_UI NW' SOURG _NAPSWI RYU AMPjO711AOiAC I NI_MOP! RI V_OWNI R!_WO I.I A;AIJON,ARt A_MAMnWII WC) .OUAN t?N7071 '706 Si W TIMNATH Figure 5.4 Adjacent Property Owner Notification Area Thornton Water Project PROS_ PECT ST ca.W SGT TI WATER VIEW (:1 a(Thornton CITY OF THORNTON COLORADO S Notification Area Corporate Boundary 50ft Easement Boundary Timnath Railroad Lake/Reservoir River/Stream/Canal/Ditch Figure 5.5 Adjacent Property Owner Notification Area 12450 WASHINGTON ST THORNTON. CO 80241.2405 1/22/2021 0 250 1 inch = 500 feet 500 Feet Snurcec NNO t1SCS CnWR Welt Cana COOT URCQC W u/y�/ I HORN ION NOI1IIW RN_PQOlf CIIIASt OQ0t R %%S1_Pf RN111 WG1C.fSWA t t F S%WI 10_uS1t1itt SOUNC7 MAPSW* NMII NP 7C7TU10.ACI NI wWQPI NI'_OWNI NSN0TiI CA !Oh Mt! A_MAPBOO4 MR0 IQUAN IQ71M71 '70151w' Thornton Water Project TIMNATH :at o Perk 0 tlanti i I orrnrr.)I r Hou!dn Windsor Cretin �`` Thornton iy ER PROJECT rvan, CITY OF THORNTON COLORADO vrir �+rf �TRILBY�RD S Notification Area Corporate Boundary 509 Easement Boundary Timnath Railroad Windsor I Lake/Reservoir River/Stream/Canal/Ditch WINDSOR Figure 5.6 Adjacent Property Owner Notification Area 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/22/2021 0 250 500 Feet 1 inch = 500 feet Sotrce♦ N11D. USGS. C,UWR, Wen Cw-ty. CDOt, DRCOG W Went_ ''1ORN ION_NUNIIq RN_PROII {,r\IASII_OROf R_MSI 1'l RUII I INCWIISWUW it SUWII U_VIRWI%GURU MAPSWI 4M11 APP_1071U10JA(;INI✓ROPI NIy OWNIRS_NOIII.GA IiuN_ *141 A_VAPSOIM M60 JQUAN IRif7021 1706 SI PM Thornton Water Project OS Ro:DSBD 30_)tt tr.t PI Y.ttCM Thornton WATER PROJEL • CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON. CO 80241-2405 0 S 250 500 r, Feet Notification Area Corporate Boundary 50ft Easement Boundary Windsor Railroad Lake/Reservoir River/Stream/Canal/Ditch Figure 5.7 Adjacent Property Owner Notification Area 1/22/2021 1 inch = 500 feet Sources NND, USGS- CDWR Wed Gang, COOT DRCOG WN7gQ_t..OOIION_%OR91RN_VROJICI\IA)K_ORO(RAS 1_ N NU I tINC'GSM/AuSMW$ SOu4C! VAHwt WWrAVV ZOYVULACt M'_✓NOVi+Itv_OW10 RS_NOr,,CA'OON A41A_1SAV000[ 11IlO'QUAN'I7flOj' lOf S7 .w Thornton Water Project JOHNS TO WN WINDSOR ALGONQUIN DR ay.,,91,?" CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241 2405 0 S 250 500 Notification Area Corporate Boundary 50ft Easement Boundary Johnstown Railroad Windsor Lake/Reservoir River/Stream/Canal/Ditch Figure 5.8 Adjacent Property Owner Notification Area 1/22/2021 F 1 inch = 500 feet eet Sources NHQ. USGS. CDWR, Wee Col.^It[. COOT, DRCCR; W M 1St I IIORIIION_NOR IIII RN_PROII CIIIASI! OR0I R_SU I RI RMIIl GCISWAPI h I SW1 I 0 USRIRI SOURCI MAPSIPI RMIIAPV_ipt1IA0JAC( NI PROPI RIY OWNI RS.IC I II K.AI ION_Ah A_MAVOWK MID 1QUAN 122222221 1 201 57 1'11 Thornton Water Project '.xks Foil AA sky t oetwootl Et nut tint (r°5‘,..>"' Thornton AT LR PROJECT CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241 2405 0 S 250 500 Feet Notification Area 50ft Easement Boundary Railroad Lake/Reservoir River/Stream/Canal/Ditch \\\\\ sibt„ Figure 5.9 Adjacent Property Owner Notification Area 1/22/2021 1 inch = 500 feet Sources NHD USGS, COWR. Woo County. COOT DRCOG WI41SItt IjOMM I OM MOM Tiff 4M_PROj IC UJASA OROf R_SIS 1_P1 MYII 1SGICOSIMAP1 M f 51W I 0 USRWf SOURCE YAPSWt RYt IAPP_}eznA IACI Sul _PROPI Rtr OWNI R5_A_YAPFfOO[MZO 1QUAM 14y}@I 1104 Slogs Thornton Water Project ((4� Thornton CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241 2405 0 S 250 500 Feet Notification Area Q 50ft Easement Boundary Railroad Lake/Reservoir River/Stream/Canal/Ditch Figure 5.10 Adjacent Property Owner Notification Area 1/22/2021 1 inch = 500 feet 5«.a. RHO USGs. C0WR. Wee! COLrny COOL 0RCOG W WIUUS&.T HORN tOM_NOAIIIF RN_PROJI CII IAs*_OROt 4_ AS t_PF RWI t NCJGa wAVFitt.SW/Fta_uSRWt SOLACE JWIPS1W WITAVP_2O11AJOJACt Itt P4OPI R Ir 0WIII its _A1 l it q;A I Q JCAYAK tVW Qua 1RwI2@t 1101 S1 POI Thornton Water Project Intl 4 , I.s 0 Windsor III A nit 2nol Boutdrt Greeley U‘.4.41% JOHNS TO WN • -s. W • rn v -GOLDENVUE DR - - m Thornton Y/A'CR Pf-S,E(.' CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON. CO 80241-2405 0 S 250 500 Feet Notification Area Corporate Boundary 50h Easement Boundary Johnstown Railroad Lake/Reservoir River/Stream/Canal/Ditch Figure 5.11 Adjacent Property Owner Notification Area 1/22/2021 1 inch = 500 feet Snurrn NH❑ I15GS rnwa in rnunty rnnr narnr. W 4 711961_ I HORN ON_ NOR! ,if RN_vRO11 C'V ASKORUI 6_5%11_14 RMII TINLGISWA PI..1 S\WI l ) USMWF SOUMCI _MAPS\PI RMIIAPP.M1f LAO JAC I NI _ VMOPI RIV_OWNI RS NOW CAI ON-ARI A_MAPBOOK NC) 1QUAN 101,2021 1706 SI WI Thornton Water Project • CR 44--- 7'. r" S. 're l • p�21.' s,, 300tt 4 y.. a U fi lrptc: lint( , t., A sta Q ran% it nisi tier 0 Windsor ;kit OP Cretin Evans TALI to i • • CR4.' • f 6 n' JOHNS TOWN O� W GADWALL LN MUSCOVE (N CAMPBELL Pt z r Lams -4- 1/ a Thornton VAT_:1 CITY OF THORNTON COLORADO S Notification Area Corporate Boundary Q 50ft Easement Boundary Johnstown Railroad L ] Lake/Reservoir River/Stream/Canal/Ditch Figure 5.12 Adjacent Property Owner Notification Area 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/22/2021 0 250 500 to Feet 1 inch = 500 feet Sotrccs NRD_ USGS,CUWR Wec Co -ti COOT DRCOG WN/AS_lt.ORN1ON_NORIIII RNPNOII t:t%rAs*ONUt H_HSI_PI'MI 11NCW1]WAPI It ISM!IUUSIMISOUNCI MAP%WI RIWIAVV_lOjIWLACI NI_PROPIRtY OWNI 115_MOIIICAIIOICANt A2661,6006 1.160 1QUAN Ill MOP 1706 S1 "I Thornton Water Project Corporate Boundary Johnstown i�Thornton UR PRO.I£CT CITY OF THORNTON COLORADO S Notification Area 50ft Easement Boundary Railroad 1 Lake/Reservoir River/Stream/Canal/Ditch Figure 5.13 Adjacent Property Owner Notification Area 12450 WASHINGTON ST THORNTON. CO 80241-2405 1/22/2021 0 250 500 Feet 1 inch = 500 feet W •4Iptl_, IORMIOM NORnHt 4N_AtOif CIO Alt_ ORDI R_MS I "1 RAW !Jt&d IWAP��u SIW�-0d)WWI SOURC! _MAVsWf RIWIIWP_ Z07'UILACI MI ✓ROPI RIV_OWMI RD 4O1'1 ACAUpM_A.P A_MAPOOOk $ k) IQUAIIII/22/2O11 12 0151 PM Sources. NHD. USGS. CDWR. Wen Count% COOT. DRCOG Thornton Water Project LonOor H I,ul tier Thornton WATER PROJL: CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241 -2405 N S 0 250 500 Feet Notification Area 50ft Easement Boundary Railroad Lake/Reservoir River/Stream/Canal/Ditch Figure 5.14 Adjacent Property Owner Notification Area 1/22/2021 1 inch = 500 feet Sources. NHD. USGS, C0WR_ Wela Count. COOL DRCOG wu1St I BONN ION_ NON I III RN_PROJI C Ill ASK OROI N_MI IPf RMII I WIGiiIS1MAPf 'UMWI I a uSRtRI SOYNCI MAPSWI MIS I APP 20711AOJACI NT _PROP( RIV OWNt RS_MCMP CA tCN ARI A_MAVSOOK MKD IQUAMO2OO21 I I of Sr PM Thornton Water Project Clain Aidry 5wlerark Thornton eR PROJECT CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON. CO 80241.2405 0 S 250 500 a� Feet I Notification Area 50ft Easement Boundary Railroad Lake/Reservoir River/Stream/Canal/Ditch Figure 5.15 Adjacent Property Owner Notification Area 1/22/2021 1 inch = 500 feet Sol,rccs NHD. USGS CDWR Wet C«,nw_ COOT. ORCOG W NlM11_: nONNION_MOSItmR RN_PROIICI\tAsS_Og01 MMS tof RMII I ihiGiGiSsidAPI nt NSW I D USNWt SOUI4Ct _NIAPSPi NYtAPP- elitAD1AC1 Mf_WIOPI g1V_OWMI NS_NOI11 CATIOII Attl A_YAP:OUK MAO IQUAN IQJJ'JOJI IJ0S S7 PW Thornton Water Project Tokk Thornton 11 PROJECT CITY OF TH0RNTON COLORADO 12450 WASHINGTON ST THORNTON. CO 80241 2405 S 0 250 500 Ci Notification Area SOft Easement Boundary Railroad -j Lake/Reservoir River/Strea mlCana UDitch Figure 5.16 Adjacent Property Owner Notification Area 1/22/2021 F 1 inch = 500 feet eet Sources NHO USGS, COWR. Wen Cowry, COOT ORCOG W WSIUI I $ORNION NUR1111 RN_PROI IC IIIASA_OR0I N_SIS 1_of ONO IMI1C1SMIAPI qI NWI 1 U.uSRWf SOLING JAAPSWIRMIIA P 02IUNJAC I NI_MlOP1 R IV OWNI NO_NOIII CA I ION ARIA MAPeOOKMII0 1QUAN Meal 11 OS S7 011/ Thornton Water Project P.LAITTEVIELE Thornton La PROJECT CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON. CO 80241-2405 0 S 250 500 Feet J Notification Area Corporate Boundary SOft Easement Boundary Mead Railroad Platteville Lake/Reservoir River/Stream/Canal/Ditch Figure 5.17 Adjacent Property Owner Notification Area 1/22/2021 1 inch = 500 feet Smarm% SHn 11S(1S r_nwf7 Wn>n rn,ntw rnnr nornr. W MIMIC l'IORNION_NOMI,.IRN_VRO„CIS 1ASk_OROI it.S%S 1_W RMII IWGriSWA„I t SSWI I O_USWRISOURCI MA✓SWf RWI AYH tor %A0/1c• N' PROP 41v_OWN14S MU', C AI'ON AM A IAA:9OOk MX11 I QUA% 142707' t)0{ SI PM Thornton Water Project (0*- Thornton to WATER PROJE. CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON. CO 80241.2405 , istiwf , '157 0 ?:)C 500 Feet FIRESTONE I 1 h z Notification Area Corporate Boundary 50ft Easement Boundary Firestone Railroad Lake/Reservoir River/Stream/Canal/Ditch Figure 5.18 Adjacent Property Owner Notification Area 1/22/2021 1 inch = 500 feet W w719111 IuORN I ON_NONha RN_WOl1 CI'IAst_OROI 4,515•,Pf RMII IINGIGISMIAPI II ISWII I U_USRIRI SOURCI_MAPSWI RMIIAPP 1071UUIJACI NI_MORI 6i r_OWNI RS_N0111CAPION A W A_MAP9OOK MKO IQUAN 172N7071170i S7 PM Sources NHO. USGS, CDWR_ Wed Coiner. COOT, ORCOG Thornton Water Project FIRESTONE BD Et nul Ilet i qtr FIRESTONE (C-13.- Thornton lHATER PROJEC CITY OF THORNTON COLORADO S Notification Area Corporate Boundary 50ft Easement Boundary Firestone Railroad Lake/Reservoir River/Stream/Canal/Ditch Figure 5.19 Adjacent Property Owner Notification Area 12450 WASHINGTON ST THORNTON, CO 80241 2405 1/22/2021 0 250 500 Sri Feet 1 inch = 500 feet cla,... Mum ucnc rnwo w..1 r .... rrvir nornn W AMi 7.- uQ4N I ON _NOR RN�'ROII(ASR_04Inf R_Nfl q 1111111 NGG41MAPI n1 SMNI I O_USW/2I SOUR°_MAVSWF RNIAPP lCl1IAO2ACI NI_✓ IOPI R IV_OWIII R)_ ICII CCA'CN_ARI A WAPOOOK IOW IUUAI4 ,1771X12117 OS S7 WI Thornton Water Project FIRES TONE (('Thornton WATER PROJEI- CITY OF THORNTON COLORADO ‘Ar s �J Notification Area Corporate Boundary Q 50ft Easement Boundary Firestone Railroad iTh Lake/Reservoir River/Stream/Canal/Ditch Figure 5.20 Adjacent Property Owner Notification Area 12450 WASHINGTON ST THORNTON. CO 80241 2405 1/22/2021 0 250 500 Feet 1 inch = 500 feet Sources WHO, USGS, CUWR, Weld County, CDOT. DRCOG A'415MS_I NORM ION_NON I III RN_PROII C It1ASS_OROt R ASI Pt RMdd 1 INGGISWIAR N (S11N11 O USR*f SO WWI JPAAPSIPF RANI APP_70711AOJACt MI. PNOPI RI Y_OWNI RS..1110;11 111 CATI O AIU A_MADeOOR MRO AQUAS 1 07/7071 1 2 05 S7 PM Thornton Water Project FIRES TONE �`� Thornton 1� En CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON. CO 80241 2405 S 0 250 500 Feet Notification Area Corporate Boundary 50ft Easement Boundary Firestone Railroad Lake/Reservoir River/Stream/Canal/Ditch Figure 5.21 Adjacent Property Owner Notification Area 1/22/2021 1 inch = 500 feet Sources NHD USGS. CDWR. Wee Canty. COOT. DRCOG w OMNI_I IIORN ION_NOR(N_WIOJI Ct11ASIkORO1 R_ASI_PI RMII IINGICIYM1API nt ?WI I p_USRIRt SOURCI MAPSIPt RANI APP_70itU10L1CI N1_PROP/ RIY OWN/RS_NOtit CAIION_ARIAMAPNOOIt MRO1QUAM IRV17@t 17A S7 PY Thornton Water Project FREDERICK C Q �`� Thornton i1� WATER CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241 2405 S 0 250 500 Feet Notification Area Corporate Boundary 501t Easement Boundary Frederick Railroad Lake/Reservoir River/Stream/Canal/Ditch Figure 5.22 Adjacent Property Owner Notification Area 1/22/2021 1 inch = 500 feet Sources NNp_ USGS, COWR. Weo Counry. CDOT DRCOC', H sse_I 1gRN ION NON 1111 RN_PROJIC II/ASJI_ORO RSL 1_91 ROW I INGCSWAP1 II I S 1I0 USWWISOURCI _NAPSWI RMIIAPP_I0I1U1IL1CI NI _PROOF RIV_OWNI RS NOIN/CAI ION_ARIA NAPeOON MI(O JOUAN I QI/IDII 12 Of SI PM Thornton Water Project 1 ` Thornton CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241-2405 S 0 250 500 Feet �J Notification Area Q 501t Easement Boundary Railroad 7-1 Lake/Reservoir River/Stream/Canal/Ditch Corporate Boundary Dacono Frederick Figure 5.23 Adjacent Property Owner Notification Area 1/22/2021 1 inch = 500 feet Sources. NHD. USGS. CDWR. Wed County. CDOT. DRCOC: WMTISWt_IrpQN TON_ NON 44N_'WO11CIIIASS_OM01 M_S1S 1 W MMII IItGIGJMUIOI' 1 Sal I Du1MYtf SOUMC) MAHSWI OA Mils T0TIUICJACI NI ✓MOPI M)Y_OWNI MSK) '.-A NON Alt. ANAPBOOM MM0 IOUAN IT77/7O71 Il OS ST PM Thornton Water Project rik Thornton WATER PROJECT CITY OF THORNTON COLORADO S Notification Area 50ft Easement Boundary Railroad Lake/Reservoir River/Stream/Canal/Ditch Figure 5.24 Adjacent Property Owner Notification Area 12450 WASHINGTON ST THORNTON. CO 80241 2405 1/22/2021 0 250 500 Feet 1 inch 7A 500 feet Sources RHO_ USGS. C0WR_ Wen Courtr COOT, ORCOM, 04 w 1q 71_ I IIORN ION NOR 1111 RN_PROJI C IIIASR_OROI N_S1S 1_PE PONT TINGGISWAPI II [SWIM O_USRYtE SOURCE MAPSW7 RMIAPP_7071U1OJACFN1 PROPERTY OWN/ RS_NOI II ICAIIONJIR3 A_MAPSOOt NOW JQUAN 1/22/7071 I I 57 PM Thornton Water Project o cind,or Greeley !t I 4 del =1r ThTornton iY WATER CITY OF THORNTON COLORADO S 250 500 Feet Notification Area Corporate Boundary 50ft Easement Boundary Dacono Railroad Lake/Reservoir River/Stream/Canal/Ditch Figure 5.25 Adjacent Property Owner Notification Area 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/22/2021 0 1 inch = 500 feet Sources NNO. USGS. CDWR. Weld COUMV. COOT. ORCOG W'Al i IRORNION.NOR; RN_+MO.ICtOkSit ORUI R -/15l W Rein '$&(ISNAW it SWI I I) uSW4lI SOUNCI YAyfyf 4110I AyI jpj1MC.AC' NI, PROVI RIvOW NIN]-N CAI Oh AR, A.WAf7OOIl 4%D MOAN IRM02' TIE 5) +f11 Thornton Water Project , 3001t if Thornton CITY OF THORNTON COLORADO 12450 WASHINGTON Sr THORNTON, CO 80241 2405 S 0 250 500 tI Notification Area 50ft Easement Boundary Railroad I Lake/Reservoir River/Stream/Canal/Ditch Figure 5.26 Adjacent Property Owner Notification Area 1/22/2021 1 inch = 500 feet Feet Sources RHO. USGS. COWR. Wet Cowry. COOL DRCOG ws.lml_I.WRWtON_RURIIRRN_PROJICIIIASK_ORUt RSISI_Pt WAIT IINGIGISWAvf ilk StWII 0_USRWISOURCI ildAraWl RMIIAPP_70IIMO/ACI Yt_PWOVIRIV_OWWI RS_ NOIIIICAICNARF A_WAVBOOA NR0 IQUAN lilt/WI Miles Thornton Water Project n ((Th9!ntc CITY OFTHORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/22/2021 S 0 250 500 Feet 1 inch = 500 feet Notification Area 50ft Easement Boundary Railroad Lake/Reservoir River/Stream/Canal/Ditch Figure 5.27 Adjacent Property Owner Notification Area • • ._ n1 •AT 1: • W M7N1a r,IORNION_MoR111f RM_NRO/1 C111Ab*_UNU1 R_NS I PI WWI I MGIGINVAAI* it 1 D1WI i 1)_uSRWI SOURCI MAa %MM RMIIAPP 7071UU71ACI NT_PROPI RIV_OWMI RS_NOlil CAI'ON AR/ A_MAPBOOR MIIU )(WAN IQ1flW1 170{ S7 PM Section 6 Irrigation Ditch, Lateral, or Pipeline Owners This section addresses Procedural Guide Checklist, irrigation ditch, lateral, or pipeline owners list and WCC Section 23-2-510 E. Table 6.1 provides a list of names and addresses of owners of irrigation ditches or laterals that traverse the permanent easement or temporary construction easement for the water pipeline or water tank and pump station sites. The list includes ditch companies and property owners. If survey information indicated an unnamed ditch on private property with no documentation of easement, the name of the property owner is provided in the table. Table 6.2 provides a list of names and addresses of owners of pipelines that traverse the permanent easement or temporary construction easement for the water pipeline or water tank and pump station sites Information was obtained from title report review and preliminary survey information. TABLE 6.1 List of Owners of Irrigation Ditches or Laterals Traversing the TWP Easements or Appurtenant Facility Sites Owner Name Address City State Zip Code BIG DRY CREEK DITCH AND RESERVOIR COMPANY 2528 WELD COUNTY ROAD 19 FORT LUPTON CO 80621 NEW COAL RIDGE DITCH COMPANY 10879 CO RD 17 LONGMONT CO 80504 LUPTON BOTTOM DITCH COMPANY 11016 WELD COUNTY RD 23 FORT LUPTON CO 80621 LAST CHANCE DITCH AND RESERVOIR COMPANY 11955 WELD COUNTY RD. 15 LONGMONT CO 80504 FARMERS EXTENSION DITCH COMPANY P.O. BOX 159 JOHNSTOWN CO 80534 CONSOLIDATED HILLSBOROUGH DITCH COMPANY 612 CHARLOTTE STREET JOHNSTOWN CO 80534 HIGHLAND DITCH COMPANY 4309 STATE HIGHWAY 66 LONGMONT CO 80504 GREELEY-LOVELAND IRRIGATION COMPANY 808 23RD AVE GREELEY CO 80634 CACHE LA POUDRE RESERVOIR COMPANY PO BOX 104 LUCERNE CO 80646 LAKE CANAL RESERVOIR COMPANY 413329 WELD COUNTY ROAD EATON CO 80615 LARIMER & WELD IRRIGATION COMPANY 106 ELM AVENUE EATON CO 80615 WATER SUPPLY AND STORAGE COMPANY 2319 E MULBERRY ST FORT COLLINS CO 80524 NORTH POUDRE IRRIGATION COMPANY P.O. BOX 100 WELLINGTON CO 80549 YOXALL DITCH COMPANY 8679 WELD COUNTY ROAD 4 BRIGHTON CO 80603 TWP USR SUPPLEMENT 2 SECTION 6IRRIGATION DITCH, LATERAL, OR PIPELINE OWNERS 6-1 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 6.1 List of Owners of Irrigation Ditches or Laterals Traversing the TWP Easements or Appurtenant Facility Sites Owner Name Address City State Zip Code FARMERS RESERVOIR AND IRRIGATION COMPANY 80 SOUTH 27TH AVENUE BRIGHTON CO 80601 D & C FARMS LLLP (5/12 INT) 8709 COUNTY ROAD 4 BRIGHTON CO 80603-8901 ERN LTD PARTNERSHIP 2550 E FLORA PL DENVER CO 80210-6826 EL COLORADO VIEW LLC 2044 COUNTY ROAD 17 BRIGHTON CO 80603-8910 BORUM ROBERT 2198 COUNTY ROAD 17 BRIGHTON CO 80603-8910 CHA YINGTSE PO BOX 625 WESTMINSTER CO 80036-0625 GASPAR JOHN N 2603 COUNTY ROAD 17 BRIGHTON CO 80603-8922 ROAD 17 LLC 2624 COUNTY ROAD 17 BRIGHTON CO 80603-8921 OLSON RICHARD 2990 COUNTY ROAD 17 BRIGHTON CO 80603--8921 ESKILDSEN SANDRA 3100 COUNTY ROAD 17 BRIGHTON CO 8060-38926 UNDERHILL LAURA L 8206 COUNTY ROAD 8 BRIGHTON CO 80603-8902 MC FEE JOHN LJR ETAL PO BOX 743 CHEYENNE WY 82003-0743 NRC CO 1 LLC 755 E MULBERRY AVE 6TH FLR SAN ANTONIO TX 78212-3129 JOHNSON FARMS LLP 16 SUNSET CIR LONGMONT CO 80501-4708 PHAM VINH Q 4540 W 105TH DR WESTMINSTER CO 80031-1972 SMITH BRETT R 7772 COUNTY ROAD 16 FREDERICK CO 80530-9008 HUFFAKER FAMILY TRUST 11096 COUNTY ROAD 17 LONGMONT CO 80504-5225 VARRA COMPANIES INC 8120 GAGE ST FREDERICK CO 80516-9439 DIXIE WATER LLC 400 POYDRAS ST STE 2100 NEW ORLEANS LA 70130-3282 FREDON LLC 304 GRAND VIEW LN MEAD CO 80542-9006 SEKICH PROPERTIES LLC 6790 COUNTY ROAD 32 PLATTEVILLE CO 80651-9000 HOUSTON BENNETT R 9053 COUNTY ROAD 34 PLATTEVILLE CO 80651-9218 LABAU KAY T LIVING TRUST 2951 ADMIRALTY BAY DR ANCHORAGE AK 99515-2425 WELSH ANDREW 5946 E CONSERVATION DR FREDERICK CO 80504-9650 BERRY FARMS LLC 2195 CHANTALA AVE PUEBLO CO 81006-1712 SCHLAGELJ ROBERT FAMILY TRUST 17138 COUNTY ROAD 17 PLATTEVILLE CO 80651-9405 KROES FAMILY REVOCABLE TRUST 8509 AVENUE 152 TIPTON CA 93272-9761 FRANK ROGER PO BOXA MILLIKEN CO 80543-0016 OLSON BROS LP PO BOX 86 JOHNSTOWN CO 80534-0086 KIRBY DELBERT ARTHUR 19822 COUNTY ROAD 15 JOHNSTOWN CO 80534-9220 TWP USR SUPPLEMENT 2 SECTION 6IRRIGATION DITCH, LATERAL, OR PIPELINE OWNERS 6-2 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 6.1 List of Owners of Irrigation Ditches or Laterals Traversing the TWP Easements or Appurtenant Facility Sites Owner Name Address City State Zip Code BINDER FAMILY FARMS LLC 9783 COUNTY ROAD 46 1/2 MILLIKEN CO 80543-9403 COLLINS MARGARET O PO BOX 490 JOHNSTOWN CO 80534-0490 A & H FARMS LLC 1014 N 3RD ST JOHNSTOWN CO 80534-8840 KERR-MCGEE GATHERING LLC PO BOX 173779 DENVER CO 80217-3779 WIND FRANK 8276 BLACKWOOD DR WINDSOR CO 80550-8019 BETZ STEVEN M 6022 COUNTY ROAD 52 JOHNSTOWN CO 80534-8210 KAMMERZELL JACOB TRUST 2130 S SAINT PAUL ST DENVER CO 80210-4906 LOVELAND READY MIX INC PO BOX 299 LOVELAND CO 80539-0299 CUMMINGS JOHN L PO BOX 814 WINDSOR CO 80550-0814 GERRARD INVESTMENTS LLC 27154 COUNTY ROAD 13 JOHNSTOWN CO 80534-8205 ANADARKO E&P ONSHORE LLC PO BOX 173779 DENVER CO 80217-3779 LIND MARTIN 29486 COUNTY ROAD 13 WINDSOR CO 80550-3413 SONDRUP FAMILY WEALTH TRUST 34310 COUNTY ROAD 13 WINDSOR CO 80550-2804 STALEY FARM INVESTMENTS LLC 1017 WILMINGTON DR STE FORT COLLINS CO 80528-6103 HILL ALDEN V 318 S GRANT AVE FORT COLLINS CO 80521-2537 STARS AND STRIPES 3Q LLC 1123 ZONOLITE RD NE STE 30 ATLANTA GA 30306-2016 MOORE KEVIN 38434 COUNTY ROAD 13 FORT COLLINS CO 80524-9008 GLANVILLE MICHELLE L 39500 COUNTY ROAD 13 FORT COLLINS CO 80524-9058 MYERS FREDERICK L PO BOX 471 BAGGS WY 82321-0471 GBP LLC PO BOX 1986 FORT COLLINS CO 80522-1986 DYECREST DAIRY LLC 1137 N COUNTY LINE RD FORT COLLINS CO 80524 BROUGH TIMOTHY R 6135 PHEASANT CREST DR FORT COLLINS CO 80524-8766 NORTH WELD CO WATER DISTRICT PO BOX 56 LUCERNE CO 80646-0056 SCHNEIDER EUGENE F FAMILY TRUST 241 RIDGE ST STE 100 RENO NV 89501-2055 NELSON J SCOTT 6498 COUNTY ROAD 88 FORT COLLINS CO 80524-9127 MACHIN HAROLD A 43474 COUNTY ROAD 13 FORT COLLINS CO 80524-9102 LLC 410SPABS 5000 E MISSISSIPPI AVE STE GLENDALE CO 80246-3053 TWP USR SUPPLEMENT 2 SECTION 6IRRIGATION DITCH, LATERAL, OR PIPELINE OWNERS 6-3 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 6.2 List of Owners of Pipelines Traversing the TWP Easements or Appurtenant Facility Sites Owner Name Address City State Zip Code KN GAS GATHERING, INC 1001 LOUISIANA STREET, SUITE 1000 HOUSTON TX 77002 OCCIDENTAL 1099 18TH STREET, SUITE 1800 DENVER CO 80202 GREELEY WATER AND SEWER DEPARTMENT 1100 10TH STREET, SUITE 200 GREELEY CO 80631 NORTHERN NATURAL GAS 1111 SOUTH 103RD STREET OMAHA NE 68124 BP AMOCO 1700 PLATTE STREET, SUITE150 DENVER CO 80202 SUNCOR ENERGY (USA) PIPELINE CO 1715 FLEISCHLI PKWY CHEYENNE WY 82001 PDC ENERGY 1775 SHERMAN STREET DENVER CO 80203 XCEL ENERGY 1800 LARIMER STREET SUITE 1100 DENVER CO 80202 SADDLE BUTTE PIPELINE 1900 16TH ST., SUITE 1550 DENVER CO 80202 NORTHERN WATER 220 WATER AVENUE BERTHOUD CO 80513 CENTRAL WELD COUNTY WATER DISTRICT 2235 2ND AVENUE GREELEY CO 80631 DEVON ENERGY 333 WEST SHERIDAN AVENUE OKLAHOMA CITY OK 73102-5015 DCP MIDSTREAM, LP 370 17TH STREET, SUITE 2500 DENVER CO 80202 EXTRACTION OIL & GAS 370 17TH STREET, SUITE 5300 DENVER CO 80202 KERR-MCGEE/ANADARKO/OXY 370 VAN GORDON STREET LAKEWOOD CO 80228 NGL WATER SOLUTIONS, LLC 3773 CHERRY CREEK NORTH DRIVE, SUITE 1000 DENVER CO 80209 NATURAL GAS ASSOCIATES 1801 BROADWAY, #1200 DENVER CO 80202 WILLIAMS ONE WILLIAMS CENTER P.O. BOX 2400 TULSA OK 74102-2400 ENERGY TRANSFER 8111 WESTCHESTER DRIVE DALLAS TX 75225 UNITED WATER AND SANITATION DISTRICT 8301W. PRENTICE AVENUE, SUITE 120 GREENWOOD VILLAGE CO 80111 COLORADO INTERSTATE GAS CO. P.O. BOX 1087 COLORADO SPRINGS CO 80944 NORTH WELD COUNTY WATER DISTRICT P.O. BOX 56 LUCERNE CO 80646 SINCLAIR PIPE LINE COMPANY PO BOX 185 100 E. WASHINGTON SINCLAIR WY 82334 TWP USR SUPPLEMENT 2 SECTION 6IRRIGATION DITCH, LATERAL, OR PIPELINE OWNERS 6-4 Section 7 Mineral Owner's Agreement, If Applicable This section addresses Procedural Guide Checklist, mineral owner's agreement, if applicable. Water pipelines or appurtenances to said water pipelines are excluded from the definition of "applications for development" as provided in C.R.S. § 24-65.5-102(2)(a). Weld County Code ("WCC") 23-1-90 defines PIPELINE - DOMESTIC WATER as "[a]ny pipeline sixteen (16) inches in diameter or larger and appurtenant components thereof (such as valves or pump stations) designed for transporting DOMESTIC WATER in such pipeline ...." Weld County confirmed by email dated March 3, 2020 that the TWP water storage tank is an appurtenance to the pipeline under WCC 23-1-90. Accordingly, because the TWP water pipeline and its appurtenant pumps stations and water storage tank are excluded from the definition of "applications for development" under C.R.S. § 24-65.5-102(2)(a), the mineral estate owner notification requirement under C.R.S. § 24-65.5403 is not applicable to this application. In addition, on February 6, 2020, Weld County staff stated that the mineral owner's agreement is not applicable to this application. A summary of that discussion is included in section USR Procedural Guide Checklist. TWP USR SUPPLEMENT 2 SECTION 7 MINERAL OWNERS AGREEMENT, IF APPLICABLE 7-1 Section 8 Recent Deed This section addresses Procedural Guide Checklist, copy of recent deed or evidence of interest held by applicant. A copy of recent deed or evidence of interest held by applicant is not applicable to the TWP. On February 6, 2020, Weld County staff stated that a copy of recent deed or evidence of interest is not applicable to the TWP. A summary of that discussion is included in section USR Procedural Guide Checklist. TWP USR SUPPLEMENT 2 SECTION 8 RECENT DEED 8-1 Section 9 Certificate of Conveyances Form This section addresses Procedural Guide Checklist, Certificate of Conveyances (Chain of Title) form. A Certificate of Conveyances (Chain of Title) form is not applicable to the TWP. On February 6, 2020, Weld County staff stated that a Certificate of Conveyances form is not applicable to the TWP. A summary of that discussion is included in section USR Procedural Guide Checklist. TWP USR SUPPLEMENT 2 SECTION 9 CERTIFICATE OF CONVEYANCES FORM 9-1 Section 10 Statement of Taxes This section addresses Procedural Guide Checklist, statement of taxes. A statement of taxes is not applicable to the TWP. On February 6, 2020, Weld County staff stated that a statement of taxes is not applicable to the TWP. A summary of that discussion is included in section USR Procedural Guide Checklist. TWP USR SUPPLEMENT 2 SECTION 10 STATEMENT OF TAXES 10-1 Section 11 USR Map This section addresses Procedural Guide Checklist, USR map, WCC Section 23-2-440 F, and WCC Section 23-2-520. USR Permit Maps are included in Second Supplemental Permit Application, Volume 3, USR18-0130 Permit Maps. In accordance with WCC Section 23-2-440 F, Supplement 2 includes an electronic file (Adobe Acrobat © Portable Document Format, PDF) of Second Supplemental Permit Application Volume 3, USR18- 0130 Permit Maps for Weld County's preliminary approval. Thornton has met multiple times with staff from the Weld County Planning and Public Works departments regarding the TWP, the USR permit application process, and permit requirements. The Pre -Application meetings held on May 27, 2016, August 25, 2016, January 17, 2019, and March 13, 2020 along with follow-up discussions provided Thornton with guidance and recommendations from Weld County staff to help ensure a complete permit application submittal. Thornton has continued to consult with the Weld County Planning staff throughout the development of this Supplement 2, including periodic telephone and e-mail communications. The USR maps provided are in accordance with WCC Section 23-2-440 F, and WCC Section 23-2-520. TWP USR SUPPLEMENT 2 SECTION 11 USR MAP 11-1 Section 12 Notice of Inquiry, If Applicable This section addresses Procedural Guide Checklist, notice of inquiry, if applicable. As requested by Weld County staff, Thornton sent Notice of Inquiry forms provided by Weld County to Berthoud, Dacono, Firestone, Fort Lupton, Frederick, Johnstown, Mead, Milliken, Platteville, Severance, Timnath, and Windsor. Exhibits 12.1 through Exhibit 12.8b include signed Notice of Inquiry forms or response received from Berthoud, Firestone, Frederick, Mead, Milliken, Platteville, Severance, and Windsor. No response was received from the others. If response is received after submission of Supplement 2, Thornton will provide the response to Weld County. Thornton's requests are included in Exhibits 12.9a and 12.9b through 12.20a and 12.20b. Exhibit 12.21 includes the map that was provided with each request. TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-1 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Diana Aungst From: Curt Freese <CFreese@berthcud.org> Sent: Wednesday, March 18, 2020 3:31 PM To: Tom Parko Jr. Cc: Diana Aungst Subject: RE: PRE20-0036 Thornton Water Pipeline Caution, This email originated from outside of Weld County Government. Do not click links or open attachments unless you recognize the sender and know the content is safe. Tom, it appears the new pipeline location goes quite a bit East of our GMA. As such, we wouldn't have any comments. Curt Freese, AICP Community Development Director Town of Berthoud 807 Mountain Avenue Berthoud CO, 80513 Office: 970-532-2643 Email: CFreese@berthoud.org From: Tom Parka Jr. <tparko@weldgov.com> Sent: Wednesday, March 18, 2D20 3:16 PM To: Curt Freese <CFreese@berthoud.org> Cc: Diana Aungst <daungst@weldgov.com> Subject: FW: PRE20-0036 Thornton Water Pipeline Dear Curt, Good afternoon. I hope all is well. Attached is a pre application for the Thornton Water Pipeline project. We realize that you may have received similar information in the past, but the Board of County Commissioners continued the case until July 2020, due in part, because the original submittal only included Phase 1 of the project. The County Commissioners requested that the City amend the special use permit to include all phases of the project. The revised submittal also includes one above ground water storage tank and two pump stations. Details can be found in the attached application. The City will be reaching out to you shortly, if they haven't already. As always, let us know if you have any questions and stay healthy! Sincerely, Torn Parka Director, Dept. of Planning Services Weld County EXHIBIT 12.1 Berthoud Response to Weld County Planning TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-2 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Notice of County Inquiry .....w. Weld :,� Pre -application Case # PRE20-0036 Date of Inquiry 3/13/20 Municipality Firestone CPA Name of Person Inquiring Mark Koleber, Thornton Water Project Director Property Owner Multiple Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungst@weldgov.com Legal Description Multiple Parcel Number Multiple Nearest Intersection Varies Type of Inquiry Water Pipeline The Intergovernmental -0 above person keiAC.�t� with 1..4 County C. Planning staff Planning about Agreement developing a Boundary. parcel of land inside your designated met Agreement/Coordinated kA County Planner's signature Would Date Comments: of you Contact like to pursue annexation 9 /1-/ 2OZ-0 of this property? NO `'` YES t of Viral/ Municipality M rsid/144 epresentative 9LAIQKJIPQf ArdA - ILb 2010 Si nature Title Date Please and return sign and this signed date form to acknowledge to Weld County that the Department applicant of has Planning contacted Services. you 1655 N 17th Feld Ave, Greeley, County Planning CO 80631 Department - (970) 400-6100 -v (970) 304-6498 Fax 20181107 EXHIBIT 12.2 Firestone Signed Notice of Inquiry TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-3 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION > 1 61 Notice Inquiry of ill Weld County �1 GOuNTY Pre -application Case # PRE20-0036 Date of Inquiry 3/13/20 Municipality Frederick CPA Name of Person Inquiring Mark Koleber, Thornton Water Project Director Property Owner Multiple Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungst@weldgov.com Legal Description Multiple Parcel Number Multiple Nearest Intersection Varies Type of Inquiry Water Pipeline Intergovernmental The above '1'N person met Agreement/Coordinated thyv with County asi;ki Planning staff Planning about Agreement developing a Boundary. parcel of land inside your designated County Planner's signature Would you like to pursue annexation of this property? NO X YES Date of Contact jMarch 24, 2020 1 Comments: -to The Town must still reach agreement on the easement on Town property and reserves the right further comment. . JiSimmons l I Planning Director j03/24/2020 Signature of Municipality Representative Title Date Please and return sign this and signed date to form acknowledge to Weld County that the Department applicant of has Planning contacted Services you Weld County 1555 N 17th Ave, Greeley, Planning CO 80631 --- (970) Department 400-6100 - (970) 304-6498 Fax 20181107 EXHIBIT 12.3 Frederick Signed Notice of Inquiry TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12 4 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Notice of Inquiry Weld County Pre -application Case # PRE20-0036 Date of Inquiry 3/13/20 Municipality Mead CPA Name of Person Inquiring Mark Koleber, Thornton Water Project Director Property Owner Multiple Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungst@weldgov.com Legal Description Multiple Parcel Number Multiple Nearest Intersection Varies Type of Inquiry Water Pipeline The above person met with County Planning staff about developing a parcel of Ian I inside your designated Intergovernmental Agreement/Coordinated Planning Agreement Boundary Dr\ \ Own County Planner's signature Mee _ Would you like to pursue annexation of this property? NO Date of Contact Comments. YES PI O31Y) ii;116---D tre-C---kor C.0 Signature of Municipeesentative Title Date Please sign and date to acknowledge that the applicant has contacted you and return this signed form to Weld County Department of Planning Services Weld County Planning Department 1555 N 17th Ave, Greeley, CO 80631 - (970) -00-6100 - (970) 304-6498 Fax 20181107 EXHIBIT 12.4a Mead Signed Notice of Inquiry TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12 `? THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION From: Mark Koleber To: fl-ctooher Kennehv" Cc: Tom Park:, Jr.; Erika Rasmussen; tcennefi J. Clifford (kdiffordCaiivaiva.com); J-ienrv. Jody/DEN Subject: [EXTERNAL] RE: Weld County Notice of Inquiry - Thornton Water Project Date: Tuesday, April 7, 2020 1:47:37 PM Attachments: u rnaoe004 . onq jvead WCR 17 Hvivfp6 r d ( Chris, Attached are survey drawings for the location of our proposed water pipeline in the vicinity of Weld County Road 17 and Hwy 66. The pipeline will be located outside Mead's planned 70' Right -of -Way for Weld County Road 17, and outside Weld County's planned 140' Right -of -Way for Weld County Road 17. Please look over the attached drawings and let me know if you nave further questions or comments. Thanks Mark Koleber Thornton Water Project Director City of Thornton 12450 Washington St Thornton, Colorado 80241-2405 303-255-7790 Mark.Ko lebereThomtonCO.gov From: Christopher Kennedy <ckennedy@townofinead.org> Sent: Monday, March 23, 2020 5:46 PM To: Mark Koleber <Mark.Koleber@cityofthornton.net>; 'Henry, Jody/DEN' <Jody.Henry@jacobs.com> Cc: Tom Parko Jr. c-tparko@weldgov.com>; Erika Rasmussen cerasmussen@townofmead.org>; Kenneth J. Clifford (kclifford@jvajva.com) <kclifford@jvajva.corn> Subject: [EXTERNAL] RE: Weld County Notice of Inquiry - Thornton Water Project Mark, Thank you for the opportunity to comment. We are requesting that the pipeline easement be located outside of Mead's future ROW, as outlined in the master transportation plan (pg. 28, fig. 11 master streets plan: t• •-.t of a' es/ h t ! gi c o �, ^� s 7 �, f town ofr-:ead.org.). Looks like there may be some conflicts in the CR 17/Hwy 66 vicinity. Please provide a more detailed map that overlays the proposed pipeline route on top of Mead's anticipated ROW in the area for staff's review. Let me know if you need additional info from us. Thanks, Chris EXHIBIT 12.4b Mead Response to Notice of Inquiry Request TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-6 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION II Ley ara n \Ili L I, 4. Notice of Inquiry , i is ,,,, I .%,. � Weld County ,, T- Pre -application Case # PRE20-0036 _ Date of Inquiry 3/13/20 Municipality Milliken CPA Name of Person Inquiring i Mark Koleber, Thornton Water Project Director Property Owner Multiple Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungst©weldgov.com - Legal Description t Multiple 1 Parcel Number Multiple Nearest Intersection Varies Type of Inquiry Water Pipeline Intergovernmental The above person met Agreement/Coordinated with County r Planning staff Planning about Agreement developing a Boundary. parcel cf land inside your designated County Planner's signature Would you like to pursue annexation of this property? NO X YES Date of Contact Comments: While Milliken would like to p&xtieipate in this water project, the location is too far from our municipal limits. ' Community Dev. Director 4/4/2020 Signa a df unicipatity Representative Title Date Please sign and date to acknowledge that the applicant has contacted you and return this signed form to Weld County Department of Planning Services. 1655 N 17th Weld Ave, Greeley, County Planning CO 80881 -- (970) Department 4OO-6100 -- (970) Soo -6498 Fax 20181107 EXHIBIT 12.5 Milliken Signed Notice of Inquiry TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION �� 3861- -,�-.-�;. -�. Notice of Inquiry • � rl�' �l =�-�t � Weld e d County c0uNi? �i S Pre -application Case # PRE20-0036 Date of Inquiry 3/13/20 Municipality Platteville CPA Name of Person Inquiring Mark Koleber, Thornton Water Project Director Property Owner Multiple Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungst@weldgov.com Legal Description Multiple Parcel Number Multiple Nearest Intersection Varies Type of Inquiry Water Pipeline Intergovernmental The Th above �-o person Ltni met Agreement/Coordinated with l, County Planning staff Planning about Agreement developing a Boundary. parcel of land inside your designated County Planner's signature Would you like to pursue annexation of this property? NO ✓ YES I Date of Contact � /,243 /in Comments: _ , i77— 7A i a"' 1• I r'�-d e a ZA-3 en / ,rid w ij Signature of Municipality Representative Title Date Please sign and date to acknowledge that the applicant has contacted you and return this signed form to Weld County Department of Planning Services. 1555 N 17th Weld Ave, Greeley, County Planning CO 80631 -- (970) Department 400-6100 _ (97O) 304.6498 Fax 20191107 EXHIBIT 12.6 Platteville Signed Notice of Inquiry TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12 8 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION :Ls_me,\.86.,... Nonce • of Inquiry Weld County - Gp��? C Pre -application Case # PRE20-0036 Date of Inquiry 3/13/20 Municipality Severance CPA Name of Person Inquiring Mark Koleber, Thornton Water Project Director Property Owner Multiple Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungst@weldgov.com Legal Description p Multiple Parcel Number Multiple Nearest Intersection Varies Type of Inquiry Water Pipeline Intergovernmental The above (iv` person is_.tL met Agreement/Coordinated 1,'9 with County g. Planning staff Planning about Agreement developing Boundary. a parcel of land inside .i your designated County Planner's signature Would you like to pu sue nnexation of this property? NO./\ YES Date Date of Contact S I i to P F6lt.►`�o0-3 8 t' ritircilika 7.O.atit. Comments: [Fie_ 51,..4rt OF I tit T�e. -St.vr2At-tcx i-A_S AN! Li.%_ i- 1Nt nage4:.e.L L,t r--i r < ? Q Z At-tu K A U U - -- u_ o ci L \T' icr »-t v-, .s.LUt / i i i. t Ca •.. ►�.<x4 n Pf Jf L -o rill.' � 4RLLT14 t 3 t Z p � Si nature of Municipality Representative Title D to Please sign and date to acknowledge that the applicant has contacted you and return this signed form to Weld County Department of Planning Services. Weld County Planning Department 1555 N 17th Ave, Greeley, CO 80631 ' (97O) 400-6100 -- (97O) 304-6498 Fax 20181107 EXHIBIT 12.7 Severance Signed Notice of Inquiry TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12 9 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION From: Sandra Mezzetti <smezzetti@windsorgov.com> Sent: Friday, April 3, 2020 8:42 AM To: Henry, Jody/DEN <Jody.Henry@jacobs.com> Subject: [EXTERNAL] RE: Weld County Notice of Inquiry - Thornton Water Project Jody, I following up on USR18-0130. I wanted to confirm you received a no comment response from the Town of Windsor. If not, no comment is the official response. Sandra Mezzetti, AICP Planner I Town of Windsor I Planning 301 Walnut Street !Windsor CO 80550 Dir: 970-674-2430 I Off: 970-674-2400 I Fax: 970-674-2456 smezzetti 7windsorgov corn www.windsorgov.corn From: Scott Ballstadt <sballstadt@windsorgov.com> Sent: Friday, March 20, 2020 4:37 PM To: Mark Koleber <Mark.Koleber@cityofthornton.net> Cc: Henry, Jody/DEN <Jody.Henry@jacobs.com>; John Thornhill <'thornhill@w ndsorgov.com>; Omar Herrera <oherrera@windsorgov.com>; PLANNING <Planning@windsorgov.com> Subject: [EXTERNAL] RE: Weld County Notice of Inquiry - Thornton Water Project Thanks Mark. We also received the referral materials regarding the project from Weld County. We will review and get back to you next week. Hope you and your family are well as well. Scott Scott Ballstadt, AICP Director Town of Windsor I Planning Dir: 970-674-2411 From: Mark Koleber <Mark.Koleber@cityofthornton.net> Sent: Friday, March 20, 2020 4:06 PM To: Scott Ballstadt <sballstadt@windsorgov.com> Cc: 'Henry, Jody/DEN' <Jody.Henry@jacobs.com> Subject: Weld County Notice of Inquiry - Thornton Water Project Attachments: Windsor N0I Form.pdf TWP_ Weld_ County_ Align men t.pdf Scott, I hope you and your family are well. As requested by Weld County, Thornton is contacting municipalities regarding Thornton's USR permit application to construct a 42 -inch domestic water pipeline and appurtenances in unincorporated Weld County, and is specifically contacting you regarding construction on properties within the town of Windsor's Three (3) Mile Area. A map showing the TWP alignment is attached. Per Weld County Code, Weld County is required to notify affected jurisdictions as indicated in Coordinated Planning Agreements. As requested by Weld County, Thornton is providing the attached Notice of Inquiry form. Please review and sign the attached form and return it to me, and I'll provide it to Weld County. The city of Thornton (Thornton) is currently developing a Weld County Use by Special Review (USR) Supplemental Permit Application for the Thornton Water Project (TWP), which includes up to approximately 33.9 miles of buried 42 -inch domestic water transmission pipeline and associated appurtenances in unincorporated Weld County. The Supplemental 1of2 EXHIBIT 12.8a Windsor Response to Notice of Inquiry Request (page 1 of 2) TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12 10 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Permit Application will supplement Thornton's Use by Special Review permit application that was previously submitted to Weld County for a segment of the TWP, Permit Application Segment 1. The Supplemental Permit Application will include new information, information that was previously submitted, and revisions to information that was previously submitted. Thornton plans on submitting this supplemental application soon. The water pipeline alignment for the TWP is within the Weld County/Windsor Coordinated Planning Agreement area extending from approximately Weld County Road 84 to Weld County Road 52 and generally runs north/south as follows: • Weld County Road 84 to State Highway 34: The water pipeline generally parallels Weld County Road 13 then transitions east to Weld County Road 13 %. • State Highway 34 to Weld County Road 52: The water pipeline generally parallels Weld County Road 13 f. Typically, a 5D -foot permanent easement for the domestic water pipeline and an additional 40 -foot temporary easement for construction has been or is in the process of being purchased from property owners. Please let me know if you have any questions. Thanks, Mark Koleber Thornton Water Project Director City of Thornton 12450 Washington St. Thornton, Colorado 80241-2405 303-255-7790 Ma rk. Kol e b e r@ThorntonCO.gov The City of Thornton has changed their domain name, so my email extension is changing. Please change your e-mail address for me in future correspondence to: Mark.Koleberia")ThoritonCo,gov. You may sec the old extension for a while as the City makes the transition to the new domain name. * 2of2 EXHIBIT 12. EXHIBIT 12.8b Windsor Response to Signed Notice of Inquiry Request (page 2 of 2) TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-11 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION From: Mark Koleber<Mark.Koleber@cityofthornton.net> Sent: Friday, March 20, 2020 4:09 PM To: cfreese@berthoud.org Cc: Henry, Jody/DEN <Jody.Henry@jacobs.com> Subject: [EXTERNAL] Weld County Notice of Inquiry -Thornton Water Project Attachments: Berthoud NDI Form.pdf TWP_Weld_County_Alignment.pdf P_Wel d_County_Al ign m e nt. p d f Mr. Freese, As requested by Weld County, Thornton is contacting municipalities regarding Thornton's LISR permit application to construct a 42 -inch domestic water pipeline and appurtenances in unincorporated Weld County, and is specifically contacting you regarding construction on properties within the town of Berthoud's Three [3) Mile Area. A map showing the TWP alignment is attached. Per Weld County Code, Weld County is required to notify affected jurisdictions as indicated in Coordinated Planning Agreements. As requested by Weld County, Thornton is providing the attached Notice of Inquiry form. Please review and sign the attached form and return it to me, and I'll provide it to Weld County. The city of Thornton (Thornton) is currently developing Weld County Use by Special Review (USR) Supplemental Permit Application for the Thornton Water Project (TWP), which includes up to approximately 33.9 miles of buried 42 -inch domestic water transmission pipeline and associated appurtenances in unincorporated Weld County. The Supplemental Permit Application will supplement Thornton's Use by Special Review permit application that was previously submitted to Weld County for a segment of the TWP, Permit Application Segment 1. The Supplemental Permit Application will include new information, information that was previously submitted, and revisions to information that was previously submitted. Thornton plans on submitting this supplemental application soon. The water pipeline alignment for the TWP is within the Weld County/Berthoud Coordinated Planning Agreement (CPA) area extending from approximately Weld County Road 52 to Weld County Road 34 and generally runs north/south as follows: • Weld County Road 52 to Weld County Road 50: The water pipeline generally parallels Weld County Road 13 within 4 mile east of Weld County Road 13 for approximately 1 mile then transitions west and enters into the Town of Johnstown for approximately 3.7 miles. • Weld County Road 44 to Weld County Road 34: The water pipeline transitions out of the Town ofJohnstown near Weld County Road 44 and parallels Weld County Road 15 for approximately 1 mile to Weld County Road 42, then transitions east for approximately % mile then south and generally parallels Weld County Road 15% to Weld County Road 34. Typically, a 50 -foot permanent easement for the domestic water pipeline and an additional 40 -foot temporary easement for construction has been or is in the process of being purchased from property owners. A 40 million gallon per day pump station is located within the CPA area approximately ! mile east of Weld County Road 13 on the south side and adjacent to Weld County Road 50. That appurtenance will include an approximate 3 acre site. Please let me know if you have any questions. Thanks, Mark Koleber Thornton Water Project Director City of Thornton 12450 Washington St. Thornton, Colorado 80241-2405 303-255-7790 Mark.Koleber@ThorntonCO.gov a 4`*The City of Thornton has changed their domain name, so my email ex -tension is changing. Please change your e-mail address for me in future correspondence to: Mark.KoleherYcr.!ThorntonCo. gov. You may see the old extension for a while as the City makes the transition to the new domain name. x*n EXHIBIT 12.9a Notice of Inquiry Email Request to Berthoud TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-12 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION tip" Notice of Inquiry 11 — G0 j ITY, Weld County _ Pre -application Case # PRE20-0036 Date of Inquiry 3/13/20 Municipality Berthoud CPA Name of Person Inquiring Mark Koleber, Thornton Water Project Director Properly Owner Multiple Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungst@weldgov.com Legal Description Multiple Parcel Number Multiple Nearest Intersection Varies Type of inquiry Water Pipeline The above person met with County Planning staff about developing a parcel of land inside your designated Intergovernmental Agreement/Coordinated Planning Agreement Boundary. -1,:)0, .0._,,.v \ q..•l County Planner's signature Would you like to pursue annexation of this property? NO YES Date of Contact Comments: Signature of Municipality Representative Title Date Please sign and date to acknowledge that the applicant has contacted you and return this signed form to Weld County Department of Planning Services. Weld County Planning Department 1555 N 17th Ave, Greeley, CO 8O631 - (97O) 4O0-61OO -, (97O) 3O4-6498 Fax 26181107 EXHIBIT 12.9b Notice of Inquiry Email Request Attachment to Berthoud TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-13 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION From: Mark Koleber<Mark.Koleber@cityofthornton.net> Sent: Friday, March 20, 2020 4:08 PM To: Jennifer Krieger (JKrieger@CityofDacono.com) <IKrieger@CityofDacono.com> Cc: Henry, Jody/DEN <Jody.Henry@jacobs.com> Subject: [EXTERNAL] Weld County Notice of Inquiry -Thornton Water Project Attachments: Dacono NOI Form.pdf T W P_Wel d_County_Al ign m e nt. p d f Ms. Krieger, As requested by Weld County, Thornton is contacting municipalities regarding Thornton's LISR permit application to construct a 42 -inch domestic water pipeline and appurtenances in unincorporated Weld County, and is specifically contacting you regarding construction on properties within the city of Dacono's Three (3) Mile Area. A map showing the TWP alignment is attached. Per Weld County Code, Weld County is required to notify affected jurisdictions as indicated in Coordinated Planning Agreements. As requested by Weld County, Thornton is providing the attached Notice of Inquiry form. Please review and sign the attached form and return it to me, and I'll provide it to Weld County. The city of Thornton (Thornton) is currently developing Weld County Use by Special Review (USR) Supplemental Permit Application for the Thornton Water Project (TWP), which includes up to approximately 33.9 miles of buried 42 -inch domestic water transmission pipeline and associated appurtenances in unincorporated Weld County. The Supplemental Permit Application will supplement Thornton's Use by Special Review permit application that was previously submitted to Weld County for a segment of the TWP, Permit Application Segment 1. The Supplemental Permit Application will include new information, information that was previously submitted, and revisions to information that was previously submitted. Thornton plans on submitting this supplemental application soon. The water pipeline alignment for the TWP is within the Weld County/Dacono Coordinated Planning Agreement area extending from approximately Weld County Road 14 to Weld County Road 8 and generally runs north/south parallel to Weld County Road 17. Typically, a 50 -foot permanent easement for the domestic water pipeline and an additional 40 -foot temporary easement for construction has been or is in the process of being purchased from property owners. Please let me know if you have any questions. Thanks, Mark Koleber Thornton Water Project Director City of Thornton 12450 Washington St. Thornton, Colorado 80241-2405 303-255-7790 Mark.Kaleber@TharntanCO.gov "l'*The City of Thornton has changed their domain name, so mfr email ex -tension is changing. Please change your e-mail address for me in future correspondence to: Mark.KolehenialtorntonCo. gov. You may see the old extension for a while as the City makes the transition to the new domain name. x*n EXHIBIT 12.10a Notice of Inquiry Email Request to Dacono TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-14 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Notice of Inquiry Weld County Pre -application Case # P R E20-0036 Date of Inquiry 3/13/20 Municipality Dacono IGA Name of Person Inquiring Mark Koleber, Thornton Water Project Director Property Owner Multiple Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungst@weldgov.com Legal Description Multiple Parcel Number Multiple Nearest Intersection Varies Type of Inquiry Water Pipeline The above person met with County Planning staff about developing a parcel of land inside your designated Intergovernmental Agreement/Coordinated Planning Agreement Boundary. 1 ("x c_ .VC County Planner's signature Would you like to pursue annexation of this property? NO Date of Contact Comments: YES Signature of Municipality Representative Title Date Please sign and date to acknowledge that the applicant has contacted you and return this signed form to Weld County Department of Planning Services. Weld County Planning Department 1555 N 17th Ave, Greeley, CO 80631 -- (970) 400-6100 — (970) 104-6498 Fax 2U1811UT EXHIBIT 12.10b Notice of Inquiry Email Request Attachment to Dacono TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-15 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION From: Mark Koleber Sent: Friday, March 20, 2020 4:08 PM To: 'Marty Ostholthoft <MOstholthoff@FirestoneCO.gov> Cc: 'planning@firestoneco.gov' <planning@firestoneco.gov>; dlindsay@ccginc.us Subject: Weld County Notice of Inquiry - Thornton Water Project Attachments: Firestone NOI Form.pdf TWP_Weld_County_Alignment.pdf Marty, Sorry we've been playing phone tag lately. I hope we can get together soon. As requested by Weld County, Thornton is contacting municipalities regarding Thornton's USR permit application to construct a 42 -inch domestic water pipeline and appurtenances in unincorporated Weld County, and is specifically contacting you regarding construction on properties within the town of Firestone's Three (3) Mile Area. A map showing the TWP alignment is attached. Per Weld County Code, Weld County is required to notify affected jurisdictions as indicated in Coordinated Planning Agreements. As requested by Weld County, Thornton is providing the attached Notice of Inquiry form. Please review and sign the attached form and return it to me, and I'll provide it to Weld County. The city of Thornton (Thornton) is currently developing a Weld County Use by Special Review (USR) Supplemental Permit Application for the Thornton Water Project (TWP), which includes up to approximately 33.9 miles of buried 42 -inch domestic water transmission pipeline and associated appurtenances in unincorporated Weld County. The Supplemental Permit Application will supplement Thornton's Use by Special Review permit application that was previously submitted to Weld County for a segment of the TWP, Permit Application Segment 1. The Supplemental Permit Application will include new information, information that was previously submitted, and revisions to information that was previously submitted. Thornton plans on submitting this supplemental application soon. The water pipeline alignment for the TWP is within the Weld County/Firestone Coordinated Planning Agreement area extending from approximately Weld County Road 36 to Weld County Road 10 and generally runs north/south as follows: • Weld County Road 36 to approximately mile north of State Highway 66: The water pipeline generally parallels Weld County Road 15'/z. • Approximately'/ mile north of State Highway 66 to Weld County Road 10: The water pipeline transitions generally parallels Weld County Road 17. Typically, a 50 -foot permanent easement for the domestic water pipeline and an additional 40 -foot temporary easement for construction has been or is in the process of being purchased from property owners. Please let me know if you have any questions. Thanks, Mark Koleber Thornton Water Project Director City of Thornton 12450 Washington St. Thornton, Colorado 80241-2405 303-255-7790 Mark.Koleber@ThorntonCO.gov ***The City of Thornton has changed their domain name, so my email extension is changing. Please change your e-mail address for me in future correspondence to: Mark. Koleber( ThorntonCo.gov. You may see the old extension for a while as the City' makes the transition to the new domain name. 4.4- T EXHIBIT 12.11a Notice of Inquiry Email Request to Firestone TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-16 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION .,4123_61.,..„Notice of Inquiry 2_ GGIJN_7Y !I r ti Weld County Pre -application Case # PRE20-0036 Date of Inquiry 3/13t20 Municipality Firestone CPA Name of Person Inquiring Mark Koleber, Thornton Water Project Director Property Owner Multiple Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungst@weldgov.com Legal Description Multiple Parcel Number Multiple Nearest Intersection Varies Type of Inquiry Water Pipeline The above person met with County Planning staff about developing a parcel of land inside your designated Intergovernmental Agreement/Coordinated Planning Agreement Boundary. n 1 County Planner's signature Would you like to pursue annexation of this property? NO YES Date of Contact Comments: Signature of Municipality Representative Title Date Please sign and date to acknowledge that the applicant has contacted you and return this signed form to Weld County Department of Planning Services. Weld County Planning Department 1555 N 17th Aye, Greeley, CO 80631 — (970) 400-6100 — (910) 304-6498 Fax 20181107 EXHIBIT 12.11b Notice of Inquiry Email Request Attachment to Firestone TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-17 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION From: Mark Koleber <Mark.Koleber@cityofthornton.net> Sent: Friday, March 20, 2020 4:08 PM To:'thodges@fortluptonco.gov' <thodges@fortluptonco.gov> Cc: Henry, Jody/DEN <Jody.Henry@jacobs.com> Subject: [EXTERNAL] Weld County Notice of Inquiry - Thornton Water Project Attachments: Fort Lupton NCI Form.pdf TWP_Weld_County_Alignment.pdf Mr. Hodges, As requested by Weld County, Thornton is contacting municipalities regarding Thornton's USR permit application to construct a 42 -inch domestic water pipeline and appurtenances in unincorporated Weld County, and is specifically contacting you regarding construction on properties within the city of Fort Lupton's Three (3) Mile Area. A map showing the TWP alignment is attached. Per Weld County Code, Weld County is required to notify affected jurisdictions as indicated in Coordinated Planning Agreements. As requested by Weld County, Thornton is providing the attached Notice of Inquiry form. Please review and sign the attached form and return it to me, and I'll provide it to Weld County. The city of Thornton (Thornton) is currently developing a Weld County Use by Special Review (USR) Supplemental Permit Application for the Thornton Water Project (TWP), which includes up to approximately 33.9 miles of buried 42 -inch domestic water transmission pipeline and associated appurtenances in unincorporated Weld County. The Supplemental Permit Application will supplement Thornton's Use by Special Review permit application that was previously submitted to Weld County for a segment of the TWP, Permit Application Segment 1. The Supplemental Permit Application will include new information, information that was previously submitted, and revisions to information that was previously submitted. Thornton plans on submitting this supplemental application soon. The water pipeline alignment for the TWP is within the Weld County/Fort Lupton Coordinated Planning Agreement area and generally runs north/south parallel to Weld County Road 17 extending from approximately State Highway 66 to Weld County Road 4. Typically, a 50 -foot permanent easement for the domestic water pipeline and an additional 40 -foot temporary easement for construction has been or is in the process of being purchased from property owners. Please let me know if you have any questions. Thanks, Mark Koleber Thornton Water Project Director City of Thornton 12450 Washington St. Thornton, Colorado 80241-2405 303-255-7790 Mark.<oleber@ThorntonCO.gov ***The City of Thornton has changed their domain name, so my email extension is changing. Please change your e-mail address for me in future correspondence to: MarLKoleberAThornt.onCo.gov. You may see the old extension for a while as the City makes the transition to the new domain name. * * * EXHIBIT 12.12a Notice of Inquiry Email Request to Fort Lupton TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-18 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION �.- 7 \ Notice of Weld County Inquiry Pre -application Case # PRE20-0036 Date of Inquiry 3113/20 Municipality Fort Lupton CPA Name of Person Inquiring Mark Koleber, Thornton Water Project Director Property Owner Multiple Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungstrgweldgov.com Legal Description Multiple Parcel Number Multiple Nearest Intersection Varies Type of Inquiry A Water Pipeline The above person met with County Planning staff about developing a parcel of land inside your designated Intergovernmental Agreement/Coordinated Planning Agreement Boundary. r ) +v U.( L; (.1 1 - County Planner's signature Would you like to pursue annexation of this property? NO YES Date of Contact Comments: Signature of Municipality Representative Title Date Please sign and date to acknowledge that the applicant has contacted you and return this signed form to Weld County Department of Planning Services. Weld County Planning Department 1555 N 17th Ave, Greeley, CO 80631 ^- (970) 4OO-61OO - (970) 304-6498 Fax 20181107 EXHIBIT 12.12b Notice of Inquiry Email Request Attachment to Fort Lupton TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-n THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION From: Mark Koleber <Mark.Koleber@cityofthornton.net> Sent: Friday, March 20, 2020 4:07 PM To:Isimmons@frederickco.gov' <jsimmons@frederickco.gov> Cc: Henry, Jody/DEN <Jody.Henry@jacobs.com> Subject: [EXTERNAL] Weld County Notice of Inquiry -Thornton Water Project Attachments: Frederick NOI Form.pdf TWP_Weld_County_Alignment.pdf Ms. Simmons, As requested by Weld County, Thornton is contacting municipalities regarding Thornton's USR permit application to construct a 42 -inch domestic water pipeline and appurtenances in unincorporated Weld County, and is specifically contacting you regarding construction on properties within the town of Frederick's Three (3) Mile Area. A map showing the TWP alignment is attached. Per Weld County Code, Weld County is required to notify affected jurisdictions as indicated in Coordinated Planning Agreements. As requested by Weld County, Thornton is providing the attached Notice of Inquiry form. Please review and sign the attached form and return it to me, and I'll provide it to Weld County. The city of Thornton (Thornton) is currently developing a Weld County Use by Special Review (USR) Supplemental Permit Application for the Thornton Water Project (TWP), which includes up to approximately 33.9 miles of buried 42 -inch domestic water transmission pipeline and associated appurtenances in unincorporated Weld County. The Supplemental Permit Application will supplement Thornton's Use by Special Review permit application that was previously submitted to Weld County for a segment of the TWP, Permit Application Segment 1. The Supplemental Permit Application will include new information, information that was previously submitted, and revisions to information that was previously submitted. Thornton plans on submitting this supplemental application soon. The water pipeline alignment for the TWP is within the Weld County/Frederick Coordinated Planning Agreement (CPA) area and generally runs north/south parallel to Weld County Road 17 extending from approximately Weld County Road 16'/ to Weld County Road 14. Typically, a 50 -foot permanent easement for the domestic water pipeline and an additional 40 -foot temporary easement for construction has been or is in the process of being purchased from property owners. Please let me know if you have any questions. Thanks, Mark Koleber Thornton Water Project Director City of Thornton 12450 Washington St. Thornton, Colorado 80241-2405 303-255-7790 Ma rk.Kol ebe r@ThorntonCO.gov ***The City of Thornton has changed their domain name, so my email extension is changing. Please change your e-mail address for me in future correspondence to: Mark.Koleber(cz%ThorntonCo. goy. You may see the old extension for a while as the City makes the transition to the new domain name. *** EXHIBIT 12.13a Notice of Inquiry Email Request to Frederick TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-20 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION �I L- c Q. Li Y,_ Notice of Inquiry Weld County 1 Pre -application Case # PRE20-0036 Date of Inquiry 3/13/20 Municipality Frederick CPA Name of Person Inquiring Mark Koleber, Thornton Water Project Director Property Owner Multiple Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungst@weldgov.com Legal Description Multiple Parcel Number Multiple Nearest Intersection Varies Type of Inquiry Water Pipeline The above person met with County Planning staff about developing a parcel of land inside your designated Intergovernmental Agreement/Coordinated Planning Agreement Boundary. i,)0..,\.0 c. 1.;<Z,`;'I'''., �. County Planner's signature Would you like to pursue annexation of this property? NO YES Date of Contact Comments: Signature of Municipality Representative Title Date Please sign and date to acknowledge that the applicant has contacted you and return this signed form to Weld County Department of Planning Services. Weld County Planning Department 1555 N 17th Ave, Greeley, CO 80631 — (970) 400-6100 — (970) 304-649f3 Fax 20181107 EXHIBIT 12.13.b Notice of Inquiry Email Request Attachment to Frederick TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-21 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION From: Mark Koleber <Mark.Koleber@cityofthornton.net> Sent: Wednesday, April 1, 2020 12:42 PM To:'planning@townofjohnstown.com' <planning@townofjohnstown.com> Cc: Henry, Jody/DEN <Jody.Henry@jacobs.com> Subject: [EXTERNAL] Weld County Notice of Inquiry - Thornton Water Project Attachments: Johnstown NOI Form.pdf TW P_W el d_County_Al ign me nt.p d f Ms. Meyer, As requested by Weld County, Thornton is contacting municipalities regarding Thornton's USR permit application to construct a 42 -inch domestic water pipeline and appurtenances in unincorporated Weld County, and is specifically contacting you regarding construction on properties within the town of Johnstown's Three (3) Mile Area. A map showing the TWP alignment is attached. Per Weld County Code, Weld County is required to notify affected jurisdictions as indicated in Coordinated Planning Agreements. As requested by Weld County, Thornton is providing the attached Notice of Inquiry form. Please review and sign the attached form and return it to me, and I'll provide it to Weld County. The city of Thornton (Thornton) is currently developing a Weld County Use by Special Review (USR) Supplemental Permit Application for the Thornton Water Project (TWP), which includes up to approximately 33.9 miles of buried 42 -inch domestic water transmission pipeline and associated appurtenances in unincorporated Weld County. The Supplemental Permit Application will supplement Thornton's Use by Special Review permit application that was previously submitted to Weld County fora segment of the TWP, Permit Application Segment 1. The Supplemental Permit Application will include new information, information that was previously submitted, and revisions to information that was previously submitted. Thornton plans on submitting this supplemental application soon. The water pipeline alignment for the TWP is within the within the town of Johnstown's Three (3) Mile Area extending from approximately Weld County Road 56 to Weld County Road 34 and generally runs north/south as follows: • Weld County Road 56 to Weld County Road 50: The water pipeline generally parallels'/= mile east of Weld County Road 13 for approximately 1 mile then transitions west and enters into the Town of Johnstown for approximately 3.7 miles where it generally follows road right of way and property lines in between Weld County Road 13 and Weld County Road 15. • Weld County Road 44 to Weld County Road 34: The water pipeline transitions out of the Town of Johnstown near Weld County Road 44 and parallels Weld County Road 15 for approximately 1 mile to Weld County Road 42, then transitions east for a pproximately 1/2 mile then south and generally parallels Weld County Road 15'/ to Weld County Road 34. Typically, a 50 -foot permanent easement for the domestic water pipeline and an additional 40 -foot temporary easement for construction has been or is in the process of being purchased from property owners. A 40 million gallon per day pump station is located within the CPA area approximately'/2 mile east of Weld County Road 13 on the south side and adjacent to Weld County Road 50. That appurtenance will include an approximate 3 acre site. Thanks, Mark Koleber Thornton Water Project Director City of Thornton 12450 Washington St. Thornton, Colorado 80241-2405 303-255-7790 Mark.KoleberLa7ThorntonCO.gov * * * The City of Thornton has changed their domain name, so my email extension is changing. Please change your e-mail address for me in future correspondence to: Mark.Koleber@ThonttonCo.gov. You may see the old extension for a while as the City makes the transition to the new domain name. *** EXHIBIT 12.14a Notice of Inquiry Email Request to Johnstown TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-22 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION y-'•�1 `' ° c. , i ti n Notice of Inquiry Weld County Pre-applicalion Case # PRE20-0036 Date of Inquiry 3113/20 Municipality Johnstown CPA Name of Person Inquiring Mark Koleber, Thornton Water Project Director Property Owner Multiple Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungsl@weldgov.com Legal Description Multiple Parcel Number Multiple Nearest Intersection Varies Type of Inquiry Water Pipeline The above person met with County Planning staff about developing a parcel of land inside your designated Intergovernmental Agreement/Coordinated Planning Agreement Boundary. County Planner's signature Would you Ike to pursue annexation of this property? NO YES Date of Contact Comments: Signature of Municipality Representative Title Date Please sign and date to acknowledge that the applicant has contacted you and return this signed form to Weld County Department of Planning Services. Weld County Planning Department 1555 N 17th Aye, Greeley, CO 80631 - (9 70) 400-6100 - (970) 3O4-6498 Fax 20181107 EXHIBIT 12.14b Notice of Inquiry Email Request Attachment to Johnstown TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-23 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION From: Mark Koleber <Mark.Koleber@cityofthornton.net> Sent: Friday, March 20, 2020 4:06 PM To: 'ckennedy@townofinead.org' <ckennedy@townofinead.org> Cc: Henry, Jody/DEN <Jody.Henry@jacobs.com> Subject: [EXTERNAL] Weld County Notice of Inquiry - Thornton Water Project Attachments: Mead NOI Form.pdf TWP_Weld_County_Alignment.pdf Mr. Kennedy, As requested by Weld County, Thornton is contacting municipalities regarding Thornton's USR permit application to construct a 42 -inch domestic water pipeline and appurtenances in unincorporated Weld County, and is specifically contacting you regarding construction on properties within the town of Mead's Three (3) Mile Area. A map showing the TWP alignment is attached. Per Weld County Code, Weld County is required to notify affected jurisdictions as indicated in Coordinated Planning Agreements. As requested by Weld County, Thornton is providing the attached Notice of Inquiry form. Please review and sign the attached form and return it to me, and I'll provide it to Weld County. The city of Thornton (Thornton) is currently developing a Weld County Use by Special Review (USR) Supplemental Permit Application for the Thornton Water Project (TWP), which includes up to approximately 33.9 miles of buried 42 -inch domestic water transmission pipeline and associated appurtenances in unincorporated Weld County. The Supplemental Permit Application will supplement Thornton's Use by Special Review permit application that was previously submitted to Weld County for a segment of the TWP, Permit Application Segment 1. The Supplemental Permit Application will include new information, information that was previously submitted, and revisions to information that was previously submitted. Thornton plans on submitting this supplemental application soon. The water pipeline alignment for the TWP is within the Weld County/Mead Coordinated Planning Agreement area extending from approximately Weld County Road 44 to Weld County Road 24 and generally runs north/south as follows: • Weld County Road 44 to h mile north of State Highway 66: The water pipeline transitions out of the Town of Johnstown near Weld County Road 44 and parallels Weld County Road 15 for approximately 1 mile to Weld County Road 42, then transitions east for approximately 1/2 mile then south and generally parallels Weld County Road 15'/= to'/= mile north of State Highway 66. • % mile north of State Highway 66 to Weld County Road 28: The water pipeline generally runs north/south parallel to Weld County Road 17. • Weld County Road 28 to Weld County Road 24: The water pipeline generally runs north/south parallel to Weld County Road 17, within 1/4 mile east of Weld County Road 17. Typically, a 50 -foot permanent easement for the domestic water pipeline and an additional 40 -foot temporary easement for construction has been or is in the process of being purchased from property owners. Please let me know if you have any questions. Thanks, Mark Koleber Thornton Water Project Director City of Thornton 12450 Washington St. Thornton, Colorado 80241-2405 303-255-7790 Mark.Koleber@ThorntonCO.gov ***The City of Thornton has changed their domain name, so my email extension is changing. Please change your e-mail address for me in fixture correspondence to: Mar1:.Koleber(c`iJThorntonCo. gov. You may see the old extension for a while as the City makes the transition to the new domain name. *** EXHIBIT 12.15a Notice of Inquiry Email Request to Mead TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-24 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION `y'86�-, Notice of Inquiry Weld County Pre -application Case # PRE20-0036 Date of Inquiry 3/13/20 Municipality Mead CPA Name of Person Inquiring Mark Koleber, Thornton Water Project Director Property Owner Multiple Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungst@weldgov.com Legal Description Multiple Parcel Number Multiple Nearest Intersection Varies Type of Inquiry Water Pipeline The above person met with County Planning staff about developing a parcel of land inside your designated Intergovernmental Agreement/Coordinated PlanniIng Agreement Boundary. � � 1 �,1/4 , l_ . i� C,y ,' County Planner's signature Would you Ike to pursue annexation of this property? NO YES Date of Contact Comments. Signature of Municipality Representative Title Date Please sign and date to acknowledge that the applicant has contacted you and return this signed form to Weld County Department of Planning Services. Weld County Planning Department 1555 N 17th Aye, Greeley, CO 80631 -- (9 70) 400-6100 — (970) 3O4-6498 Fax 20981107 EXHIBIT 12.15b Notice of Inquiry Email Request Attachment to Mead TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-25 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION From: Mark Koleber <Mark.Koleber@cityofthornton.net> Sent: Friday, March 20, 2020 4:07 PM To: 'PMcclenahan@MillikenCD.gov' <PMcclenahan@MillikenCO.gov> Cc: Henry, Jody/DEN <Jody.Henry@jacobs.com> Subject: [EXTERNAL] Weld County Notice of Inquiry - Thornton Water Project Attachments: Milliken NOI Farm.pdf TWP_Weld_County_Alignment.pdf Ms. McClenahan, As requested by Weld County, Thornton is contacting municipalities regarding Thornton's USR permit application to construct a 42 -inch domestic water pipeline and appurtenances in unincorporated Weld County, and is specifically contacting you regarding construction on properties within the town of Milliken's Three (3) Mile Area. A map showing the TWP alignment is attached. Per Weld County Code, Weld County is required to notify affected jurisdictions as indicated in Coordinated Planning Agreements. As requested by Weld County, Thornton is providing the attached Notice of Inquiry form. Please review and sign the attached form and return it to me, and I'll provide it to Weld County. The city of Thornton (Thornton) is currently developing a Weld County Use by Special Review (USR) Supplemental Permit Application for the Thornton Water Project (TWP), which includes up to approximately 33.9 miles of buried 42 -inch domestic water transmission pipeline and associated appurtenances in unincorporated Weld County. The Supplemental Permit Application will supplement Thornton's Use by Special Review permit application that was previously submitted to Weld County for a segment of the TWP, Permit Application Segment 1. The Supplemental Permit Application will include new information, information that was previously submitted, and revisions to information that was previously submitted. Thornton plans on submitting this supplemental application soon. The water pipeline alignment for the TWP is within the Weld County/Milliken Coordinated Planning Agreement (CPA) area extending from approximately State Highway 34 to Weld County Road 32 and generally runs north/south as follows: • State Highway 34 to Weld County Road 50: The water pipeline generally parallels Weld County Road 13 within % mile east of Weld County Road 13 for approximately 4 miles then transitions west and enters into the Town of Johnstown for approximately 3.7 miles. • Weld County Road 44 to Weld County Road 32: The water pipeline transitions out of the Town of Johnstown near Weld County Road 44 and parallels Weld County Road 15 for approximately 1 mile to Weld County Road 42, then transitions east for approximately 1/2 mile then south and generally parallels Weld County Road 15'/2 to Weld County Road 32. Typically, a 50 -foot permanent easement for the domestic water pipeline and an additional 40 -foot temporary easement for construction has been or is in the process of being purchased from property owners. A 40 million gallon per day pump station is located within the CPA area approximately mile east of Weld County Road 13 on the south side and adjacent to Weld County Road 50. That appurtenance will include an approximate 3 acre site. Please let me know if you have any questions. Thanks, Mark Koleber Thornton Water Project Director City of Thornton 12450 Washington St. Thornton, Colorado 80241-2405 303-255-7790 Mark.Koleber@ThorntonCO.gov • The City of Thornton has changed their domain name, so my email extension is changing. Please change your e-mail address for me in future correspondence to: Mark.Koleher a.ThorntonCo.gov. You may see the old extension for a while as the City makes the transition to the new domain name. *** EXHIBIT 12.16a Notice of Inquiry Email Request to Milliken TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-26 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION ,y. �� I Notice of Weld County Inquiry ,J GC',-,. t Pre -application Case # PRE20-0036 Date of Inquiry 3/13/20 Municipality Milliken CPA Name of Person Inquiring Mark Koleber, Thornton Water Project Director Property Owner Multiple Planner Diana Aungsl Planner Phone Number 970-400 3524 Planner Email Address daungst@weldgov.com Legal Description Multiple Parcel Number Multlpie Nearest Intersection Varies Type of Inquiry Water Pipeline The above person met with County Planning staff about developing a parcel of land inside your designated Intergovernmental Agreement/Coordinated Planning Agreement Boundary. County Planner's signature Would you like to pursue annexation of this property? NO YES Date of Contact Comments: Signature of Municipality Representative Title Date Please sign and date to acknowledge that the applicant has contacted you and return this signed form to Weld County Department of Planning Services. Weld County Planning Department 1555 N 17th Ave, Greeley, CO 80631 — (970) 400-6100 — (970) 304-6498 Fax 20181107 EXHIBIT 12.16b Notice of Inquiry Email Request Attachment to Milliken TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-27 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION From: Mark Koleber <Mark.Koleber@cityofthornton.netb Sent: Friday, March 20, 2020 4:07 PM To: Itrenken@plattevillegov.org' <trenken@plattevillegov.org> Cc: Henry, Jody/DEN <Jody.Henry@jacobs.com> Subject: [EXTERNAL] Weld County Notice of Inquiry -Thornton Water Project Attachments: Platteville NCI Form.pdf TWP_Weld_County_Alignment.pdf Mr. Renken, As requested by Weld County, Thornton is contacting municipalities regarding Thornton's USR permit application to construct a 42 -inch domestic water pipeline and appurtenances in unincorporated Weld County, and is specifically contacting you regarding construction on properties within the town of Platteville's Three (3) Mile Area. A map showing the TWP alignment is attached. Per Weld County Code, Weld County is required to notify affected jurisdictions as indicated in Coordinated Planning Agreements. As requested by Weld County, Thornton is providing the attached Notice of Inquiry form. Please review and sign the attached form and return it to me, and I'll provide it to Weld County. The city of Thornton (Thornton) is currently developing a Weld County Use by Special Review (USR) Supplemental Permit Application for the Thornton Water Project (TWP), which includes up to approximately 33.9 miles of buried 42 -inch domestic water transmission pipeline and associated appurtenances in unincorporated Weld County. The Supplemental Permit Application will supplement Thornton's Use by Special Review permit application that was previously submitted to Weld County fora segment of the TWP, Permit Application Segment 1. The Supplemental Permit Application will include new information, information that was previously submitted, and revisions to information that was previously submitted. Thornton plans on submitting this supplemental application soon. The water pipeline alignment for the TWP is within the Weld County/Platteville Coordinated Planning Agreement area extending from approximately Weld County Road 38 to Weld County Road 24 and generally runs north/south as follows: • Weld County Road 38 to State Highway 66: The water pipeline generally parallels Weld County Road 151,4 then transitions east to Weld County Road 17. • State Highway 66 to Weld County Road 24: The water pipeline generally parallels Weld County Road 17. Typically, a 50 -foot permanent easement for the domestic water pipeline and an additional 40 -foot temporary easement for construction has been or is in the process of being purchased from property owners. Please let me know if you have any questions. Thanks, Mark Koleber Thornton Water Project Director City of Thornton 12450 Washington St. Thornton, Colorado 80241-2405 303-255-7790 Mark.Koleber@ThorntonCO.gov ***The City of Thornton has changed their domain name, so my email extension is changing. Please change your e-mail address for me in future correspondence to: Mark.Koleber!a..ThorntonCo.gov. You may soe the old extension for a while as the City makes the transition to the new domain name. * ** EXHIBIT 12.17a Notice of Inquiry Email Request to Platteville TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-28 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION ,...*?...E1§,:..... *'� Notice of Inquiry Weld County J L< CcL:N%V Pre -application Case # PRE20-0036 Date of Inquiry 3/13/20 Municipality Platteville CPA Name of Person Inquiring Mark Koleber, Thornton Water Project Director Property Owner Multiple Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungst@weldgov.com Legal Description Multiple Parcel Number Multiple Nearest Intersection Varies Type of Inquiry Water Pipeline The above person met with County Planning staff about developing a parcel of land inside your designated Intergovernmental (Agreement/Coordinated Planning Agreement Boundary. v \ ( t i. �. ��) r . County Planner's signature Would you like to pursue annexation of this property? NO YES Date of Contact Comments: Signature of Municipality Representative Title Date Please sign and date to acknowledge that the applicant has contacted you and return this signed form to Weld County Department of Planning Services. Weld County Planning Department 1555 N 17th Aye, Greeley, CO 80631 — (970) 400-6100 — (970) 804-6498 Fax 20181107 EXHIBIT 12.17b Notice of Inquiry Email Request Attachment to Platteville TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-29 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION From: Mark Koleber <Mark.Koleber@cityofthornton.net> Sent: Friday, March 20, 2020 4:07 PM To:'mnelson@towrofseverance.org' cm nelson@townofseverance.org> Cc: Henry, Jody/DEN <Jody.Henry@jacobs.com> Subject: [EXTERNAL] Weld County Notice of Inquiry -Thornton Water Project Attachments: Severance NOI Form.pdf TW P_Wel d_County_Ali gn me n t. pd f Mr. Nelson, As requested by Weld County, Thornton is contacting municipalities regarding Thornton's USR permit application to construct a 42 -inch domestic water pipeline and appurtenances in unincorporated Weld County, and is specifically contacting you regarding construction on properties within the town of Severance's Three (3) Mile Area. A map showing the TWP alignment is attached. Per Weld County Code, Weld County is required to notify affected jurisdictions as indicated in Coordinated Planning Agreements. As requested by Weld County, Thornton is providing the attached Notice of Inquiry form. Please review and sign the attached form and return it to me, and I'll provide it to Weld County. The city of Thornton (Thornton) is currently developing a Weld County Use by Special Review (USR) Supplemental Permit Application for the Thornton Water Project (TWP), which includes up to approximately 33.9 miles of buried 42 -inch domestic water transmission pipeline and associated appurtenances in unincorporated Weld County. The Supplemental Permit Application will supplement Thornton's Use by Special Review permit application that was previously submitted to Weld County for a segment of the TWP, Permit Application Segment 1. The Supplemental Permit Application will include new information, information that was previously submitted, and revisions to information that was previously submitted. Thornton plans on submitting this supplemental application soon. The water pipeline alignment for the TWP is within the Weld County/Severance Coordinated Planning Agreement (CPA) area extending from approximately Weld County Road 88 to State Highway 392 and generally runs north/south parallel to Weld County Road 13. Typically, a 50 -foot permanent easement for the domestic water pipeline and an additional 40 -foot temporary easement for construction has been or is in the process of being purchased from property owners. Please let me know if you have any questions. Thanks, Mark Koleber Thornton Water Project Director City of Thornton 12450 Washington St. Thornton, Colorado 80241-2405 303-255-7790 Mark.Koleber@ThorntonCO.gov ***The City of Thornton has changed their domain name, so my email extension is changing. Please change your e-mail address for me in future correspondence to: Mark.Kolebei@ThomtonCo.goy. You may see the old extension for a while as the City makes the transition to the new domain name. * * * EXHIBIT 12.18a Notice of Inquiry Email Request to Severance TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-30 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION b �-e- 5 Notice of Inquiry Weld County t VCjNil ". Pre -application Case # PRE20-0036 Date of Inquiry 3/13/20 Municipality Severance CPA Name of Person Inquiring Mark Koleber, Thornton Water Project Director Property Owner Multiple Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungst©weldgov.com Legal Description Multiple Parcel Number Multiple Nearest Intersection Varies Type of Inquiry Water Pipeline The above person mei with County Planning staff about developing a parcel of land inside your designated Intergovernmental Agreement/Coordinated Planning Agreement Boundary. - )I'1;—t��.�.1.''''1tj.1. County Planner's signature Would you like to pursue annexation of this property? NO YES Date of Contact Comments: Signature of Municipality Representative Title Date Please sign and date to acknowledge that the applicant has contacted you and return this signed form to Weld County Department of Planning Services. Weld County Planning Department 1555 N 17th Ave, Greeley, CO 606.91 — (970) 400-6100 -- (970) 304-6498 Fax 2a131107 EXHIBIT 12.18b Notice of Inquiry Email Request Attachment to Severance TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-31 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION From: Mark Koleber cMark.Koleber@cityofthornton.net> Sent: Friday, March 20, 2020 4:D6 PM To: 'Matt Blakely' <mblakely@timnathgov.com> Cc: Henry, Jody/DEN <Jody.Henry@jacobs.com> Subject: [EXTERNAL] Weld County Notice of Inquiry -Thornton Water Project Attachments: Timnath NCI Form.pdf TWP_Weld_County_Alignment.pdf Matt, I hope you and your family are well. As requested by Weld County, Thornton is contacting municipalities regarding Thornton's USR permit application to construct a 42 -inch domestic water pipeline and appurtenances in unincorporated Weld County, and is specifically contacting you regarding construction on properties within the town of Timnath's Three (3) Mile Area. A map showing the TWP alignment is attached. Per Weld County Code, Weld County is required to notify affected jurisdictions as indicated in Coordinated Planning Agreements. As requested by Weld County, Thornton is providing the attached Notice of Inquiry form. Please review and sign the attached form and return it to me, and I'll provide it to Weld County. The city of Thornton (Thornton) is currently developing a Weld County Use by Special Review (USR) Supplemental Permit Application for the Thornton Water Project (TWP), which includes up to approximately 33.9 miles of buried 42 -inch domestic water transmission pipeline and associated appurtena nces in unincorporated Weld County. The Supplemental Permit Application will supplement Thornton's Use by Special Review permit application that was previously submitted to Weld County for a segment of the TWP, Permit Application Segment 1. The Supplemental Permit Application will include new information, information that was previously submitted, and revisions to information that was previously submitted. Thornton plans on submitting this supplemental application soon. The water pipeline alignment for the TWP is within the Weld County/Timnath Coordinated Planning Agreement area extending from approximately Weld County Road 90 to Weld County Road 66 and generally runs north/south as follows: • Weld County Road 90 to Weld County Road 84: The water pipeline generally parallels Weld County Road 13, within 0.25 miles east of Weld County Road 13. • Weld County Road 84 to Weld County Road 56: The water pipeline generally parallels Weld County Road 13. Typically, a 50 -foot permanent easement for the domestic water pipeline and an additional 40 -foot temporary easement for construction has been or is in the process of being purchased from property owners. Please let me know if you have any questions. Thanks, Mark Koleber Thornton Water Project Director City of Thornton 12450 Washington St. Thornton, Colorado 80241-2405 303-255-7790 Mark.Koleber@ThorntonCO.gov ***The City of Thornton has changed their domain name, so my email extension is changing. Please change your e-mail address for me in future correspondence to: Marlk.Koleher@ThorntonCo.gov. You may see the old extension for a while as the City makes the transition to the new domain name. *** EXHIBIT 12.19a Notice of Inquiry Email Request to Timnath TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-32 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION . Notice of Inquiry 1rJ 17t'aN — r Y-...--, Weld County Pre -application Case # PRE20-0036 Date of Inquiry 3113/20 Municipality Timnath CPA Name of Person Inquiring Mark Koleber, Thornton Water Project Director Property Owner Multiple Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungst@weldgovcom Legal Description Multiple Parcel Number Multiple Nearest Intersection Varies Type of Inquiry Water Pipeline The above person met with County Planning staff about developing a parcel of land inside your designated Intergovernmental Agreement/Coordinated Planning Agreement Boundary. County Planner's signature Would you like to pursue annexation of this property? NO YES Date of Contact Comments: Signature of Municipality Representative Title Date Please sign and date to acknowledge that the applicant has contacted you and return this signed form to Weld County Department of Planning Services. `Veld County Planning Department 1555 N 1 7th Ave, Greeley, CO 80631 -^- (970) 400-6100 ^- (970) 304-6498 Fax 20181107 EXHIBIT 12.19b Notice of Inquiry Email Request Attachment to Timnath TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-33 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION From: Mark Koleber <Mark.Koleber@cityofthornton.net> Sent: Friday, March 20, 2020 4:06 PM To: sballstadt@windsorgov.com Cc: Henry, Jody/DEN <Jody.Henry@jacobs.com> Subject: [EXTERNAL] Weld County Notice of Inquiry - Thornton Water Project Attachments: Windsor NOI Form.pdf TW P_Weld_County_Alignment.pdf Scott, I hope you and your family are well. As requested by Weld County, Thornton is contacting municipalities regarding Thornton's USR permit application to construct a 42 -inch domestic water pipeline and appurtenances in unincorporated Weld County, and is specifically contacting you regarding construction on properties within the town of Windsor's Three (3) Mile Area. A map showing the TWP alignment is attached. Per Weld County Code, Weld County is required to notify affected jurisdictions as indicated in Coordinated Planning Agreements. As requested by Weld County, Thornton is providing the attached Notice of Inquiry form. Please review and sign the attached form and return it to me, and I'll provide it to Weld County. The city of Thornton (Thornton) is currently developing a Weld County Use by Special Review (USR) Supplemental Permit Application for the Thornton Water Project (TWP), which includes up to approximately 33.9 miles of buried 42 -inch domestic water transmission pipeline and associated appurtenances in unincorporated Weld County. The Supplemental Permit Application will supplement Thornton's Use by Special Review permit application that was previously submitted to Weld County for a segment of the TWP, Permit Application Segment 1. The Supplemental Permit Application will include new information, information that was previously submitted, and revisions to information that was previously submitted. Thornton plans on submitting this supplemental application soon. The water pipeline alignment for the TWP is within the Weld County/Windsor Coordinated Planning Agreement area extending from approximately Weld County Road 84 to Weld County Road 52 and generally runs north/south as follows: • Weld County Road 84 to State Highway 34: The water pipeline generally parallels Weld County Road 13 then transitions east to Weld County Road • State Highway 34 to Weld County Road 52: The water pipeline generally parallels Weld County Road 13'/:. Typically, a 50 -foot permanent easement for the domestic water pipeline and an additional 40 -foot temporary easement for construction has been or is in the process of being purchased from property owners. Please let me know if you have any questions. Thanks, Mark Koleber Thornton Water Project Director City of Thornton 12450 Washington St. Thornton, Colorado 80241-2405 303-255-7790 Mark.Koleber@ThorntonCO.gov *The City of Thornton has changed their domain name, so my email extension is changing. Please change your e-mail address for me in future correspondence to: Mark.Koleber@ahomtonCo.gov. You may see the old extension for a while as the City makes the transition to the new domain name. *** EXHIBIT 12.20a Notice of Inquiry Email Request to Windsor TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-34 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION lil c r� J..., ; Y Notice of Inquiry Weld County Pre -application Case It PRE20-0036 Date of Inquiry 3/13/20 Municipality Windsor CPA Name of Person Inquiring Mark Koleber, Thornton Water Project Director -- Property Owner Multiple Planner Diana Aungst Planner Phone Number 970-400-3524 Planner Email Address daungst@weldgov.com Legal Description Multiple Parcel Number Multiple Nearest Intersection Varies Type of Inquiry Water Pipeline The above person met with County Planning staff about developing a parcel of land inside your designated Intergovernmental Agreement/Coordinated Planning Agreement Boundary. 7 \s: v t ! .l 1 t'A (..4 ' County Planner's signature Would you like to pursue annexation of this property? NO YES Date of Contact Comments: Signature of Municipality Representative Title Date Please sign and date to acknowledge that the applicant has contacted you and return this signed form to Weld County Department of Planning Services. Weld County Planning Department 1555 N 17th Ave, Greeley, CO 80631 — (97O) 4OO-61OO - (97O) 3O4-6498 Fax 20181107 EXHIBIT 12.20b Notice of Inquiry Email Request Attachment to Windsor TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-35 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON. CO 80241-2405 3/19:2020 Thornton Water Project TWP Weld County Alignment Map Booster Pump Station 1 f FIRf• S (ONE 1 Pump Station TWP Alignment in Unincorporated Wend County TWP Alignment outside Unncotporated Weld County Railroad --- County Boundary R,verrStrearnuC analntch ; L3ke/Resen-or EVANS "LA SALLE 4 EXHIBIT 12.21 Notice of Inquiry Email Request Attachment for All Requests TWP USR SUPPLEMENT 2 SECTION 12 NOTICE OF INQUIRY, IF APPLICABLE 12-36 Section 13 Pre -application Meeting Minutes This section addresses Procedural Guide Checklist, pre -application meeting minutes. See attached pre -application meeting minutes developed and provided by Weld County behind this page for meetings held on May 27, 2016, August 25, 2016, January 17, 2019, and March 13, 2020. TWP USR SUPPLEMENT 2 SECTION 13 PRE -APPLICATION MEETING MINUTES 13-1 Technician MEMORANDUM TO: PRE16-0083; Case File, pre -application DATE: May 26, 2016 FROM: Kris Ranslem, Planning SUBJECT: Pre -Application Meeting prior to submitting USR for water transmission lines. Attendees: Mark Koleber, City of Thornton John Himyak, City of Thornton Lyndsay Massey, Public Works Jody Henry, CH2MHILL Gerald Simpson, CH2MH ILL Antonio Esposito, CH2MHILL Diana Aungst, Planning Hayley Brown, Engineering Lyndsay Massey, Public Works Kris Ranslem, Planning Michelle Martin, Planning On Thursday, May 26, 2016 an informal discussion took place at the Greeley Administrative Offices Conference Room regarding a proposed water conveyance infrastructure. (The legal description are multiple Sections in T1 -8N, R67W of the 6th P.M.) Background Information: The Thornton Water Project will convey Thornton's decreed raw water from the Water Supply and Storage Company system to Thornton. The project includes approximately 50 miles of buried pipeline and appurtenant facilities. The pipeline will traverse multiple properties in Weld County. The current intent is to obtain permanent easements for the buried pipeline from private property owners for construction in unincorporated Weld County. There would be 50 foot easements with an additional 40 feet easement for temporary construction. Total construction will take approximately 4-5 years. The applicants are proposing to submit the project as a corridor alignment (quarter mile) rather than specific alignments. Planning Department Staff urged the applicant to contact staff for any questions: Planner On Call available Monday through Friday 7:30 a.m. to 4:30 p.m. or contact Diana Aungst at 970-400- 3524 or daungst@weldgov cam Planning staff went over the proposed water pipeline code changes with the applicant and the USR criteria. The above notes are provided as a courtesy to the applicant. While we strive to help identify as many potential issues upfront during the pre application meeting we cannot anticipate every issue that may come up during the formal application process. The information contained herein has been placed on file with the Department of Planning Services. The pre -application is valid for a period of one (1) year from the date of pre - 1 -2 application. If a formal application is not received following the time period specified herein the Planning Department reserves the right to require a new pre -application meeting. Please note that all land use, building and impact fees are subject to change throughout this time period. End memorandum. 1-3 MEMORANDUM TO: PRE16-0083; Case File, pre -application DATE: August 25, 2016 FROM: Kris Ranslem, Planning Technician SUBJECT: Pre -Application Meeting prior to submitting USR for water transmission lines Attendees: Mark Koleber, City of Thornton John Himyak, City of Thornton Jody Henry, CH2MHILL Gerald Simpson, CH2MH ILL Antonio Esposito, CH2MHILL Diana Aungst, Planning Hayley Brown, Engineering Kris Ranslem, Planning Michelle Martin, Planning On Thursday, August 25, 2016 an informal discussion took place at the Greeley Administrative Offices Conference Room regarding a proposed water conveyance infrastructure. (The legal description are multiple Sections in T1 -8N, R67W of the 6th P.M.) Background Information: The Thornton Water Project will convey Thornton's decreed raw water from the Water Supply and Storage Company system to Thornton. The project includes approximately 50 miles of buried pipeline and appurtenant facilities. The pipeline will traverse multiple properties in Weld County. The current intent is to obtain permanent easements for the buried pipeline from private property owners for construction in unincorporated Weld County. There would be 50 foot easements with an additional 40 feet easement for temporary construction. Total construction will take approximately 4-5 years and intend to deliver water by 2025. The applicants were proposing to submit the project as a corridor alignment (quarter mile) rather than specific alignments. After discussion with the Board of County Commissioners, they were directed to propose a specific alignment rather than a corridor alignment. Therefore, the applicants are proposing to break the project up into three segments. The 1St Phase would include the pipeline from Adams County to St. Vrain Creek. The 2nd Phase would include the pipeline up to just north of Johnstown and the 3rd Phase would be from north of Johnstown to where it turns west to go into Larimer County. Phase 1 would also include one booster pump station and a water tank is proposed to be included in Phase 3. Building Department Commercial Building Permits will be required, per Section 29-3-10 of the Weld County Code. Currently the following has been adopted by Weld County: 2012 International Codes; 2006 International Energy Code; 2014 National Electrical Code. A building permit application must be completed and two complete sets of engineered plans bearing the wet stamp of a Colorado registered architect or engineer must be submitted for review. A geotechnical engineering report or an open -hole inspection report performed by a registered State of Colorado engineer may be required for new structures and or additions. 1-4 A Fire District Notification letter may be required and shall be submitted with Commercial Permit applications. All building permit requirements can be found on the Weld County web -site: http://www.co weld co.us/Departmerts/BuildirciDepartment/BuildinqPermits/Commercial.html. Health Department Staff was unavailable; however please contact Lauren Light at 970-304-6415 ext. 2211 for further direction. Waste handling: Waste materials shall be handled, stored, and disposed in a manner that controls blowing debris, and other potential nuisance conditions. The applicant shall operate in accordance with Chapter 14, Article 1 of the Weld County Code. Onsite dust: Fugitive dust should attempt to be confined on the property. Uses on the property should comply with the Colorado Air Quality Commission's air quality regulations. Sewage disposal information: Include in application how sewage disposal will be accommodated. If using a septic system provide a copy of the septic permit. Either utilize the County website http://www.co weld co,usIDepartments!Assessor!PropertylnformationPortal,html or call (970-304-6415) or stop by EH front counter and request a copy. Potable water information: Include in application how potable water will be provided. Provide a will serve letter or water bill from the water district or provide a copy of well permit. Portable toilets and Bottled water can be used for employees and customers per policy below: TO DEFINE WHEN PORTABLE TOILETS AND COMMERCIALLY BOTTLED WATER ARE ALLOWED Purpose: To define when portable toilets and commercially bottled water are allowed. Policy: Bottled water from a commercial source is allowed in the following circumstances: 1. Temporary or seasonal uses that are utilized 6 months or less per year (for example recreational facilities, firework stands, farmers markets ) 2. Gravel mines 3. 10 or less customers or visitors per day And/or one of the following: 4. 2 or less full time (40 hour week) employees located on site 5. 4 or less part time (20 hour week) employees located on site 6. Employees or contractors that are on site for less than 2 consecutive hours a day Policy: portable toilets are allowed in the following circumstances: 1. Temporary or seasonal uses that are utilized 6 months or less per year (for example recreational facilities, firework stands, farmers markets ) 2. Gravel mines 3. 10 or less customers or visitors per day And/or one of the following: 4. 2 or less full time (40 hour week) employees located on site 5. 4 or less part time (20 hour week) employees located on site 6. Employees or contractors that are on site for less than 2 consecutive hours a day Public Works Staff was unavailable; however, please contact staff below for further direction: Access Permits: Morgan Gabbert mgabbert@co.weld.co.us 970-400-3778 Improvements Agreements: Evan Pinkham epinkham@co.weld.co.us 970-400-3727 Traffic Studies: Janet Lundquist ilundquistAco.weld.co.us 970-400-3726 Right -of -Way: Tiffane Johnson tvjohnson@weldoov.co us 970-400-3766 1-5 CR 2 is owned and maintained by the County of Adams. The municipality has jurisdiction over all accesses within their jurisdiction. Please contact municipality to verify the access permit or for any additional requirement that may be needed to obtain or upgrade the permit. A Site Plan will be required identifying the following (if applicable): o Show and label location of existing road Right -of -Way, future road Right -of -Way, and Easements o Show and label the unmaintained section line Right -of -Way o Show and label location of the access(es) and label with access permit number o Show and label the access turning radii (25 feet for passenger vehicles/60 feet for trucks) o Show and label the approved tracking control ENGINEERING DEPARTMENT DRAINAGE REQUIREMENTS: The pipeline itself will meet the pipeline exception. Pump stations, water tanks, and other facilities will not meet that exception. Weld County has recently adopted a new stormwater drainage code located under Chapter 23, Article 12 Storm Drainage Criteria. A list of professional engineering consultants is available if you need help finding an engineer to assist you with your project at the following link http://www.co.weld co usiDepartments/PlanninqZoninq/Enqineerinq.html. Please contact the Department of Planning Services/Development Review Engineering for questions or assistance 970-353-6100. This area IS within an Urbanizing Drainage Area: Require detention of runoff from the 1 -hour, 100 -year, storm falling on the developed site and release of the detained water at the historic runoff rate of the 1 -hour, 5 -year storm falling on the undeveloped site for URBANIZING areas. This area IS within a Non -Urbanizing Drainage Area: Require detention of runoff from the 1 -hour, 100 -year, storm falling on the developed site and release of the detained water at the historic runoff rate of the 1 -hour, 10 -year storm falling on the undeveloped site for NON - URBANIZING areas. Detention pond summarized in a drainage report is required unless the project falls under an exception to stormwater detention requirements per code section 23-12-30 F.1. To avoid holding up case processing, a minimum of either a preliminary drainage report or a drainage narrative with exception as shown below must be submitted with 7 -day case submittal information. 1. Drainage narrative requirements with exception from detention pond. The drainage narrative must describe at the minimum: 1. Which exception is being applied for and include supporting documentation. 2. Where the water originates if it flows onto the property from an offsite source 3. Where it flows to as it leaves the property 4. The direction of flow across the property 5. If there have been previous drainage problems with the property DRAINAGE CODE REQUIREMENTS (informational only): Section 23-12-30. Drainage Policy. F. Exceptions. 1. EXCEPTIONS TO STORMWATER DETENTION SHALL NOT JEOPARDIZE THE PUBLIC HEALTH, SAFETY, AND WELFARE OF PUBLIC AND PRIVATE PROPERTY AND SHALL BE LIMITED TO THE FOLLOWING: a. No stormwater detention will be required for sites that meet any of the following conditions. Requirements of the Municipal Separate Storm Sewer System (MS4) areas remain applicable. 1) Use by Right or Accessory Use in the A (Agricultural) Zone District. 2) Zoning Permits in the A (Agricultural) Zone District. 3) A second dwelling permit in the A (Agricultural) Zone District. 1-6 4) Towers including, but not limited to, cell: wind, and telecommunication towers. 5) Pipelines or transmission lines. 6) Gravel pits if the stormwater drains into the gravel pit. 7) Residential developments where all the following conditions exist: A) Nine (9) lots or fewer. B) The average lot size is equal to, or greater than, three (3) acres per lot. C) Downstream roadway criteria are not exceeded. D) The total post -development imperviousness for the rural residential development does not exceed ten percent (10%), assuming that all internal roads and driveways are paved: or will eventually be paved. 8) Development of sites where the change of use does not increase the imperviousness of the site. 9) URBANIZING areas where the total project stormwater runoff of less than, or equal to, 5 cubic feet per second (cfs) for the 1 -hour: 100 -year, storm event. 10) NON -URBANIZING areas where the total project stormwater runoff of less than: or equal to, 10 cfs for the 1 -hour, 100 -year, storm event. 11) Parcels with total area less than, or equal to, a 1.0 gross acre. 12) Individual parcel with an unobstructed flow path and no other parcel(s) between the Federal Emergency Management Administration (FEMA) regulatory floodplain channel and the project. 13) A parcel greater than 1 gross acre and less than, or equal to, 5 gross acres in size is allowed a onetime exception for a new 1,000 sq ft building or equivalent imperviousness. 14) A parcel greater than 5 gross acres in size is allowed a onetime exception for a new 2,000 sq ft building or equivalent imperviousness. 15) Approved by a variance. The applicants will be required to maintain the historic drainage flows and run-off amounts that exist from the property. This site is located within the Municipal Separate Storm Sewer System (MS4) boundary. These areas are more urbanized or urbanizing with state mandated, higher water quality requirements. Projects that are within the MS4 area that disturb greater than or equal to 1 acre; or projects less than 1 acre that are part of a larger common plan of development or sale; require an approved water quality design. Questions pertaining to the MS4 requirements should be directed to the Public Works Department 970-304-6496. A "common plan of development or sale" is a contiguous area where multiple separate and distinct construction activities may be taking place at different times on different schedules, but remain related. Consistent with EPA guidance, "contiguous" is interpreted to mean construction activities located in close proximity to each other (within'/ mile). Construction activities are considered to be "related" if they share the same development plan, builder or contractor, equipment, storage areas, etc. Portions of the alignment may be located in a designated FEMA floodplain. Flood Hazard Development Permits will be required. Please show and label the floodplain boundaries and the FEMA Flood Zone and FEMA Map Panel Number on the plat. Contact the Floodplain Administrator, Diana Aungst, at 970-353-6100 ext. 3524 to discuss your project. If more than 1 acre is to be disturbed for construction of non pipeline or non -gravel pit items such as structures, parking lots, laydown yards etc..., a Weld County Grading Permit will be required prior to the start of construction. This site IS in a Geologic Hazard Area. The Colorado Geologic Society will be a referral agency. A geologic hazard permit may be required. The Colorado Geologic Survey (CGS) has expertise in geologic hazard areas and is a referral agency for this project. Contact Jill Carlson with the CGS at 303-384-2643 for more detailed information on the geologic hazards in your project area and any additional requirements that may be needed. Depth to mine A Site Plan will be required identifying the following (if applicable): 1-7 o Show and label location of drainage related features i.e. detention pond(s), ditches, etc... Detention ponds shall be labeled as "No Build/Storage Area" and include design volume o Show and label the drainage flow arrows showing how the stormwater flows across the property o Show and label the parking and traffic circulation flow arrows showing how the traffic moves around the property o Show and label the location of any floodplain boundaries (include permit number, floodplain type, map panel number and date) o Show and label the location of geological hazard Planning Department Additional fees may be included with the Building Permit such as Road Impact, County Facilities and Drainage fees. Please refer to the handout provided. Weld County has a Coordinated Planning Agreement (CPA) with the Towns/Cities of Fort Lupton, Frederick, Firestone, Dacono, Platteville, Milliken and Mead. The Planning Director will contact the Town Managers for each of these jurisdictions and give notice of this pre -application meeting. Staff advised the applicants to contact these jurisdictions regarding possible land use permitting. Please also contact Dacono and Frederick and have them complete the Notice of Inquiry (NOI). Staff urged the applicant to contact staff for any questions: Planner On Call available Monday through Friday 7:30 a.m. to 4:30 p.m. or contact Diana Aungst at 970-400- 3524 or daungst@weldgov.com The applicant may be eligible for the Small Business Incentive Program (SBIP). Staff provided information regarding the program. Please visit http://www.co weld co.usiDepartments/PlannIngZonIng/SmallBusinessIncentiveProgram.html or contact Michelle Martin at 970-400-3571 or Tom Parko at 970-400-3572, for further direction. Staff provided information on Colorado's Enterprise Zone (EZ) program which provides state income tax credits to encourage businesses to locate/expand in designated economically distressed areas of the state. The Weld County EZ program is administered by Upstate Colorado Economic Development. The pipeline code was recently change to required that all the surrounding property owners within 150 must be notified. Per 23-2-520.7. The signature blocks required are the pipeline owner, the Planning Commission and the BOCC. Staff explained the USR process. The applicant shall submit 1 packet for a 7 day completeness review. After the 7 day completeness review the applicant will be informed of what items are still required to make the application complete. Staff requested that the applicant submit the remaining material in electronic form. Upon submittal of a completed application it will be sent out for referral for 28 days. The applicant will then meet with their Planner to discuss the referrals and address as many of the referrals as possible. At that meeting the Planning Commission hearing will be scheduled. The Board of County Commissioners hearing typically follows approximately 3 weeks after the Planning Commission hearing. The above notes are provided as a courtesy to the applicant. While we strive to help identify as many potential issues upfront during the pre application meeting we cannot anticipate every issue that may come up during the formal application process. The information contained herein has been placed on file with the Department of Planning Services. The pre -application is valid for a period of one (1) year from the date of pre - application. If a formal application is not received following the time period specified herein the Planning Department reserves the right to require a new pre -application meeting. Please note that all land use, building and impact fees are subject to change throughout this time period. End memorandum. 1-8 MEMORANDUM TO: PRE19-0002; Case File, pre -application DATE: January 17, 2019 FROM: Kris Ranslem, Planning Technician SUBJECT: Pre -Application Meeting prior to submitting USR for water transmission pipeline Attendees: Jody Henry, CH2MHILL Diana Aungst, Planning Evan Pinkham, Public Works Elizabeth Relford, Public Works Dawn Anderson, Public Works Kris Ranslem, Planning On Thursday, January 17, 2019 an informal discussion took place at the Greeley Administrative Offices Conference Room regarding a proposed water transmission pipeline. Background Information: The City of Thornton is proposing to construct, operate and maintain a 48 -inch water transmission pipeline for approximately 24 miles in length as well as associated appurtenances in Weld County. This pipeline will be capable of conveying 40 million gallons per day. The pipeline generally runs north/south along CR 17 and extends from just north of Saint Vrain Creek to approximately 0.25 miles south of CR 92. There will be a 1 million gallon above -ground tank located on CR 13, approximately I/2 mile south of CR 92. This will be located adjacent to an existing 500,000 gallon tank. Building Department Staff was unavailable; however please contact Jose Gonzalez at 970-400-3540 for further direction. Building permits may be required, per Section 29-3-10 of the Weld County Code. Currently the following has been adopted by Weld County: 2018 International Residential Code, 2018 International Building Code, 2018 International Mechanical Code, 2018 International Plumbing Code, 2018 International Plumbing Code, 2018 International Fuel Gas Code, 2006 International Energy Conservation Code, and 2017 National Electrical Code. A building permit application must be completed and two complete sets of engineered and architectural plans bearing the wet stamp of a Colorado registered engineer or architect must be submitted for review for each structure. A complete code analysis prepared by a registered design professional is required and shall be submitted with All Commercial Building Permit Applications to Weld County. All new Commercial Building Projects require Fire District Notification (letter or email form). Proof shall be submitted with Commercial Permit applications. Final Fire District Approval is also required prior to issuing a Certificate of Occupancy and or closing a building permit. Building department staff strongly recommends a pre -application building permit submittal meeting, and, or a pre -construction meeting with Building Department staff for an overview of permit requirements. Please call 970-400-6100 and ask for a Plans Examiner. Building permit requirements can be found on the web -site link below: https://www.weldgoy.com/departments/building/building permit/construction handouts more information/ Health Department Staff was unavailable; however please contact Lauren Light at 970-400-2211 for further direction. Waste handling: Waste materials shall be handled, stored, and disposed in a manner that controls blowing debris, and other potential nuisance conditions. The applicant shall operate in accordance with Chapter 14, Article 1 of the Weld County Code. Please answer the following if applicable; indicate if there will be washing of vehicles or equipment, fuel storage, maintenance of vehicles or equipment, floor drains in shop, air emissions permit. Onsite dust: Fugitive dust should attempt to be confined on the property. Uses on the property should comply with the Colorado Air Quality Commission's air quality regulations. Sewage disposal information: Include in application how sewage disposal will be accommodated. If using a septic system provide a copy of the septic permit. Either utilize the County website www.co.weld.co.us/maps/propertyportal/ or call (970-304-6415) or stop by EH front counter and request a copy. Potable water information: Include in application how potable water will be provided. Provide a will serve letter or water bill from the water district or provide a copy of well permit. Portable toilets and Bottled water can be used for employees and customers per policy below: TO DEFINE WHEN PORTABLE TOILETS AND COMMERCIALLY BOTTLED WATER ARE ALLOWED Purpose: To define when portable toilets and commercially bottled water are allowed. Policy: Bottled water from a commercial source is allowed in the following circumstances: 1. Temporary or seasonal uses that are utilized 6 months or less per year (for example recreational facilities, firework stands, farmers markets) 2. Gravel mines 3. 10 or less customers or visitors per day And/or one of the following: 4. 2 or less full time (40 hour week) employees located on site 5. 4 or less part time (20 hour week) employees located on site 6. Employees or contractors that are on site for less than 2 consecutive hours a day Policy: portable toilets are allowed in the following circumstances: 1. Temporary or seasonal uses that are utilized 6 months or less per year (for example recreational facilities, firework stands, farmers markets) 2. Gravel mines 3. 10 or less customers or visitors per day And/or one of the following: 4. 2 or less full time (40 hour week) employees located on site 5. 4 or less part time (20 hour week) employees located on site 6. Employees or contractors that are on site for less than 2 consecutive hours a day Public Works Roads and rights -of -way will be detailed in the USR referral. Per Chapter 12, Article 4, Section 12-4-30.B, a Weld County Right -of -Way Use Permit is required for any project that will be occupying, constructing or excavating facilities within, and/or encroaching upon, any County rights -of -way or easement. Right -of -Way Use Permit instructions and application can be found at https://www.weldgoy.com/departments/publicworks/permits/. Weld County will not replace overlapping easements located within existing right-of-way or pay to relocate existing utilities within the County right-of-way. ACCESS Table 12A.2 Minimum Access Spacing Criteria (Feet) Access Element Arterial Collector Local Distance between intersections Signalized Unsignalized 2,640 1,320 N/A 1,320 N/A 330 Distance between accesses and intersections 660 660 330 Distance between access points 660 330 150 Distance between access points in subdivisions 660 330 75 Per Chapter 12, Article 5, Section 12-5-30, an Access Permit is required for access to Weld County maintained roadways. We strongly encourage you to discuss your access with Public Works prior to laying out your site plan to ensure the approved accesses are compatible with your layout. Per Chapter 12, Article V, Section 12-5-30. F, when feasible, there shall be no net increase in the number of accesses to a public road. Minimum access spacing widths are shown in Weld County Code Appendix Table 12A-2. Please refer to Chapter 12 of the Weld County Code for more information regarding access. As part of the development review process, all new commercial or residential developments will be required to submit a TIS that is prepared, stamped, and signed by a professional engineer licensed in the State of Colorado, unless the TIS is waived by Public Works. A Traffic Impact Study shall be completed by a Colorado Registered Professional Engineer. The engineer will need to follow the checklist available on the Weld County Public Works website at: http://www.weldqov.com/departments/public works/traffic signing/traffic study checklist/. Any required off - site improvements based upon the traffic narrative or the traffic study will be included within the Improvements Agreement. Public Works may require an Improvements Agreement for one or all the following reasons: • Off -Site Public Improvements • Road Maintenance Agreement • Construction Maintenance Agreement • Access Improvements Agreement • On -Site Improvements for Subdivisions/PUDs An Improvements Agreement is required for sites with required offsite improvements per Chapter 12, Article 5, Section 12-5-60. Collateral is required to ensure the improvements are completed, and maintained. Improvements/Road Maintenance Agreement: An example agreement is available at: https://www.weldqov.com/UserFiles/Servers/Server 6/File/Departments/Public%20Works/DevelopmentRevie w/sprusr.pdf. It will detail the approved haul route(s), outline when offsite improvements will be triggered, and include a maintenance agreement for the haul routes. Possible mitigations included in the road maintenance agreement may include but are not limited to: dust control, specified haul routes, damage repairs, and future improvement triggers. The storm drainage criteria is located at: https://library.municode.com/co/weld county/codes/charter and county code?nodeld=CH23ZO ARTXIIS TDRCR A list of professional engineering consultants is available if you need help finding an engineer to assist you with your project at the following link: https://www.weldqov.com/UserFiles/Servers/Server 6/File/Departments/Public°/020Works/DevelopmentR eview/List%20of%20Professional%20Engineering%20Firms.pdf Detention pond summarized in a drainage report is required unless the project falls under an exception to stormwater detention requirements per code section 23-12-30 F.1. To avoid holding up case processing, a minimum of either a preliminary drainage report or a drainage narrative with exception as shown below must be submitted with 7 -day case submittal information. 1. Drainage Narrative requirements with exception from detention pond. The Drainage Narrative must describe at a minimum: i. Which exception is being applied for and include supporting documentation ii. Where the water originates if it flows onto the property from an offsite source iii. Where it flows to as it leaves the property iv. The direction of flow across the property v. If there have been previous drainage problems with the property DRAINAGE CODE REQUIREMENTS (informational only): Section 23-12-30. Drainage Policy. F. Exceptions. Exceptions to stormwater detention shall not jeopardize the public health, safety, and welfare of public and private property and shall be limited to the following: No stormwater detention will be required for sites that meet any of the following conditions. Requirements of the Municipal Separate Storm Sewer System (MS4) areas remain applicable. 5. Pipelines or transmission lines. The applicants will be required to maintain the historic drainage flows and run-off amounts that exist from the property. This site is located in a Municipal Separate Storm Sewer System (MS4) Area which may trigger specific water quality requirements or other drainage improvements. In addition to compliance with applicable Weld County regulations, property owner is required to be compliant with any additional MS4 requirements. Questions pertaining to the MS4 requirements should be directed to Lyndsay Holbrook, in the Public Works Department, at 970-400-3788. If more than 1 acre is to be disturbed for construction of non pipeline or non -gravel pit items such as structures, parking lots, laydown yards etc..., a Weld County Grading Permit will be required prior to the start of construction. Grading Permit applications are accepted after the planning process is complete (map recorded). An Early Release Request Form may be entertained only after the applicant and Planning Department have reviewed the referral and surrounding property owner comments. The Early Release Request may or may not be granted depending on referral comments and surrounding property owner concerns. Contact an Engineering representative from the Planning Department for more information. Application Fees: 1-5 Acres/ $50, 5.1 - 20 Acres/$100, 20.1 Acres or Greater/$200 + $1 per acre over 20. A Site Plan will be required identifying the following (if applicable): o Show and label location of existing road, existing road right-of-way, future road right-of-way, and easements o Show and label the unmaintained section line right-of-way o Show and label location of the access(es) and label with access permit number o Show and label the access turning radii (Residential — 25' Commercial — 60') o Show and label the approved tracking control o Show and label location of drainage related features i.e. detention pond(s), ditches, etc... Detention ponds shall be labeled as "No Build/Storage Area" and include design volume o Show and label the drainage flow arrows showing how the stormwater flows across the property o Show and label the parking and traffic circulation flow arrows showing how the traffic moves around the property Public Works Contact List Access Permits Tiffnee Wertenberger twertenbergergweldgov.com 970-400-3718 Improvements Agreements Tisa Juanicorena tjuanlcorena a©weldgov.com 970-400-3778 Right -of -Way Permits Amy Mutchie am utchieAweldgov.com 970-400-3764 Development Review Hayley Balzano hbalzano@weldgov.com 970-400-3738 Evan Pinkham epinkham@weldgov.com 970-400-3727 Mike McRoberts mmcroberts@weldgov.com 970-400-3798 Planning Department Staff urged the applicant to contact staff for any questions: Planner on Call available Monday through Friday 7:30 a.m. to 4:30 p.m. or contact Diana Aungst at 970-400- 3524 or daungt@weldgov.com Staff explained the USR process. The applicant shall submit 1 packet for a 7 -day completeness review. After the 7 -day completeness review the applicant will be informed of what items are still required to make the application complete. Staff requested that the applicant submit the remaining material in electronic form. Upon submittal of a completed application it will be sent out for referral for 28 days. The applicant will then meet with their Planner to discuss the referrals and address as many of the referrals as possible. At that meeting the Planning Commission hearing will be scheduled. The Board of County Commissioners hearing typically follows approximately 3 weeks after the Planning Commission hearing. The above notes are provided as a courtesy to the applicant. While we strive to help identify as many potential issues upfront during the pre -application meeting we cannot anticipate every issue that may come up during the formal application process. The information contained herein has been placed on file with the Department of Planning Services. The pre -application is valid for a period of one (1) year from the date of pre - application. If a formal application is not received following the time period specified herein the Planning Department reserves the right to require a new pre -application meeting. Please note that all land use, building and impact fees are subject to change throughout this time period. End memorandum. MEMORANDUM TO: PRE20-0036; Case File, pre -application DATE: March 13, 2020 FROM: Kris Ranslem, Planning Technician SUBJECT: Pre -Application Meeting prior to submitting USR application for water transmission pipeline Attendees: Mark Koleber, Thornton Water Project Director Jody Henry, CH2M Hill Gerald Simpson, CH2MHill John Himyak, City of Thornton Antonio Esposito, City of Thornton Lloyd Clements, Building Diana Aungst, Planning Mike McRoberts, Public Works Dawn Anderson, Public Works Evan Pinkham, Public Works Kris Ranslem, Planning On Friday, March 13, 2020 an informal discussion took place at the Greeley Administrative Offices Conference Room regarding a proposed 42 -inch water transmission pipeline. (The legal description is Section Varies, Ti N-TBN, R67W of the 6'" P.M.) Background Information: The City of Thornton proposed a segment of the Thornton Water Project (TWP) at the July 10, 2019 Weld County Board of County Commissioners hearing. The Board of County Commissioners continued the hearing until July 15, 2020 in order for Thornton to respond to 1) obtaining additional easements for the project, 2) Provide information for all segments of the proposed project, and 3) Weld County has a general policy for not allowing pipelines in Weld County right-of-way. The City of Thornton is proposing to construct, operate and maintain the Thornton Water Pipeline (TWP) which includes up to approximately 33.9 miles of buried 42 -inch (reduced from the initial proposal of 48 -inch) domestic water transmission pipeline. The TWP appurtenances include buried valve assemblies, access manways, and fiber optic cable. Other appurtenances include a 1 -million -gallon water tank and 2 booster pump stations. The TWP is a water delivery system that will convey domestic water that Thornton purchased in the mid -1980's. The delivery system will convey water from the Water supply and Storage Company system at WSSC Reservoir no. 4 in unincorporated Larimer County, through Weld County to Thornton. The water pipeline route generally runs north/south outside Weld County right-of-way except at road crossings and extends from CR 92 to CR 2. The 1 -million -gallon water tank site will include an above ground steel tank located south of the intersection of CR 13 and CR 92. This site is next to an existing water tank. The Booster Pump Station 1 site is located approximately 0.5 miles east of the intersection of CR 13 and CR 50. The site will include a pump house building and equipment pads outside of the building. The Booster Pump Station 2 site is located approximately 0.2 miles north of the intersection of CR 17 and CR 2. The site will include a pump house building, aforebay, and equipment pads outside the pump station/forebay. The Booster Pump Stations and water tank locations will be on separately owned parcels and will be located on Recorded Exemption lots. The applicant indicated that there will be staging and laydown areas, at to be determined locations. The application will show the permanent infrastructure; however, the staging and laydown areas will not be provided on the maps submitted in the application, but rather on the final map to be recorded. The applicants indicated that they plan to construct the pipeline and appurtenances early 2021 through end of 2024. They intend to be online by 2025. Building Department Building permits will be required, per Section 29-3-10 of the Weld County Code. Currently the following has been adopted by Weld County: 2018 International Residential Code, 2018 International Building Code, 2018 International Existing Building Code, 2018 International Mechanical Code, 2018 International Plumbing Code, 2018 International Fuel Gas Code, 2006 International Energy Conservation Code, and 2017 National Electrical Code. A building permit application must be completed and two complete sets of engineered and architectural plans bearing the wet stamp of a Colorado registered engineer or architect must be submitted for review for each structure. Pre -Manufactured non-residential structures are required to comply with State of Colorado Regulations. All Commercial Building Permit Applications require a complete code analysis prepared by a Colorado registered design professional and shall be submitted with application package to Weld County. All new Commercial Building Projects require Fire District Notification (letter or email form). Proof shall be submitted with Commercial Permit applications. Final Fire District Approval is also required prior to issuing a Certificate of Occupancy and or closing a building permit. Building permit Submittal Requirements can be found on the web -site link below: https://www.weldgov.com/departments/building/building permit/construction handouts more information/ Health Department Staff was unavailable; however please contact Lauren Light at 970-400-2211 for further direction. Waste handling: Waste materials shall be handled, stored, and disposed in a manner that controls blowing debris, and other potential nuisance conditions. The applicant shall operate in accordance with Chapter 14, Article 1 of the Weld County Code. Please answer the following if applicable; indicate if there will be washing of vehicles or equipment, fuel storage, maintenance of vehicles or equipment, floor drains in shop, air emissions permit. Onsite dust: Fugitive dust should attempt to be confined on the property. Uses on the property should comply with the Colorado Air Quality Commission's air quality regulations. Sewage disposal information: Include in application how sewage disposal will be accommodated. If using a septic system provide a copy of the septic permit. Either utilize the County website www.co.weld.co.us/maps/propertyportall or call (970-304-6415) or stop by Environmental Health front counter and request a copy. Potable water information: Include in application how potable water will be provided. Provide a will serve letter or water bill from the water district or provide a copy of well permit. Portable toilets and Bottled water can be used for employees and customers per policy below: TO DEFINE WHEN PORTABLE TOILETS AND COMMERCIALLY BOTTLED WATER ARE ALLOWED Purpose: To define when portable toilets and commercially bottled water are allowed. Policy: Bottled water from a commercial source is allowed in the following circumstances: 1. Temporary or seasonal uses that are utilized 6 months or less per year (for example recreational facilities, firework stands, farmers markets) 2. Gravel mines 3. 10 or less customers or visitors per day And/or one of the following: 4. 2 or less full time (40 hour week) employees located on site 5. 4 or less part time (20 hour week) employees located on site 6. Employees or contractors that are on site for less than 2 consecutive hours a day Policy: portable toilets are allowed in the following circumstances: 1. Temporary or seasonal uses that are utilized 6 months or less per year (for example recreational facilities, firework stands, farmers markets) 2. Gravel mines 3. 10 or less customers or visitors per day And/or one of the following: 4. 2 or less full time (40 hour week) employees located on site 5. 4 or less part time (20 hour week) employees located on site 6. Employees or contractors that are on site for less than 2 consecutive hours a day Public Works County Roads 4, 8, 10, 16, 22, 28, 32, 36, 40, 52, 52 1/4, 56, 86, 88, and 90 are gravel roads and are designated on the Weld County Functional Classification Map (Code Ordinance 2017-01) as local roads, which require 60 feet of right-of-way. The applicant shall delineate and label on the site map or plat the future and existing rights -of -way (along with the documents creating the existing rights -of -way) and the physical location of the roads. If the rights -of -way cannot be verified they shall be dedicated. Pursuant to the definition of setback in the Weld County Code, Chapter 23, Article I, Section 23-1-90, the required setback is measured from the future right-of-way line. Be aware that physical roadways may not be centered in the right-of-way. These roads are maintained by Weld County. County Roads 6, 18, 20, 34, 38, 50, and 68 1/2 are paved roads and are designated on the Weld County Functional Classification Map (Code Ordinance 2017-01) as collector roads, which require 80 feet of right-of- way. The applicant shall delineate and label on the site map or plat the future and existing rights -of -way (along with the documents creating the existing rights -of -way) and the physical location of the roads. If the rights -of -way cannot be verified they shall be dedicated. Pursuant to the definition of setback in the Weld County Code, Chapter 23, Article I, Section 23-1-90, the required setback is measured from the future right- of-way line. Be aware that physical roadways may not be centered in the right-of-way. These roads are maintained by Weld County. County Road 2 is a paved road and is designated on the Weld County Functional Classification Map (Code Ordinance 2017-01) as an arterial road, which requires 140 feet of right-of-way. The applicant shall delineate and label on the site map or plat the future and existing right-of-way (along with the documents creating the existing right-of-way) and the physical location of the road. If the right-of-way cannot be verified it shall be dedicated. Pursuant to the definition of setback in the Weld County Code, Sec. 23-1- 90, the required setback is measured from the future right-of-way line. Be aware that physical roadways may not be centered in the right-of-way. This road is maintained either by Adams or Weld County. Verify which County is responsible for the maintenance in the vicinity of this project. County Roads 12, 12 1/2, 14, 66, 70, and 72 are section line roads. Section line rights -of -way do not exist in all sections in Weld County and should be verified before a decision to utilize them are made. Weld County commonly refers to these as "Non -Maintained Section Line Right -of -Way." The existence of a physical road does not imply public right-of-way and the road may be located on private property. All rights -of -way should be verified and physical roads located in relationship to the public right-of-way to ensure trespassing does not occur. The applicant shall verify the existing rights -of -way and the documents creating the rights -of -way and this information shall be noted on the site plan or plat. The applicant shall delineate on the site map or plat the existing rights -of -way and physical location of roads to be used. If the rights -of -way cannot be verified they shall be dedicated or an adequate easement between property owners shall be provided. Pursuant to the definition of setback in the Weld County Code, Chapter 23, Article I, Section 23-1-90, the required setback is measured from the future right-of-way line. Be aware that physical roadway many not be centered in the right- of-way. These roads are NOT maintained by Weld County. This portion of County Roads 24 and 26 is under the jurisdiction of the Town of Firestone. The municipality has jurisdiction over access to the road. Please contact the municipality to verify the right-of-way requirements, access permit or for any additional requirements that may be needed to obtain or upgrade the permit. This portion of County Roads 42, 44 and 46 is under the jurisdiction of the Town of Firestone. The municipality has jurisdiction over access to the road. Please contact the municipality to verify the right-of-way requirements, access permit or for any additional requirements that may be needed to obtain or upgrade the permit. This portion of County Road 60 is under the jurisdiction of the City of Greeley. The municipality has jurisdiction over access to the road. Please contact the municipality to verify the right-of-way requirements, access permit or for any additional requirements that may be needed to obtain or upgrade the permit. This portion of County Roads 62, 64, and 76 is under the jurisdiction of the Town of Windsor. The municipality has jurisdiction over access to the road. Please contact the municipality to verify the right-of-way requirements, access permit or for any additional requirements that may be needed to obtain or upgrade the permit. This portion of County Roads 74 and 78 is under the jurisdiction of the Town of Severance. The municipality has jurisdiction over access to the road. Please contact the municipality to verify the right-of-way requirements, access permit or for any additional requirements that may be needed to obtain or upgrade the permit. This portion of County Road 80 is under the jurisdiction of the Town of Timnath. The municipality has jurisdiction over access to the road. Please contact the municipality to verify the right-of-way requirements, access permit or for any additional requirements that may be needed to obtain or upgrade the permit. The Colorado Department of Transportation (CDOT) has jurisdiction over all accesses to state highways. Please contact Tim Bilobran at the Greeley office (970-350-2163) to verify the access permit or for any additional requirements that may be needed. (State Highways 14, 34, 52, 60, 66, and 392) Per Chapter 8, Article 13, Section 8-13-30.B, a Weld County Right -of -Way Use Permit is required for any project that will be occupying, constructing or excavating facilities within, and/or encroaching upon, any County rights -of -way or easement. Right -of -Way Use Permit instructions and application can be found at https://www.weldgov.com/departments/publicworks/permits/. Weld County will not replace overlapping easements located within existing right-of-way or pay to relocate existing utilities within the County right-of-way. ACCESS Table 1 - Minimum Access Spacing Criteria (Feet) Access Element Arterial Collector Local Distance between intersections Signalized Unsignalized 2,640 1,320 N/A 1,320 N/A 330 Distance between accesses and intersections 660 660 330 Distance between access points 660 330 150 Distance between access points in subdivisions 660 330 75 Per Chapter 8, Article XIV, Section 8-14-40, an Access Permit is required for access to Weld County maintained roadways. We strongly encourage you to discuss your access with Public Works to ensure the approved accesses are compatible with your layout. Minimum spacing distances between accesses are shown in Table 1 above. Please refer to Chapter 8 of the Weld County Code for more information regarding access. An access approach that is gated shall be designed so that the longest vehicle (including trailers) using the access can completely clear the traveled way when the gate is closed. In no event, shall the distance from the gate to the edge of the traveled surface be less than 35 feet. (Department of Public Works) TRACKING CONTROL POLICY Tracking control is required to prevent tracking from the site onto public roadways. For access to paved roads, permanent tracking control devices can be double cattle guards with 100 ft. of asphalt or 300 ft of asphalt. For access to gravel roads, permanent tracking control devices must be either double cattle guards with 100 ft. of road base, or road base on all driving surfaces. Temporary Tracking Control shall be used during construction unless permanent tracking control is installed ahead of construction activities. Recycled concrete is not allowed in County right-of-way. Tracking control for unmaintained public right-of-way is required just prior to entering publicly maintained roadways. A variance request for alternatives to the tracking control requirement can be submitted to Public Works for review and consideration. TRAFFIC IMPACT STUDY REQUIREMENTS As part of the development review process, all new commercial projects will be required to submit a TIS that is prepared, stamped, and signed by a professional engineer licensed in the State of Colorado, unless the TIS is waived by Public Works. For this project the applicant shall provide a traffic narrative detailing all anticipated construction traffic. The narrative shall include at a minimum the information as requested below. Public Works will review the narrative and advise the applicant if more information or an engineered traffic study is required. Traffic Narrative: 1. Describe how many roundtrips/day are expected for each vehicle type: Passenger Cars/Pickups, Tandem Trucks, Semi-Truck/Trailer/RV (Roundtrip = 1 trip in and 1 trip out of site) 2. Describe the expected travel routes or haul routes for site traffic. 3. Describe the travel distribution along the routes (e.g. 50% of traffic will come from the north, 20% from the south, 30% from the east, etc.) 4. Describe the time of day that you expect the highest traffic volumes. IMPROVEMENTS AND ROAD MAINTENANCE AGREEMENT Public Works may require an Improvements Agreement for one or all the following reasons: • Off -Site Public Improvements • Road Maintenance Agreement • Construction Maintenance Agreement • Access Improvements Agreement • On -Site Improvements for Subdivisions/PUDs An Improvements Agreement is required for sites with required offsite improvements per Chapter 24, Article IX, Section 24-9-20.B. Collateral is required to ensure the improvements are completed, and maintained. Improvements/Road Maintenance Agreement: An example agreement is available at: https://www.weldgov.com/UserFiles/Servers/Server 6/File/Departments/Public%20Works/DevelopmentRevie w/USR-SPR-Permits%20lmprovements%20Agreement%20Template.pdf. It will detail the approved haul route(s), outline when offsite improvements will be triggered, and include a maintenance agreement for the haul routes. Possible mitigations included in the road maintenance agreement may include but are not limited to: dust control, specified haul routes, damage repairs, and future improvement triggers. IMPACT FEE CREDIT Per Chapter 20, Article I, Section 20-1-90, any person commencing development may apply for credit against impact fees otherwise due, up to but not exceeding the full obligation for impact fees proposed to be paid pursuant to the provisions of this Chapter, for any contributions, construction or dedication of land accepted or received by the county for capital improvements of the same type as are eligible for expenditure of the impact fees. In order to receive the impact fee credit, a Front -End Contribution Agreement must be in place prior to approval of any land use case. DRAINAGE REQUIREMENTS: Drainage report checklist: can be found under storm drainage guidance https://www.weldgov.com/departments/public works/development review Please use this check list to expedite completion of the application. Booster Pump Station 1 is within an Urbanizing Drainage Area: Detention ponds shall be sized to store the stormwater runoff generated by the 1 -hour, 100 -year storm falling on the developed site and release of the detained water at the historic runoff rate of the 1 -hour, 5 -year storm falling on the undeveloped site for urbanizing areas and the historic runoff rate of the 1 -hour. Historic is defined as an undeveloped site with a 2.0% imperviousness. Booster Pump Station 2 is within an Non -Urbanizing Drainage Area: Detention ponds shall be sized to store the stormwater runoff generated by the 1 -hour, 100 -year storm falling on the developed site and release of the detained water at the historic runoff rate of the 1 -hour, 10 -year storm falling on the undeveloped site for urbanizing areas and the historic runoff rate of the 1 -hour. Historic is defined as an undeveloped site with a 2.0% imperviousness. A detention pond design summarized in a drainage report is required for each booster pump site unless the site falls under an exception to stormwater detention requirements per code section (Sec 8-11-40. Drainage Policy -Exceptions). To avoid holding up case processing a minimum of either a preliminary drainage report or a drainage narrative with exception as shown below must be submitted with completeness review case submittal information. Detention Pond Requirements: 1. A Drainage Report and Detention Pond Design shall be completed by a Colorado Licensed Professional Engineer and adhere to the drainage related sections of the Weld County Code. The Drainage Report must include a Certification of Compliance, stamped and signed by the PE, which can be found on the engineering website. A general Drainage Report Guidance Checklist is available on the engineering website. A Preliminary Drainage Report or a qualifying exception and Drainage Narrative shown below must be submitted for review at the time of the application. OR 2. Drainage Narrative requirements with exception from detention pond. The Drainage Narrative must describe at a minimum: A. Any existing and proposed improvements to the property. B. The exception being requested for consideration. C. Where the water originates if it flows onto the property from an off -site source. D. Where the water flows as it leaves the property. E. The direction of flow across the property. F. Previous drainage problems with the property, if any. G. The location of any irrigation facilities adjacent to or near the property. H. Any additional information pertinent to the development. Exceptions to stormwater detention shall not jeopardize the public health, safety, and welfare of public and private property. No stormwater detention will be required for sites that meet any of the following conditions. Requirements of the Municipal Separate Storm Sewer System (MS4) areas remain applicable. Public Works will confirm if the development qualifies for an exception based upon the information provided by the applicant. DRAINAGE CODE EXCEPTIONS (informational only): Exceptions to the stormwater detention shall be limited to the following uses: 1. Use by Right or Accessory Use in the A (Agricultural) Zone District. 2. Zoning Permits for accessory storage, commercial vehicles, home occupations, or manufactured homes in the A (Agricultural) Zone District. 3. A second dwelling permit in the A (Agricultural) Zone District. 4. Towers including, but not limited to, wind and telecommunication towers. 5. Pipelines or transmission lines, excluding laydown yards, metering sites, substations, and any other above ground appurtenances. 6. Gravel pits if the stormwater drains into the gravel pit. Releases from the site shall comply with the Weld County Storm Drainage Criteria, including dewatering. Topographical information shall be provided. 7. Residential developments where all the following conditions exist. This exception shall be supported by calculations signed and stamped by a Colorado Licensed Professional Engineer a) Nine (9) lots or fewer. b) The average lot size is equal to, or greater than, three (3) acres per lot. c) Downstream roadway criteria are not exceeded. d) The total post -development imperviousness for the rural residential development does not exceed ten percent (10%), assuming that all internal roads and driveways are paved, or will eventually be paved. 8. Development of sites where the change of use does not increase the imperviousness of the site. 9. Non -Urbanizing areas where the total pre-existing and post development impervious area produces stormwater runoff of less than, or equal to, 5 cfs for the 1 -hour, 100 -year, storm event. This exception shall be supported by calculations signed and stamped by a Colorado Licensed Professional Engineer. 10. Parcels with total area less than, or equal to, 1.0 gross acre. 11. An individual parcel with an unobstructed flow path and no other parcel(s) between the Federal Emergency Management Administration (FE MA) regulatory floodplain channel and the project. 12. A parcel greater than 1 gross acre and less than, or equal to, 5 gross acres in size is allowed a onetime exception for a new 2,000 sq. ft. building or equivalent imperviousness. 13. A parcel greater than 5 gross acres in size is allowed a onetime exception for a new 4,500 sq. ft. building or equivalent imperviousness. 14. Concentrated Animal Feeding Operation (CAFO), Animal Feeding Operations (AFO) and Housed Commercial Swine Feeding Operation (HCSFO) which are covered and approved by the Colorado Discharge Permit System (CDPS) regulations. Portions of the site not included or covered by the CDPS permit, shall comply with the Weld County Storm Drainage Criteria Historic Flows: The applicants will be required to maintain the historic drainage flows and run-off amounts that exist from the property. GRADING PERMIT: A Construction Stormwater Permit is also required with the State for disturbing more than 1 acre. Contact: Colorado Department of Public Health and Environment, Water Quality Control Division, Permit Support Staff at 303-692-3517. Per Weld County Code, Chapter 8, Article XII, Section 8-12-30.D.3, if more than 1 acre is to be disturbed for construction of non -pipeline items such as pump stations, structures, parking lots, laydown yards, etc., a Weld County Grading Permit will be required prior to the start of construction. Grading Permits are issued after the planning process is complete (map recorded). An Early Release Request Form may be entertained only after the applicant, Public Works, and the Planning Department have reviewed the referral and surrounding property owner comments and the case has been heard by the Board of County Commissioners. The Early Release Request may or may not be granted depending on referral comments and surrounding property owner concerns. Contact an Engineering Development Review representative from the Public Works Department for more information. Application Fees: 1-5 Acres/ $50, 5.1 - 20 Acres/$100, 20.1 Acres or Greater/$200 + $1 per acre over 20. SITE MAP REQUIREMENTS: A Site Plan will be required identifying the following (if applicable): o Show and label location of existing roads, existing road rights -of -way, future road rights -of -way, and easements o Show and label the unmaintained section line rights -of -way o Show and label location of the accesses and label access type (Agricultural, Residential, Commercial/Industrial, and/or Oil & Gas) o Show and label the access turning radii (Commercial — 60') o Show and label the approved tracking control o Show and label location of drainage related features i.e. detention pond(s), ditches, etc... Detention ponds shall be labeled as "No Build/Storage Area" and include design volume o Show and label the drainage flow arrows showing how the stormwater flows across the property o Show and label the parking and traffic circulation flow arrows showing how the traffic moves around the property Public Works Contact List Access Permits Tiffnee Lamb tklamb@weldgov.com 970-400-3718 Improvements Agreements Tisa Juanicorena tuanicorena@weldgov.com 970-400-3778 Right -of -Way Permits Amy Mutchie amutchie@weldgov.com 970-400-3764 MS4 Requirements Lyndsay Holbrook Iholbrook@weldgov.com 970-400-3788 Development Review (Engineering) o Mike McRoberts mmcroberts@weldgov.com 970-400-3798 o Zackery Roberson zroberson@weldgov.com 970-400-3773 o Melissa King mking@weldgov.com 970-400-3762 Planning Department Additional fees may be included with the Building Permit such as Road Impact, County Facilities and Drainage fees. Please refer to the handout provided. Screening of the parking area or outdoor storage may be required from any adjacent landowners or public rights -of -way. Weld County has Coordinated Planning Agreements (CPA) with the Towns of Timnath, Severance, Windsor, Johnstown, Berthoud, Milliken, Mead, Platteville, Firestone, Frederick and the Cities of Fort Lupton and Dacono. The Planning Director will contact the Town Managers to give notice of this pre -application meeting. Staff advised the applicants to contact these municipalities regarding possible land use permitting including possible annexation. Staff urged the applicant to contact staff for any questions: Planner on Call available Monday through Friday 7:30 a.m. to 4:30 p.m. or contact Diana Aungst at 970-400- 3524 or daungst@weldgov.com Staff explained the USR process. The applicant shall submit 1 packet for a completeness review. After the completeness review the applicant will be informed of what items are still required to make the application complete. Staff requested that the applicant submit the remaining material in electronic form. Upon submittal of a completed application it will be sent out for referral for 28 days. The applicant will then meet with their Planner to discuss the referrals and address as many of the referrals as possible. At that meeting the Planning Commission hearing will be scheduled. The Board of County Commissioners hearing typically follows approximately 3 weeks after the Planning Commission hearing. The above notes are provided as a courtesy to the applicant. While we strive to help identify as many potential issues upfront during the pre -application meeting, we cannot anticipate every issue that may come up during the formal application process. The information contained herein has been placed on file with the Department of Planning Services. The pre -application is valid fora period of one (1) year from the date ofpre- application. If a formal application is not received following the time period specified herein the Planning Department reserves the right to require a new pre -application meeting. Please note that all land use, building and impact fees are subject to change throughout this time period. End memorandum. Section 14 Evidence of Adequate Water Supply This section addresses Procedural Guide Checklist, evidence of adequate water supply. Evidence of adequate water supply is not applicable to the TWP. On February 6, 2020, Weld County staff stated that evidence of adequate water supply is not applicable to the TWP. A summary of that discussion is included in section USR Procedural Guide Checklist. TWP USR SUPPLEMENT 2 SECTION 14 EVIDENCE OF ADEQUATE WATER SUPPLY 14-1 Section 15 Evidence of Adequate Sewage Disposal This section addresses Procedural Guide Checklist, evidence of adequate sewage disposal. Evidence of adequate sewage disposal is not applicable to the TWP. On February 6, 2020, Weld County staff stated that evidence of adequate sewage disposal is not applicable to the TWP. A summary of that discussion is included in section USR Procedural Guide Checklist. TWP USR SUPPLEMENT 2 SECTION 15 EVIDENCE OF ADEQUATE SEWAGE DISPOSAL 15-1 Section 16 Drainage This section addresses Procedural Guide Checklist, a drainage report, preliminary drainage study, or drainage narrative, as determined by Public Works, the USR Questionnaire, Public Works Questions 3 and 4, and WCC Chapter 8, Article Xi Storm Drainage Criteria, and the criteria described in WCC Sections 23-2-480 3, 23-2-480 5, 23-2-480 8, 23-2-490 C, 23-2-490 E, and 23-2-490 H. Water Pipeline and Water Tank The water pipeline and the water tank site are excepted from the stormwater detention requirements per WCC Section 8-11-40 I. The exceptions that apply are as follows: • Water pipeline: Exception 5 "Pipelines or transmission lines, excluding laydown yards, metering sites, substations, and any other above ground appurtenances." + Water tank site: Exception 9 "Non -Urbanizing areas where the total pre-existing and post development impervious area produces stormwater runoff of less than, or equal to, five (5) cfs for the 1 -hour, 100 -year, storm event. This exception shall be supported by calculations signed and stamped by a Colorado Licensed Professional Engineer." A drainage narrative for the water pipeline is provided behind this page and a drainage narrative for the water tank is provided in Volume 4 in accordance with WCC Section 8-11-40 i and USR Questionnaire, Public Works Question 3. Pump Stations Preliminary drainage reports for the pump stations are provided behind this page and have been developed in accordance with WCC Chapter 8, Article X! Storm Drainage Criteria and USR Questionnaire, Public Works Question 4. Staging Areas If used by the TWP contractors and in accordance with Weld County staff recommended conditions of approval, drainage narratives for staging areas will be submitted before start of construction. TWP USR SUPPLEMENT 2 SECTION 16 DRAINAGE 16-1 DRAINAGE NARRATIVE Thornton Water Project Water Pipeline Exception to Stormwater Detention Prepared for Weld County on behalf of City of Thornton Weld County Case Number USR18-0130 January 2021 CH2M Hill Engineers, Inc. 9191 South Jamaica Street Englewood, CO 80112 TWP USR SUPPLEMENT 2 SECTION 16 DRAINAGE NARRATIVE WATER PIPELINE WP -1 THORNTON WATER PROJECT DRAINAGE NARRATIVE - WATER PIPELINE EXCEPTION TO STORMWATER DETENTION Existing and Proposed Improvements to the Property This section addresses WCC Section 8-11-401.1. Thornton is proposing to locate and construct the Thornton Water Project (TWP), which is a water delivery system that will convey high quality domestic water Thornton purchased in the mid -1980's from the Water Supply and Storage Company (WSSC) system, located in Larimer County, to Thornton. The TWP includes approximately 60 miles of pipeline through Larimer and Weld Counties to Thornton. The TWP includes approximately 34 miles of a buried 42 -inch diameter water pipeline capable of conveying 40 million gallons per day (mgd) in unincorporated Weld County. Figure la and Figure lb show the water pipeline alignment. Water Pipeline Exception to Stormwater Detention Approximately 34 miles of a buried, 42 -inch diameter water pipeline capable of conveying 40 mgd of water will be constructed in unincorporated Weld County. The water pipeline includes buried appurtenances which include buried fiber optic cable, various buried water pipeline structures and valve vaults. The buried water pipeline structures and valve vaults include access manways, blow -off assemblies, air release vaults, and isolation valve vaults. The water pipeline will be buried at a minimum depth of 4 feet below grade. The depth of bury will vary based on existing utility crossings, road crossings, water crossings, other existing or proposed features, and property owner's reasonable preferences. Typically, a 50 -foot permanent easement for the water pipeline and an additional 40 -foot temporary easement for construction will be acquired from property owners. Areas disturbed for constructing the water pipeline will be restored to pre -construction conditions, including grade and vegetation. The Applicable Exception This section addresses WCC Section 8-11-40 1.2 and USR Questionnaire, Public Works Questions 3.a. The water pipeline is excepted from the stormwater detention requirements per WCC Section 8-11- 40 I. The exception that applies is as follows: • Water pipeline: Exception 5 "Pipelines or transmission lines, excluding laydown yards, metering sites, substations, and any other above ground appurtenances." TWP USR SUPPLEMENT 2 SECTION 16 DRAINAGE NARRATIVE WATER PIPELINE WP -2 Drainage Narrative TWP Water Pipeline U CR 10 Thornton WATER DP . .t_. CITY OF THORNTON COLORADO 12450 WASHINGTON ST es cr J • • • _M= • • aaar_ • • U 0 S 0.875 CR '6 U cc U' CR 46 Groat Maims Railroad JOHNSTOWN 1 75 Miles BERTHOUD :q4. TVVP in Unincorporated Weld County TWP outside Unincorporated Weld County —• County Boundary a j Railroad River/Stream/Canal/Ditch Lake/Reservoir I 14 ACS' 3 ) CR 46 Figure 1a TWP Water Pipeline THORNTON, CO 80241-2405 1/28/2021 1 inch = 1.75 miles W1478088_ THORNTON_NDORT tiERN PROJECT\TASK_OROER_5%5 _PERM1"'%GrCa ISlMADF1LESIWELO_JSRIRESOURCE_MAPSIPERMIT APP_2tr.ctiiArNAZ`E_NARRAT ivnTWP WATER PIPELINE MC JOUAN ¶/2W20i1I 1041 PM Sources USGS '010 CDWR Wria County COOT Drainage Narrative TWP Water Pipeline WASATCH RD VERMILLION RD :p ‘9TH AVE - • ARAPAHOE RD I 2 x`J ut co t -••T, ens r„pM m 0 nsue' ? Q 4 et CO J, � a�P evtatt- 3 c# 1601H AVE CR 40$ CR38 • _51 \ _ 1= �I -BERTHOUD N CR36O rt r ADAMS AV. CR 20.5 LONGMONT a CR 16 5 U U ERIE MEAD 1N' m W W 1475 R 1450 CR IC 575 440- Ir` ..J l- i A�/14E.O4 ..„--7..„iS_ , '{ i n_ .. S .0 414 i� 0 7 Lco 0 CC U CR 42 ZINNIA AV :k 44 ) MILL/KEN CR305 CR 48 ELM ST MAPLE PINE CONE AV FIRESTONE : ---'FREDERICK DACONO ': BROeMFIELD NORTHGLENN THORNTON GILCREST CR12 ca CR 18.s 7.TH ST s �- 1 it FA4 - T CI DENVER ST' , EVANS BASELINE RD' • .s• Thornton CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/28/2021 0 S 0.875 1.75 1 inch = 1.75 miles Miles TWP in Unincorporated Weld County TWP outside Unincorporated Weld County —` County Boundary T Railroad River/Stream/Canal/Ditch Lake/Reservoir Figure lb TWP Water Pipeline Se ces SGS NHD CDWR NRiO Court CDO W ‘478p88_rHORNTON_NORTHERN_PROJECTITA9C_ORDER _51,5 1_PERMITTINGIGI$IMAPFILESIWELD_USRLRESOURCE_MAPSPERMITAPP_ 11DRA:NAGS_VARRAT'VEITWP-WATER_P PEL'NE MC JOUAN 1O8/2O21 1 10 41 PM THORNTON WATER PROJECT DRAINAGE NARRATIVE - WATER PIPELINE EXCEPTION TO STORMWATER DETENTION Where the Water Originates If It Flows onto the Property from an Off - Site Source This section addresses WCC Section 8-11-401.3 and USR Questionnaire, Public Works Questions 3.b. Surface stormwater runoff originates from land abutting the water pipeline alignment and the majority of that land is agricultural use. Where the Water Flows to as it Leaves the Property This section addresses WCC Section 8-11-401.4 and USR Questionnaire, Public Works Questions 3.c. Stormwater flows to existing irrigation ditches, roadside ditches, and drainages as it flows across the water pipeline easement. Areas disturbed for water pipeline construction will be restored following construction to pre - construction grades and vegetation conditions with few exceptions. An example of an exception would be minor grading necessary following construction to restore a stable slope. In general, following construction, historic flow patterns will be maintained and the land will drain in the same manner and at generally the same rate as it did before construction. The Direction of Flow Across the Property This section addresses WCC Section 8-11-401.5 and USR Questionnaire, Public Works Questions 3.d. The TWP within unincorporated Weld County spans seven 10 -digit hydrologic unit code (HUC) watersheds, as shown in Figure 2a and Figure 2b. Generalized flow directions for stormwater are described based on a review of coarse topography (10 -foot elevation contour intervals). While the descriptions provided are generally accurate, it is possible that localized flow directions may vary slightly from those described herein, due to minor local variations in finer topography (e.g. undulations) along the TWP. At its northern most point within unincorporated Weld County, as shown in Figure 2a and Figure 2b, the water pipeline is located along County Road 13, south of County Road 92, near a localized ridge, and within the HUC 1019000710 City of Greeley - Cache La Poudre River Basin. Land generally drains from west to east. Extending south, the water pipeline alignment passes through approximately 0.6 miles of the HUC 1019000709 Boxelder Creek Basin, where land generally drains from east to west across the alignment. Approximately 0.2 miles north of County Road 90 along County Road 13, the water pipeline re- enters the HUC 1019000710 City of Greeley - Cache La Poudre River Basin, to a location approximately 0.7 miles north of US Highway 34. North of the Cache La Poudre River, land generally drains from north to south to the Cache La Poudre River. South of the Cache La Poudre River land generally drains northwest to southeast. From approximately 0.7 miles north of US Highway 34 to 0.2 mile north of State Highway 60, the water pipeline alignment is within the HUC 1019000606 Outlet Big Thompson River Basin watershed. The Big Thompson flows from northwest to southeast. Land north of the Big Thompson TWP USR SUPPLEMENT 2 SECTION 16 DRAINAGE NARRATIVE WATER PIPELINE WP -5 Drainage Narrative TWP Water Pipeline DER 5%5 '_PERM; ThQC,SIMAIL ' L Drainage Narrative TWP Water Pipeline e..rl/ . Lake CR 40.5 NASATCH RD • TN A 4%003 NA LONGMONT • SKYWAY OR CR205 CR 18.5 ERIE t?'">r :1019000506 A. Coal Creek -Boulder BERTHOUD TIPPLE Pv DACONO • •0R6 t_ N. s9�'. 3 eJ Creek Basin Fri-v:vLAFAYET.TE_..__. '��' I o <. .,: m N FLAGv ^,-J PREt�E • J e`' 0 ��. 160TH AVE 2 0 z NNIAAV FIRESTONE 8TI G,• PINE CONE AV z FIRESTONE PLATTEVILLE R305- 4) SCR' 1019000306 " -z.4 Little Dry Creek -South Platte River Basin /' 4\S!ltf444 101 9000304 Big Dry Creek -South, Platte River Basin '. BRIGHTON GILCRESV 4TH ST CR 40 CR 36 e V. CR 18.5 fTH ST CR 2.5 4. H DENVER ST e i < Zr CR42 - LOCHBUIE CR 21 FORT LUPTON W 4 (+Thornton • i 1. � 1. � J L1 - . CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/28/2021 0 S 0.875 1.75 1 inch = 1.75 miles Miles TWP in Unincorporated Railroad Weld County Stream/River/Canal/Ditch TWP outside Unincorporated Lake/Reservoir """ Weld County HUC 10 Boundary Drainage Flow Direction 100ft Contour 20ft Contour —••• County Boundary Figure 2b HUC Watersheds Tars USGS_ NHD CPWR WWW Cowl* COOT W 478086 THORNTON_NORTHERN_PROJECT\TASK_ORDER_5L51_PERMITTINGIGISUAAPFILES%WELD_USR%RESOURCE_MAPSWERMITAPP 202ItORA!NAGE_NARRATivEWUC_WATERSHEDS MXD JOUAN V2612021 1 13 07 PM THORNTON WATER PROJECT DRAINAGE NARRATIVE - WATER PIPELINE EXCEPTION TO STORMWATER DETENTION River generally drains north to south. Land south of the Big Thompson River generally drains southwest to northeast. The water pipeline is located within the HUC 1019000605 Dry Creek - Little Thompson River Basin from approximately 0.2 miles north of State Highway 60 to approximately County Road 40. Along this portion of the water pipeline, land generally drains northwest to southeast north of the Little Thompson River and then drains southwest to northeast south of the river. The water pipeline continues south, entering the HUC 1019000507 Boulder Creek -Saint Vrain Creek Basin from approximately County Road 40 to approximately 0.5 miles north of State Highway 52. From County Road 40 to Saint Vrain Creek land generally drains in a south/southeasterly direction toward Saint Vrain Creek. South of Saint Vrain Creek, land generally drains southeast to northwest. From approximately 0.5 miles north of State Highway 52 to approximately 0.3 miles south of County Road 10, the water pipeline is located in the HUC 1019000306 Little Dry Creek -South Platte River Basin. North of Little Dry Creek land generally drains from northwest to southeast. South of Little Dry Creek land generally drains from south to north as it crosses the water pipeline. Little Dry Creek flows from southwest to northeast. The water pipeline is in the HUC 1019000304 Big Dry Creek- South Platte River Basin from approximately 0.3 mile south of County Road 10 to County Road 2. Land generally drains from the northwest to the southeast, toward Big Dry Creek. South of Big Dry Creek, land drains from south to north. Big Dry Creek generally flows from southwest to northeast. Previous Drainage Problems with the Property, if Any This section addresses WCC Section 8-11-401.6 and USR Questionnaire, Public Works Questions 3.f. Flooding has historically occurred along several of the drainageways the water pipeline crosses. Other than occasional severe flooding events in history, no previous drainage problems are known. The Location of Any Irrigation Facilities Adjacent to or Near the Property This section addresses WCC Section 8-11-401.7 and USR Questionnaire, Public Works Questions 3.e. Multiple irrigation ditches within unincorporated Weld County were identified crossing the water pipeline as shown on Figure la and Figure lb and as listed below. • Cowan Lateral/Cactus Hill Lateral + Larimer County Canal • Larimer and Weld Canal + Greeley Number 2 Canal + Farmers Ditch • Hill and Brush Ditch + Hillsborough Ditch + Farmers Extension Canal • Last Chance Ditch + Inlet Ditch • Coal Ridge Ditch TWP USR SUPPLEMENT 2 SECTION 16 DRAINAGE NARRATIVE WATER PIPELINE WP -8 THORNTON WATER PROJECT DRAINAGE NARRATIVE - WATER PIPELINE EXCEPTION TO STORMWATER DETENTION • Standley Ditch • Bull Canal • Thompson Ditch/Big Dry Creek Ditch • Yoxall Ditch TWP USR SUPPLEMENT 2 SECTION 16 DRAINAGE NARRATIVE WATER PIPELINE WP -9 PRELIMINARY DRAINAGE REPORT Thornton Water Project Pump Station 1 Site Prepared for Weld County on behalf of City of Thornton Weld County Case Number USR18-0130 May 2020 CH2M Hill Engineers, Inc. 9191 South Jamaica Street Englewood, CO 80112 TWP USRSUPPLEMENT SECTION 16 PRELIMINARY DRAINAGE REPORT PUMP STATION 1 PS1-1 THORNTON WATER PROJECT PRELIMINARY DRAINAGE REPORT- PUMP STATION 1SITE Description of Project Thornton is proposing to locate and construct the TWP, which is a water delivery system that will convey high quality domestic water Thornton purchased in the mid -1980's from the Water Supply and Storage Company (WSSC) system, located in Larimer County, to Thornton. This preliminary drainage report has been prepared in accordance with the requirements of Weld County Code 8-11-40, Section D, and satisfies the requirements of Public Works Question 4 of the USR Questionnaire. This report is for the Pump Station 1 site, which is located east of the intersection of County Road 13 and County Road 50 (northwest quarter of Section 6 of Township 4 North, Range 67 West). Approximately 250 feet west of the site is an unnamed tributary within the Big Thompson River drainage basin that flows from southwest to northeast. There are no regulatory floodplains (see Attachment A: FEMA Floodplain Map) within or adjacent to the site (FEMA Zone X). There are no irrigation facilities on or adjacent to the site. The existing condition of the site is undeveloped and the soils on the site are hydrologic group A (See Attachment B: NRCS Soils Map and Description). The property that includes Pump Station 1 is 3.75 acres, and the pump station project area is 3.42 acres of the property. Within the project area, 1.1 acres will be developed with pavement, gravel, and rooftops. The project is located in a non -urbanizing area in accordance with Weld County Code 8-1 1-20 because it is greater than one -quarter of a mile from the municipal boundary of the Town of Johnstown (See Attachment C: Pump Station 1 Proximity to Municipal Boundaries). Hydrology and Hydraulic Analysis The existing drainage patterns on the site are generally from south to north toward the tributary to the west of the site (See Attachment D: Existing Site Drainage). The site is in a local Low area and receives offsite drainage from the west, south, and east. An existing unpaved road is located to the west of the site but otherwise these areas are undeveloped. In the proposed condition the drainage pattern will remain the same with a detention basin proposed at the north end of the site to provide water quality capture volume and detention prior to discharging from the site (See Attachment E: Preliminary Drainage Plan). The existing and proposed conditions were analyzed using UD Rational version 1.02a (2005) and UD Detention version 2.35 (2015). Rainfall depths were taken from NOAA Atlas 14 (See Attachment F: NOAA 14 Precipitation Data). The existing drainage basin is 16.3 acres and is 2.9% impervious. The construction of the pump station, roads and facilities will increase the imperviousness of the drainage area to 8.9%. A detention pond is provided for the developed portions of the site (1.3 acres and 62.5% impervious). Offsite and undeveloped portions of the drainage basin, and a portion of development near the site entrance, will flow undetained in existing flow patterns. Please see Attachment G: UDFCD Recommended Percentage Imperviousness Values and Runoff Coefficients and Attachment H: Imperviousness and Rational Calculations. In order to comply with Weld County Code 8-11-40, Section D, the detention pond provided for this non -urbanizing area provides detention of runoff from the 1 -hour, 100 -year storm and TWP USR SUPPLEMENT SECTION 16 PRELIMINARY DRAINAGE REPORT PUMP STATION 1 PS1-2 THORNTON WATER PROJECT PRELIMINARY DRAINAGE REPORT- PUMP STATION 1SITE releases the detained water at the historic runoff rate of the 1 -hour, 10 -year storm (see Attachment I UDFCD Detention Calculations). Conclusion This preliminary drainage report for Pump Station 1 documents the feasibility of the preliminary drainage plan and ensures that the detention volumes can meet the requirements of the Weld County Code. Final design of the drainage infrastructure will be included in a final drainage report and will include final grading and site Layout, additional design of the pond outlet structure and configuration, and sizing for storm drain pipes and swales throughout the site. A maintenance plan for the storm drainage and detention system will also be included with the final drainage report. It is anticipated that onsite inspection, cleaning of sediment and debris, and vegetation maintenance should occur at Least annually with repairs performed as the need for them is identified. Attachments Attachment A: FEMA Floodplain Map Attachment B: NRCS Soils Map and Description Attachment C: Pump Station 1 Proximity to Municipal Boundaries Attachment D: Existing Site Drainage Attachment E: Preliminary Drainage Plan Attachment F: NOAA 14 Precipitation Data Attachment G: UDFCD Recommended Percentage Imperviousness Values and Runoff Coefficients Attachment H: Imperviousness and Rational Calculations Attachment I: UDFCD Detention Calculations TWP USRSUPPLEMENT SECTION 16 PRELIMINARY DRAINAGE REPORT PUMP STATION 1 PS1-3 National Flood Hazard Layer FIRMette 40'21'7.76"N 40°2C'40.34"N 0 250 500 1.000 1,500 Feet 1:6.000 2,000 .n, FEMA Attachment A Legend SEE EIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT SPECIAL FLOOD HAZARD AREAS OTHER AREAS OF FLOOD HAZARD OTHER AREAS GENERAL f O SCREEN Without Base Flood Elevation (BFE) Zone 4, V 499 With BFE or Depth Zone ME, 40. AH. YE, 4R Regulatory Floodway 0 2% Annual Chance Flood Hazard, Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mile Future Conditions 1% Annual Chance Flood Hazard mne A Area with Reduced Flood Risk due to Levee. See Notes. Area with Flood Risk due to Levee Area of Minimal Flood Hazard Effective LOMRs Area of Undetermined Flood Hazard — — Channel, Culvert, or Storm Sewer STRUCTURES i i i i i i i Levee, Dike. or Floodwall OTHER FEATURES MAP PANELS O Cross Sections with 1% Annual Chance Water Surface Elevation Coastal Transect Base Flood Elevation Line (BFE) Limit of Study Jurisdiction Boundary Coastal Transect Baseline Profile Baseline Hydrographic Feature Digital Data Available No Digital Data Available Unmapped The pin displayed on the map is an approximate point selected by the user and does not represent an authoritative property location. This map complies with FEMA's standards for the use of digital flood maps if it is not void as described below. The basemap shown complies with FEMA's basemap accuracy standards The flood hazard information is derived directly from the authoritative NFHL web services provided by FEMA. This map was exported on 2/25'2020 at 5:04:35 PM and does not reflect changes or amendments subsequent to this date and time. The NFHL and effective information may change or become superseded by new data over time. This map image is void if the one or more of the following map elements do not appear basemap imagery, flood zone labels, legend, scale bar, map creation date, community identifiers, FIRM panel number, and FIRM effective date. Map images for unmapped and unmodernized areas cannot be used for regulatory purposes_ Attachment B 9 40° 20' 44" N En ° 0 505300 s O O Hydrologic Soil Group —Weld County. Colorado. Southern Part (PS1 Site) 505450 505350 Map Scale: 1:1,990 if printed on A portrait (8.5" x 11") sheet N 0 25 50 100 Feet 0 50 100 200 300 Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 505500 Meters 150 505550 a 0 40° 20' 44" N Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey 4/21/2020 Page 1 of 4 Attachment B Hydrologic Soil Group —Weld County. Colorado, Southern Part (PS1 Ste) MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Rating Polygons II A 0 ND 0 B 0 B/D 0 C a C/D a D Not rated or not available Soil Rating Lines .y A ND B B/D .w C/D .0 . , Not rated or not available Soil Rating Points • • • • A ND B BID O • • O C C/D D Not rated or not available Water Features Streams and Canals Transportation 4- Rails WINO Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that compnse your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL, Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: Weld County, Colorado, Southern Part Survey Area Data: Version 18, Sep 13, 2019 Soil map units are labeled (as space allows) for map scales 1 50,000 or larger. Date(s) aerial images were photographed: Sep 20; 2015 —Aug 12, 2018 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Natural Resources Conservation Service Web So I Survey National Cooperative Soil Survey 4/21/2020 Page 2 of 4 Attachment B Hydrologic Soil Group —Weld County, Colorado, Southern Part PS1 Site Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 4 Aquolls and Aquepts, flooded D 0.1 0.7% 13 Cascajo gravelly sandy loam, 5 to 20 percent slopes A 0.7 4.5% 15 Colby loam, 1 to 3 percent slopes B 2.1 13.1% 17 Colby loam, 5 to 9 percent slopes B 2.8 17.9% 53 Otero sandy loam, 5 to 9 percent slopes A 10.1 63.8% Totals for Area of Interest 15.8 100.0% = Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey 4/21/2020 Page 3 of 4 Attachment B Hydrologic Soil Group —Weld County, Colorado, Southern Part PS1 Site Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long -duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink -swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff- None Specified Tie -break Rule: Higher = Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey 4/21/2020 Page 4 of 4 A 8 O 2 1 1 4 GS GS JOHNSTOWN MUNICIPAL LIMITS, TYP z 1 ti u 3 z ti J w 1W' WATERLINE AND EASEMENTS TVP PUMP STATION • EXST EASEMENT. TVP I I L Ssj a I I I I I I I I I I I •A Mt( (11.474P S. A f1ON P. QN. eitTAN IIIINC 1111E r F. R -VP I I I I a 400 800 1200 S IMO Scale y, reef C 7 to 6 Y 2 22 a 0 9 2 2 O THORNTON CO 1 HORN TON WA16R CRUJtCt rn I— J 2 Oz() F— w z Lc Co2-e cL O2 hi - O 0 vERFY SCKC H[O O�i>w OM OARS MS.. flATF APRIL 2020 PRO7 7Ts906 CMG uSRG.015] SHEET oI SPWLIRL Y"NPA• •• TN ENAME SPL27010gee IROT CATE' 20206.1119 IRON OW- , SA.31 PM s Aa I 0 34 a3 ■2 r- 3 1 Si Cr +�7 et a, ti Is et I,, a# o le rJ t7 ad Nj Si eta Jp� SP.1PAT� 11., THATIE MICA qrR -1.• sat. vas" QLSIOLI t -t _ n1 SUB -8451N NUMBER AREA IMRES' w RGAT DIRECT10h — ATSTP C FLDV, PATH -- - - -- SOS -84.51N ® of si n Pla4' EXST CONTOURS EXST GAS GS 110 100 ST0 Scar Inc owl c. a h J J7 i U 2 I S i W C 0 Z 3 T 2 f ni�NN ION NA 11; Ir PHWEI 1 JERrr sc.ux SAP It p -a urw�..a HAmow•.. GATE APR& 2020 PR 01 475938 DWG •l$R -0754 SHEET of PLOT Dare t'UO1041t9 PLOT !WE ...Ulf; PM QI r4 •\. A'Ir L. N1'1'• Is :1 4 tr iI 'lh.A W NC'i** k r r t I I . ,..' ;- �� • 1 ;y\ t CC p r / 11 / T; ✓'!' • `� `,. .- • `' a \ a Z to 1 r r P '' J • / - i +I�� l\ �1,\i •i1•:"L:"C1 ••, 1•, \ 1�• i \. •�� y • � t t c.) „.-•�Y' - I. - COUNTY ROAD 50 -------w 1 _ -+ — S • _ .� _. .�-�. - 1 si la ' M l i.•f','�w. "s.' J• 1; \ 1IIIJI'.�`F 11 I w. 1. 1�1 ��.... • ` -' '-` it j - r mow• t I 1. ( .�/ ) p .7' • - — , ..• 1 Y • fit'' �C %� '� d • \ , O a - ��p� t "Ji:wcs yi ti : .. �.-, ,� 'r-• - •\ -. nruGNsown :a _ 0]011! �3 I sieti *Nast , iI j�'-� ) 1' •r ..� 1 / 7JLt 1 - •i- .. , " / 7L2 )O iLI s .� �,� l • ; - • tIRJAN TON INA tE A PAUJEC PUMP STATION 1 TNCMWTONWATEI4PtroitCr ATTACHMENT E cult OF TMGpNTpN PRELIMINARY DRAINAGE PLAN TMONNSI7N CO •ti L.t ., 'ttsis tit- wt,11Fq.* flat 'Ii VA.%AW 1 :144 Ws. £P. L VL•' Iu tit to W IN ,.rte . r , , ./ �. Q, ff OS :41 .^ • �• ( ^. -- _.. .. '• d f v4E1 IMINAAV W :Yn OE SIGN �� ..3.0" it 1� ! 1/ ' �� J i> r ` I ---•• ill 1 / t ^•' twF . .� .� �... -. , f �.•• _/-. + TI BUTARY BASINS 6-7 IWO 6t AREA 1.) A(-RE5 -• ��...•-• `Y ` l ...*::._.,1/J • -\— - - `,.../• �•{ f ((11" ! . � / % II P �{ I ' T>r' _ • Fes.. t `. 1 \ - • ' A ` \ . It \\ 1\ .'.� /'_. 1 U$OM€RTV T e i.r '• ` •/ / �- . .. •..,• f- TRIBUTARY ARE A WPERYICUSNESS 3i.S•- tOdrR PEAK DISCHARGE_ 0.33 GCS' IJIYEAP IISYORIL DISLItARGE FROM I ] KBEs J•. ��ER1•1015 l-SUb-BA.SM NUMBER 1 __ - - % • -. rHt / /�( " r / / L 0)141 NUASINI'. 1 vN / , i -. 1 t r �, 1• • , , t\ i� ��(� '.1 •� ,• ..t. �_, • .f'.•AREAIACRES! • r ./ l/ /)/ \ 1 1` `� 1! ~� T. �f �, ,. 1\ c111f t, , \1` •• _'• \.` 1,` ti rtott DIRECTION - - EAST1ttc'Low PATH — SiSB•a+�S►4 90VN0^Hr n D€S$ 1 t. EXST CONTOURS G5 EAST GAS • .r •Ua a ;r _ //// / / / / -1 • i ` , \ b t S. . ` J •. - ' . �. \ l 1 / / { �'6 1. •.. '• i'' `., I. ' :, 1 - _ ".'.\ - _ \'� •, • a ilo DATE 1P�.1L 1010 \ - • 4`,. ' n Ina PRO,' TS96a \ ,• -. _- - r - I - • • • • • 4 - I • • - .. 1 `\ •• III• Subs In 1 •el DWG USR.C-0I SS SHEET oI SPMaL SP 15P.,- FtE•.AQ..E SP-C-I10).bq+. R Ot CATE: /9101Wit9 °LOT TIME •:30-r3 PY 2/17/2020 Precipitation Frequency Data Server Attachment F NOAA Atlas 14, Volume 8, Version 2 Location name: Johnstown, Colorado, USA* Latitude: 40.3481°, Longitude: -104.9366° Elevation: 4901.86 ft** source: ESRI Maps ** source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES Sanja Perica. Deborah Martin, Sandra Pavlovic, lshani Roy, Michael St. Laurent, Carl Trypaluk, Dale Unruh, Michael Yekta, Geoffery Bonnin NOAA, National Weather Service. Silver Spring, Maryland PF tabular I PF graphical l Maps & aerials PF tabular [ PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1 Average recurrence interval (years) Duration L 1 2 IL 5 I[ 10 I) 25 50 f 100 200 500 1000 JI 5 -min 0.240 11 (0.187-0.310) 0.287 I (0.223-0.371) I 0.383 (0.297-0.496) 0.481 (0.370-0.626) 0.641 (0.490-0.901) 0.785 (0.580-1.11) 1 0.947 (0.675-1.37) 1.13 (0.772-1.68) 1.40 (0.919-2.14) I 1.63 (1.03-2.49) 10 -min 0.352 (0.274-0.453) 0.421 (0.327-0.543) 0.562 (0.435-0.727) 0.704 (0.542-0.916) 0.939 (0.717-1.32) 1.15 I (0.850-1.63) 1.39 (0.989-2.01) 1.66 (1.13-2.47) 2.05 (1.35-3.14) 2.38 (1.51-3.65) 15 -min 0.429 0.513 1.15 (0.875-1.61) (1.04-1.98) 1.40 (1.21-2.45) 1.69 I 2.02 (1.38-3.01) 2.50 (1.64-3.83) 2.90 (1.84-4.45) 30 -rain 0.571 0.683 0.909 1.14 1.52 1.86 2.25 2.68 3.32 3.86 1O.445-O.131111O.b31-O.881) (0.104-1.184 J0.818-1.48). (1.16-2.14) (1.60-3.26) (1.83-3.99 (2.18-5.09) (2.44-5.91L .11.35-2.63) 60 -min 0.708 (0.551-0.912) 1 0.836 (0.650-1.08) , 1.11 (0.858-1.43) 1.39 (1.07-1.81) 1.87 I (1.43-2.64) 2.30 , (1.70-3.26) 2.79 (1.99-4.06) 3.35 (2.29-5.01) 4.19 I (2.75-6.42) I 4.89 (3.09-7.49) 0.844 0.989 1.31 1.6A 2.21 234 3_34 4.02 5.05 5.92 Z�ir (0.662-1.08) (0.776-1.26) (1.02-1.67) (1.27-2.11) (1.72-3.10) (2.05-3.85) (2.41-4.80) (2.78-5.94) (3.35-7.65) (3.78-8.94) 3 -hr 0.927 (0.732-1.18) I I 1.08 (0.850-1.37) 1.42 (1.11-1.80) 1.78 (1.39-2.27) I 2.40 (1.88-3.35) 2.98 (2.24-4.16) 3.64 (2.64-5.20) 4.40 (3.06-6.45) 5.54 (3.70-8.33) I 6.50 (4.18-9.74) 6 -hr 1.10 (0.872-1.37) 1.27 (1.01-1.60) 1.65 2.06 (2.16-3.78) 2.75 3.38 (2.57-4.66) 4.11 (3.01-5.80) 4.94 (3.47-7.15) 6.18 (4.17-9.17) 7.23 (4.70-10.7) 12 -hr 1.29 (1.03-1.60) 1.53 (1.23-1.90) 1.99 (1.60-2.48) 2.45 (1.95-3.07) 3.18 (2.50-4.25) 3.82 (2.91-5.15) 4.54 (3.34-6.26) 5.33 (3.77-7.56) 6.49 (4.41-9.45) 7.46 (4.90-10.9) 24 -hr 1.55 (1.25-1.90) I 1.82 (1.48-2.24) (1.89-2.88) 2.34 I 2.83 (2.27-3.50) 3.59 4.25 (3.26-5.63) 4.97 (3.69-6.74) 5.77 (4.11-8.03) 6.91 (4.74-9.89) 7.85 (5.21-11.3) 2 -day 1.79 (1.46-2.17) 2.12 (1.73-2.57) 2.71 (2.21-3.30) 3.24 (2.63-3.96) 4.04 (3.20-5.19) 4.71 (3.64-6.12) 5.43 (4.06-7.23) 6.21 (4.46-8.50) 7.31 (5.05-10.3) 8.20 (5.50-11.6) 3 -day 1.95 (1.61-2.35) 2.29 (1.88-2.76) 2.88 (2.36-3.48) 3.42 (2.79-4.16) 4.23 (3.37-5.39) 4.91 (3.81-6.33) 5.64 (4.24-7.45) 6.43 (4.64-8.72) 7.54 (5.24-10.5) 8.44 (5.70-11.9) 4-da y 2.42 (1.99-2.90) 1 3.02 (2.49-3.64) 3.57 (2.92-4.32) 4.39 (3.51-5.57) 5.08 (3.96-6.51) 5.81 (4.39-7.63) 6.60 (4.79-8.91) 7.72 (5.40-10.7) 8.63 (5.85-12.1) 7 -day 2.36 (1.96-2.80) 2.76 (2.29-3.28) 3.44 (2.85-4.11) 4.04 (3.33-4.84) 4.91 (3.94-6.12) 5.62 (4.40-7.09) 6.35 (4.82-8.22) 7.13 (5.20-9.48) 8.21 (5.77-11.2) 9.06 (6.20-12.5) 10 -day 2.60 (2.17-3.07) 3.05 (2.55-3.61) 3.80 (3.16-4.51) i 4.44 (3.68-5.29) 5.35 (4.30-6.60) 6.07 (4.77-7.58) 6.80 (5.18-8.72) 7.57 (5.54-9.96) 8.61 (6.08-11.7) I 9.41 (6.48-12.9) 20 -day 3.33 (2.81-3.88) I 3.85 (3.25-4.50) 4.71 (3.96-5.52) 5.43 (4.54-6.39) 6.41 (5.19-7.77) 7.17 (5.68-8.81) 7.93 (6.09-9.98) 8.70 (6.43-11.2) 9.71 (6.92-12.9) 10.5 (7.30-14.2) 30 -day 3.91 (3.31-4.53) 1 4.49 (3.81-5.22) 5.45 (4.61-6.34) 6.23 (5.24-7.28) 7.29 (5.93-8.75) 8.10 (6.46-9.87) 8.90 (6.87-11.1) J 9.70 (7.21-12.4) 10.7 (7.70-14.2) 11.5 (8.08-15.5) 45 -day 4.59 (3.92-5.29) 5.29 (4.51-6.09) 6.39 (5.44-7.39) 7.29 (6.17-8.46) 8.49 (6.93-10.1) 9.39 (7.52-11.3) 10.3 (7.96-12.7) 11.1 (8.31-14.1) 12.2 (8.81-15.9) 13.0 (9.19-17.3) 60 -day 5.15 (4.41-5.90) 5.95 (5.09-6.82) 7.22 (6.16-8.30) 8.24 (6.99-9.51) 9.58 (7.85-11.3) 10.6 (8.49-12.7) 11.5 (8.97-14.1) 12.4 (9.33-15.7 13.6 (9.85-17.6) (10.2-19.1) 14.4 1 Precipitation Numbers estimates upper Please in (for bounds refer frequency (PF) estimates parenthesis are PF estimates a given duration and are not checked against to NOM Atlas 14 document in at average probable for this lower recurrence more table are based on frequency analysis and upper bounds of the 90% confidence interval) will be greater than maximum precipitation (PMP) estimates information. of partial the upper and interval. may duration series (PDS). The probability bound (or less than be higher than currently that the lower precipitation frequency bound) is 5%. Estimates at valid PMP values. Back to Top PF graphical https://hdsc.nws.noaa.gov/hdsclpfds/pfds_printpage.html?lat=40.3481 &Ion=-104.9366&data=depth&units=english&series=pds 1/4 2/17/2020 Precipitation Frequency Data Server Attachment F PDS-based depth -duration -frequency (DDF) curves Latitude: 40_3481°, Longitude: -104.9366° c .c E E O t1� Duration 5 10 NOAA Atlas 14, Volume 8, Version 2 I N ›ftta >s a a>iN r0 r0 r0 r0 r0 r0 r0 r0 r0 T3 1Q -O Z] Z7 1O Z7 -C N r�14 ~ N r 'Cr w 25 50 100 200 Average recurrence interval (years) 500 1000 Created (GMT): Mon Feb 17 23:47.42 2020 Back to Top Maps & aerials Small scale terrain Average recurrence interval (years) 1 2 5 10 25 50 100 200 5O0 1OO0 Duran --- 5 -min 10 -mm 15 -mm 30-m m 60 -man 2 -hr 3 -hr 5 -hr 12 -hr 24 -hr 2 -day 3 -day may 1 -day 10 -day 20 -day 30 -day 45 -day 60 -day https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=40.3481 &Ion=-104.9366&data=depth&units=english&series=pds 2/4 2/17/2020 Precipitation Frequency Data Server Attachment F Johnstown' 3 k iTr,,2 Mi r Large scale terrain vs • Cheyenne For tCollins • • I • Greeley Peak . • Lin y mon t Boulder 100km I I 60rni •Denver Large scale map Large scale aerial v�v Ar https://hdsc. nws.noaa.gov/hdsc/pfds/pfds_printpage.html?Iat=40.3481 &Ion=-104.9366&data=depth&units=english&series=pds 3/4 2/17/2020 Precipitation Frequency Data Server Attachment F Back to Top US Department of Commerce National Oceanic and Atmospheric Administration National Weather Service National Water Center 1325 East West Highway Silver Spring. MD 20910 Questions?: HDSC.Questions@noaa.gov Disclaimer https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=40.3481 &Ion=-104.9366&data=depth&units=English&series=pds 4/4 Attachment G Table 6-3. Recommended percentage imperviousness values Land Use or Surface Characteristics Percentage Imperviousness (%) Business: Downtown Areas 95 Suburban Arcas 75 Residential lots (lot area only): Single-family 2.5 acres or larger 12 0.75 — 2.5 acres 20 0.25 0.75 acres 30 0.25 acres or less 45 Apartments 75 Industrial: Light areas 80 Heavy areas 90 Parks, cemeteries 10 Playgrounds 25 Schools 55 Railroad yard areas 50 Undeveloped Areas: Historic flow analysis 2 Greenbelts, agricultural 2 Off -site flow analysis (when land use not defined) 45 Streets: Paved 100 Gravel (packed) 40 Drive and walks 90 Roofs 90 Lawns, sandy soil 2 Lawns, clayey soil 2 6-8 Urban Drainage and Flood Control District Urban Storm Drainage Critcria Manual Volume 1 August 2018 Attachment G RUNOFF DRAINAGE CRITERIA MANUAL (V. 1) TABLE RO-5 (Continued) —Runoff Coefficients, C Percentage Imperviousness Type A NRCS Hydrologic Soils Group 2-yr 5-yr 10-yr 25-yr 50-yr 100-yr 0% 0.00 0.00 0.05 0.12 0.16 0.20 5% 0.00 0.02 0.10 0.16 0.20 0.24 10% 0.00 0.06 0.14 0.20 0.24 0.28 15% 0.02 0.10 0.17 0.23 0.27 0.30 20% 0.06 0.13 0.20 0.26 0.30 0.33 25% 0.09 0.16 0.23 0.29 0.32 0.35 30% 0.13 0.19 0.25 0.31 0.34 0.37 35% 0.16 0.22 0.28 0.33 0.36 0.39 40% 0.19 0.25 0.30 0.35 0.38 0.41 45% 0.22 0.27 0.33 0.37 0.40 0.43 50% 0.25 0.30 0.35 0.40 0.42 0.45 55% 0.29 0.33 0.38 0.42 0.45 0.47 60% 0.33 0.37 0.41 0.45 0.47 0.50 65% 0.37 0.41 0.45 0.49 0.51 0.53 70% 0.42 0.45 0.49 0.53 0.54 0.56 75% 0.47 0.50 0.54 0.57 0.59 0.61 80% 0.54 0.56 0.60 0.63 0.64 0.66 85% 0.61 0.63 0.66 0.69 0.70 0.72 90% 0.69 0.71 0.73 0.76 0.77 0.79 95% 0.78 0.80 0.82 0.84 0.85 0.86 100% 0.89 0.90 0.92 0.94 0.95 0.96 RO-12 2007-01 Urban Drainage and Flood Control District Attachment H Composite Impervious Calculations - PS 1 Site April 27, 2020 Area (square feet) Type Unpaved Road Paved Road Gravel Roof Undeveloped Total Area square feet Total Area acres Composite %Impervious %Impervious 40 100 40 90 2 Existing B-10 16608 0 0 0 694249 710857 16.32 2.9 Proposed B-1 15499 1134 1404 0 382838 400875 9.20 3.9 Proposed B-2 0 0 0 0 197845 197845 4.54 2.0 Proposed B-3 0 25367 1357 8900 0 35624 0.82 95.2 Proposed B-4 0 128 617 373 19273 20391 0.47 5.4 Proposed B-5 1089 5899 4134 0 45036 56158 1.29 15.8 Proposed Total 16588 32528 7512 9273 644992 710893 16.32 8.9 Basins Tributary To Pond Proposed B-3 Proposed B-4 0 25367 1357 8900 0 35624 0.82 95.2 0 128 617 373 19273 20391 0.47 5.4 1.3 62.5 Runoff Coefficients Soil Group A % of Total Impervious Area Historic Existing Proposed B-1 Proposed B-2 Proposed B-3 Proposed B-4 Proposed B-5 Undeveloped 2% Impervious 2-yr 5yr 10yr 100-yr 100% 98% 95.5% 100% 0% 95% 80% 0 0.01 0.07 0.23 Unpaved Road 40% Impervious 2-yr 5yr 5yr 100-yr 0% 2% 3.9% 0% 0% 0% 2% 0.19 0.25 0.30 0.41 Gravel 40% Impervious 2-yr 5yr 5yr 100-yr 0% 0% 0.4% ° 0% 4% 3% 7% 0.19 0.25 0.30 0.41 Roof 90% Impervious 2-yr 5yr 5yr 100-yr 0% 0% 0.0% o 0% 25% 0 2% 0% 0.69 0.71 0.73 0.79 Paved Road 100% Impervious 2-yr 5yr 5yr 100-yr 0% 0% 0.3% 0% 71% 1% 11% 0.89 0.9 0.92 0.96 Compostie Runoff Coefficient 2 -year 0.00 0.00 0.01 0.00 0.81 0.02 0.11 5 -year 0.01 0.02 0.02 0.01 0.83 0.04 0.13 10 -year 0.07 0.08 0.08 0.07 0.85 0.09 0.18 100 -year 0.23 0.23 0.24 0.23 0.90 0.25 0.32 Attachment H Area -Weighting for Runoff Coefficient Calculation Project Title: Catchment ID: TWP - PS1 Historic - 10-yr Pond Illustration LE (LE GEND : flow Direction 4 C at ami as B Crtifidary Instructions: For each catchment subarea. enter values for A and C. Subarea Area Runoff Product ID acres Coeff. A I C* CA input input input output Historic 1.30 0.07 0.09 Sum: 1.30 sum: 0.09 Area -Weighted Runoff Coefficient (sum CA/sum A) = 0.07 *See sheet "Design Info" for inperviousness-based runoff coefficient values. 2020.04.27 PS1 Rational Existing. Weighted C H Pond 4/27/2020, 11:01 PM Attachment H Area -Weighting for Runoff Coefficient Calculation Project Title: Catchment ID: TWP - PS1 Existing - 100-yr Illustration Instructions: For each catchment subarea, enter values for A and C. Subarea Area Runoff Product ID acres Coeff. A C* CA input input input output Ex Undev 15.94 0.23 3.67 Ex Unp Rd 0.38 0.41 0.16 sum: 16.32 Sum: 3.82 Area -Weighted Runoff Coefficient (sum CA/sum A) = 0.23 LEcTvD : 'low D it ern on 4 Cat chm ent Boundary. *See sheet "Design Info" for inperviousness-based runoff coefficient values. 2020.04.27 PS1 Rational Existing, Weighted C Exst 4/27/2020, 11:01 PM Attachment H CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment ID: TWP - PS1 Historic - 10-yr Pond I. Catchment Hydrologic Data Catchment ID = Historic Area = Percent Imperviousness = NRCS Soil Type = 1.30 2.00 Acres AA,B,C.orD II. Rainfall Information Design Storm Return Period. Tr = O1 = C2= C3= P1= I (inch/hr) = C1 * P1 /(C2 + Td)^C3 10 years 28.50 10.00 0.786 1.39 inches (input return period for design storm) (input the value of C1) (input the value of C2) (input the value of C3) (input one -hr precipitation --see Sheet "Design Info") III. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient, C = Overide Runoff Coefficient, C = 5-yr. Runoff Coefficient. C-5 = Overide 5-yr. Runoff Coefficient, C = 0.07 (enter an overide C value if desired. or leave blank to accept calculated C.) 0.00 0.01 (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) Illustration LEG - ND O reeting Flow Direction 4 Cat( haste nt Boundary NRCS Land Type Conveyance Heavy Meadow 2.5 Tillage/ Field 5 Short Pasture/ Lawns 7 Nearly Bare Ground 10 Grassed Swales/ Waterways 15 Paved Areas & Shallow Paved Swales (Sheet Flow) 20 Calculations: Reach ID Overland Slope S ft/ft input Length L ft input 5-yr Runoff Coeff C-5 output NRCS Convey- ance input Flow \, elocity V fps output Flow Time Tf minutes output 0.0900 85 0.01 N/A 0.16 8.79 1 0.0500 200 2 3 4 5 Sum 285 IV. Peak Runoff Prediction Rainfall Intensity at Computed Tc. I = Rainfall Intensity at Regional Tc, I = Rainfall Intensity at User -Defined Tc, I = 3.52 inch/hr 3.54 inch/hr 3.52 inch/hr 5.00 1.12 2.98 Computed Tc = Regicnal Tc = User -Entered Tc = Peak Flowrate. Op = Peak Flowrate, Op = Peak Flowrate, Op = 11.77 11.58 11.77 0.32 cfs 0.32 cfs 0.32 cfs 2020.04.27 PS1 Rational Existing, Tc and Peak() H Pond 4/27/2020 11 01 PM Attachment H CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment ID: TWP - PS1 Existing - 100-yr I. Catchment Hydrologic Data Catchment ID = Area = Percent Imperviousness = NRCS Soil Type = Existing 16.32 2.90 A II. Rainfall Information Design Storm Return Period. Tr = C1 = C2= C3= P1= Acres cyo A,B.C or I (inch/hr) = C1 * P1 /(C2 + Td)^C3 100 28.50 10.00 0.786 2.79 years inches (input return period for design storm) (input the value of C1) (input the value of C2) (input the value of C3) (input one -hr precipitation --see Sheet "Design Info") III. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient. C = Overide Runoff Coefficient, C = 5-yr. Runoff Coefficient. C-5 = Overide 5-yr. Runoff Coefficient. C = 0.23 0.02 Reach 3 (enter an overide C value if desired. or leave blank to accept calculated C.) (enter an overide C-5 value if desired. or leave blank to accept calculated C-5.) Illustration Reach 2 3 Reach 1 overland flow LEGEND O Beginning Flow Direction 4 Catchment Boundary NRCS Land Type Conveyance Heavy Meadow 2.5 1 Tillage/ Field 5 Short Pasture/ Lawns 7 Nearly Bare Ground 10 Grassed Swales/ Waterways 15 Paved Areas & Shallow Paved Swales (Sheet Flow) 20 Calculations Reach ID Overland 1 2 3 4 5 Slope S ft/ft input 0.0490 0.0430 Length L ft input 500 970 5-yr Runoff Coeff C-5 output 0.02 Sum 1,470 IV. Peak Runoff Prediction Rainfall Intensity at Computed Tc. I = Rainfall Intensity at Regional Tc, I = Rainfall Intensity at User -Defined Tc, I = 4.29 5.77 5.77 inch/hr inch/hr inch/hr NRCS Convey- ance input N/A 15.00 Flow Velocity V fps output 0.32 3.11 Flow Time Tf minutes output 25.81 5.20 Computed Tc = Regional Tc = User -Entered Tc = Peak Flowrate. Qp = Peak Flowrate. Op = Peak Flowrate. Qp = 31.00 18.17 18.17 16.12 21.65 21.65 cfs cfs cfs 2020.04.27 PS1 Rational Existing. Tc and PeaKQ Exst 4/27/2020. 11 01 PM Attachment H Area -Weighting for Runoff Coefficient Calculation Project Title: Catchment ID: TWP - PS1 Proposed B-1 - 100-yr Illustration LE GEvn : ow D 1Ternon 4 Catchin ent Boundary Instructions: For each catchment subarea. enter values for A and C. Subarea Area Runoff Product ID acres Coeff. A C* CA input input input output B-1 Undev. 8.79 0.23 2.02 B-1 Unp Rd 0.36 0.41 0.15 B-1 Grvl 0.03 0.41 0.01 B-1 Pvd Rd 0.03 0.96 0.02 sum: 9.20 Sum: 2.21 Area -Weighted Runoff Coefficient (sum CA/sum A) = 0.24 *See sheet "Design Info" for inperviousness-based runoff coefficient values. 2020.04.27 PS1 Rational Prop. Weighted C P1 4/27/2020, 11:06 PM Attachment H Area -Weighting for Runoff Coefficient Calculation Project Title: Catchment ID: TWP - PS1 Proposed B-2 - 100-yr Illustration Instructions: For each catchment subarea. enter values for A and C. Subarea Area Runoff Product ID acres Coeff. A C* CA input input input output B-2 Undev. 4.54 0.23 1.04 . Sum: 4.54 Sum: 1.04 Area -Weighted Runoff Coefficient (sum CA/sum A) = 0.23 L.EtvD : Flow Direction 4- C at clam eta B otndary *See sheet "Design Info" for inperviousness-based runoff coefficient values. 2020.04.27 PS1 Rational Prop. Weighted C P2 4/27/2020, 11:06 PM Attachment H Area -Weighting for Runoff Coefficient Calculation Project Title: Catchment ID: TWP - PS1 Proposed B-3 - 100-yr Illustration Instructions: For each catchment subarea. enter values for A and C. LEGEND : Flow Direction 4 Cat am oat 3 otndar ' Subarea Area Runoff Product ID acres Coeff. A C* CA input input input I output B-3 Gravel 0.03 0.41 0.01 B-3 Roof 0.20 0.79 0.16 B-3 Pvd Rd 0.58 0.96 0.56 I sum: 0.82 Sum: 0.73 Area -Weighted Runoff Coefficient (sum CA/sum A) = 0.90 *See sheet "Design Info" for inperviousness-based runoff coefficieit values. 2020.04.27 PS1 Rational Prop, Weighted C P3 4/27/2020, 11:06 PM Attachment H Area -Weighting for Runoff Coefficient Calculation Project Title: Catchment ID: TWP - PS1 Proposed B-4 - 100-yr Illustration Instructions: For each catchment subarea. enter values for A and C. Subarea Area Runoff Product ID acres Coeff. I A C* CA input input input output B-4 Undev 0.44 0.23 0.10 B-4 Gravel 0.01 0.41 0.01 B-4 Roof 0.01 0.79 0.01 B-4 Pvd Rd 0.003 0.96 0.00 sum: 0.47 Sum: 0.12 Area -Weighted Runoff Coefficient (sum CA/sum A) = 0.25 LEAD: Flow Direction Cat dim eut B o�sadar- *See sheet "Design Info" for inperviousness-based runoff coefficient values. 2020.04.27 PS1 Rational Prop. Weighted C P4 4/27/2020, 11:06 PM Attachment H Area -Weighting for Runoff Coefficient Calculation Project Title: Catchment ID: TWP - PS1 Proposed B-5 - 100-yr Illustration LEGEND: E. Direction 4 Cat clan eat Boundary Instructions: For each catchment subarea enter values for A and C. Subarea Area Runoff Product ID acres Coeff. A C* CA input input input output B-5 Undev. 1.03 I 0.22 0.23 B-5 Unp Rd 0.03 0.41 0.01 B-5 Grvl 0.09 0.41 0.04 B-5 Pvd Rd 0.14 0.96 0.13 sum: 1.29 sum: 0.41 Area -Weighted Runoff Coefficient (sum CA/sum A) = 0.32 *See sheet "Design Info" for inperviousness-based runoff coefficie -it values. 2020.04.27 PS1 Rational Prop. Weighted C P5 4/27/2020, 11:06 PM Attachment H CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment ID: TWP - PS1 Proposed B-1 - 100-yr I. Catchment Hydrologic Data Catchment ID = Area = Percent Imperviousness = NRCS Soil Type = Proposed & 9.20 3.90 A II. Rainfall Information Design Storm Return Period. Tr = O1 = C2= C3= P1= 1 Acres 0/0 A B. C. or D I (inch/hr) = C1 * P1 /(C2 + Td)^C3 100 28.50 10.00 0.786 2.79 years inches (input return period for design storm) (input the value of C1) (input the value of C2) (input the value of C3) (input one -hr precipitation --see Sheet "Design Info") III. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient, C = Overide Runoff Coefficient, C = 5-yr. Runoff Coefficient. C-5 = Overide 5-yr. Runoff Coefficient. C = 0.24 0.02 Reach) (enter an overide C value if desired, or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) Illustration Reach 2 Reach 1 overland flow LEGEND 0 Beginning Flow D irec do Catctunent Boundary NRCS Land Type Conveyance Heavy Meadow 2.5 Tillage) Field 5 Short Pasture/ Lawns 7 Nearly Bare Ground 10 Grassed Swales/ Waterways 15 Paved Areas & Shallow Paved Swales (Sheet Flow) 20 Calculations: Reach ID Overland 1 2 3 4 Slope S ft/ft input 0.0490 0.0510 Length L ft input 500 5-yr Runoff Coeff C-5 output 0.02 712 5 Sum IV. Peak Runoff Prediction Rainfall Intensity at Computed Tc. I = Rainfall Intensity at Regional Tc. I = Rainfall Intensity at User -Defined Tc. I = 2020.04.27 PS1 Rational Prop. Tc and PeakQ P1 4.44 6.01 6.01 1,212 inch/hr inch/hr inch/hr NRCS Convey- ance input N/A 15.00 Flow Velocity V fps output 0.32 3.39 Flow Time Tf minutes output 25.81 3.50 Computed Tc = Regional Tc = User -Entered Tc = Peak Flowrate. Qp = Peak Flowrate. Op = Peak Flowrate. Op = 29.31 16.73 16.73 9.80 13.27 13.27 cfs cfs cfs 4/27/2020. 1 1 06 PM Attachment H CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment ID: TWP - PS1 Proposed B-2 - 100-yr I. Catchment Hydrologic Data Catchment ID = Proposed B-2 Area = Percent Imperviousness = NRCS Soil Type = 4.54 Acres 2.00 AA,B.C.orD II. Rainfall Information I (inch/hr) = C1 * P1 /(C2 + Td)^C3 Design Storm Return Period. Tr = C1 = C2= C3= P1= 100 years 28.50 10.00 0.786 2.79 inches (input return period for design storm) (input the value of C1) (input the value of C2) (input the value of C3) (input one -hr precipitation --see Sheet "Design Info") III. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient. C = Overide Runoff Coefficient, C = 5-yr. Runoff Coefficient. C-5 = Overide 5-yr. Runoff Coefficient. C = 0.23 (enter an overide C value if desired. or leave blank to accept calculated C.) Reach :3 0.01 (enter an overide C-5 value if desired. or leave blank to accept calculated C-5.) Illustration Reach 2 (" —p overland Reach 1 flow LEGEND CD Beginning Flow Direction 4 Cate Kline nt Boundary NRCS Land Type Conveyance Heavy Meadow 2.5 Tillage/ Field 5 Short Pasture/ Lawns 7 Nearly Bare Ground 10 Grassed Swales/ Waterways 15 Paved Areas & Shallow Paved Swales (Sheet Flow) 20 Calculations. Reach ID Overland 1 2 3 4 Slope S ft/ft input 0.0490 0.0510 Sum IV. Peak Runoff Prediction Rainfall Intensity at Computed Tc. I = Rainfall Intensity at Regional Tc, I = Rainfall Intensity at User -Defined Tc. I = Length L ft input 500 712 1.212 5-yr Runoff Coeff C-5 output 0.01 4.42 inch/hr 6.01 inch/hr 6.01 inch/hr NRCS Convey- ance input N/A 15.00 Flow Velocity V fps output 0.32 Flow Time Tf minutes output 26.05 3.39 3.50 Computed Tc = Regional Tc = User -Entered Tc = Peak Flowrate. Qp = Peak Flowrate. Qp = Peak Flowrate. Qp = 29.55 16.73 16.73 4.61 cfs 6.27 cfs 6.27 cfs 2020.04.27 PS1 Rational Prop. Tc and PeakQ P2 4/27/2020. 11:06 PM Attachment H CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment ID: TWP - PS1 Proposed B-3 - 100-yr I. Catchment Hydrologic Data Catchment ID = Proposed B-3 Area = Percent Imperviousness = NRCS Soil Type = 0.82 95.20 A Acres 0/0 A. B, C. or D II. Rainfall Information I (inch/hr) = C1 * P1 /(C2 + Td)AC3 Design Storm Return Period. Tr = 01 = C2= C3= P1= 100 28.50 10.00 0.786 2.79 years (input return period for design storm) (input the value of C1) (input the value of C2) (input the value of C3) inches (input one -hr precipitation --see Sheet "Design Info") III. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient, C = Overide Runoff Coefficient, C = 5-yr. Runoff Coefficient. C-5 = Overide 5-yr. Runoff Coefficient. C = k 0.90 0.83 Reach 3 (enter an overide C value if desired. or leave blank to accept calculated C.) (enter an overide C-5 value if desiredor leave blank to accept calculated C-5.) Illustration Re ac h 2 �.�►' Reach 1 overland flmv LEGEND 1.9 Beginning Flow D ire(tio n 4 C atc hnie at Boundary NRCS Land Type Conveyance Heavy Meadow ?.5 Tillage Field 5 Short Pasture/ Lawns 7 Nearly Bare Ground 10 Grassed Swales/ Waterways 15 Paved Areas & Shallow Paved Swales (Sheet Flow) 20 Calculations. Reach ID Overland 1 2 3 4 5 Slope S ft/ft input 0.0370 0.0210 Length L ft input 109 140 Sum IV. Peak Runoff Prediction Rainfall Intensity at Computed Tc. I = Rainfall Intensity at Regional Tc. I = Rainfall Intensity at User -Defined Tc, I = 9.93 7.16 9.46 249 inch/hr inch/hr inch/hr 5-yr Runoff Coeff C-5 output 0.83 NRCS Convey- ance input N/A Flow Velocity V fps output 0.55 20.00 2.90 Computed Tc = Flow Time Tf minutes output 3.30 0.81 4.11 Regional Tc = 11.38 User -Entered Tc = 5.00 Peak Flowrate. Qp = Peak Flowrate. Qp = Peak Flowrate. Qp = 7.33 5.29 6.98 cfs cfs cfs 2020.04.27 PS1 Rational Prop. Tc and PeakQ P3 4/27/2020. 1 1 06 PM Attachment H CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment ID: TWP - PS1 Proposed B-4 - 100-yr I. Catchment Hydrologic Data Catchment ID = Proposed B-4 Area = Percent Imperviousness = NRCS Soil Type = 0.47 5.40 A Acres 0/0 A. B. C. or D II. Rainfall Information I (inch/hr) = C1 * P1 /(C2 + Td)^C3 Design Storm Return Period. Tr = C1 = C2= C3= P1= 100 28.50 10.00 0.786 2.79 years (input return period for design storm) (input the value of C1) (input the value of C2) (input the value of C3) inches (input one -hr precipitation --see Sheet "Design Info") III. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient. C = Overide Runoff Coefficient. C = 5-yr. Runoff Coefficient. C-5 = Overide 5-yr. Runoff Coefficient, C = k 0.25 0.04 Reach 3 (enter an overide C value if desired. or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) Illustration Reach 2 --' Reach 1 overland flow LEGEND O Beginning Flow Dir&tie n Catchment Boundary NRCS Land Type Conveyance Heavy Meadow 2.5 Tillage Field 5 Short Pasture/ Lawns 7 Nearly Bare Ground 10 Grassed Swales/ Waterways 15 Paved Areas & Shallow Paved Swales (Sheet Flow) 20 Calculations. 5 ft/ft input 0.1640 IV. Peak Runoff Prediction Rainfall Intensity at Computed Tc. I = Rainfall Intensity at Regional Tc, I = Rainfall Intensity at User -Defined Tc, I = 7.51 inch/hr 7.27 inch/hr 7.51 inch/hr 5-yr Runoff Coeff C-5 output NRCS Convey- ance input Flow Velocity V fps output Computed Tc = Regional Tc = User -Entered Tc = Peak Flowrate. Qp = Peak Flowrate. Qp = Peak Flowrate. Qp = Flow Time Tf minutes output 10.12 10.98 10.12 0.88 cfs 0.85 cfs 0.88 cfs 2020.04.27 PS1 Rational Prop. Tc and PeakQ P4 4/27/2020. 11-06 PM Attachment H CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment ID: TWP - PS1 Proposed B-5 - 100-yr I. Catchment Hydrologic Data Catchment ID = Proposed B-5 Area = Percent Imperviousness = NRCS Soil Type = 1.29 15.80 A II. Rainfall Information Design Storm Return Period. Tr = 01 = C2= C3= P1= Acres A,B.C.orD I (inch/hr) = C1 x P1 /(C2 + Td)^C3 100 28.50 10.00 0.786 2.79 years inches (input return period for design storm) (input the value of C1) (input the value of C2) (input the value of C3) (input one -hr precipitation --see Sheet "Design Info") III. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient. C = Overide Runoff Coefficient. C = 5-yr. Runoff Coefficient. C-5 = Overide 5-yr. Runoff Coefficient. C = 0.32 0.13 (enter an overide C value if desired. or leave blank to accept calculated C.) (enter an overide C-5 value if desired. or leave blank to accept calculated C-5.) Illustration LEGEND �J Beginning v Flow D irec do n gat Catchment Boundary NRCS Land Type Conveyance I-eavy Meadow 2.5 Tillage/ Field 5 Short Pasture/ Lawns Nearly Bare Ground 10 Grassed Swales/ Waterways 15 Paved Areas & Shallow Paved Swales (Sheet Flow) 20 Calculations: Reach ID Overland 1 Slope S ft/ft input 0.0560 Length L ft input 288 5-yr Runoff Coeff C-5 output NRCS Convey- ance input Flow Velocity V fps output 0.13 N/A 2 3 4 5 Sum 288 IV. Peak Runoff Prediction Rainfall Intensity at Computed To. I = Rainfall Intensity at Regional Tc, I = Rainfall Intensity at User -Defined Tc. I = 5.99 inch/hr 7.11 inch/hr 7.11 inch/hr Flow Time Tf minutes output 16.83 Computed Tc = Regional Tc = User -Entered Tc = Peak Flowrate. Qp = Peak Flowrate. Qp = Peak Flowrate. Qp = 16.83 11.60 11.60 2.47 2.93 2.93 cfs cfs cfs 2020.04.27 PS1 Rational Prop, Tc and Peak() P5 4/27/2020 1 1 06 PM Attachment I DETENTION VOLUME BY THE MODIFIED FAA METHOD Project: TWP PS1 Basin ID: PS1 B-3 and B-4 (For catchments less than 160 acres only. For larger catchments, use hydrograph routine method) (NOTE: for catchments larger than 90 acres, CUHP hydrograph and routing are recommended) Determination of MINOR Detention Volume Using Modified FAA Method Determination of MAJOR Detention Volume Using Modified FAA Method Design Information (Input): Design Information (Input): Catchment Drainage Imperviousness I, = 62.50 percent Catchment Drainage Imperviousness I, = 62.50 percent Catchment Drainage Area A = 1.300 acres Catchment Drainage Area A = 1.300 acres Predevelopment NRCS Soil Group Type = A A, B, C, or D Predevelopment NRCS Sod Group Type = A A, B, C or 0 Return Period for Detention Control T = 100 years (2 5. 10. 25 50, or 100) Return Period for Detention Control T = 10 years (2. 5. 10, 25, 50, or 100) Time of Concentration of Watershed Tc = 10 minutes Time of Concentration of Watershed Tc = 10 minutes Allowable Unit Release Rate q = 0.25 cfs/acre Allowable Und Release Rate q = 0.25 cfs/acre One -hour Precipitation P, = 2.79 inches One -hour Precipitation P, = 1.39 inches Design Rainfall IDF Formula i = C,' P,/(C2+Tc)"C3 Coefficient One C, = 28.50 Design Rainfall IDF Formula i = C,' P,/(C2+T j"C3 _ Coefficient One C, = 28.50 Coefficient Two C2 = 10 Coefficient Two C, = 10 Coefficient Three C3 = 0.789 Coefficient Three C, = 0.789 Determination of Average Outflow from the Basin (Calculated): Determination of Average Outflow fro n the Basin (Calculated): Runoff Coefficient C = 0.51 Runoff Coefficient : = 0.43 Inflow Peak Runoff Qp-in = Allowable Peak Outflow Rate Clp-out = 4.94 0.33 cfs cfs Inflow Peak Runoff Op -in - Allowable Peak Outflow Rate ijp-out = 2.07 0.33 cfs cfs Mod. FAA Minor Storage Volume = 2.185 cubic feet Mod. FAA Major Storage Volume = 7,297 cubic feet Mod. FAA Minor Storage Volume = 0.050 acre -ft Mod. FAA Major Storage Volume = _ 0.166 acre -ft 5 <- Enter Rainfall Duration Incremental Increase Value Here (e.q. 5 for 5 -Minutes) Rainfall Duration minutes (input) Rainfall Intensity inches / hr (output) Inflow Volume acre-feet (output) Adjustment Factor "m" (output) Average Outflow cfs (output) Outflow Volume acre-feet (output) Storage Volume acre-feet (output) Rainfall Duration minutes _ input) Rainfall Intensity inches / hr (output) Inflow Volume acre-feet (output) Adjustment Factor "rn" (output) Average Outflow cfs (output) Outflow Volume acre-feet (output) Storage Volume acre-feet (output) 0.00 0.00 0.000 0.00 0.00 0.000 0.000 0 0.00 0.000 0.00 0.00 0.000 0.000 5.00 4.68 0.018 1.00 0.33 0.002 0.016 5 _ 9.39 0.043 1.00 0.33 0.002 0.041 10.00 3.73 0.029 1.00 0.33 0.004 0.024 10 15 7.48 6.27 0.068 0.086 1.00 0.84 0.33 D.27 0.004 0.006 0.064 0.080 15.00 3.13 0.036 0.84 0.27 0.006 0.030 20.00 2.71 0.042 0.75 0.24 0.007 0.035 20 5.43 0.099 0.75 0.24 0.007 0.092 25.00 2.40 0.046 0.70 0.23 0.008 0.038 25 4.81 0.110 0.70 0.23 0.008 0.102 30.00 2.16 0.050 0.67 0.22 0.009 0.041 30 4.33 0.119 0.67 0.22 0.009 0.110 35.00 1.97 0.053 0.64 0.21 0.010 0.043 35 3.95 0.126 0.64 0.21 0.010 0.116 40.00 1.81 0.056 0.63 0.20 0.011 0.044 40 3.63 0.133 0.63 0.20 0.011 0.121 45.00 1.68 0.058 0.61 0.20 0.012 0.046 45 3.37 0.138 0.61 0.20 0.012 0.126 50.00 1.57 0.060 0.60 0.20 0.013 0.047 50 3.14 0.144 0.60 0.20 0.013 0.130 55.00 1.47 0.062 0.59 0.19 0.015 0.048 55 2.95 0.148 0.59 0.19 0.015 0.134 60.00 1.39 0.064 0.58 0.19 0.016 0.048 60 2.78 0.153 0.58 0.19 0.016 0.137 65.00 1.31 70.00 1.25 0.066 0.067 0.58 0.57 0.19 0.19 0.017 0.018 0.049 0.049 65 70 2.64 2.51 0.157 0.160 0.58 0.57 0.19 0.19 0.017 0.018 0.140 0.142 75.00 1.19 0.069 0.57 0.18 0.019 0.050 75 2.39 0.164 0.57 0.18 0.019 0.145 80.00 1.14 0.070 0.56 0.18 0.020 0.050 80 2.28 0.167 0.56 0.18 0.020 0.147 85.00 1.09 0.071 0.56 0.18 0.021 0.050 85 2.19 0.170 0.56 0.18 0.021 0.149 90.00 1.05 0.073 0.56 0.18 0.022 0.050 90 2.10 0.173 0.56 0.18 0.022 0.150 95.00 1.01 0.074 0.55 0.18 0.024 0.050 95 2.02 0.175 0.55 0.18 0.024 0.152 100.00 0.97 0.075 0.55 0.18 0.025 0.050 100 1.95 0.178 0.55 0.18 0.025 0.153 105.00 0.94 110.00 0.91 0.076 0.077 0.55 0.55 0.18 0.18 0.026 0.027 0.050 0.050 105 110 1.88 0.180 1.82 0.183 0.55 0.55 0.18 0.18 0.026 0.027 0.155 0.156 115.00 0.88 0.078 0.54 0.18 0.028 0.050 115 1.76 0.185 0.54 0.18 0.028 0.157 120.00 0.85 0.079 0.54 0.18 0.029 0.050 120 1.71 0.187 0.54 0.18 0.029 0.158 125.00 0.83 0.080 0.54 0.18 0.030 0.049 125 1.66 0.189 0.54 0.18 0.030 0.159 130.00 0.80 0.080 0.54 0.18 0.031 0.049 130 1.61 0.191 0.54 0.18 0.031 0.160 135.00 0.78 0.081 0.54 0.17 0.032 0.049 135 1.57 0.193 0.54 0.17 0.032 0.161 140.00 0.76 0.082 0.54 0.17 0.034 0.048 140 1.53 0.195 0.54 0.17 0.034 0.161 145.00 0.74 0.083 0.53 0.17 0.035 0.048 145 1.49 0.197 0.53 0.17 0.035 0.162 150.00 0.72 0.083 0.53 0.17 0.036 0.048 150 1.45 0.199 0.53 0.17 0.036 0.163 155.00 0.71 0.084 0.53 0.17 0.037 0.047 155 1.42 0.200 0.53 0.17 0.037 0.163 160.00 0.69 165.00 0.67 0.085 0.086 0.53 0.53 0.17 0.17 0.038 0.039 0.04 7 0.046 160 165 1.38 1.35 0.202 0.53 0.204 0.53 0.17 0.17 0.038 0.039 0.164 0.164 170.00 0.66 0.086 0.53 0.17 0.040 0.046 170 1.32 0.205 0.53 0.17 0.040 0.165 175.00 0.64 0.087 0.53 0.17 0.041 0.045 175 1.29 0.207 0.53 0.17 0.041 0.165 180.00 0.63 0.087 0.53 0.17 0.043 0.045 180 1.27 0.208 0.53 0.17 0.043 0.166 185.00 0.62 0.088 0.53 0.17 0.044 0.044 185 1.24 0.210 0.53 0.17 0.044 0.166 190.00 0.61 0.089 0.53 0.17 0.045 0.044 190 1.22 0.211 0.53 0.17 0.045 0.166 195.00 0.59 0.089 0.53 0.17 0.046 0.043 195 1.19 0.212 0.53 0.17 0.046 0.166 200.00 0.58 0.090 0.53 0.17 0.047 0.043 200 1.17 0.214 0.53 0.17 0.047 0.167 205.00 0.57 0.090 0.52 0.17 0.048 0.042 205 1.15 0.215 0.52 0.17 0.048 0.167 210.00 0.56 0.091 0.52 0.17 0.049 0.042 210 1.13 0.216 0.52 0.17 0.049 0.167 215.00 0.55 220.00 0.54 0.091 0.092 0.52 0.52 0.17 0.17 0.050 0.052 0.041 0.040 215 220 1.11 1.09 0.218 0.52 0.219 0.52 0.17 0.17 0.050 0.052 0.167 0.167 225.00 0.53 0.092 0.52 0.17 0.053 0.040 225 1.07 0.220 0.52 0.17 0.053 0.167 230.00 0.52 0.093 0.52 0.17 0.054 0.039 230 1.05 0.221 0.52 0.17 0.054 0.167 235.00 0.52 0.093 0.52 0.17 0.055 0.039 235 104 0.222 0.52 0.17 0.055 0.167 240.00 0.51 0.094 0.52 0.17 0.056 0.038 240 1.02 0.223 0.52 0.17 0.056 0.168 245.00 0.50 0.094 0.52 0.17 0.057 0.037 245 1.00 0.225 0.52 D.17 0.057 0.168 250.00 0.49 0.095 0.52 0.17 0.058 0.037 250 0.99 0.226 0.52 0.17 0.058 0.167 255.00 0.49 0.095 0.52 0.17 0.059 0.036 255 0.97 0.227 0.52 0.17 0.059 0.167 260.00 0.48 0.096 0.52 0.17 0.060 0.035 260 0.96 0.228 0.52 0.17 0.060 0.167 265.00 0.47 0.096 0.52 0.17 0.062 0.035 265 0.95 0.229 0.52 0.17 0.062 0.167 270.00 0.46 275.00 0.46 0.097 0.097 0.52 0.52 0.17 0.17 0.063 0.064 0.034 0.033 270 275 0.93 0.92 0.230 0.52 0.17 0.063 0.167 0.231 0.52 0.17 0.064 0.167 280.00 0.45 0.097 0.52 0.17 0.065 0.032 280 0.91 0.232 0.52 0.17 0.065 0.167 285.00 0.45 0.098 0.52 0.17 0.066 0.032 285 0.89 0.233 0.52 0.17 0.066 0.167 290.00 0.44 0.098 0.52 0.17 0.067 0.031 290 0.88 0.234 0.52 0.17 0.067 0.167 295.00 0.43 0.099 0.52 0.17 0.068 0.030 295 0.87 0.235 0.52 0.17 0.068 0.167 300.00 0.43 0.099 0 52 0 17 0.069 0.030 300 0.86 0.236 0.52 0 17 0.069 0.166 Mod. FAA Minor Storage Volume (cubic ft.) = 2,185 Mod. FAA Minor Storage Volume (acre -ft.) = 0.0501 UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2.35. Released January 2015 Mod. FAA Major Storage Volume (cubic ft.) = 7,297 Mod. FAA Major Storage Volume (acre -ft.) = 0.1675 2020.04.27 PS1 Detention, Modified FAA 4/27/2020. 11 17 PM Attachment i DETENTION VOLUME BY THE MODIFIED FAA METHOD Project: TWP PS1 Basin ID: PS1 B-3 and B-4 i Inflow and Outflow Volumes vs. Rainfall Duration Volume (acre-feet) 0.25 0.2 0.15 0.1 0.05 0 0 ••••••• ••••••••••••••••••••••••••••• �• • • • • • ••• • c00000OOOOO©OO000OOGOOOOOOOOO O 00 00000000 00000000 00p00 OCOOc 50 100 150 200 Duration (Minutes) 250 300 - I Minor Storm Inflow Volume —Minor Storm Outflow Volume n Minor Storm Storage Volume +Major Storm Inflow Volume — Major Storm Outflow Volume • Major Storm Storage Volume 350 UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2.35. Released January 2015 2020.04 27 PS1 Detention. Modified FAA 4/27/2020 11 17 PM Attachment i STAGE -STORAGE SIZING FOR DETENTION BASINS Project: TWP Basin ID: PS1 Pond Design Information Input): Width of Basin Bottom W = Length of Basin Bottom L = Dam Side -slope (H Vi 4 = Stage -Storage Relationship: A w'l 25.00 60.00 3.00 Side Slope L ft ft ft/ft L Righ Isoscele Gird Check Basin Shape t Triangle s Triangle Rectangle e / Ellipse X Irregular Storage Requirement from Sheet 'Modified FAA': Storage Requirement from Sheet 'Hydrograph': Storage Requirement from Sheet 'Full -Spectrum'. MINOR OR OR OR... OR (Use Overide values in cells G32:G52) MA.;OR 0.05 0. `. 7 acre -ft. acre -ft. acre -ft. Labels for WQCV Minor & Major Storage Stages iinp_.:I Water Surface Elevation ft cinputw Side Slope (H V) ft/ft Below El. Basin Width at Stage ft (output) Basin Length at Stage ft (output) Surface Area at Stage ft2 (output) Surface Area at Stage ft2 User Overide Volume Below Stage ft3 ;output) Surface Area at Stage acres (output) Volume Below Stage acre -ft (output) Target Volumes for WQCV Minor & Major Storage Volumes (for goal seek) 4884.50 (input) 25.00 60.00 1,500.0 1 762 0.040 0.000 4885.00 3.00 28.00 63.00 1,764.0 2,038 950 0.047 0.022 WQCV 4885.50 3.00 31.00 66.00 2,046.0 2.328 2,042 0.053 0.047 4886.00 3.00 34.00 69.00 2346.0 2 633 3,282 0.060 0.075 4886.50 3.00 37.00 72.00 2,664.0 2 951 4,678 0.068 0.107 4887.00 3.00 40.00 75.00 3,000.0 3284 6,237 0.075 0.143 4887.50 3.00 43.00 78.00 3,354.0 3,631 7,965 0.083 0.183 4888.00 3.00 46.00 81.00 3,726.0 3.992 9,871 0.992 0.227 4888.50 3.00 49.00 84.00 4,116.0 4,367 11,961 0; 00 0.275 100-yr 4889.00 3.00 52.00 87.00 4,524.0 4 756 14,242 0.109 0.327 4889.50 3.00 55.00 90.00 4,950.0 5152 16,719 0.118 0.384 4890.00 3.00 58.00 93.00 5,394.0 5, 570 19,399 0.128 0.445 #N/A #NIA #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A #N/A #N/A #N/A #NIA #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NIA #NIA #N/A #N/A #N/A #N/A #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A 2020.04.27 PS1 Detention Basin 4/27/2020, 11 17 PM Attachment i STAGE -STORAGE SIZING FOR DETENTION BASINS Project: TWP Basin ID: PS1 Pond STAGE -STORAGE CURVE FOR THE POND 4890.50 4889.50 4888.50 4887.50 4886.50 4885.50 4884.50 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 Storage (acre-feet) I 2020.04.27 PS1 Detention. Basin 4/27/2020. 11 17 PM Attachment i STAGE -DISCHARGE SIZING OF THE WATER QUALITY CAPTURE VOLUME (WQCV) OUTLET Project: TWP Basin ID: PS1 Pond WQCV Design Volume lincutl: Catchment Imperviousness. I, a Catdmsd Area. A a Depth at WOCV outlet above lowest perforation. H s Vertical distance between rows. h = Number of rows. NL = Orifice discharge coefficient. C, a Slope of Basal Trickle Channel. S Time to Oran the Pond Is Watershed Design Information llnoutl: Percent Sod Type A a Percent Sod Type B = Percent Sod Type C/O a Outlet Design information lOutnutl: 62.5 1.30 1 6.00 4.00 0.60 0.040 40 100 0 0 percent acres feet inches ft /ft hours 96 16 Diameter of holes. D Number of holes per row, N= Height of slot. H = Width of slot. Ws Water Quaky Captive Volume. WQCV Water Quaky Capture Volume (WOCV) Design Vokmme (WQCV / 12 • Area • 1.2) Vol a Outlet area per row, A0 Total opening area at each row based on user -input above, A0 Total opening area at each row based on user -input above. A0 = 0.442 1 Qa inches inches inches 0.269 watershed inches 0.029 acre -feel 0.035 acre-feet 0.15 square inches 0.15 square inches 0.001 square feel • O O o O O A 0 0 O O o O O O O O 000 O O t O O O O O O O O O O O O 0 0 O c =e Perforated Plate examples Central Elevations of Rows of Holes in feet Row 1 Row 2 Row 3 4885.00 4885.50 4888.00 4884.50 0.0000 0.0000 4885.00 0.0000 0.0000 4885.50 0.0036 0.0000 4886.00 0.0051 0.0036 4886.50 0.0063 0.0051 4887.00 0.0073 0.0063 4887.50 0.0081 0.0073 4888.00 0.0089 0.0081 4888.50 0.0096 0.0089 4889.00 0.0103 0.0096 4889.50 0.0103 4890.00 0.0109 0.0109 0.0115 SNA INA *NA PNA Ift4/A *NIA EN/A SNA INA SN/A MIA SNA PNA PN/A SIVA INA ANA Ithi/A INA PNA DNA IN/A VIVA *NA *NA SN/A PNA fIN/A IN/A PNA NWA SN/A SN/A PIA INA INA PNA INA INA SN/A OVA SN/A NNA SNA NIA SN/A SN/A *NIA PIA PIA IN/A INA *NA SNI/A SIA IN/A tIN/A INA *N/A SNA *NA SN/A INA PNA 0.0000 0.0000 0.0000 0.0000 0.0036 0.0051 0.0063 0.0073 0.0081 0.0089 0.0096 0.0103 SN/A CNA INA IN/A PNA MIA ItN/A ItN/A SN/A IN/A *NA SN/A St4/A SN/A SNA *IA SN/A SIV/A SN/A PNA SN/A INA ENA SN/A INA SN/A *NIA IN/A SIV/A *NA *NA PIA Row 4 4886.50 0.0000 0.0000 0.0000 0.0000 0.0000 0.0036 0.0051 0.0063 0.0073 0.0081 0.0089 0.0096 OVA IOWA SN/A IIN/A INA OVA SNA SNA PIA SN/A NNA IIN/A *NA %NA SN/A Row 5 Row 6 Row 7 Row 8 Rove 9 ow 10 Row 11 Row 12 Row 13 Row 14 Row 15 Row 16 Row 17 Row 18 Row 19 Row 20 Row 21 Row 22 Row 23 Row 23 Collection Capacity for Each Row of Holes in es now 0.00 0.00 0.00 0.01 0.02 0.02 0.03 0.03 0.03 0.04 0.04 0.04 INA MNIA 01/A NN/A ANA MN/A ANA NN/A IOWA EWA "NIA *4/A NWA NN/A NWA NWA NWA MIA fWA ANA AIWA NN/A NNIA NWA SWA NWA *4/A DNA NWA NN/A NWA SIA SN/A INA fwA AIWA *NA NIA SN/A SNA NNA SN/A INA NNA INA INA IIN/A OVA Override Area Row 1 Override Area Row 2 Override Area Row 3 Override Area Row 4 Override Area Row 5 Override Area Row 6 Overrode Area Row 7 Override Area Row 8 Override Area Row 9 Override Area Row 10 Override Area Row 11 Override Area Row 12 Override Area Row 13 Override Area Row 14 Override Area Row 15 Override Area Row 16 Override Area Row 17 Override Area Row 18 Override Area Row 19 Override Area Row 20 Overnde Area Row 21 Override Area Row 22 Override Area Row 23 Override Area Row 24 2020.04.27 PSI Detente" V11OCV 4127/2020. 11 17 PM Attachment i STAGE -DISCHARGE SIZING OF THE WATER QUALITY CAPTURE VOLUME (WQCV) OUTLET Project TWP Basin ID PS1 Pond STAGE -DISCHARGE CURVE FOR THE WQCV OUTLET STRUCTURE 4891.00 0. 4890.00 4889.00 4888.00 4) 4.1 01 Co 4- N 488' 70 4886.00 4885.00 4884.00 CO 0 01 :1 o.Q2 0.03 0.03 - : 0. Discharge (cfs) 2020.04 27 PSI Detention. WQCV 4/27/2020. 11 17 PM Attachment i STAGE -DISCHARGE SIZING OF THE WEIRS AND ORIFICES (INLET CONTROL) Project: TWP Basin ID: PSI Pond Current Routing Order is #5 Design Information (Input): Circular Opening OR Rectangular Opening Routing Order a1 (Standasd, tr t► Et. '4 sign a *Stilling v 'r' S EL'WU? ft I 112 WQ n :t '1. Diameter in Inches Width in Feet Length (Height for Vertical) Percentage of Open Area After Trash Rack Reduction Orifice Coefficient Weir Coefficient Orifice Elevation (Bottom for Vertical) Calculation of Collection Capacity: Net Opening Area (after Trash Rack Reduction) OPTIONAL User-Overide Net Opening Area Perimeter as Weir Length OPTIONAL User-Ovende Weir Length Dia. = W= LorH= %open= C„ = Ee= Routing t)rdcr 02 W S EL N4.• v W EL Mom or vWS EL flu V U _ WQ V2 • - • W S Et. Pianos*, fIOfln W EL Maio n W I EL 4t.i Si WI EL Wu Routh :p 14.1a "t Emufa.1 ono nom as rwe- tt7 11; WQ I #1 Honz. #2 Honz. #1 Vert. #2 Vert. 3.50 4.00 4.00 70 100 0.60 0.60 3.00 4889 00 4,888.00 11.20 0.07 13.60 Top Elevation of Vertical Orifice Opening, Top = Center Elevation of Vertical Orifice Opening. Cen = 4888.29 4888.15 inches ft. ft ft sq. ft. sq. ft. ft ft. Routing 5: Water flows separately through WQCV plate, #1 horizontal opening, #2 horizontal openin j, #1 vertical opening, and #2 vertical opening. The sum of all four will be applied to culvert sheet. Horizontal Orifices Vertical Orifices Labels for 1A/QCV. Minor. & Major Storage W.S. Elevations (input) Water Surface Elevation ft (inked) WQCV Plate/Riser Flow cfs (User -linked) #1 Horiz. #1 Honz. Weir Onfice Flow Flow cfs cfs (output) (output) #2 Horiz. Weir Flow cfs (output) #2 Horiz. Orifice Flow cfs (output) #1 Vert. Collection Capacity cfs (output) #2 Vert. Collection Capacity cfs (output) Total Collection Capacity cfs (output) Target Volumes for WQCV. Minor & Major Storage Volumes (link for goal seek, 4884.50 0.00 0.00 0.00 0.00 L 0.00 0.00 0.00 0.00 4885.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 WQCV 4885.50 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4886.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 4886.50 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.02 4887.00 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.02 4887.50 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.03 4888.00 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.03 4888.50 0.03 0.00 0.00 0.00 0.00 0.19 0.00 0.23 100-yr 4889.00 0.04 0.00 0.00 0.00 0.00 0.30 0.00 0.33 4889.50 0.04 14.42 38.13 0.00 0.00 0.37 0.00 14.84 4890.00 0.04 40.80 53.93 0.00 0.00 0.44 0.00 41.28 #NIA #N/A *N/A *N/A #N/A #N/A 0.00 #N/A #N/A #N/A #N/A #N/A *N/A #N/A 0.00 #N/A #N/A #N/A *N/A #N/A *N/A #N/A 0.00 #N/A #N/A MIA #N/A *N/A *NIA #N/A 0.00 #N/A #N/A *N/A #N/A #N/A *N/A #N/A 0.00 #N/A #N/A #N/A *N/A #N/A *N/A #N/A 0.00 #N/A #N/A #N/A #N/A #N/A #N/A #N/A 0.00 #N/A #N/A *N/A #N/A #N/A *N/A #N/A 0.00 #N/A #N/A *N/A #N/A *N/A #N/A #N/A 0.00 4 #N/A #N/A #N/A #N/A *NIA *N/A #N/A 0.00 p #N/A #N/A #N/A #N/A *N/A #N/A *N/A 0.00 #N/A #N/A #NIA #N/A #N/A #N/A #N/A 0.00 #N/A #N/A #N/A #N/A *N/A *N/A #N/A 0.00 #N/A #N/A *N/A *N/A #N/A *N/A #N/A 0.00 I #N/A #N/A #N/A #N/A #N/A #N/A *N/A 0.00 #N/A #N/A #N/A *NIA #NIA *N/A *N/A 0.00 #N/A #N/A #N/A #N/A #N/A *N/A #N/A 0.00 #N/A #N/A #N/A #N/A #N/A *N/A #N/A 0.00 #N/A #N /A #N/A #N/A *N/A #N/A *N/A 0.00 #N/A #NIA #N/A *N/A *N/A *NIA *N/A 0.00 #N/A #N/A *N/A *N/A *N/A #N/A #N/A 0.00 I #N/A #N/A #N/A #N/A #N/A #N/A #N/A 0.00 #NIA #N/A #N/A #N/A *N/A #N/A #N/A 0.00 #N/A #N/A #NIA #N/A #N/A *N/A *N/A 0.00 #N/A *NIA #N/A #N/A *N/A *N/A #N/A 0.00 #N/A #N/A #NIA #N/A #N/A *N/A #N/A 0.00 #N/A #N/A #N/A *N/A *N/A *NIA #N/A 0.00 1 #N/A #N/A #N/A #N/A *N/A *NIA #N/A 0.00 #N/A #N/A *N/A #N/A #N/A #N/A #N/A 0.00 #N/A #N/A #N/A *NIA *NIA *N/A #N/A 0.00 #N/A #N/A #N/A #N/A #N/A #N/A *N/A 0.00 #N/A #N/A _ #N/A #N/A #N/A *NIA #N/A 0.00 #N/A 2020 04.27 PS 1 Detention, Outlet 4/27/2020, 11 17 PM Attachment i STAGE -DISCHARGE SIZING OF THE WEIRS AND ORIFICES (INLET CONTROL) Project: TWP Basin ID: PSI Pond I STAGE -DISCHARGE CURVE FOR THE OUTLET STRUCTURE 4890.5 4889.5 a) a) a) • a) O) Co 40 5 4888.5 4887.5 • • 4886.5 • • 4885.5 • • 4884.5 • _ 0 5 10 15 20 25 30 35 40 4 Discharge (cfs) H 2020.04.27 PS 1 Detention, Outlet 4/27/2020, 11 17 PM Attachment i STAGE -DISCHARGE SIZING OF THE OUTLET CULVERT (INLET vs. OUTLET CONTROL WITH TAILWATER EFFECTS) Project: TWP Basin ID: PS1 Pond Status: Culvert Data is valid' Design Information (Input): Circular Culvert Barrel Diameter in Inches Circular Culvert Inlet Edge Type (choose from pull -down list) OR: Box Culvert. Barrel Height (Rise) in Feet Box Culvert: Barrel Width (Span) in Feet Box Culvert Inlet Edge Type (choose from pull -down list) Number of Barrels Inlet Elevation at Culvert Invert Outlet Elevation at Culvert Invert Culvert Length in Feet Manning's Roughness Bend Loss Coefficient E>at Loss Coefficient Design Information (calculated): Entrance Loss Coefficient Friction Loss Coefficient Sum of All Loss Coefficients Orifice Inlet Condition Coefficient Minimum Energy Condition Coefficient Calculations of Culvert Capacity (output): Gas lbw Ss D niben , sttdn f •1 s c 18 Square End with Headwall Height (Rise) = Width (Span) = Square Edge w/ 90-15 deg. Flared Wingwall No = = = L= n= Kb= K, _ K1. = Kt = K5= C,t = 1 4884.50 4883.00 41.0 0.0130 0.00 1.00 0.50 0.74 2.24 0.86 -0.09 %Ma In. ft. ft. fl. elev. ft. elev. f1. Water Surface Elevation From Sheet "Basin" (ft., linked) Tailwater Surface Elevation ft (input if known) Culvert Inlet -Control Flowrate cfs (output) Culvert Outlet -Control Flow rate cfs (output) Flowrate Into Culvert From Sheet "Outlet" (cfs, linked) Controlling Culvert Flow rate cfs (output) Inlet Equation Used (output) 4884.50 0.00 0.00 0.00 0.00 0.00 No Flow (WS < inlet) 4885.00 0.00 1.10 7.88 0.00 0.00 Min. Energy. Eqn. 4885.50 0.00 3.50 8.81 0.00 0.00 Regression Eqn. 4886.00 0.00 6.40 9.65 0.01 0.01 Regression Eqn. 4886.50 0.00 9.00 11.14 0.02 0.02 Regression Eqn. 4887.00 0.00 11.00 12.46 0.02 0.02 Regression Eqn. 4887.50 0.00 12.70 13.64 0.03 0.03 Regression Eqn. 4888.00 0.00 14.20 14.74 0.03 0.03 Regression Eqn. 4888.50 0.00 15.50 15.75 0.23 0.23 Regression Eqn. 4889.00 0.00 16.70 16.71 0.33 0.33 Regression Eqn. 4889.50 0.00 17.80 17.61 14.84 14.84 Orifice Eqn. 4890.00 0.00 18.80 18.47 41.28 18.47 Orifice Eqn. 0.00 0.00 0.00 0.00 #NIA #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (VVS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0 00 0 00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #NIA #NIA No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 2020 04 27 PS1 Detention Culvert 4/27/2020, 11.17 PM Attachment i STAGE -DISCHARGE SIZING OF THE OUTLET CULVERT (INLET vs. OUTLET CONTROL WITH TAILWATER EFFECTS) Project: TWP Basin ID: PS1 Pond I STAGE -DISCHARGE CURVE FOR THE FINAL OUTLET PIPE CULVERT 4890.50 4889.50 4888.50 a) C) a) a) a) 4887.50 1 ♦ 4886.50 ♦ 4885.50 • • 4884.50 • _ 0.00 5.00 10.00 Discharge (cfs) 15.00 20.00 2020.04.27 Ps1 Detention. Culvert 4/27/2020, 11 17 PM Attachment i STAGE -DISCHARGE SIZING OF THE SPILLWAY Project: TwP Basin ID: PSi Pond 4. CIewe es. •N VT Design Information (input): Bottom Length of Weir Angle of Side Slope Weir Elev. for Weir Crest Coef. for Rectangular Weir Coef. for Trapezoidal Weir Calculation of Spillway Capacity (output): L= Angle = EL. Crest = C,,, = Ct _ 10.00 71.57 4.889.00 3.00 3.00 Water Surface Elevation ft. (linked) Rect. Weir Flowrate cfs (output) Triangle Weir Flowrate cfs (output) Total Spillway Release cfs (output) Total Pond Release cfs (output) 4884.50 0.00 0.00 0.00 0.00 4885.00 0.00 0.00 0.00 0.00 4885.50 0.00 0.00 0.00 0.00 4886.00 0.00 0.00 0.00 0.01 4886.50 0.00 0.00 0.00 0.02 4887.00 0.00 0.00 0.00 0.02 4887.50 0.00 0.00 0.00 0.03 4888.00 0.00 0.00 0.00 0.03 4888.50 0.00 0.00 0.00 0.23 4889.00 0.00 0.00 0.00 0.33 4889.50 10.61 1.59 12.20 27.04 4890.00 30.00 9.00 39.00 57.48 #N/A #N/A #N/A #NIA #N!A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N!A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N!A #N/A #N/A #N/A #N/A #N!A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A feet degrees feet 2020.04.27 PS1 Detention, Spillway 4/27/2020, 11:17 PM Attachment i STAGE -DISCHARGE SIZING OF THE SPILLWAY Project: TWP Basin ID: PS1 Pond r STAGE -STORAGE -DISCHARGE CURVES FOR THE POND Storage (Acre -Feet) 0 0.1 0.2 0.3 0.4 0.5 4890.5 4889.5 K 4888.5 4887.5 _ r 4886.5 r _ r 4885.5 III _ r 4884.5 4- -1 10 20 30 40 50 60 70 Pond Discharge (cfs) -t- 'DIAL DISCHARGE SPILLWAY DISCHARGE POND STORAGE 2020.04.27 PS1 Detention. Spillway 4/27/2020.. 11:17 PM PRELIMINARY DRAINAGE REPORT Thornton Water Project Pump Station 2 Site Prepared for Weld County on behalf of City of Thornton May 2020 CH2M Hill Engineers, Inc. 9191 South Jamaica Street Englewood, CO 80112 TWP USR SUPPLEMENT SECTION 16 PRELIMINARY DRAINAGE REPORT PUMP STATION 2 PS2-1 THORNTON WATER PROJECT PRELIMINARY DRAINAGE REPORT- PUMP STATION 2 SITE Description of Project Thornton is proposing to locate and construct the Thornton Water Project (TWP), which is a water delivery system that will convey high quality domestic water Thornton purchased in the mid -1980's from the Water Supply and Storage Company (WSSC) system, located in Larimer County, to Thornton. This preliminary drainage report has been prepared in accordance with the requirements of Weld County Code 8-11-40, Section O, and satisfies the requirements of Public Works Question 4 of the USR Questionnaire. This report is for the Pump Station 2 site, which is Located north of County Road 2 and east of County Road 17 (southwest quarter of Section 33 of Township 1 North, Range 67 West). Approximately 275 feet north of the site is an unnamed tributary to Big Dry Creek, however there are no regulatory floodplains (see Attachment A: FEMA Floodplain Map) within or adjacent to the site (FEMA Zone X). There are no irrigation facilities on or adjacent to the site. The existing condition of the site is undeveloped and the soils on the site are hydrologic group C (See Attachment B: NRCS Soils Map and Description). The property that includes Pump Station 2 is 8.4 acres, and the pump station project area is 4.5 acres of the property. Within the project area, 1.8 acres will be developed with pavement, gravel, and rooftops. The project is located in a non -urbanizing area. Hydrology and Hydraulic Analysis The existing drainage patterns on the site are generally from south to north toward the tributary to the north of the site (See Attachment C: Existing Site Drainage). No offsite drainage enters the site. In the proposed condition the drainage pattern will remain the same with a detention basin proposed at the north end of the site to provide water quality capture volume and detention prior to discharging from the site (See Attachment D: Preliminary Drainage Plan). Offsite flows currently in the roadside ditches south and west of the project area will be conveyed across the site driveway. The existing and proposed conditions were analyzed using UD Rational version 1.02a (2005) and UD Detention version 2.35 (2015). Rainfall depths were taken from NOAA Atlas 14 (See Attachment E: NOAA 14 Precipitation Data). In the existing condition the site is 2% impervious, and the construction of the pump station and roads and facilities will increase the imperviousness of the pump station project area to 42%. A detention pond is provided for the developed portions of the site (2.6 acres and 55% impervious). Undeveloped portions of the site and a portion of the site near the entrance will drain undetained in existing flow patterns. Please see Attachment F: UDFCD Recommended Percentage Imperviousness Values and Runoff Coefficients and Attachment G: Imperviousness and Rational Calculations . In order to comply with Weld County Code 8-11-40, Section D, the detention pond provided for this non -urbanizing area provides detention of runoff from the 1 -hour, 100 -year storm and releases the detained water at the historic runoff rate of the 1 -hour, 10 -year storm (see Attachment H: UDFCD Detention Calculations). TWP USR SUPPLEMENT SECTION 16 PRELIMINARY DRAINAGE REPORT PUMP STATION 2 PS2-2 THORNTON WATER PROJECT PRELIMINARY DRAINAGE REPORT- PUMP STATION 2 SITE Conclusion This preliminary drainage report for Pump Station 2 documents the feasibility of the preliminary drainage plan and ensures that the detention volumes can meet the requirements of the Weld County Code and State of Colorado. Final design of the drainage infrastructure will be included in a final drainage report and will include final grading and site layout, additional design of the pond outlet structure and configuration, and sizing for storm drain pipes and swales throughout the site. A maintenance plan for the storm drainage and detention system will also be included with the final drainage report. It is anticipated that onsite inspection, cleaning of sediment and debris, and vegetation maintenance should occur at least annually with repairs performed as the need for them is identified. Attachments Attachment A: FEMA Floodplain Map Attachment B: NRCS Soils Map and Description Attachment C: Existing Site Drainage Attachment D: Preliminary Drainage Plan Attachment E: NOAA 14 Precipitation Data Attachment F: UDFCD Recommended Percentage Imperviousness Values and Runoff Coefficients Attachment G: Imperviousness and Rational Calculations Attachment H: UDFCD Detention Calculations TWP USR SUPPLEMENT SECTION 16 PRELIMINARY DRAINAGE REPORT PUMP STATION 2 PS2-3 Attachment A National Flood Hazard Layer FIRMette 40 0'19.54"N 104 54'32.55"W 39°59'51.98"N T1N R67W S32 0 250 500 T015 F:67W S5 1.000 AREA @FrMINIMAL FLOOD 1,500 Zone e ',X' WW eLF.D 08123C2100E eft 1 /20/2016 Feet 2,000 HAZARD T1 N R67W S33 08001O307H eff..3/5/2007 1:6,000 1015 RGTW S4 FEMA Legend SEE FIS REPORT FOR DETAILED LEGEND AND INDEX MAP FOR FIRM PANEL LAYOUT SPECIAL FLOOD HAZARD AREAS Without Base Flood Elevation (BFE) Zone 4. k. 499 With BFE or Depth Zone 4E. 40. An. YE, 41? Regulatory Floodway OTHER AREAS OF FLOOD HAZARD /V1.,bu SSet:S07UL I Pt, 0.2% Annual Chance Flood Hazard, Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mile Future Conditions 1% Annual Chance Flood Hazard Area with Reduced Flood Risk due to Levee. See Notes. Lk Area with Flood Risk due to Levee .o SCREEN! Area of Minimal Flood Hazard Effective LOMRs OTHER AREAS Area of Undetermined Flood Hazard GENERAL STRUCTURES OTHER FEATURES MAP PANELS U - Channel, Culvert, or Storm Sewer i i i i i i Levee. Dike, or Floodwall O 20.2 17.5 0 - St) Cross Sections with 1% Annual Chance Water Surface Elevation Coastal Transect Base Flood Elevation Line (BFE) Limit of Study Jurisdiction Boundary Coastal Transect Baseline Profile Baseline Hydrographic Feature Digital Data Available No Digital Data Available Unmapped N The pin displayed on the map is an approximate point selected by the user and does not represent an authoritative property location. This map complies with FEMA's standards for the use of digital flood maps if it is not void as described below. The basemap shown complies with FEMA's basemap accuracy standards The flood hazard information is derived directly from the authoritative NFHL web services provided by FEMA. This map was exported on 2/25/2020 at 4:58:10 PM and does not reflect changes or amendments subsequent to this date and time The NFHL and effective information may change or become superseded by new data over time. This map image is void if the one or more of the following map elements do not appear basemap imagery, flood zone labels, legend, scale bar, map creation date, community identifiers. FIRM panel number, and FIRM effective date. Map images for unmapped and unmodernized areas cannot be used for regulatory purposes. Attachment B 40° 0 13 N 1 0 0 39° 59' 59" N 3 Hydrologic Soil Group —Adams County Area, Parts of Adams and Denver Counties, Colorado: and Weld County, ... (PS2 Site) 506100 a peoa A;unoo 508150 Map Scale: 1:2,070 if punted on A portrait (8.5" x 11") sheet. N 0 30 60 120 508250 Meters 180 Feet 0 100 200 400 600 Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84 ° 0 506350 40° 0 13 N 8 0 0 39° 59' 59" N Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey 2/17/2020 Page 1 of 5 Attachment B Hydrologic Soil Group —Adams County Area, Parts of Adams and Denver Counties. Colorado. and Weld County. Colorado. Southern Part (PS2 Site) MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOl) Soils Soil Rating Polygons A ND 0 B B/D C 0/0 D Not rated or not available Soil Rating Lines slot A .1,r AID .� B ~IP B/D ,w C ,N.** c/o D eh Not rated or not available Soil Rating Points a a • • A A/D B 0 0 0 C The soil surveys that comprise your AOI were mapped at scales ranging from 1 20 000 to 1 24 000. C/D D Not rated or not available Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography Warning Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils hat could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map. Natural Resources Conservation Service Web Soil Survey JRL. Coordinate System Web Mercator (EPSG 3857) Maps from the Web Soil Survey are based on the Web Mercator projection. which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculat ons of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version da-e(s) listed below. Soil Survey Area. Adams County Area, Parts of Adams and Denver Counties, Colorado Survey Area Data Version 16, Sep 12, 2019 Soil Survey Area. Weld County. Colorado, Southern Part Survey Area Data Version 18, Sep 13, 2019 Your area of interest (AOI) includes more than one soil survey area. These survey areas may have been mapped at different scales. with a different land use in mind, at different times. or at different levels of detail. This may result in map unit symbols. soil properties, and interpretations that do not completely agree across soil survey area boundanes. BID Soil map units a -e labeled (as space allows) for map scales 1 50.000 or larger. Date(s) aerial images were photographed Oct 20 2018 —Oct 26, 2018 Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey 2/17/2020 Page 2 of 5 Attachment B Hydrologic Soil Group —Adams County Area, Parts of Adams and Denver Counties, Colorado; and Weld County, Colorado, Southern Part (PS2 Site) MAP LEGEND MAP INFORMATION The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey 2/17/2020 Page 3 of 5 Attachment B Hydrologic Soil Group —Adams County Area, Parts of Adams and Denver Counties, Colorado; PS2 Site and Weld County, Colorado, Southern Part Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI ReD Renohill loam, 3 to 9 percent slopes D 0.1 0.6% UIC Ulm loam, 3 to 5 percent slopes C 0.9 5.9% Subtotals for Soil Survey Area 1.0 6.5% Totals for Area of Interest 16.0 100.0% Map unit symbol Map unit name Rating Acres in AOI Percent of AOI 40 Nunn loam, 1 to 3 percent slopes C 0.0 0.1% 57 Renohill clay loam, 3 to 9 percent slopes D 1.2 7.2% 67 Ulm clay loam, 3 to 5 percent slopes C 13.8 86.2% Subtotals for Soil Survey Area 15.0 93.5% Totals for Area of Interest 16.0 100.0% Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey 2/17/2020 Page 4 of 5 Attachment B Hydrologic Soil Group —Adams County Area, Parts of Adams and Denver Counties, Colorado; PS2 Site and Weld County, Colorado, Southern Part Description Hydrologic soil groups are based on estimates of runoff potential. Soils are assigned to one of four groups according to the rate of water infiltration when the soils are not protected by vegetation, are thoroughly wet, and receive precipitation from long -duration storms. The soils in the United States are assigned to four groups (A, B, C, and D) and three dual classes (A/D, B/D, and C/D). The groups are defined as follows: Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly wet. These consist mainly of deep, well drained to excessively drained sands or gravelly sands. These soils have a high rate of water transmission. Group B. Soils having a moderate infiltration rate when thoroughly wet. These consist chiefly of moderately deep or deep, moderately well drained or well drained soils that have moderately fine texture to moderately coarse texture. These soils have a moderate rate of water transmission. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist chiefly of soils having a layer that impedes the downward movement of water or soils of moderately fine texture or fine texture. These soils have a slow rate of water transmission. Group D. Soils having a very slow infiltration rate (high runoff potential) when thoroughly wet. These consist chiefly of clays that have a high shrink -swell potential, soils that have a high water table, soils that have a claypan or clay layer at or near the surface, and soils that are shallow over nearly impervious material. These soils have a very slow rate of water transmission. If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is for drained areas and the second is for undrained areas. Only the soils that in their natural condition are in group D are assigned to dual classes. Rating Options Aggregation Method: Dominant Condition Component Percent Cutoff- None Specified Tie -break Rule: Higher Natural Resources Web Soil Survey Conservation Service National Cooperative Soil Survey 2/17/2020 Page 5 of 5 r <,-,.. %• . %� .'��•' .-->_. ��\ Yom/ J r v - ' �� I 2 ) 1 t $ ISSUED FOR PERMIT NOT FOR CONSTRUCTION C r ,fir- _ n. • - l - '.�\� ' \, \\:� �.•Z Y� 1 j �' �3 ;'1].; . ��1 1. y - \ .. ..'. �., • ,. •• ` l �- - ,....w-•"4:441,7.:;2"44... :•i•. --,`�`\`—` - -;---7t-141- `� `1.�` _ • �'a•�a e.• •-.,- ``4 may . ( !' - ; `� :. . J S 1 o lY .� - �___....-..0 war ` .� ; ; --- _ _ rr: Yid •1r.�` i,t. z .s 'r..,,__"- ._.--.��. .. -.:: w -c \' y r ' �'>� 1 _:-_ .:e•-•••"-- •.}[ /1 Vme ,/rte-^ �' 'ire .•i-.�,-,..........-r--•"—•••••........-.............ci `4'/..Jr `'-y--^--•.----y"-✓ -r,1 •Y+r Ja �L'• 'l.1N.�. \ r 1'"-v. - 4. 4 IA` '- OB1tl110Uf �ti191i1013 GI= O[rS ti /JJ//,•`�-�.'.: / -44,j4.2.,.--;„? t." 4 {`j 'rd 1 ----+�-�"'�•./.�_ Z e i�%♦- ti• :F\ r R 1 •O ¢ "! 9 ....`4^.4.4...4�'^..-,... r 1 l ! / ) ��f i 4. x.: 1 ter. ! fr' ^.''. .� ,/ '_—�•+.�''^ ...,_•••„•�_••�^ ti._I- .//1../ _ef •f"a,.,. �')r1.. .. ~ I6 K) iR a •a i c .=! 1. ! f/ •"- � f - ` = C . i - -' -. - _ t.�'"Y.-yam ...•.:._'' , f t I" - f - - 06 IL C :. c: 1 yr' , _ _—� .. �. „.- ,--.----._- _,�..,- - - e- ,.---m-- r _ §. =` ,..+- `/ -+ /� tee./ f." `iM .. > \ v ... �. ow.- = ..- .. ....•,.. t ��„_ ,t_ t• % /�f�" ''� — -'_ •. f '. f �. V'r y - - _ / PRELIMINARY 'OMD DESIQM TRIBUTARY AREA: LSS ACRES p = it • c , t 4 i_ - r� 1./..?,..9' ; •, e^B .;:•-. - \♦r % �/ �. t.,Z TRIBUTARY AREA pdPFR'gOUSNf55: $4.6 Y. _ _-.• .1 - �- ',.,,« - f i� /f /WI(/ �� ->.`. .. - 140-sR VOt Imo' Q -'W AC.FT 140-vRPEAKDIS.JiAPCrE i.tit r'FS• c.. �.s riJ!tti ` -' - i - • ` i• !' �� .� . - - - A6 ACRES )•. tuRFRvIOUS W '� y1. // / 1 t . -� '• � w // 1 Q -• � VAT . . ., '4' ! �. � _: ,� z o 1. -f:ItN I _ \,, --�,.,...„ ~` ��., J/i•/ M�. r �, • i '�►ui*1Av �``........, .,._ �_ - t.i ^`' --,-.•'^.. / r- , r ` `l. a. ��Y� .�\li. • Y18.8ASYN NUMBER IC J2 D AGE PLAN a .. �' ✓1 '�'' ..�'.:`1- �.. .. `T •_--• .• ,•}• Na. NNN .---• a 3J 4' 'It'll 'T.I. ti.,,. K \. C3 tee ._ _ ". •n - .. - ►. Ly -- •--• - Zr.. Z .),•,.lY� ¢ O I-- F._—• PV/ - -.. II `a.:. - l --=.a -. - - ..�. AREA !ACRES' I- W Q -�.�• Rwti ----_,.�S :4e+---- .kr..-v-`- -s -- I - t. t-. , -- - . s THORNION AA, PUMP ST. ATTACHI PRELIMINARY DI ' ,ems .. " �w• _ I .' _ r r '' ..•. ys-- �' 11',+ io, { ,... _' EYLSTW(i FLOW PAIN 1101..-Y y clib %,,. ; . �y>'. Ir.1 A ,;. '' .- - ...., _ I... .. ig ti -, - - SUB -BASIN BOUNDARY ;`. �; p A DE -SKIN POINT • - :> % - -•. .mss. ,•. s. ` � - _ Y- t• - EXg7 CONTOURS - <XSt GAS .a TF H. GS ty OF14Me. 'lrAv�•.. S' 1 ` �Z'-'�mlrsiP �R`Y . - -1/41 ^ .1 -. - -. - — t, -. _0 DATE APRIL 2020 4.. • . e 0 100 2W 000 PRO) .71Yrr! .4 .- .. - ., - ... - .... -. Scale InFvet SHEET d SPV(URt. :PWPATH :_ILENANE- SP-C-flo, sgn PLOT DATE: 2024`C112I PLOT TIME: 10.^Ir1A AN 2/5/2020 Precipitation Frequency Data Server Attachment E NOAA Atlas 14, Volume 8, Version 2 Location name: Brighton, Colorado, USA* Latitude: 40.0013°, Longitude: -104.9041° Elevation: 5113.71 ft** * source: ESRI Maps ** source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES Sanja Perica. Deborah Martin, Sandra Pavlovic, Ishani Roy, Michael St. Laurent, Carl Trypaluk. Dale Unruh, Michael Yekta, Geoffery Bonnin NOAA, National Weather Service, Silver Spring. Maryland PF tabular I PF graphical I Maps & aerials PF tabular PDS-based point precipitation frequency estimates with 90% confideice intervals (in inches)1 LAverage recurrence interval (years) Duration 1 [ 2 I 5 I 10 L 50 IL 100 I 200 I 500 _) 1000 5 -min 0.225 (0.173-0.292) 0.275 (0.211-0.358) 0.371 (0.284-0.484) 0.462 (0.352-0.606) 0.607 ,(0.456-0.850) 0.732 (0.535-1.03) 0.871 (0.615-1.23) 1.02 (0.696-1.53) 1.25 (0.815-1.91) 1.43 (0.906-2.20)I 10 -min 0.329 (0.253-0.428) 0.403 (0.310-0.524) 0.543 (0.415-0.708) 0.677 (0.515-0.888) 0.888 (0.668-1.24) 1.07 (0.783-1.51) 1.27 (0.901-1.85) 1.50 (1.02-2.23) (1.19-2.79) 1.83 2.10 (1.33-3.22) 15 -min 0.402 (0.309-0.522) 0.491 (0.377-0.640) 0.662 0.825 (0.629-1.08) 1.08 (0.815-1.52) 1.31 1.56 1.83 (1.24-2.72) (1.46-3.41) 2.23 (1.62-3.93) 2.56 30 -min I 0.554 LkQA2s 0.721) 0.674 (0.518 0.878) 0.903 (0.692 1.18) I 1.12 (0,856 1A7) 1.47 4SL11 2.07) 1.78 • (1.30 2.51)a 2.12 (1.49 3.06) 2.49 s (1.69 3.,70) 3.03 (t98 11.64} 3.48 (2.30 5%31) r 60 -min 0.677 (0.521-0.880) 0.826 (0.634-1.08) 1.11 (0.849-1.45) 1.38 (1.05-1.81) 1.81 (1.36-2.54) 2.19 (1.60-3.09) 2.60 (1.84-3.76) 3.06 (2.08-4.55) 3.72 (2.43-5.69) 4.27 (2.70-6.56) ` 2 -hr 0.800` (0.621-1.03) 0.977 (0.758-1.26) 1.31 (1.02-1.70) 1.64 (1.26-2.12) 2.15 (1.63-2.97) 2.59 (1.91-3.62) 3.08 (2.20-4.41) 3.63 (2.49-5.33) - 4.41 (2.92-6.66) 5.06 (3.24-7.67) 3 -hr 0.863 (0.675-1.10) 1.06 (0.824-1.35) 1.42 (1.10-1.82) 1.76 (1.37-2.27) 2.31 (1.76-3.17) 2.78 (2.07-3.85) 3.30 (2.37-4.61) 3.88 (2.68-5.66) 4.72 (3.13-7.06) 5.41 (3.48-8.12) 6 -hr 1.02 (0.809-1.30) 1.24 (0.976-1.56) (1.29-2.07) 1.64 2.01 2.61 (2.01-3.53) 3.12 (2.34-4.27) 3.69 (2.68-5.11) 4.31 (3.01-6.20) 5.22 (3.50-7.70) 5.96 (3.88-8.84) 12 -hr 1.27 (1.01-1.59) 1.50 (1.20-1.88) 1.94 (1.54-2.43) 2.35 (1.86-2.96) 2.98 (2.32-3.98) 3.53 (2.67-4.75) 4.13 (3.03-5.70) 4.79 (3.37-6.78) 5.74 (3.89-8.35) 6.52 (4.28-9.53) 24 -hr 1.53 (1.23-1.89) 1.82 (1.47-2.25) 2.34 (1.88-2.90) 2.80 (2.24-3.49) 3.50 (2.73-4.57) 4.08 (3.11-5.38) 4.69 (3.46-6.35) 5.36 (3.80-7.45) 6.30 (4.31-9.00) 7.05 (4.69-10.2) 1 2 -day 1.75 (1.43-2.13) 2.13 (1.73-2.60) 2.77 (2.25-3.39) 3.31 (2.67-4.07) 4.08 (3.20-5.21) 4.69 (3.59-6.06) 5.31 (3.94-7.05) 5.96 (4.26-8.12)i 6.84 (4.71-9.59) 7.53 (5.06-10.7) 3 -day 1.91 (1.56-2.31) 2.29 (1.88-2.78) 2.94 (2.40-3.58) 3.49 (2.84-4.27) 4.27 (3.37-5.42) 4.89 (3.78-6.28) 5.53 (4.13-7.27) 6.18 (4.45-8.36) 7.08 (4.91-9.84) 7.77 (5.25-11.0) 4 -day 2.03 (1.68-2.45) 2.42 (1.99-2.92) 3.06 (2.51-3.70) 3.61 (2.95-4.39) 4.39 5.66 (4.25-7.40) 6.32 (4.57-8.50) 7.23 (5.04-10.00) 7.94 (5.39-11.1) 7 -day l 2.33 (1.94-2.78) 2.72 (2.26-3.25) 3.38 (2.80-4.05) 3.94 + (3.24-4.74) 4.73 (3.79-5.91) 5.37 (4.20-6.79) 6.02 (4.56-7.80) 6.70 (4.89-8.91) 7.63L (5.36-10.4) 8.35 (5.72-11.6) 10 -day (2.16-3.07) 2.58 2.99 (2.50-3.55) 3.67 (3.06-4.38) 4.25 (3.52-5.09) 5.07 (4.08-6.27) 5.71 (4.50-7.17) 6.37 (4.86-8.19) (5.18-9.31) 7.06 7.99 (5.65-10.8) 8.71 (6.00-12.0) 20 -day 3.31 3.78 (3.19-4.44) 4.55 11 (3.83-5.36) 5.19 (4.35-6.14) 6.08 (4.94-7.40) 6.77 (5.38-8.36) 7.47 (5.75-9.44) I 8.18 (6.06-10.6) 9.13 (6.52-12.2) I 9.85 (6.87-13.3) 30 -day J 1(2.80-3.89) 3.89 (3.31-4.54) 4.43 (3.77-5.17) 5.30 (4.50-6.20) 6.02 (5.08-7.07) 7.01 (5.72-8.45) 7.76 (6.20-9.49) 8.51 (6.59-10.6) 9.26 (6.90-11.9) l 10.2L (7.36-13.5) 11.0 (7.72-14.8) 45 -day 4.59 (3.93-5.31) 5.24 (4.49-6.07) 6.28_II 7.13 (5.36-7.29) (6.05-8.31) 8.26 9.12 (7.33-11.0) 9.96 (7.7 5-12.3) 10.8 (8.08-13.7) I 11.9 (8.56-15.5) 12.6 (8.93-16.8) 60 -day 5.15 (4.44-5.93) 5.92 (5.09-6.82) 7.13 (6.11-8.23) 8.10 (6.91-9.40) 9.40 (7.74-11.1) 10.4 (8.36-12.5) 11.3 (8.82-13_9) 12.2 (9.18-15.4) 13.3 (9.69-17.3) 14.2 (10.1-18.7) 1 Precipitation Numbers (for a given bounds are Please refer in frequency (PF) parenthesis are duration and average not checked against to NOAA Atlas 14 estimates PF estimates recurrence probable document in this at lower interval) maximum for more table are based on frequency and upper bounds of will be greater than precipitation (PMP) information. analysis of partial the 90% confidence interval. the upper bound (or less estimates and may be duration The than higher than series (PDS). probability that precipitation the lower bound) is 5%. currently valid PMP values. Estimates frequency estimates at upper Back to Top PF graphical https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?Iat=40.0013&Ion=-104.9041 &data=depth&units=english&series=pds 1/4 2/5/2020 Precipitation Frequency Data Server Attachment E L 1 a -a C O a a L 0. PDS-based depth -duration -frequency (DDF) curves Latitude: 40.0013°, Longitude: -104.9041° T I I T I I I T I I I T Ii Cc • Average recurrence interval (years) NOAA Atlas 14, Volume 8, Version 2 • • L r N r-1 Duration • • • T T T . -. >t >. RI 10"0 MI RI t T I >1 >1 >01 ro eo R M at' ei Created (GMT): Wed Feb 5 17:55:08 2020 Back to Top Maps & aerials Small scale terrain Average recurrence interval (years) 1 2 5 10 25 50 100 200 500 1000 Duration BASS 5 -mm — 2 -day 10 -mm 3 -day 15-mtn 4 -day 30 -man — 1 -clay 60 -man — 10 -day 2 -hr — 20 -day 3fir — 30 -day 6 -fir 45 -day 12fir - 60 -day 24 -Or https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?Iat=40.0013&Ion=-104.9041 &data=depth&units=english&series=pds 2/4 2/5/2020 Precipitation Frequency Data Server Attachment E 167th Ave i i E 167th `'ti - a O 0.4km I 0.2mi Reservoir Not afittxklaid Airport rue fie Muni cipal ►irpor t l el A t Large scale terrain v LVIIV 7 bf { 6km I I Ave Baseline Rd 4rni I t i - Large scale map 851 tone rick Dacono Erie L atay ette Louisville sue` %Superior BroomI el a 10km horn to I i 6mi t cc Large scale aerial https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?Iat=40.0013&Ion=-104.9041 &data=depth&units=erglish&series=pds 3/4 2/5/2020 Precipitation Frequency Data Server Attachment E Back to Top US Department of Commerce National Oceanic and Atmospheric Administration National Weather Service National Water Center 1325 East West Highway Silver Spring. MD 20910 Questions?: HDSC.Questions@noaa.gov Disclaimer https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=40.0013&Ion=-104.9041 &data=depth&units=english&series=pds 4/4 Attachment F Table 6-3. Recommended percentage imperviousness values Land Use or Surface Characteristics Percentage Imperviousness (0Aa) Business: Downtown Areas 95 Suburban Areas 75 Residential lots (lot area only): Single-family 2 5 acres or larger 12 0 75 — 2 5 acres 20 025-075 acres 30 0 25 acres or less 45 Apartments 75 Industrial: Light areas 80 Heavy areas 90 Parks, cemeteries 10 Playgrounds 25 Schools 55 Railroad yard areas 50 Undeveloped Areas: Historic flow analysis 2 Greenbelts, agricultural 2 Off -site flow analysis (when land use not defined) 45 Streets. Paved 100 Gravel (packed) 40 Drive and walks 90 Roofs 9i0 Lawns, sandy soil 2 Lawns, clayey soil 2 6-8 Urban Drainage and Flood Control District Urban Storm Drainage Criteria Manual Volume 1 August 2018 Attachment F DRAINAGE CRITERIA MANUAL (V 1) Table RO-5— Runoff Coefficients, C RUNOFF Percentage Imperviousness Type C and D NRCS Hydrologic Soil Groups 2-yr 5-yr 10-yr 25-yr 50-yr 100-yr 0% 004 015 025 037 044 050 5% 008 018 028 I 039 046 052 10% 011 021 030 I 041 047 053 15% 014 024 032 043 049 054 20% 017 026 034 i 044 050 055 25% 0 20 0 28 0 36 ' 0 46 0 51 0 56 30% 022 030 038 047 052 057 35% 025 033 040 I 048 053 057 40% 028 035 042 I 050 054 058 45% 031 037 044 ' 051 055 059 50% 0 34 0 40 0 46 1 0 53 0 57 0 60 55% 0 37 0 43 0 48 ' 0 55 0 58 0 62 60% 041 046 051 057 060 063 65% 045 049 054 059 062 065 70% 0 49 0 53 0 57 10 62 0 65 0 68 75% 0 54 0 58 0 62 10 66 0 68 0 71 80% 0 60 0 63 0 66 10 70 0 72 0 74 85% 066 068 071 075 077 079 90% 0 73 0 75 0 77 1 0 80 0 82 0 83 95% 0 80 0 82 0 84 ' 0 87 0 88 0 89 100% 089 090 092 1 094 095 096 TYPE B NRCS HYDROLOGIC SOILS GROUP 0% 002 008 015 1025 030 035 5% 004 010 019 1 028 033 038 10% 0 06 0 14 0 22 10 31 0 36 0 40 15% 008 017 025 033 038 042 20% 0 12 0 20 0 27 10 35 0 40 0 44 25% 015 022 030 ' 037 041 046 30% 0 18 0 25 0 32 10 39 0 43 0 47 35% 020 027 034 1 041 044 048 40% 0 23 0 30 0 36 1 0 42 0 46 0 50 45% 026 032 038 1044 048 051 50% 029 035 040 ! 046 049 052 55% 0 33 0 38 0 43 , 0 48 0 51 0 54 60% 037 041 046 1051 054 056 65% 0 41 0 45 0 49 0 54 0 57 0 59 70% 0 45 0 49 0 53 ' 0 58 0 60 0 62 75% 0 51 0 54 0 58 10 62 0 64 0 66 80% 0 57 0 59 0 63 ' 0 66 0 68 0 70 85% 0 63 0 66 0 69 10 72 0 73 0 75 90% 071 073 075 1078 080 081 95% 0 79 0 81 0 83 0 85 0 87 0 88 100% 0 89 0 90 0 92 ' 0 94 0 95 0 96 2007-01 Urban Drainage and Flood Control Distnct RO-11 Attachment G Composite Impervious Calculations PS 2 Site April 27 2020 Area (square feet) Type Unpaved Road Paved Road Gravel Roof Undeveloped Total Area square feet Total Area acres Composite %Impervious %Impervious 40 100 40 90 2 Existing B 10 0 0 0 0 180566 180566 4 15 2 Existing OS 6280 7300 0 0 66799 80379 1 85 13 9 Proposed B 1 0 797 405 0 36198 37400 0 86 4 5 Proposed B-2 0 12721 2045 21307 10181 46254 1 06 71 2 Proposed B 3 0 17289 5958 9449 33679 66375 1 52 43 5 Proposed B-4 0 4437 1777 93 8640 14947 0 34 36 2 Proposed Total 0 35244 10185 30849 88698 164976 3 79 41 7 Proposed OS 4942 7300 0 0 49532 61774 1 42 16 6 Basins Tributary To Pond Proposed B 2 Proposed B 3 0 0 12721 17289 2045 5958 21307 9449 10181 33679 46254 66375 1 06 1 52 2 59 712 43 5 54 8 Runoff Coefficients Soil Group C % of Total Impervious Area Historic Existing B 10 Existing OS Proposed B 1 Proposed B 2 Proposed B 3 Proposed B-4 Proposed OS Undeveloped 2% Impervious 2 yr Syr SOyr 100 yr 100% 100% 83% 96 8% 22% 51% 58% 80% 006 016 026 051 Unpaved Road 40% Impervious 2 yr 5yr 5yr 100 yr 0% 0% 8% 0 0% 0% 0% 0% 8% 028 035 042 058 Gravel 40% Impervious 2 yr Syr 5yr 100 yr 0% 0% 0% 1 1% 4% 9% 12% 0% 028 035 042 058 Roof 90% Impervious 2 yr Syr Syr 100 yr 0% 0% 0% 0 0% 46% 14% 1% 0% 073 075 077 083 Paved Road 100% Impervious 2 yr Syr Syr 100 yr 0% 0% 9% 2 1% 28% 26% 30% 12% 089 09 092 096 Compostte Runoff Coefficient 2 year 0.06 0 06 0 15 0 08 0 61 0 39 0 34 0 18 5 year 0 16 0 16 0 24 0 18 064 0 45 0 41 0 26 10 year 026 026 033 028 068 052 048 035 100 year 051 051 056 052 078 068 065 057 Attachment G Area -Weighting for Runoff Coefficient Calculation Project Title: Catchment ID: TWP - PS2 Historic - 10-yr Pond Illustration Instructions: For each catchment subarea, enter values for A and C. LE GEND : Flow Direction 4 CatClieat B nun dart' Subarea Area Runoff Product ID acres Coeff. A C* CA input input input output Historic 2.60 0.26 0.68 sum: 2.60 Sum: 0.68 Area -Weighted Runoff Coefficient (sum CA/sum A) = 0.26 *See sheet "Design Info" for inperviousness-based runoff coefficient values. 2020.04.27 PS2 Rational Existing. Weighted C H Pond 4/28/2020. 1:53 AM Attachment G Area -Weighting for Runoff Coefficient Calculation Project Title: Catchment ID: TWP - PS2 Historic - 10-yr Illustration Instructions: For each catchment subarea. enter values for A and C. LEGEND: Flow Direction 4 Catcinm eut Boundary Subarea Area Runoff Product ID acres Coeff. A C* CA input input input output Historic 4.15 0.26 1.08 sum: 4.15 sum: 1.08 Area -Weighted Runoff Coefficient (sum CA/sum A) = 0.26 *See sheet "Design Info" for inperviousness-based runoff coefficient values. 2020.04.27 PS2 Rational Existing. Weighted C H All 4/28/2020, 1:53 AM Attachment G Area -Weighting for Runoff Coefficient Calculation Project Title: Catchment ID: TWP - PS2 Existing B-10 - 100-yr Illustration LEGEND: Flow Direction C at Chm tnt Boundary Instructions: For each catchment subarea, enter values for A and C. Subarea Area Runoff Product ID acres Coeff. A C* CA input input input output Ex B10 Undev 4.15 0.51 2.12 sum: 4.15 Sum 2.12 Area -Weighted Runoff Coefficient (sum CA/sum A) = 0.51 *See sheet "Design Info" for inperviousness-based runoff coefficient values. 2020.04.27 PS2 Rational Existing, Weighted C Exst B10 4/28/2020, 1:53 AM Attachment G Area -Weighting for Runoff Coefficient Calculation Project Title: Catchment ID: TWP - PS2 Existing OS - 100-yr Illustration LEGEND : Flow Direction 4 Carom ent B crtindary Instructions: For each catchment subarea, enter values for A and C. Subarea Area Runoff Product ID acres Coeff. A C* CA input input input output Ex OS Undev 1.53 0.51 0.78 Ex OS Unp Rd 0.14 0.58 0.08 Ex OS Pvd Rd 0.17 0.96 0.16 I sum: 1.85 I Sum: 1.03 Area -Weighted Runoff Coefficient (sum CA/sum A) = 0.56 *See sheet "Design Info" for inperviousness-based runoff coefficient values. 2020.04.27 PS2 Rational Existing. Weighted C Exst OS 4/28/2020, 1:53 AM Attachment G CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment ID: TWP - PS2 Historic - 10-yr I. Catchment Hydrologic Data Catchment ID = Area = Percent Imperviousness = NRCS Soil Type = Historic 4.15 2.00 C Acres A. B. C. or D II. Rainfall Information I (inch/hr) = C1 * P1 /(C2 + Td)^C3 Design Storm Return Period. Tr = C1 = C2= C3= P1= 10 28.50 10.00 0.786 1.38 years (input return period for design storm) (input the value of C1) (input the value of C2) (input the value of C3) inches (input one -hr precipitation --see Sheet "Design Info") III. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient, C = Overide Runoff Coefficient. C = 5-yr. Runoff Coefficient. C-5 = Overide 5-yr. Runoff Coefficient. C = 0.26 0.06 (enter an overide C value if desired. or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) Illustration Reach 2 otre rland Reach 1 flow LEGEND Beginning Flow Direction I' Catchment Boundary NRCS Land Type Conveyance Heavy Meadow 2.5 Tillage/ Field 5 Short Pasture/ Lawns 7 Nearly Bare Ground 10 Grassed Swales/ Waterways 15 Paved Areas & Shallow Paved Swales (Sheet Flow) 20 Calculations. Reach ID Overland 1 Slope S ft/ft input 2 3 4 0.0560 0.0760 Length L ft input 500 105 5 Sum 605 IV. Peak Runoff Prediction Rainfall Intensity at Computed Tc. I = Rainfall Intensity at Regional Tc. I = Rainfall Intensity at User -Defined Tc. I = 2.40 inch/hr inch/hr 3.30 2.40 inch/hr 5-yr Runoff Coeff C-5 output 0.06 NRCS Convey- ance input N/A Flow Velocity V fps output 0.35 5.00 1.38 Computed Tc = Regional Tc = User -Entered Tc = Peak Flowrate. Op = Peak Flowrate, Qp = Peak Flowrate. Qp = Flow Time Tf minutes output 23.78 1.27 25.05 13.36 25.05 2.59 3.57 2.59 cf s cf s cf s 2020.04.27 PS2 Rational Existing. Tc and PeakQ H 4/28/2020. 1 53 AM Attachment G CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment ID: TWP - PS2 Historic - 10-yr Pond I. Catchment Hydrologic Data Catchment ID = Historic Area = 2.60 Acres Percent Imperviousness = 2.00 NRCS Soil Type = C A, B. C. or D II. Rainfall Information I (inch/hr) = C1 * P1 /(C2 + Td)AC3 Design Storm Return Period. Tr = 10 years (input return period for design storm) C1 = 28.50 (input the value of C1) C2= 10.00 (input the value of C2) C3= 0.786 (input the value of C3) P1= 1.38 inches (input one -hr precipitation --see Sheet "Design Info") III. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient, C = 0.07 Overide Runoff Coefficient, C = 0.26 (enter an overide C value if desired. or leave blank to accept calculated C.) 5-yr. Runoff Coefficient. C-5 = 0.00 Overide 5-yr. Runoff Coefficient, C = 0.06 (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) Illustration • Reach 2 .- Reach I overland flow LEGEND Beginning Flow D irec do n 4 Cab hnient Boundary NRCS Land Type Conveyance Heavy Meadow 2.5 Tillage/ Field 5 Short Pasture/ Lawns 7 Nearly Bare Ground 10 Grassed Swales/ Waterways 15 Paved Areas & S callow Paved Swales (Sheet Flow) 20 Calculations: Reach ID Overland 1 2 3 4 5 Slope S ft.ft input 0.0670 Length L ft input Sum 465 IV. Peak Runoff Prediction Rainfall Intensity at Computed Tc. I = Rainfall Intensity at Regional Tc. I = Rainfall Intensity at User -Defined Tc, I = 2.61 inch/hr 3.39 inch/hr 2.61 inch/hr 5-yr Runoff Coeff C-5 output NRCS Convey- ance input Flow elocity V fps output 0.06 N/A 0.36 CompL ted Tc Regional Tc User -Entered Tc Peak Flowrate. Qp = Peak Flowrate. Qp = Peak Flowrate. Qp = Flow Time Tf minutes output 21.61 1.76 cfs 2.29 cfs 1.76 cfs 2020.04.27 PS2 Rational Existing, Tc and PeakQ H Pond 4/28/2020, 1:53 AM Attachment G CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment ID: TWP - PS2 Existing - B-10 100-yr I. Catchment Hydrologic Data Catchment ID = Area = Percent Imperviousness = NRCS Soil Type = Existing 4.15 2.00 C II. Rainfall Information Design Storm Return Period. Tr = 01= C2= C3= P1= Acres 0/0 A. B. C. or D I (inch/hr) = C1 * P1 /(C2 + Td)^C3 100 28.50 10.00 0.786 2.60 years (input return period for design storm) (input the value of C1) (input the value of C2) (input the value of C3) inches (input one -hr precipitation --see Sheet "Design Info") III. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient, C = Overide Runoff Coefficient, C = 5-yr. Runoff Coefficient. C-5 = Overide 5-yr. Runoff Coefficient, C = 0.07 0.51 0.00 0.16 (enter an overide C value if desired. or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) Illustration LEGEND �? B relining Flow Direction f Catchment Boundary NRCS Land Type Conveyance Heavy Meadow 2.5 Tillage/ Field 5 Short Pasture/ Lawns 7 Nearly Bare Ground 10 Grassed Swales/ Waterways 15 Paved Areas & Shallow Paved Swales (Sheet Flow) 20 Calculations Reach ID Overland 1 2 3 4 5 Slope S ft/ft input 0.0560 0.0760 Length L ft input 500 105 Sum 605 IV. Peak Runoff Prediction Rainfall Intensity at Computed Tc. I = Rainfall Intensity at Regional Tc, I = Rainfall Intensity at User -Defined Tc. I = 4.77 inch/hr 6.23 inch/hr 6.23 inch/hr 5-yr Runoff Coeff C-5 output 0.16 NRCS Convey- ance input N/A 5.00 Flow Velocity V fps output 0.39 1.38 Computed Tc = Regional Tc = User -Entered Tc = Peak Flowrate, Qp = Peak Flowrate, Qp = Peak Flowrate, Qp = Flow Time Tf minutes output 21.49 1.27 22.76 13.36 13.36 10.10 13.18 13.18 cfs cfs cfs 2020.04.27 PS2 Rational Existing. Tc and PeakQ Exst B10 4/28/2020, 1 53 AM Attachment G CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment ID: TWP - PS2 Existing - OS 100-yr I. Catchment Hydrologic Data Catchment ID = Existing Area = Percent Imperviousness = NRCS Soil Type = 1.85 Acres 13.90 13/0 C A. B. C. or D II. Rainfall Information I (inch/hr) = C1 * P1 /(C2 + Td)^C3 Design Storm Return Period. Tr = C1 = C2= C3= P1= 100 years 28.50 10.00 0.786 2.60 inches (input return period for design storm) (input the value of C1) (input the value of C2) (input the value of C3) (input one -hr precipitation --see Sheet "Design Info") III. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient. C = Overide Runoff Coefficient. C = 5-yr. Runoff Coefficient. C-5 = Overide 5-yr. Runoff Coefficient, C = 0.07 Reach :3 0.56 (enter an overide C value if desiredor leave blank to accept calculated C.) 0.00 0.24 (enter an overide C-5 value if desired. or leave blank to accept calculated C-5.) Illustration Reach 2 overland Reach 1 flow LEGEND 0 $ _iQg Flow D irec do n t C atc tune nt Boundary NRCS Land Type Conveyance Heavy Meadow 2.5 Tillage, Field 5 Short Pasture/ Lawns 7 Nearly Bare Ground 10 Grassed Swales/ Waterways 15 Paved Areas & Shallow Paved Swales (Sheet Flow) 20 Calculations: Reach ID Overland 1 Slope S ft/ft input Length L ft input 0.0820 0.0300 61 1,012 2 3 4 5 Sum 1,073 IV. Peak Runoff Prediction Rainfall Intensity at Computed Tc. I = Rainfall Intensity at Regional Tc, I = Rainfall Intensity at User -Defined Tc. I = 6.40 inch/hr 5.73 inch/hr 6.40 inch/hr 5-yr Runoff Coeff C-5 output 0.24 NRCS Convey- ance input N/A 15.00 Flow Velocity V fps output 2.60 Computed Tc = Regional Tc = User -Entered Tc = Peak Flowrate. Op = Peak Flowrate. Qp = Peak Flowrate. Op = Flow Time Tf minutes output 6.49 12.55 15.96 12.55 6.63 cfs 5.94 cfs 6.63 cfs 2020.04.27 PS2 Rational Existing. Tc and Peak() Exst OS 4/28/2020, 1:53 AM Attachment G Area -Weighting for Runoff Coefficient Calculation Project Title: Catchment ID: TWP - PS2 Proposed B-1 Illustration LEGEND: Flow Direction 4 Cat cam eta B nun daz y Instructions. For each catchment subarea, enter values for A and C. Subarea Area I Runoff Product ID acres Coeff. A C* CA input input input output B-1 Undev 0.83 0.51 0.42 B-1 Gray 0.01 0.58 0.01 B-1 Pvd Rd 0.02 0.96 0.02 I sum: 0.86 Sum: 0.45 Area -Weighted Runoff Coefficient (sum CA/sum A) _ 0.52 *See sheet "Design Info" for inperviousness-based runoff coefficient values. 2020.04.27 PS2 Rational Proposed. Weighted C P B1 4/28/2020. 1:57 AM Attachment G Area -Weighting for Runoff Coefficient Calculation Project Title: Catchment ID: TWP - PS2 Proposed B-2 Illustration LEGEND: Flow Direction 4 Catctxm en B o radar - Instructions: For each catchment subarea, enter values for A and C. Subarea Area Runoff Product ID acres Coeff. A C* CA input input input output B-2 Undev 0.23 0.51 I 0.12 B-2 Gray 0.05 0.58 0.03 B-2 Roof 0.49 0.83 0.41 B-2 Pvd Rd 0.29 i 0.96 0.28 sum: 1.06 Sum: 0.83 Area -Weighted Runoff Coefficient (sum CA/sum A) = 0.78 *See sheet "Design Info" for inperviousness-based runoff coefficient values. 2020.04.27 PS2 Rational Proposed. Weighted C P B2 4/28/2020, 1:57 AM Attachment G Area -Weighting for Runoff Coefficient Calculation Project Title: Catchment ID: TWP - PS2 Proposed B-3 Illustration LEGEND: Flow Direction 4 C at chm eat B otsndar, T Instructions For each catchment subarea, enter values for A and C. Subarea Area Runoff Product ID acres Coeff. A C* CA input input input output B-3 Undev 0.77 0.51 0.39 B-3 Gray 0.14 0.58 0.08 B-3 Roof 0.22 0.83 0.18 B-3 Pvd Rd 0.40 0.96 0.38 sum: 1.52 sum: 1.03 Area -Weighted Runoff Coefficient (sum CA/sum A) = 0.68 *See sheet "Design Info" for inperviousness-based runoff coefficient values. 2020.04.27 PS2 Rational Proposed. Weighted C P B3 4/28/2020. 1:57 AM Attachment G Area -Weighting for Runoff Coefficient Calculation Project Title: Catchment ID: TWP - PS2 Proposed B-4 Illustration LEGEND : 'low Direction 4 Cat chin air B (military Instructions: For each catchment subarea. enter values for A and C. Subarea Area Runoff Product ID acres Coeff. A C* CA input input input output B-4 Undev 0.20 0.51 0.10 B-4 Gray 0.04 0.58 0.02 B-4 Roof 0.00 0.83 0.00 B-4 Pvd Rd 0.10 0.96 0.10 sum:. 0.34 Sum: 0.22 Area -Weighted Runoff Coefficient (sum CA/sum A) = 0.65 *See sheet "Design Info" for inperviousness-based runoff coefficient values. 2020.04.27 PS2 Rational Proposed. Weighted C P B4 4/28/2020, 1:57 AM Attachment G Area -Weighting for Runoff Coefficient Calculation Project Title: Catchment ID: TWP - PS2 Proposed OS Illustration rEGEvD : Flow Direction C at clim eat B ottarlaw Instructions: For each catchment subarea, enter values for A and C. Subarea Area Runoff Product ID acres Coeff. A C* CA input input input output B-4 Undev 1.14 0.51 0.58 B-4 Unp Rd 0.11 0.58 0.07 B-4 Pvd Rd 0.17 0.96 0.16 sum: 1.42 sum: 0.81 Area -Weighted Runoff Coefficient (sum CA/sum A) = 0.57 *See sheet "Design Info" for inperviousness-based runoff coefficient values. 2020.04.27 PS2 Rational Proposed, Weighted C P OS 4/28/2020. 1:57 AM Attachment G CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment ID: TWP - PS2 Proposed B-1 - 100-yr I. Catchment Hydrologic Data Catchment ID = Proposed Area = Percent Imperviousness = NRCS Soil Type = 0.86 Acres 4.50 CA,B.C or II. Rainfall Information I (inch/hr) = C1 * P1 /(C2 + Td)^C3 Design Storm Return Period. Tr = 100 years (input return period for design storm) C1 = 28.50 (input the value of C1) C2= 10.00 (input the value of C2) C3= 0.786 (input the value of C3) P1= 2.60 inches (input one -hr precipitation --see Sheet "Design Info") III. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient, C = Overide Runoff Coefficient. C = 5-yr. Runoff Coefficient. C-5 = Overide 5-yr. Runoff Coefficient, C = 0.52 (enter an overide C value if desired. or leave blank to accept calculated C.) 0.18 (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) Illustration Reach 2. - Reach 1 overland flow LEGEND , (ID Beginnin.., ` � a Flow D irec do 4 C atc hnie nt Boundary NRCS Land Type Conveyance Heavy Meadow 2.5 Tillage/ Field 5 Short Pasture/ Lawns Nearly Bare Ground 10 Grassed Swales/ Waterways 15 Paved Areas & Shallow Paved Swales (Sheet Flow) 20 Calculations Reach ID Overland Slope S ft/ft input Length L ft input 0.0700 230 1 2 3 4 Sum IV. Peak Runoff Prediction Rainfall Intensity at Computed To, I = Rainfall Intensity at Regional Tc, I = Rainfall Intensity at User -Defined Tc, I = 230 6.25 inch/hr 6.70 inch/hr 6.70 inch/hr 5-yr Runoff Coeff C-5 output 0.18 Computed Tc = Regional Tc = User -Entered Tc = Peak Flowrate. Qp = Peak Flowrate. Qp = Peak Flowrate. Qp = 2.79 cfs 3.00 cfs 3.00 cfs 2020.04.27 PS2 Rational Proposed. Tc and PeakQ P B1 4/28/2020, 1:57 AM Attachment G CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment ID: TWP - PS2 Proposed B-2 - 100-yr I. Catchment Hydrologic Data Catchment ID = Area = Percent Imperviousness = NRCS Soil Type = Proposed 1.06 71.20 C II. Rainfall Information Design Storm Return Period. Tr = C1 = C2= C3= P1= Acres 0/0 A, B, C. or D I (inch/hr) = C1 * P1 /(C2 + Td)^C3 100 28.50 10.00 0.786 2.60 years inches (input return period for design storm) (input the value of C1) (input the value of C2) (input the value of C3) (input one -hr precipitation --see Sheet "Design Info") III. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient, C = Overide Runoff Coefficient. C = 5-yr. Runoff Coefficient. C-5 = Overide 5-yr. Runoff Coefficient, C = 0.78 (enter an overide C value if desired. or leave blank to accept calculated C.) 0.64 (enter an overide C-5 value if desires, or leave blank to accept calculated C-5.) Reach 3 Illustration Reach 2 -bi- overland Reach 1 flow LEGEND Beginning Flow Direction C ate hnle nt Boundary NRCS Land Type Conveyance Heavy Meadow 2.5 Tillage/ Field 5 Short Pasture/ Lawns Nearly Bare Ground 10 Grassed Swales/ Waterways 15 Paved Areas & Shallow Paved Swales (Sheet Flow) 20 Calculations. Reach ID Overland 1 Slope S ft/ft input 2 3 4 5 0.0280 0.0200 0.0420 Length L ft input 123 300 120 Sum 543 IV. Peak Runoff Prediction Rainfall Intensity at Computed Tc. I = Rainfall Intensity at Regional Tc, I = Rainfall Intensity at User -Defined Tc. I = 7.20 inch/hr 6.30 inch/hr 7.20 inch/hr 5-yr Runoff Coeff C-5 output 0.64 NRCS Convey- ance input N/A Flow Velocity V fps output 0.31 15.00 2.12 20.00 4.10 Computed Tc = Regional Tc = User -Entered Tc = Peak Flowrate. Qp = Peak Flowrate. Qp = Peak Flowrate. Qp = Flow Time Tf minutes output 6.56 2.36 0.49 9.40 13.02 9.40 5.96 5.21 5.96 cfs cfs cfs 2020.04.27 PS2 Rational Proposed. Tc and PeakQ P B2 4/28/2020. 1:57 AM Attachment G CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment ID: TWP - PS2 Proposed B-3 - 100-yr I. Catchment Hydrologic Data Catchment ID = Proposed Area = Percent Imperviousness = NRCS Soil Type = 1.52 Acres 43.50 CA.B.C.orD II. Rainfall Information I (inch/hr) = C1 it P1 /(C2 + Td)^C3 Design Storm Return Period. Tr = 100 years C1 = 28.50 C2= 10.00 C3= 0.786 P1= 2.60 inches (input return period for design storm) (input the value of C1) (input the value of C2) (input the value of C3) (input one -hr precipitation --see Sheet "Design Info") III. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient, C = Overide Runoff Coefficient. C = 5-yr. Runoff Coefficient. C-5 = Overide 5-yr. Runoff Coefficient. C = 0.68 (enter an overide C value if desired. or leave blank to accept calculated C.) 0.45 (enter an overide C-5 value if desired. or leave blank to accept calculated C-5.) Illustration LEGEND 0 D glimiag Flow Direr -tio 4 Cate hrent Boundary NRCS Land Type Conveyance Heavy Meadow 2.5 Tillage/ Field 5 Short Pasture/ Lawns 7 Nearly Bare Ground 10 Grassed Swales/ Waterways 15 Paved Areas & S callow Paved Swales (Sheet Flow) 20 Calculations Reach ID Overland 1 2 3 4 5 Slope S ftft input 0.0350 0.0290 Length L ft input 143 705 5-yr Runoff Coeff C-5 output NRCS Convey- ance input Flow Velocity V fps output 0.45 N/A 0.26 Flow Time Tf minutes output 9.28 Sum 848 IV. Peak Runoff Prediction Rainfall Intensity at Computed Tc. I = Rainfall Intensity at Regional Tc, I = Rainfall Intensity at User -Defined Tc, I = 6.12 inch/hr 5.96 inch/hr 6.12 inch/hr 15.00 2.55 4.60 CompL ted Tc = Regional Tc = User -Entered Tc = Peak Flowrate. Qp = Peak Flowrate. Qp = Peak Flowrate. Qp = 13.88 14.71 13.88 6.32 cfs 6.16 cfs 6.32 cfs 2020.04.27 PS2 Rational Proposed. Tc and PeakQ P B3 4/28/2020. 1:57 AM Attachment G CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment ID: TWP - PS2 Proposed B-4 - 100-yr I. Catchment Hydrolog c Data Catchment ID = Area = Percent Imperviousness = NRCS Soil Type = Proposed 0.34 36.20 C Acres A, B.C.orD II. Rainfall Information I (inch/hr) = C1 x P1 /(C2 + Td)^C3 Design Storm Return Period. Tr = 01 = C2= C3= P1= 100 28.50 10.00 0.786 2.60 years (input return period for design storm) (input the value of C1) (input the value of C2) (input the value of C3) inches (input one -hr precipitation --see Sheet "Design Info") III. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient, C = Overide Runoff Coefficient, C = 5-yr. Runoff Coefficient. C-5 = Overide 5-yr. Runoff Coefficient. C = 0.65 0.41 (enter an overide C value if desired. or leave blank to accept calculated C.) (enter an overide C-5 value if desired, or leave blank to accept calculated C-5.) Illustration LEGEND S Beginning Flow Directio n 4 Catchment Boundary NRCS Land Type Conveyance Heavy Meadow 2.5 Tillage,' Field 5 Short Pasture Lawns 7 Nearly Bare Ground 10 Grassed Swales Waterways 15 Paved Areas & Shallow Paved Swales (Sheet Flow) 20 Calculations. Reach ID Overland 1 2 3 4 5 Slope S ft/ft input 0.0820 0.1410 Length L ft input 122 85 Sum 207 IV. Peak Runoff Prediction Rainfall Intensity at Computed Tc, I = Rainfall Intensity at Regional Tc, I = Rainfall Intensity at User -Defined Tc, I = 7.95 inch/hr 6.73 inch/hr 7.95 inch/hr 5-yr Runoff Coeff C-5 output 0.41 NRCS Convey- ance input N/A 15.00 Flow Velocity V fps output 0.30 5.63 7.12 Computed Tc = Regional Tc = User -Entered Tc = Peak Flowrate. Qp = Peak Flowrate. Qp = Peak Flowrate. Qp = Flow Time Tf minutes output 6.87 0.25 11.15 7.12 1.76 1.49 1.76 cfs cfs cfs 2020.04.27 PS2 Rational Proposed, Tc and PeakQ P B4 4/28/2020. 1:57 AM Attachment G CALCULATION OF A PEAK RUNOFF USING RATIONAL METHOD Project Title: Catchment ID: TWP - PS2 Proposed OS - 100-yr I. Catchment Hydrologic Data Catchment ID = Proposed Area = Percent Imperviousness = NRCS Soil Type = 1.42 Acres 16.60 C A, B, C. or D II. Rainfall Information Design Storm Return Period. Tr = C1 = C2= C3= P1= I (inch/hr) = C1 * P1 /(C2 + Td)^C3 100 years 28.50 10.00 0.786 2.60 inches (input return period for design storm) (input the value of C1) (input the value of C2) (input the value of C3) (input one -hr precipitation --see Sheet "Design Info") III. Analysis of Flow Time (Time of Concentration) for a Catchment Runoff Coefficient. C = Overide Runoff Coefficient. C = 5-yr. Runoff Coefficient. C-5 = Overide 5-yr. Runoff Coefficient, C = 0.57 (enter an overide C value if desired. or leave blank to accept calculated C.) 0.26 (enter an overide C-5 value if desired. or leave blank to accept calculated C-5.) Illustration Reach 2 1-' r Reach 1 overland flaw LEGEND 0 Beginning Flow Direction 4 Catchment Boundary NRCS Land Type Conveyance Heavy Meadow 2.5 Tillage/ Field 5 Short Pasture/ Lawns 7 Nearly Bare Ground 10 Grassed Swales/ Waterways 15 Paved Areas & Shallow Paved Swales (Sheet Flow) 20 Calculations Reach ID Overland Slope S ft/ft input Length L ft input 5-yr Runoff Coeff C-5 output NRCS Convey- ance input Flow Velocity V fps output Flow Time Tf minutes output 1 2 3 0.0820 0.0270 61 0.26 889 4 5 Sum IV. Peak Runoff Prediction Rainfall Intensity at Computed Tc. I = Rainfall Intensity at Regional Tc, I = Rainfall Intensity at User -Defined Tc, I = 950 6.54 inch/hr 5.85 inch/hr 6.54 inch/hr N/A 15.00 0.17 5.92 2.46 6.01 Computed Tc = Regional Tc = User -Entered Tc = Peak Flowrate. Qp = Peak Flowrate. Qp = Peak Flowrate. Qp = 44.93 15.28 11.93 5.30 cfs 4.74 cfs 5.30 cfs 2020.04.27 PS2 Rational Proposed, Tc and PeakQ P OS 4/28/2020. 1 57 AM Attachment H DETENTION VOLUME BY THE MODIFIED FAA METHOD Project: TWP PS2 Basin ID: PS2 B-2 and B-3 (For catchments less than 160 acres only. For larger catchments, use hydrograph routing method) (NOTE: for catchments larger than 90 acres, CUHP hydrograph and routing are recommended) Determination of MINOR Detention Volume Using Modified FAA Method Determination of MAJOR Detention Volume Using Modified FAA Method Design Information (Input): Design Information (Input): Catchment Drainage Imperviousness I, = 54.80 percent Catchment Drainage Imperviousness I, = 54.80 percent Catchment Drainage Area A = 2.590 acres Catchment Drainage Area A = 2.590 acres Predevelopment NRCS Sod Group Type = C A B. C. or D Predevelopment NRCS Sod Group Type = C A. B, C. or D Return Period for Detention Control T = 100 years (2 5 10 25, 50. or 100) Return Penod for Detention Control T = 100 years (2. 5. 10. 25. 50. or 100) Time of Concentration of Watershed Tc = 14 minutes Time of Concentration of Watershed Tc = 14 minutes Allowable Unit Release Rate q = 0.68 cfs/acre Allowable Unit Release Rate q = 0.68 cfs/acre One -hour Precipitation P, = 2.60 inches One -hour Precipitation P, = 2.60 inches Design Rainfall IDF Formula i = C,' P,/(C2+Tc)"C3 Design Rainfall IDE Formula i = C,' P,/(C2+TJ"C3 Coefficient One C, = 28.50 Coefficient One C, = 28.50 Coefficient Two C2 = 10 Coefficient Two C2 = 10 Coefficient Three C3 = 0.789 Coefficient Three C1 = 0.789 Determination of Average Outflow from the Basin (Calculated): Determination of Average Outflow from the Basin (Calculated): Runoff Coefficient C = 0.62 Runoff Coefficient C = 0.62 Inflow Peak Runoff Op -in = 9.73 cfs Inflow Peak Runoff op -in = 9.73 cfs Allowable Peak Outflow Rate Qp-out = 1.76 cfs Allowable Peak Outflow Rate op -out = 1.76 cfs Mod. FAA Minor Storage Volume = 11 492 cubic feet Mod. FAA Major Storage Volume = 11.492 cubic feet Mod. FAA Minor Storage Volume = 0.264 acre -ft Mod. FM Major Storage Volume = 0.264 acre -ft 5 <- Enter Rainfal Duration Incremental Increase Value Here (e.g. 5 for 5 -Minutes) Rainfall Duration minutes (input) Rainfall Intensity inches / hr (output) Inflow Volume acre-feet (output) Adjustment Factor "m" (output) Average Outflow cfs (output) Outflow Volume acre-feet (output) Storage Volume acre-feet (output) Rainfall Duration minutes (input) Rainfall Intensity inches / hr (output) Inflow Volume acre-feet (output) Adjustment Factor "m" (output) Average Outflow cfs (output) Outflow Volume acre-feet (output) Storage Volume acre-feet (output) 0 0.00 0.000 0.00 0.00 0.1300 0.000 0 0.00 0.000 0.00 0.00 0.000 0.000 5 8.75 0.097 1.00 1.76 0.012 0.085 5 8.75 0.097 1.00 1.76 0.012 0.085 10 6.97 0.154 1.00 1.76 0.024 0.130 10 6.97 15 5.85 0.154 0.194 1.00 0.96 1.76 1.70 0.024 0.035 0.130 0.159 15 5.85 0.194 0.96 1.70 0.035 0.159 20 5.06 0.224 0.85 1.49 0.041 0.183 20 5.06 0.224 0.85 1.49 0.041 0.183 25 4.48 0.248 0.78 1.37 0.047 0.201 25 4.48 0.248 0.78 1.37 0.047 0.201 30 4.03 0.268 0.73 1.29 0.053 0.214 30 4.03 0.268 0.73 1.29 0.053 0.214 35 3.68 0.285 0.70 1.23 0.059 0.225 35 3.68 0.285 0.70 1.23 0.059 0.225 40 3.38 0.299 0.67 1.19 0.065 0.234 40 3.38 0.299 0.67 1.19 0.065 0.234 45 3.14 0.312 0.65 1.15 0.071 0.241 45 3.14 0.312 0.65 1.15 0.071 0.241 50 2.93 55 2.75 0.324 0.335 0.64 0.63 1.13 1.10 0.077 0.084 0.247 0.251 50 2.93 0.324 0.64 1.13 0.077 0.247 55 2.75 0.335 0.63 1.10 0.084 0.251 60 2.59 0.344 0.62 1.08 0.090 0.255 60 2.59 0.344 0.62 1.08 0.090 0.255 65 2.46 0.353 0.61 1.07 0.096 0.258 65 2.46 0.353 0.61 1.07 0.096 0.258 70 2.33 0.362 0.60 1.06 0.102 0.260 70 2.33 0.362 0.60 1.06 0.102 0.260 75 2.23 0.369 0.59 1.04 0.108 0.261 75 2.23 0.369 0.59 1.04 0.108 0.261 80 2.13 0.377 0.59 1.03 0.114 0.263 80 2.13 0.377 0.59 1.03 0.114 0.263 85 2.34 0.383 0.58 1.02 0.120 0.263 85 2.04 0.383 0.58 1.02 0.120 0.263 90 1.96 0.390 0.58 1.02 0.126 0.264 90 1.96 0.390 0.58 1.02 0.126 0.264 95 1.88 0.396 0.57 1.01 0.132 0.264 95 1.88 0.396 0.57 1.01 0.132 0.264 100 1.82 0.402 0,57 1.00 0.138 0.264 100 1.82 0.402 0.57 1.00 0.138 0.264 105 110 1.75 1.70 0.407 0.413 0.57 0.56 1.00 0.99 0.144 0.150 0.263 0.262 105 1.75 110 1.70 0.407 0.413 0.57 0.56 1.00 0.99 0.144 0.150 0.263 0.262 115 1.64 0.418 0.56 0.99 0.156 0.261 115 1.64 0.418 0.56 0.99 0.156 0.261 120 1.59 0.423 0.56 0.98 0.162 0.260 120 1.59 0.423 0.56 0.98 0.162 0.260 125 1.55 0.427 0.56 0.98 0.168 0.259 125 1.55 0.427 0.56 0.98 0.168 0.259 130 1.50 0.432 0.55 0.97 0.175 0.257 130 1.50 0.432 0.55 0.97 0.175 0.257 135 1.46 0.436 0.55 0.97 0.181 0.256 135 1.46 0.436 0.55 0.97 0.181 0.256 140 1.42 0.440 0.55 0.97 0.187 0.254 140 1.42 0.440 0.55 0.97 0.187 0.254 145 1.39 0.444 0.55 0.96 0.193 0.252 145 1.39 0.444 0.55 0.96 0.193 0.252 150 1.35 0.448 0.55 0.96 0.199 0.250 150 1.35 0.448 0.55 0.96 0.199 0.250 155 1.32 0.452 0.54 0.96 0.205 0.247 155 1.32 0.452 0.54 0.96 0.205 0.247 160 165 1.29 1.25 0.456 0.460 0.54 0.54 0.96 0.95 0.211 0.217 0.245 0.243 160 1.29 0.456 0.54 0.96 0.211 0.245 165 1.26 0.460 0.54 0.95 0.217 0.243 170 1.23 0.463 0.54 0.95 0.223 0.240 170 1.23 0.463 0.54 0.95 0.223 0.240 175 1.21 0.466 0.54 0.95 0.229 0.237 175 1.21 0.466 0.54 0.95 0.229 0.237 180 1.18 0.470 0.54 0.95 0.235 0.235 180 1.18 0.470 0.54 0.95 0.235 0.235 185 1.16 0.473 0.54 0.95 0.241 0.232 185 1.16 0.473 0.54 0.95 0.241 0.232 190 1.13 0.476 0.54 0.94 0.247 0.229 190 1.13 0.476 0.54 0.94 0.247 0.229 195 1.11 0.479 0.54 0.94 0.253 0.226 195 1.11 0.479 0.54 0.94 0.253 0.226 200 1.09 0.482 0.53 0.94 0.259 0.223 200 1.09 0.482 0.53 0.94 0.259 0.223 205 1.07 0.485 0.53 0.94 0.265 0.220 205 1.07 0.485 0.53 0.94 0.265 0.220 210 1.C5 0.488 0.53 0.94 0.272 0.217 210 1.05 0.488 0.53 0.94 0.272 0.217 215 1.C3 0.491 0.53 0.94 0.278 0.213 215 1.03 220 1.01 0.491 0.494 0.53 0.53 0.94 0.94 0.278 0.284 0.213 0.210 220 1.C1 0.494 0.53 0.94 0.284 0.210 225 1.00 0.497 0.53 0.93 0.290 0.207 225 1.00 0.497 0.53 0.93 0.290 0.207 230 0.98 0.499 0.53 0.93 0.296 0.203 230 0.98 0.499 0.53 0.93 0.296 0.203 235 0.97 0.502 0.53 0.93 0.302 0.200 235 0.97 0.502 0.53 0.93 0.302 0.200 240 0.95 0.504 0.53 0.93 0.308 0.196 240 0.95 0.504 0.53 0.93 0.308 0.196 245 0.94 0.507 0.53 0.93 0.314 0.193 245 0.94 0.507 0.53 0.93 0.314 0.193 250 0.92 0.509 0.53 0.93 0.320 0.189 250 0.92 0.509 0.53 0.93 0.320 0.189 255 0.91 0.512 0.53 0.93 0.326 0.186 255 0.91 0.512 0.53 0.93 0.326 0.186 260 0.89 0.514 0.53 0.93 0.332 0.182 260 0.89 0.514 0.53 0.93 0.332 0.182 265 0.88 0.517 0.53 0.93 0.338 0.178 265 0.88 0.517 0.53 0.93 0.338 0.178 270 0.87 0.519 0.53 0.93 0.344 0.175 270 0.87 275 0.86 0.519 0.521 0.53 0.53 0.93 0.93 0.344 0.350 0.175 0.171 275 0.86 0.521 0.53 0.93 0.350 0.171 280 0.85 0.523 0.52 0.92 0.356 0.167 280 0.85 0.523 0.52 0.92 0.356 0.167 285 0.83 0.526 0.52 0.92 0.363 0.163 285 0.83 0.526 0.52 0.92 0.363 0.163 290 0.82 0.528 0.52 0.92 0.369 0.159 290 0.82 0.528 0.52 0.92 0.369 0.159 295 0.81 0.530 0.52 0.92 0.375 0.155 295 0.81 0.530 0.52 0.92 0.375 0.155 300 0.80 0.532 0.52 0.92 0.381 0.151 300 0.80 0.532 0.52 0.92 0.381 0.151 Mod. FAA Minor Storage Volume (cubic ft.) = 11,492 Mod. FAA Major Storage Volume (cubic ft.) = Mod. FAA Minor Storage Volume (acre -ft.) = 0.2638 Mod. FAA Major Storage Volume (acre -ft.) = UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2.35, Released January 2015 11,492 0.2638 2020.04.28 PS2 Detention, Modified FAA 4/28/2020, 2 22 PM Attachment H DETENTION VOLUME BY THE MODIFIED FAA METHOD Project: TWP PS2 Basin ID: PS2 B-2 and B-3 K Inflow and Outflow Volumes vs. Rainfall Duration i • Volume (acre-feet) 0.6 0.5 0.4 0.3 0.2 0.1 0 0 • it • - •••••••••••••••••••••• sees ••• ••••• �i- • • 4 ••• •• •••• • 50 100 150 200 Duration (Minutes) Minor Storm Outflow Volume .0 —Minor Storm Inflow Volume —0—Major Storm Inflow Volume --..—Major Storm Outflow Volume 250E 300 o Minor Storm Storage Volume • Major Storm Storage Volume 350 UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2.35, Released January 2015 I 2020.04.28 PS2 Detention, Modified FAA 4/28/2020 2 22 PM Attachment H STAGE -STORAGE SIZING FOR DETENTION BASINS Project: TWP Basin ID: PS2 Pond Design Information (Input): Width of Basin Bottom, W = Length of Basin Bottom, L = Dam Side -slope (H:V), Zd = Stage -Storage Relationship: Dam w' 25.00 80.00 3.00 site Sip Fbr L ft Righ ft Isosceles ft/ft F Gird Side Slope Z Check Basin Shape t Triangle > Triangle ?ectangle e / Ellipse X Irregular Storage Requirement from Sheet 'Modified FAA': Storage Requirement from Sheet 'Hydrograph': Storage Requirement from Sheet 'Full -Spectrum' OR OR OR OR (Use Overide values in cells G32 G52) MINOR MAJOR 0.26 0.26 acre -ft. acre -ft. acre -ft. Labels for WQCV Minor & Major Storage Stages (input) Water Surface Elevation ft (input) Side Slope (H.V) ft/ft Below El. (input) Basin Width at Stage ft (output) Basin Length at Stage ft (output) Surface Area at Stage ft2 (output) Surface Area at Stage ft2 User Overide Volume Below Stage ft3 (output) Surface Area at Stage acres (output) Volume Below Stage acre -ft (output) Target Volumes for WQCV, Minor & Major Storage Volumes (for goal seek) 5090.00 25.00 80.00 2000.0 4.141 I 0.095 0.000 5090.50 3.00 28.00 83.00 2,324.0 4.547 2172 0.104 0.050 WQCV 5091.00 3.00 _ 31.00 86.00 2,666.0 4,967 4,551 0.114 0.104 5091.50 3.00 34.00 _ 89.00 3,026.0 5.402 7,143 0.124 0.164 5092.00 3.00 37.00 92.00 3,404.0 5.850 9,956 _ 0.134 0.229 100-yr 5092.50 3.00 40.00 95.00 3,800.0 6,313 12,997 0.145 0.298 5093.00 3.00 43.00 98.00 4,214.0 6,789 16,272 0.156 0.374 #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A #N/A #N/A #NIA #NIA #NIA #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N /A #N/A #N/A #NIA #NIA #N/A #N/A #NIA #N/A #N/A #N/A #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A 2020.04.28 PS2 Detention Basin 4/28/2020. 2 22 PM Attachment H STAGE -STORAGE SIZING FOR DETENTION BASINS Project: TWP Basin ID: PS2 Pond STAGE -STORAGE CURVE FOR THE POND 5094.00 5093.00 5092.00 5091.00 5090.00 5089.00 5088.00 5087.00 0.00 0.05 0.10 0.15 0.20 0.25 Storage (acre-feet) 0.30 0.35 0.40 I 2020.04.28 PS2 Detention. Basin 4/28/2020. 2 22 PM Attachment H STAGE -D SCHARGE SIZING OF THE WATER QUALITY CAPTURE VOLUME (WQCV) OUTLET Project TWP Basin ID PS2 Pond WQCV Desiqn Volume (Input': Catchment Imperviousness. I. _ Catdrnent Area A = Depth at WQCV outlet above lowest pertoratwn. M Vertical dstance between rows. h = Number of rows, N. = Orifice discharge coefficient. C. _ Slope of Basin Trickle Channel S Time to Dram the Pond Watershed Design Information (Input): Percent Sod Type A = Percent Sod Type 8 a Percent Sod Type C/D = Outlet Drston Information (Output): 55.0 2.59 1 4.80 4.00 0.60 0.040 40 0 0 100 percent acres Diameter of holes. D feet Number of holes per row. N inches ►t/ft hours Height of slot. H - Width of slot. W Water Duality Capture Volume. WQCV Water Dimity Capt.re Vokrne (WQCV) Design Volume (WQCV / 12 • Area • 1.2) Vol = Outlet area per row. A0 = Total opening area at each row based on user-nput above. A0 = Total openng area at each row based on user -input above. A0 0.567 1 28 inches inches inches 0.288 ✓.a!ershed inches 0.062 au -f.teI 0.075 acre-feet 0.25 square inches 0.25 square inches 0.002 square feel O 0 0 O O 0 O 0 0 0 0 0 C. o O 0 O 0 c 0 0 O O 0 i w 0.0 c 0 0 a O 0 O 0 e 0 0 O 0 Perforated Plate Examples Central Elevations of Rows d Moles in feet Row1 Row2 Row3 5090.00 5090.40 5090.80 Row 4 Row 5 Row 6 ROW 7 Row 8 Row 9 5091.20 OW 10 ROW 11 Row 12 Row 13 Row 14 Row 15 Row 16 Row 17 Row /8 Row 19 Row 20 Row 21 Row 22 Row 23 Row 23 5090.00 0.0000 0.0000 5090.50 0.0060 0.0027 5091.00 0.0084 _ 0.0065 5091.50 0.0103 0.0089 5092.00 0.0119 0.0107 5092.50 0.0133 0.0122 5093.00 0.0146 0.0136 SN/A SNA NN/A SWA INA IN/A SNA INA IN/A INA SWA SWA INA *NIA SWA SN/A SWA ItN/A IN/A INA IN/A INA SNA SWA SWA SN/A SNA SWA SWA IN/A SWA SWA IN/A IOWA SWA SN/A SNA INA SN/A SWA INA SN/A IN/A IN/A SWA IN/A IN/A SN/A aMYA INA INA SWA INA SN/A SNA SN A SWA IN/A IN/A AIWA PIA IN/A SWA INA SN/A IN/A INA SN/A IN/A IIN/A 914/A 0.0000 0.0000 0.0038 0.0071 0.0092 0.0110 0.0125 ON/A IN/A SNA INA SN/A SNA SN/A INA SNA SN/A SN/A *NIA SWA SWA MIA PIA INA INA SNA SWA IN/A *NA *NA SWA SWA sN/A IN/A SNA SNA IN/A SNA IN/A INA SNIA SWA SN/A 0.0000 0.0000 0.0000 0.0046 0.0075 0.0096 ! 0.0113 DMA SWA IN/A SNA INA IN/A Collection Capacity for Each Row of Holes in cfs SNA RNA IN/A SWA INA S NA sal/A IN/A * NIA ( SM/A INA lilA SWA MIA SWA S WA SWA SWA ! SWA INA SWA INA SNA SWA SWA PEA MIA MIA IOWA rwa I T Row 0.00 0.01 0.02 0.03 0.04 0.06 0.06 aPPA SNIA MIA I #PIIA *NIA toN/A #N/A #N/A #N/A IN/A IN/A #WA MIA *WA *NA *INIA EWA *11A SI4IA MIA 1.1/11 *MIA _IY/ . ., aMUA MIA *4/A #N/A IN/A IN/A INA #NIA SWA INA *11* SWA EWA Override Area Row 1 Override Area Row 2 Override Area Row 3 Override Area Row 4 Override Area Row 5 Override Area Row 6 Override Area Row 7 Override Area Row 8 Override Area Row 9 Ovemde Area Row 10 Overnde Area Row /1 Override Area Row 12 Override Area Row 13 Override Area Row 14 Override Area Row 15 Override Area Row 16 Override Area Row 17 Override Area Row 18 Override Area Row 19 Override Area Row 20 • Override Area Row 21 Override Area Row 22 Override Area Row 23 Override Area Row 24 2020.04.28 PS2 Detention. WOC V 4/28/2020. 2 22 PM Attachment H STAGE -DISCHARGE SIZING OF THE WATER QUALITY CAPTURE VOLUME (WQCV) OUTLET Proje_t TWP Basin ID PS2 Pond STAGE -DISCHARGE CURVE FOR THE WQCV OUTLET STRUCTURE Stage (feet, elev.) 5093.50 5093.00 5092.50 5092.00 5091.50 5091.00 5090.50 5090.00 5089.50 0.00 0.01 0.02 0.03 Discharge (cfs) 0.04 0.05 0.06 2020.04.28 PS2 Detention. WOCV Attachment H STAGE -DISCHARGE SIZING OF THE WEIRS AND ORIFICES (INLET CONTROL) Project: TWP Basin ID: PS2 Pond Current Routing Order is #5 Design Information (Input): Circular Opening: OR Rectangular Opening Routing Ordcr = I i Mandate') v*S EL Vasa v W S LL Mao v 'Ms EL 1YU wI: HI 11: .fJ v7 Routing Ordcr 23 (Single Stagcl • Fi. I)agru ilonn • . . -A Hl lee 1 VI s Diameter in Inches Width in Feet Length (Height for Vertical) Dia. = W= LorH= Percentage of Open Area After Trash Rack Reduction % open = Orifice Coefficient Cr, = Weir Coefficient C;; Orifice Elevation (Bottom for Vertical) E = Calculation of Collection Capacity: Net Opening Area (after Trash Rack Reduction) OPTIONAL User-Overide Net Opening Area Perimeter as Weir Length OPTIONAL User-Overide Weir Length A.= A,_ = law= Top Elevation of Vertical Orifice Opening, Top = Center Elevation of Vertical Orifice Opening, Cen = #2 Horiz. #1 Vert. #1 Honz. #2 Vert. 4.00 0.75 4.00 0.50 70 100 0.60 0.60 3.00 5092.50 5.091.50 11.20 0.38 13.60 ft. ft. 5092.00 5091.75 inches ft. ft. ft. sq. ft. sq. ft. ft ft. Routing 5: Water flows separately through WQCV plate, #1 horizontal opening, #2 horizontal opening, #1 vertical opening, and #2 vertical opening. The sum of all four will be applied to culvert sheet. Horizontal Orifices Vertical Orifices Labels for WQCV Minor & Major Storage W.S. Elevations (input) Water Surface Elevation ft (linked) WQCV Plate/Riser Flow cfs (User -linked) #1 Honz. #1 Honz. Weir Orifice Flow Flow cfs cfs (output) (output) #2 Horiz. #2 Horiz. Weir Orifice Flow Fbw cfs cfs (output) (output) #1 Vert. Collection Capacity cfs (output) #2 Vert. Collection Capacity cfs (output) Total Collection Capacity cfs (output) Target Volumes for WQCV. Minor 8 Major Storage Volumes (link for goal seek) 5090.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5090.50 0.01 0.00 0.00 0.00 0.00 0.00 0.00 0.01 WQCV 5091.00 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.02 5091.50 0.03 0.00 0.00 0.00 0.00 0.00 0.00 0.03 5092.00 0.04 0.00 0.00 0.00 0.00 0.90 0.00 0.94 100-yr 5092.50 0.05 0.00 0.00 0.00 0.00 1.56 0.00 1 1.61 5093.00 0.05 14.42 38.13 0.00 0.00 2.02 0.00 16.50 #N/A #N/A #N/A #N/A #N/A #N/A 0.00 #N/A #N/A #N/A #N/A *N/A #N/A #N/A 0.00 #N/A #N/A #N/A #N/A #N/A #N/A #N/A 0.00 #N/A #N IA #N/A *N/A #N/A #N/A *N/A 0.00 #N/A #N:A #N/A #N/A #N/A *NIA #N/A 0.00 #N/A #N/A #N/A IN/A *NIA #N/A *N/A 0.00 i #N/A #N/A #N/A #N/A #N/A #N/A #N/A 0.00 #N/A # N /A #N/A #N/A #N/A #N/A #N/A 0.00 #NIA #N 'A #N/A #N/A #N/A #N/A #N/A 0.00 } #NIA # N : A *NIA #N/A #N/A #N/A #NIA 0.00 /A #N/A #N /A #N/A #N/A *N/A #N/A *NIA 0.00 #N/A #N/A #N/A #N/A #N/A #N/A #NIA 0.00 #NIA #N/A #N/A #N/A #N/A #N/A *N/A 0.00 #NIA #N/A #N/A *NIA #N/A #N/A #N/A 0.00 #N/A #N/A #N/A #N/A #N/A #N/A *N/A 0.00 #NIA #N1A #N/A #N/A #N/A #N/A #N/A 0.00 #N/A #N/A #N/A #N/A #N/A #N/A #N/A 0.00 #N/A #N/A #N/A #N/A #N/A #N/A #N/A 0.00 #N/A #NIA #N/A #N/A #N/A #N/A #N/A 0.00 #NIA #NIA #N/A #N/A #N/A #N/A #N/A 0.00 1 #N/A #N/A #N/A #N/A #N/A #N/A #N/A 0.00 I #N/A #N/A #N/A #N/A #N/A #N/A *N/A 0.00 1 #N/A #N1A #N/A #N/A #N/A #N/A #N/A 0.00 #N/A #N/A #N/A #N/A #NIA #N/A #N/A 0.00 #N/A #NiA #N/A #N/A *NIA #N/A #N/A 0.00 #N/A #NiA #N/A #N/A #NIA *N/A #N/A 0.00 #N/A #N/A #N/A *N/A #N/A #N/A *N/A 0.00 #N/A #NIA #N/A #N/A #N/A #N/A #N/A 0.00 #N/A #N/A #N/A *N/A #N/A #N/A #N/A 0.00 #N/A #N/A #N/A #N/A #N/A #N/A #N/A 0.00 #N/A #N/A #N/A #N/A #N/A #N/A #N/A 0.00 #N/A #N/A #N/A #N/A #N/A #N/A #N/A 0.00 #N/A #N/A #N/A #N/A #N/A *N/A #N/A 0.00 :MIA #N/A #N/A #N/A #N/A #N/A #N/A 0.00 #NIA #N/A #N/A #N/A #N/A #NIA #N/A 0.00 #N/A #N/A #NIA #N/A #N/A #N/A _ #N/A 0.00 #N/A #N/A _ #N/A #N/A #N/A #N/A #N/A 0.00 #NIA 2020.04.28 PS2 Detention, Outlet 4/28/2020, 2 22 PM Attachment H STAGE -DISCHARGE SIZING OF THE WEIRS AND ORIFICES (INLET CONTROL) Project: TWP Basin ID: PS2 Pond STAGE -DISCHARGE CURVE FOR THE OUTLET STRUCTURE 5094 5093 5092 Stage (feet, elev.) 5091 5090 5089 5088 5087 _ 0 2 4 0 10 Discharge (cfs) 14 16 18 2020.04.28 PS2 Detention. Outlet 4/28/2020. 2 22 PM Attachment H STAGE -DISCHARGE SIZING OF THE OUTLET CULVERT (INLET vs. OUTLET CONTROL WITH TAILWATER EFFECTS) Project: TWP Basin ID: PS2 Pond Status: Culvert Data is valid' Design Information (Input): Circular Culvert: Barrel Diameter in Inches Circular Culvert: Inlet Edge Type (choose from pull -down list) OR: Box Culvert: Barrel Height (Rise) in Feet Box Culvert: Barrel Width (Span) in Feet Box Culvert: Inlet Edge Type (choose from pull -down list) Number of Barrels Inlet Elevation at Culvert Invert Outlet Elevation at Culvert Invert Culvert Length in Feet Manning's Roughness Bend Loss Coefficient Exit Loss Coefficient Design Information (calculated): Entrance Loss Coefficient Friction Loss Coefficient Sum of All Loss Coefficients Orifice Inlet Condition Coefficient Minimum Energy Condition Coefficient Calculations of Culvert Capacity [output): can sondes Cats %NV r V eta.• w art • Cos Serbs' ralivrt S on tie* • 18 Grooved End with Headwal Height (Rise) = Width (Span) = Square Edge wl 90-'5 deg. Flared W'ngwall No = Iniev = L= n= Ki, K, K„= Kt= Ks = C,1= 1 5090.00 5089.50 70.0 0.0130 _ 0.00 1.00 0.20 1.27 2.47 0.99 -0.09 in. ft. ft. ft. elev. ft. elev. ft. Water Surface Elevation From Sheet 'Basin" (ft., linked) Tailwater Surface Elevation ft (input if known) Culvert Inlet -Control Flow rate cfs (output) Culvert Outlet -Control Flow rate cfs (output) Flow rate Into Culvert From Sheet "Outlet" (cfs, linked) Controlling Culvert Flow rate cfs (output) Inlet Equation Used (output) 5090.00 0.00 0.00 0.00 0.00 0.00 No Flow (WS < inlet) 5090.50 0.00 1.10 3.95 0.01 0.01 Min. Energy. Eqn. 5091.00 0.00 3.50 4.57 0.02 0.02 Regression Eqn. 5091.50 0.00 6.90 5.42 0.03 0.03 Regression Eqn. 5092.00 0.00 9.90 7.63 0.94 0.94 Regression Eqn. 5092.50 0.00 12.30 9.37 1.61 1.61 Regression Eqn. 5093.00 0.00 14.30 10.79 16.50 10.79 Regression Eqn. 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (VVS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A Na Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N1A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #NIA No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (VVS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #NIA #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0 00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (VVS < inlet) 0.00 0.00 0.00 0.00 #N/A #N/A No Flow (WS < inlet) 2020.04.28 PS2 Detention, Culvert 4/28/2020, 2 22 PM Attachment H STAGE -DISCHARGE SIZING OF THE OUTLET CULVERT (INLET vs. OUTLET CONTROL WITH TAILWATER EFFECTS) Project: TWP Basin ID: PS2 Pond STAGE -DISCHARGE CURVE FOR THE FINAL OUTLET PIPE CULVERT 5093.50 5093.00 5092.50 5092.00 Stage (feet, elev.) 5091.50 5091.00 • 5090.50 • 5090.00 • 0.00 2.00 4.00 6.00 8.00 Discharge (cfs) 10.00 12.00 2020.04.28 PS2 Detention. Culvert 4 28/2020, 2 22 PM Attachment H STAGE -DISCHARGE SIZING OF THE SPILLWAY Project: TWP Basin ID: PS2 Pond s Set ssia an Design Information (input): Bottom Length of Weir Angle of Side Slope Weir Elev. for Weir Crest Coef. for Rectangular Weir Coef. for Trapezoidal Weir Calculation of Spillway Capacity (output): L= Angle = EL. Crest = Cv, = Ct = 15.00 71.57 5.092.50 3.00 3.00 Water Surface Elevation ft. (linked) Rect. Weir Flowrate cfs (output) Triangle Weir Flowrate cfs (output) Total Spillway Release cfs (output) Total Pond Release cfs (output) 5090.00 0.00 0.00 0.00 0.00 5090.50 0.00 0.00 0.00 0.01 5091.00 0.00 0.00 0.00 0.02 5091.50 0.00 0.00 0.00 0.03 5092.00 0.00 0.00 0.00 0.94 5092.50 0.00 0.00 0.00 1.61 5093.00 15.91 1.59 17.50 28.29 #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A i #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A #N/A #N/A #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A i #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #NIA #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A #N/A feet degrees feet 2020.04.28 PS2 Detention. Spillway 4/28/2020, 2.22 PM Attachment H STAGE -DISCHARGE SIZING OF THE SPILLWAY Project: TWP Basin ID: PS2 Pond /� STAGE -STORAGE -DISCHARGE CURVES FOR THE POND Stage (feet, elev.) 0 5094 _ 5093 5092 5091 5090 5089 5088 5087 Storage (Acre -Feet) 0.05 0.1 0.15 0.2 0.25 0.3 0 5 10 15 20 25 0.35 0.4 Pond Discharge (cfs) + OTAL aI3CHAR3E - SPILLWAY DISCHARGE --is- POND STORA:3E 30 V 2020.04.28 PS2 Detention, Spillway 4/28/2020, 2:22 PM Section 17 Traffic Narrative This section addresses Procedural Guide Checklist, traffic narrative, WCCSection 23-2-510 C2 c, 23- 2-510 C 2 i, 23-2-510 C 2 k, and 23-2-510 C 2 I, and the USR Questionnaire, Public Works Questions 1 and 2, and the criteria described in WCCSections 23-2-480A2, 23-2-480 A 5, 23-2-490 B, and 23-2- 490 E As discussed during the Pre -Application meetings with Weld County staff on May 27, 2016, August 25, 2016, January 17, 2019 and March 13, 2020, and as stated in Memorandum Pre -Application Meeting prior to submitting USR for water transmission pipeline (PRE20-0036, Case File, pre - application) provided by Weld County staff dated March 13, 2020, which is included in Section 13, and in a February 6, 2020 discussion with Weld County staff, a summary of that discussion is included in section USR Procedural Guide Checklist, a traffic narrative is required to be submitted as part of the USR permit application General Transportation Information The water pipeline alignment, shown in Figure 17.1a and Figure 17.2b, has been developed based on information obtained from surveys, easement holders, Weld County staff, and property owner discussions The TWP includes approximately 34 miles of a buried 42 -inch water pipeline and associated appurtenances in unincorporated Weld County, Colorado The water pipeline alignment for the TWP generally runs in a north/south direction outside', Weld County right-of-way except at road crossings and extends from County Road 92 to County Road 2 as follows • The water pipeline generally parallels County Road 13 for, approximately 14 miles in unincorporated Weld County from County Road 92 to 0 4; miles south of County Road 90 I • The water pipeline transitions east and south to parallel County Road 13, within 0 25 miles east of County Road 13, for approximately 3 6 miles, to 0 5 mile north of Colorado Highway 14 in unincorporated Weld County, then enters the Town of Timnath for approximately 5 3 miles • The water pipeline transitions south out of the Town of Timnath near County Road 72 and parallels County Road 13 to County Road 68%: for approximately 1 6 miles in unincorporated Weld County, then enters the Town of Windsor for approximately 3 5 miles • The water pipeline transitions south out of the Town of Windsor near Crossroads Boulevard and generally parallels County Road 13 for 2 miles to US Highway 34, then transitions east parallel to US Highway 34 for approximately 0 5 miles before transitioning south for approximately 4 4 miles to County Road 50, then enters the Town of Johnstown for approximately 3 7 miles i • The water pipeline transitions out of the Town of Johnstown near County Road 44 and parallels County Road 15 for approximately 1 mile to County Road 42, then transitions east for approximately 0 5 miles then south and generally parallels County Road 15%: for approximately 5 8 miles in unincorporated Weld County and 0 2 miles in the Town of Johnstown to Colorado Highway 66 • The water pipeline transitions east parallel to Colorado Highway 66 for' approximately 0 5 miles to County Road 17 where it transitions south for approximately 14 9 miles (approximately 12 6 miles in unincorporated Weld County) to County Road 2 Approximately 11 miles of the TWP in Weld County are in the 'incorporated limits of Dacono, Firestone, Frederick, Johnstown, Platteville, Severance, Timnath, and Windsor including roads that I TWP USR SUPPLEMENT 2 SECTION 17 TRAFFIC NARRATIVE 17-1 Thornton Water Project i -hula ReaR+wr se a • WILLOX CN -OUVE•ST MAGNOLIA ST MYRTLE ST - '/1 t CAURECST :.- LAUREL T LOCUST -St. SKYWAY OR 33RD ST !- !TH,ST I , 1TH sT T • 10TH ST Thornton WArtR :)"UL; CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/19/2021 RICHARDS LAKE RD C and.S Railroad .CR 20E 114 U 0 s 0.875 VNLLbWtiiNi CR 50 VINE DR LOVELAND..J s _: kitchd Lake TI MNATH rn� .D 1 0 1 j L.';b ` b O • GiOOKEo/ _ Qk�1Y !., Si 'CROSSROADSI D • --1- A---a ti I ?j j/ , I L 1 _ r CR 48 JOHNSTOWN 1.75 1 inch = 1.75 miles Miles BERTHOUD CR 46 Water Tank � CR 72 c/to ssRo CR SO t - Pump Station 1 TWP in Unincorporated Weld County TWP outside Unincorporated "" Weld County —• County Boundary r. CR92 Math Molls Rein:P it `cA SWAN SARK OR CR 54 MILLIKIEN CR 52 om CR 4t} 5Z s 4-:LI- • Qtr ' d Jr • O - Railroad River/Stream/Canal/Ditch Lake/Reservoir OR 54'5 REELEY 37TH ST EVANS CR 48 Figure 17.1a TWP Location Map Sources NHQ C:,7WR WCb County CiOO1 W 14786188_THORNTON_NORTHERN_PROJECTITASK_ORDER 516 t_PERMITTINGCtSWAPFILESWJELD_USRIRESOURCE_MAPSIPERM1TAPP_2021tTWP_LOCATION_MAP MXD JOUAN 1119/2021 12 18 52 PM Thornton Water Project WATER PRC,IEt CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON. CO 80241.2405 1/19/2021 0 S 0.875 TWP in Unincorporated Weld County TWP outside Unincorporated Weld County �• County Boundary 1.75 1 inch = 1.75 mies Miles 1 Railroad River/Stream/Canal/Ditch Lake/Reservoir Figure 17.1b TWP Location Map Sources NHD. CDWR. Wee County. COO T W 1478988 THORNTON NORTHERN PRO.ECTITASK ORDER 5\5 1 PERMITTWGIGISIMAPFILEStWE1D USRIRESOURCE MAPS\PERMITAPP 2021tTWP LOCATION MAPMXD IOUAN1/19702112.18.52PM THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION have been annexed by local governments and so are outside the jurisdiction of this USR permit application. The existing road network has adequate capacity to serve anticipated construction traffic needs, and no new roads or improvements to existing roads are anticipated to be necessary in unincorporated Weld County. After construction, the water pipeline and appurtenances could operate year-round, 24 hours a day; however, the water pipeline and appurtenances, will be unmanned. The existing road network has adequate capacity to serve anticipated TWP operation traffic needs. It is anticipated that normal operations could include up to two TWP operators traveling in one pickup truck daily along the water pipeline route for a visual inspection and maintenance activities during the hours of 8 a.m. to 5 p.m. TWP operators are also anticipated to conduct up to one visit per day of the water tank and pump station locations to inspect security and operation of each facility. Typically, operation of the pump stations, including video monitoring of site security, will be conducted remotely from another Thornton -owned facility. Up to twice per year, it is anticipated that TWP operators will enter vault and manhole appurtenances to exercise valves and conduct routine maintenance of equipment. To the extent practicable, visual inspections will be from public roads to minimize impacts to property owners. In case of emergency, the operators may be on -site outside of the normal operating hours. Consequently, there will be limited effects on the volume of traffic on local streets. The TWP is not located within Weld County ROW or future planned ROW except where it must cross ROW. Thornton understands that, if the TWP crosses Weld County ROW, then use of that ROW will require Weld County approval. Thornton reviewed GMA boundaries and transportation master plans for Berthoud, Dacono Firestone, Frederick, Fort Lupton, Johnstown, Mead, Milliken, Platteville, Severance, Timnath, and Windsor, to determine the extent of future ROW within GMA boundaries. Thornton will coordinate the location of the water pipeline with these municipalities as appropriate where the water pipeline is located within the municipality's boundary. Table 17.1 presents the multiple roads that the water pipeline parallels and intersects and the Annual Average Daily Traffic (AADT) or vehicle per day (VPD) of those roads. The basis for the AADT and VPD data was developed using the Weld County Traffic Volumes Map in the Weld County2045 Transportation Plan, (Weld County, 2020); Street Classification Map -City of Dacono Proposed Road Types, (Dacono, 2018); City of Dacono Field Inventory, Regional Transportation and Drainage Impact Fee Analysis, (Trait & Associates, 2014); Frederick 2015 Comprehensive Plan (Frederick, 2015); Firestone Master Plan, (Firestone, 2013); Town of Johnstown Transportation Master Plan (Johnstown, 2008); Severance Transportation Plan (2015); Town of Timnath Transportation Plan (2015); Town of Windsor Roadway Improvement Plan (2017); and the Online Transportation Information System, (Colorado Department of Transportation) as applicable. TABLE 17.1 Roadway Classifications and Traffic Volumes Roadway Limits Classification AADT (VPD*) Impact County Road 2/168th At Quebec Street Paved, Arterial Service, 1,501- Intersects TWP Avenue maintained by Adams 10,000 County County Road 17 County Road 2 to Y2 Proposed Paved Arterial Not Is parallel to TWP mile north of County Service (not constructed) Available Road 2 TWP USR SUPPLEMENT 2 SECTION 17 TRAFFIC NARRATIVE 17-4 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 17.1 Roadway Classifications and Traffic Volumes Roadway Limits Classification AA DT (VPD*) Impact County Road 17 County Road 4 County Road 6 County Road 8 County Road 10 County Road 12 County Road 17 %2 mile north of County Road 2 to County Road 10 At County Road 17 At County Road 17 At County Road 17 At County Road 17 At County Road 17 County Road 12 to County Road 14 Colorado Highway 52 At County Road 17 County Road 14 County Road 17 County Road 16 County Road 17 County Road 18 County Road 20 County Road 22 County Road 17 County Road 24 County Road 17 County Road 26 At County Road 17 County Road 14 to County Road 16 At County Road 17 County Road 16 to County Road 18 At County Road 17 At County Road 17 At County Road 17 County Road 22 to County Road 24 At County Road 17 County Road 24 to County Road 26 At County Road 17 Gravel, Local Service Gravel, Local Service Paved, Arterial Gravel, Local Service Gravel, Local Service Gravel, Local Service Gravel, Local Service, within the municipal boundary of Dacono Paved, Principal Arterial - Other, owned and maintained by CDOT Gravel, Arterial, within the municipal boundary of Frederick Gravel, Arterial, within the municipal boundary of Frederick Gravel, Local Service Gravel, Local Service Gravel, Local Service Paved, Collector Service Gravel, Local Service Gravel, Local Service Paved, Arterial Street, within the municipal boundary of Firestone Gravel, Rural Route, within the municipal boundary of Firestone Gravel, Rural Route, within the municipal boundary of Firestone 0-500* Is parallel to and intersects TWP 0-500* Intersects TWP 500-5,000* Intersects TWP 0-500* Intersects TWP 0-500* Intersects TWP 0-500* Intersects TWP 0-500* Is parallel to TWP 12,000 Intersects TWP Not Intersects TWP Available Not Is parallel to and available intersects TWP 0-500* Intersects TWP 0-500* Is parallel to TWP 0-500* 0-500* 0-500* 0-500* Not Available Not Available Not Available Intersects TWP Intersects TWP Intersects TWP Is parallel to and intersects TWP Intersects TWP Is parallel to TWP Intersects TWP TWP USR SUPPLEMENT 2 SECTION 17 TRAFFIC NARRATIVE 17-5 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 17.1 Roadway Classifications and Traffic Volumes Roadway Limits Classification AA DT (VPD*) Impact County Road 28 County Road 17 At County Road 17 County Road 28 to Colorado Highway 66 Colorado Highway 66 County Road 13 to County Road 19 County Road 17 County Road 32 County Road 34 County Road 36 County Road 38 County Road 40 County Road 42 County Road 15 Varies between County Road 13 and County Road 15 County Road 13 Colorado Highway 66 to 3,000 feet north of Colorado Highway 66 2,700 feet west of County Road 17 2,560 feet west of County Road 17 2,790 feet west of County Road 17 1,950 feet west of County Road 17 2,400 feet west of County Road 17 2,460 feet west of County Road 17 to County Road 15 County Road 42 to County Road 44 County Road 44 to 1,000 feet south of County Road 50 1,000 feet south of County Road 50 County Road 50 2,400 feet east of County Road 13 County Road 52 2,700 feet east of County Road 13 County Road 52'/ 2,700 feet east of County Road 13 County Road 54 2,500 feet east of County Road 13 Gravel, Local Services Gravel, Local Service Paved, Principal Arterial - Other, owned and maintained by CDOT, within the municipal boundary of Platteville Paved, Arterial Service Gravel, Local Service Paved, Collector Service Gravel, Local Service Paved, Collector Service Gravel, Local Service Gravel, Local Service Gravel, Local Service Within Johnstown municipal boundary Paved, Arterial Paved, Collector Gravel, Local Service Gravel, Local Service Paved, Arterial 0-500* Intersects TWP 0-500* Is parallel to and intersects TWP 11,000 Is parallel to and intersects TWP 500-5,000* Is parallel to and intersects TWP 0-500* Intersects TWP 500-5,000* Intersects TWP 0-500* Intersects TWP 500-5,000* Intersects TWP 0-500* Intersects TWP 0-500* Is parallel to and intersects TWP 0-500* Is parallel to and intersects TWP 0-500* Intersects TWP 500-5,000* Intersects TWP 0-500* Intersects TWP 0-500* Intersects TWP 5,000- Intersects TWP 10,000* TWP USR SUPPLEMENT 2 SECTION 17 TRAFFIC NARRATIVE 17-6 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 17.1 Roadway Classifications and Traffic Volumes Roadway Limits Classification AA DT (VPD*) Impact County Road 56 US Highway 34 County Road 13 County Road 60 County Road 62 County Road 13 County Road 13 County Road 13 2,700 feet east of County Road 13 1,300 feet east of County Road 13 US Highway 34 to County Road 62 At County Road 13 At County Road 13 County Road 62 to County Road 68 %2 County Road 68 Y2 to County Road 72 County Road 72 to 2,600 feet north of Colorado Highway 14 Colorado Highway 14 At County Road 13 County Road 13 County Road 84 County Road 86 County Road 88 County Road 90 County Road 13 2,600 feet north of Colorado State Highway 14 to County Road 84 800 feet east of County Road 13 1,270 feet east of County Road 13 1,300 feet east of County Road 13 At County Road 13 1,800 feet south of County Road 90 to County Road 92 Gravel, Local Service Paved, Principal Arterial - Other, owned and maintained by CDOT Paved, Arterial Gravel, Local Service Paved, Arterial, within the municipal boundary of Windsor Within Windsor municipal boundary Paved, Arterial Within Timnath municipal boundary Paved, Principal Arterial - Other, owned and maintained by CDOT Gravel, Local Service Paved, Local Service Gravel, Local Service Gravel, Local Service Gravel, Local Service Gravel, Local Service 0-500* Intersects TWP 49,000 Intersects TWP 50-5,000* Is parallel to TWP 0-500* Intersects TWP Intersects TWP 500-5,000* Is parallel to and intersects TWP 10,000 Intersects TWP 0-500* Is parallel to TWP 500-5,000* Intersects TWP 0-500* Intersects TWP 0-500* Intersects TWP 0-500* Intersects TWP 0-500* Is parallel to TWP Notes: 1. Roads are owned and maintained by Weld County unless otherwise indicated. 2. Lengths indicated in table are approximate. *Weld County 2045 Transportation Plan Figure 27 Traffic Volumes Map (2015) shows VPD. TWP USR SUPPLEMENT 2 SECTION 17 TRAFFIC NARRATIVE 17-7 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION The TWP crosses multiple railroads. Railroad crossings will be coordinated with the applicable railroad operator and required license agreements will be obtained from the appropriate railroad company. Table 17.2 presents a description of the railroads crossed by the TWP; Figure 17.2a and Figure 17.2b show the locations of the railroads. TABLE 17.2 TWP Railroad Crossings Crossing No. Location Class Operator 1 2 3 4 5 6 7 8 9 450 feet north County Road 17 and County Road 4 intersection 2,100 feet south of County Road 17 and State Highway 66 intersection 2,300 feet east of County Road 15 and County Road 42 Within Johnstown municipal boundary; 2,400 feet south and 2,600 feet south of County road 13 and Colorado Highway 60 1,700 feet south and 2,500 feet east of County Road 13 and County Road 56 intersection 500 feet south and 2,600 feet east of County Road 13 County Road 56 intersection 1,200 feet east of County Road 13 and US Highway 34 intersection 6,500 feet south of County Road 13 and County Road 74 intersection Is parallel to/crosses County Road 13 north and south of Colorado Highway 14 Abandoned Abandoned 3 3 3 1 3 3 Abandoned Formerly Union Pacific Rail Road Formerly Union Pacific Rail Road Great Western Great Western Great Western Union Pacific Rail Road Great Western Great Western Notes: 2. Lengths indicated in table are approximate. Weld County 2045 Transportation Plan The TWP was reviewed in conjunction with the area goals and transportation improvement plans outlined in the Weld County 2045 Transportation Plan, (Weld County, 2020). The Weld County 2045 Transportation Plan identifies multiple short range, mid -range, and long-range improvement needs within the TWP area. If these improvement projects occur within the timeframe of the construction of the TWP ("overlap"), Thornton will work with Weld County and other involved parties to coordinate construction and minimize disruption. TWP USR SUPPLEMENT 2 SECTION 17 TRAFFIC NARRATIVE 17-8 Thornton Water Project YClivaiveroseni Reservoir A 4 , •.�•• •• 80 �• lines ea 1 . . J f i _,BERTHOUD cR 18 /r as .. CR 12 a 10 34 O; CR 10 Thornton Ned L CITY OF THORNTON COLORADO n� U S Railroad Crossing -4S_ CR 46 TWP in Unincorporated a Weld County TWP outside Unincorporated Weld County —• County Boundary Q Z w 1 1 Railroad River/Stream/Canal/Ditch Lake/Reservoir f -=J NjJ N N N 0 CR 48 Figure 17.2a Railroad Crossings 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/22/2021 0 0.875 1.75 1 inch = 1.75 miles Miles W t4T6p88_THORNTON_NORTHERN PRO,ECT1TASK_ORDER_516 1_PERMITTINGIGISIMAPFILESNNELD_USRIRESOURCE_MAPSWERMITAPP_20211RA4ROAD_CROSSINGS MXD .IOUAN 1/220021 11 23 34 AM Sources USGS Nr+O CDWR_ Weld County CDOT Thornton Water Project Thornton WATER PROJECT CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241.2405 1/22/2021 0 S 0.875 1.75 1 inch = 1.75 miles Miles TWP in Unincorporated Weld County TWP outside Unincorporated Weld County —• County Boundary -+- Railroad River/Stream/Canal/Ditch Lake/Reservoir Figure 17.2b Railroad Crossings Sources: USGS. NHD. CDWR. Weld Coumn, CDOT W W78988 THORNTON NORTHERN PROJECTITASK ORDER 515 1 PERMIrTINGIGISWAPFlI_SIWELD USRIRESOURCE MAPSIPERMITAPP 20211RAILROAD CROSSINGS MXD JQUAN 112212021 11 23 N AM THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Short range improvement projects identified in the Weld County 2045 Transportation Plan that overlap the TWP include the following: • County Road 54 from County Road 13 to County Road 15 rebuild and widen to add shoulders • County Road 2 Access Control Plan from County Road 11 to Interstate 76 Mid -range improvement projects identified in the Weld County 2045 Transportation Plan that overlap the TWP include the following: • County Road 17 from County Road 32 to Colorado Highway 66 rebuild and widen to add shoulders • County Road 17 Access Control Plan from Colorado Highway 66 to Crossroads Boulevard Long range transportation improvement projects identified in the Weld County 2045 Transportation Plan that overlap the TWP include the following: • Improve County Road 13 widen to 3 lane Collector Standard from County Road 48.5 to County Road 54 • Drainage Improvements • Colorado Highway 66 and County Road 17 (north and south) intersection improvement (signal or roundabout) Weld/Adams County Line Crossroads Alignment Study, (Felsburg Holt & Ullevig, 2008 October) was adopted by the Weld County Board of County Commissioners in November 2008. The study includes conceptually how best to realign County Road 17 and Quebec Street to provide a smooth transition across County Road 2. Thornton, working with the land owner, has identified and located the permanent easement and water pipeline alignment outside of the anticipated future County Road 17 ROW. Other Considerations Thornton places a high priority on safety during construction. TWP contractors will implement traffic management plans based upon local traffic control requirements and general safe operating practices. Any roads impacted during construction will be restored to pre -construction conditions upon completion of the TWP. Traffic impacts after completion of the construction of the TWP are expected to be limited as the water pipeline and associated appurtenances will be unmanned and operations will require limited traffic. Therefore, no level -of -service calculations or traffic modeling have been performed; however, the following elements are discussed in this Section: • Trip Generation • Project Access • Possible Haul Routes to Be Used During Construction and the Weight of the Loads, including Delivery and Commuting Routes • Travel Distribution • Material Storage • Parking and Vehicle Storage • Construction in ROW • Permits Trip Generation During the construction phase of the TWP, trip generation will be primarily related to construction activities, including delivery of materials and equipment, worker transport, and water pipeline and TWP USR SUPPLEMENT 2 SECTION 17 TRAFFIC NARRATIVE 17-11 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION appurtenances installation. Types of construction vehicles accessing the construction area will likely include those presented in Table 17.3. TABLE 17.3 Anticipated Construction Vehicles Construction Phase Vehicle Preparing the TWP Easements Equipment Transport Truck for Construction Dump Truck Loader Track Excavator Motor Grader Crew Truck Service Truck Inspection Vehicle Pipeline Trenching and Installation Backfilling Re-grading/Reseeding Pipe/Material Hauling Truck Equipment Transport Truck Pipe Installation Crew Truck Inspection Truck Concrete Truck Track Excavator Loader Dump Truck Welding Truck Water Truck Equipment Transport Truck Dump Truck Loader Track Excavator Crew Truck Inspection Truck Concrete Truck Water Truck Compaction Equipment Equipment Transport Truck Motor Grader Reclamation Vehicle Crew Truck Inspection Vehicle Water Truck TWP USR SUPPLEMENT 2 SECTION 17 TRAFFIC NARRATIVE 17-12 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Construction activities for TWP are proposed to begin in 2020 with operation of the TWP system scheduled to begin in 2025 after construction of all TWP packages is complete. Construction of each mile of water pipeline is expected to last between 4 and 10 weeks not including revegetation activities. Construction of the water tank is expected to last approximately 1 year, and construction of the pump stations is expected to last 2 years. Trip generation will vary according to the phase and location of construction. On average, five trips per day to the site are expected for each type of construction vehicle: pickup trucks, welding trucks, pipe/material hauling trucks, water trucks, and equipment transport trucks for each construction package. Construction work hours will typically be from 7 a.m. to 7 p.m. Monday through Saturday unless otherwise approved by Weld County. Construction may extend beyond these hours on an as - required and case -by -case basis. For example, some construction activities, such as hydrostatic testing, require 24/7 operation, and shift work may be required. Traffic is expected to peak when construction crews commute to and from work each day between 6:30 a.m. and 7 a.m. and between 7 p.m. and 7:30 p.m. in passenger vehicles. Construction of multiple water pipeline construction packages and trench less pipeline packages may occur concurrently with crews of 10 to 25 workers each. At the peak of construction, approximately 80 to 100 workers could be required at multiple sites along the TWP. Post -construction trip generation will be primarily related to the operation and maintenance of the TWP. It is anticipated that normal operations could include up to two TWP operators traveling in one pickup truck daily to the water tank, pump stations, and along the water pipeline route for a visual inspection and maintenance activities during the hours of 8 a.m. to 5 p.m. Up to twice per year, it is anticipated that TWP operators will enter vault and manhole appurtenances to exercise valves and conduct routine maintenance of equipment. To the extent practicable, visual inspections will be from public roads to minimize impacts to property owners. In case of emergency, the operators may be on -site outside of the normal operating hours. Consequently, there will be limited effects on the volume of traffic on local streets. Project Access Access along the TWP route will be along roadways, at existing access locations when practicable and at new proposed locations. Possible existing and new proposed access locations for permanent and temporary use along the water pipeline alignment and at the water tank and pump station sites are identified on Figure 17.3a and Figure 17.3b. As discussed with Weld County Public Works staff, locations are subject to change based on TWP contractors' needs. Thornton will obtain individual Weld County, CDOT, and other municipal access permits for any necessary temporary and permanent access locations as applicable. If access is needed using private roads or drives, Thornton or the TWP contractors will negotiate use with owners. Stabilized construction entrances/exits will be installed, as necessary, at access locations from paved roads. Permanent access locations will be designed per Weld County and municipal standards based on location of access. Temporary access will be unpaved and used primarily for transport of materials, equipment, and construction workers. Temporary and permanent access locations will be closed to the public. Temporary access locations could include warning signs, flaggers, and controlled access, as necessary. Additionally, gates or other approved barriers on temporary access roads may be utilized when construction workers are not present to control unauthorized access. Temporary access locations will be restored to pre - construction conditions upon the completion of construction. TWP USR SUPPLEMENT 2 SECTION 17 TRAFFIC NARRATIVE 17-13 Thornton Water Project irr +' TRILBY RD .50TH ST i, 22NDST 118 Ci:l THISL 214.4k J0 O w Z N Thornton YiA'E N_c.,_Ec; CITY OF THORNTON COLORADO 12450 WASHINGTON ST JOHNSTOWN 0 0.875 1 75 Miles T `L BERTHOUD CR 46 TWP in Unincorporated Weld County TWP outside Unincorporated I "" Weld County -- County Boundary 7'M • W 46sr-ru ) � a ."'. W J x Y Railroad River/Stream/Canal/Ditch Lake/Reservoir Existing Access Location New Access Location CR 46 Figure 17.3a Possible TWP Access Locations THORNTON, CO 80241-2405 1/19/2021 1 inch = 175 miles Sources NHO, CDVVR V1ktd County CDOT W t478988_THORNTON_NORTHERN_PROJECTITASK_ORDER_5L5 1_PE RAC NG1GISW1APFILESIWELD_USRIRESOURCE_MAPS\PERMITAPP_20211ACCESS_LOCATPONS MXD JOUAN 1/194021 2 44 32 PM Thornton Water Project .I BROOMFIELD,, or 1�� . 7. Au/NE U,p,....-----•r -1 i a �4 NyA DR_O p ¢Z -. ,10 • -•e. _•• eve arc n r1Nb�i / co CH -OR P a • 1�, r t P1t (1- • a • O .T 1 160THAVE ti t Z t Thornton CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON. CO 80241-2405 1/19/2021 0 S 0.875 1.75 1 inch = 1 75 miles Miles TWP in Unincorporated Weld County TWP outside Unincorporated 'III Weld County —• County Boundary Railroad River/Stream/Canal/Ditch Lake/Reservoir • Existing Access Location • New Access Location Figure 17.3b Possible TWP Access Locations Sources. NHD, COWR, Wein County. COOT W 1418988 THORNTON NORTHERN PROJEC MASK ORDER 515 PERMITTtNG1GtSMAPFILESIWELD USRIRESOURCE MAPSIPERMITAPP 202f ACCESS LOCATIONS.MX0 JQUAN 1119/2021 2 44.32 PM THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Permanent access locations have been negotiated with property owners as part of easement acquisition. Permanent access locations are shown on the USR Maps. Access to the water tank will be a new gravel access from County Road 13. Access to Pump Station 1 is from County Road 50 and an existing permitted access (APOG19-004 Kerr McGee Gathering LLC). Access to Pump Station 2 will be a new paved access from County Road 2. Possible Haul Routes to Be Used During Construction and the Weight of the Loads, including Delivery and Commuting Routes It is anticipated that access to the TWP will be required along Interstate 25, Interstate 25 frontage roads, Colorado Highways, County Roads and other local roads. Construction equipment will be transported utilizing semi -tractor and flatbed trailers, or comparable equipment, with gross vehicle weights estimated between 40,000-80,000 lbs. Construction personnel are anticipated to utilize 1 -ton pickup trucks and comparable sized vehicles. Truck haul routes for material deliveries from off -site locations will be chosen to facilitate safe and expedient delivery while minimizing traffic impacts. It is expected that the daily commuting route for construction workers would also follow the same roads as the truck haul routes to the construction site or temporary staging areas for parking. The major roads and highways within Weld County that could be utilized for delivery of construction materials and construction worker trips as part of construction operations are presented in Table 17.4 and shown in Figure 17.4a and Figure 17.4b. TABLE 17.4 Possible Haul, Delivery, and Commuting Routes County or Major Roads Colorado Highways Federal Highways County Road 2, County Road 9, County Road 10, County Road 13, County Road 15, County Road 17, County Road 18, County Road 19, County Road 20, County Road 24, County Road 26, County Road 28, County Road 32, County Road 34, County Road 36, County Road 38, County Road 40, County Road 42, County Road 44, County Road 48, County Road 50, County Road 52, County Road 54, County Road 56, County Road 681/2, E Crossroads Boulevard, E Harmony Road, E Prospect Road, County Road 84, County Road 86, County Road 88, Larimer County Road 3, Larimer County Road 50, Larimer County Road 52 Colorado Highway 14, Colorado Highway 52, Colorado Highway 66, Colorado Highway 60, Colorado Highway 392 Interstate 25, Interstate 25 Northeast Frontage Road, US Highway 34 Anticipated haul routes are shown in Figure 17.4a and Figure 17.4b. It is not expected that any road improvements or closures would be required to facilitate the transport of materials. In the event that a closure is necessary, the duration of the closure will be minimized, and Weld County standards and procedures will be followed. TWP USR SUPPLEMENT 2 SECTION 17 TRAFFIC NARRATIVE 17-16 Thornton Water Project I • CR 10 a U U U AL r JOHNSTOWN '' 4t BERTHOUD w J - •Q. •c d z CR J6 (?Thornton ` wArER PROJEG, CITY OF THORNTON COLORADO 12450 WASHINGTON ST 0 S 0.875 1.75 Miles TWP in Unincorporated Weld County TWP outside Unincorporated I "" Weld County —• County Boundary —}— Railroad River/Stream/Canal/Ditch Lake/Reservoir 141, Possible Haul Route Figure 17.4a Possible Haul Routes THORNTON, CO 80241-2405 1/22/2021 1 inch = 1.75 miles So,.•ces \'C „--.R .k a Co.^'r CDO' WM78968_THORNTON_NORTHERN_PROJECT\TASK_ORDER_SAS'_aERMTTINGC SW APciLESWEL0_“SR1RES0URCE_MAPSIPERMiTAPP 20211POSSIBLE_HAUL_ROUTESMXO .OUAN'T22Q071105339 AM Thornton Water Project r+ *ATER PROJEC' Thornton CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241.2405 1/22/2021 0 S 0.875 1.75 1 inch = 1.75 miles Miles • TWP in Unincorporated Weld County TWP outside Unincorporated Weld County County Boundary Railroad River/Stream/Canal/Ditch Lake/Reservoir ♦0. Possible Haul Route Figure 17.4b Possible Haul Routes Sources. NHD. CDWR, We a County, COO T W 4/1988 THORNTON NORTHERN PROJECT)TASK ORDER 5t5 PERMIT TNGIGISWAPfILESIWELD USRIRESOURCE MAPSIPERMITAPP 202TIPOSSSLE HAUL ROUTES MXD JQUAN 'O2202' '053 39 AM THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Bridges in the area and along the haul routes listed as Poor in the Federal Highway Administration's 2019 National Bridge Inventory are presented in Table 17.5. Structures posted for load restrictions near the TWP are presented in Table 17.6. TWP contractors will follow applicable laws and load restrictions as required. TABLE 17.5 Structurally Deficient Bridges Near the TWP Roadway Location Structure Number* Rating Impact County Road 12 0.3 miles east of County DAC012.0-013.0A Poor Road 13 County Road 17 0.3 miles north of WEL017.0-004.0A Poor County Road 4 County Road 20 0.7 miles east of County FRSTN20.015.0A Poor Road 15 County Road 34 0.3 miles east of County WEL034.0-017.0A Poor Road 17 1-25 Frontage Road 0.5 miles south of C -17-G Poor Colorado Highway 402 Prospect Road Interstate 25 B -16 -AM Poor Near TWP Along TWP Near TWP Near TWP Along potential haul route Along potential haul route *Notes: Structure number designation from Federal Highway Administration's 2019 National Bridge Inventory InfoBridge Tool. TABLE 17.6 Structures Posted for Load Restrictions Near the TWP Roadway Location Structure Load Restriction Status Rating Impact Number* County Road 44 0.4 miles east of BER-0.0-CR44 Interstate 25 Indicated as posted for load in 2018 National Bridge Inventory Not Deficient Near TWP, along potential haul route Colorado 3.9 miles east of C -17 -FM Indicated as Not Deficient Near TWP Highway 60 Junction Colorado Weight Highway 257 North Restricted on CO Trip *Notes: Structure number designation from Federal Highway Administration's 2019 National Bridge Inventory InfoBridge Tool. Travel Distribution The travel distribution of travel routes for construction cannot be identified at this time. Travel distribution depends on the TWP contractors who will be selected during a bid process after design is complete. The TWP contractors will be responsible for providing materials for construction. The water pipeline is anticipated to be transported from out of state. Construction staff and other TWP USR SUPPLEMENT 2 SECTION 17 TRAFFIC NARRATIVE 17-n THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION deliveries are anticipated to travel from the south from the Denver metropolitan area and from the north from Greeley or Fort Collins. Travel routes post -construction are anticipated to occur from the south from Thornton (95%). Maintenance vehicles may travel from the north for maintenance of the northern portion of the water pipeline or in the event of an emergency (5%). Material Storage The water pipe and other materials are expected to be transported via truck haul routes to the temporary and permanent easement or temporary staging areas. When possible, Thornton plans to off-load and string pipe along the easements as it is delivered to reduce the number of trips required for material delivery. Thornton will comply with Weld County regulations regarding material storage, transport, and land use. Parking and Vehicle Storage Parking and vehicle storage during construction will be primarily on property within the permanent or temporary easement or at temporary staging areas. When additional parking is required, Thornton will negotiate with landowners and commercial businesses for available parking to avoid parking in the public ROW. Temporary staging areas for parking and worker buses or shuttles to transport workers to the active work site may also be implemented to reduce traffic when practicable. Construction workers will be instructed to abide by applicable laws and regulations both while commuting to and working at the TWP site. Construction in ROW The TWP is not located within Weld County ROW or future planned ROW except where it must cross ROW. Thornton understands that, if the TWP crosses Weld County ROW, then use of that ROW will require Weld County approval. The TWP transitions from one side of the road to the other at multiple locations to minimize impacts to property owners, existing structures, including buildings, irrigation ditches, oil and gas facilities, other utilities, and other infrastructure. Full or partial road closures could be required for TWP installation at road crossings in unincorporated County ROW. Weld County standards will be followed and permits will be obtained for any required closures. ROW will be restored to pre -construction conditions and in accordance with Weld County standards. Road Crossings Unless required otherwise by Weld County, water pipeline road crossings, including the appurtenant buried fiber optic cable, in unincorporated Weld County will be constructed using open -cut construction. Road closures with detour routes or partial road closures could be required. Weld County standards will be followed, and permits will be obtained for any required closures. ROW will be restored to pre -construction conditions and in accordance with Weld County standards. Weld County Public Works staff has indicated a preference that crossings of paved roads utilize trenchless construction methods. The TWP construction will utilize trenchless construction methods to cross Weld County roads where required by Weld County. Additional temporary construction easements could be required to accommodate trench less construction methods. Where trenchless construction methods are used, shafts will be located on either side of the road for launching and receiving the water pipeline and the fiber optic cable. These shafts are expected to be located outside the ROW, if feasible. Equipment, pipe/materials, and temporarily stockpiled excavated material from the trench less installation operation are expected to be stored on either side of the TWP USR SUPPLEMENT 2 SECTION 17 TRAFFIC NARRATIVE 17-20 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION road. Weld County standards will be followed, and permits will be obtained as required. Shafts will be backfilled and compacted, and affected areas will be restored to pre -construction conditions. Permits Required access permits from Weld County will be obtained for access from any Weld County road prior to start of construction. Access permit application(s) will be submitted to the Public Works Department (Engineering). The TWP will abide by the Weld County Access Policy (WCC, Chapter 8, Article XIV) as applicable. Weld County ROW permits will be obtained for road crossings and to construct the water pipeline within Weld County ROW. Requirements and stipulations of the permits will be followed. As part of the permit applications mentioned above, Thornton or its contractors will develop detailed traffic control plans that include adequate levels of service and safety measures for construction. Sample road closure types that may be implemented, as required, are shown in Figure 17.5. Access will be maintained to local area residents. Emergency vehicle access needs will be maintained and construction activities coordinated with local fire departments, police departments, ambulance services, and other emergency responders. i r (A) W (B) i t (C) FIGURE 17.5 Sample Road Closure Types (A) Road Closure with Diversion, (B) Partial Road Closure with Flaggers, (C) Road Closure with Diversion TWP USR SUPPLEMENT 2 SECTION 17 TRAFFIC NARRATIVE 17-21 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Mitigation Measures Thornton and/or the TWP contractors will implement traffic strategies to minimize or mitigate traffic disruption from construction activities that could include the following: • To minimize impacts to public roads or bridges directly affected by the TWP, Thornton may provide maintenance as needed. • To minimize conflicts between TWP traffic and local traffic, transport of materials could occur during off-peak hours when practicable. Movements of normal heavy trucks (not oversized) could also be minimized during peak hours to the extent possible. Delivery truck personnel and construction workers may be notified of potential height restrictions and overhead obstructions. If at any time vehicles of excess size or weight are required on Weld County roads or bridges, the Weld County Public Works Department will be consulted and a Special Transport Permit will be obtained. Further detailed delivery routes and concerns will be addressed during the detailed design phase of the TWP, including verification that bridge crossings on the delivery route have adequate strength and capacity. • Thornton will adhere to Weld County limitations on road closures and construction during peak traffic hours, requirements regarding end -of -day conditions, and mandatory inspections. Whenever possible, the existing number of lanes will be maintained during construction. Temporary road closures or traffic control flaggers will be coordinated with Weld County and local law enforcement. If speed limit reduction is required, such reduction will be in accordance with CDOT Form 568, CDOT Temporary Speed Limit Reductions. Traffic control measures such as traffic control flaggers, warning signs, lights, and/or barriers will be implemented to provide safety and efficient progression of traffic. • To minimize the impacts of construction on the local community, Thornton will coordinate with Ault -Highland RE -9, Windsor RE -4, Johnstown -Milliken RE -5(J), Valley RE -1, Saint Vrain Valley RE - 1(J), and Fort Lupton RE -8 School Districts regarding construction and haul routes and school bus traffic. • Construction within Weld County ROW will conform to the Weld County Right -of -Way Use Permit Policy in the WCC, Chapter 8, Article XIII. • TWP contractors will use water trucks to control dust as necessary and will implement required dust control mitigation treatments. Post -construction, disturbed areas will be restored to their pre -construction condition and further dust control mitigation is not expected to be necessary. • Stabilized construction entrances/exits will be installed, as necessary, at the intersections of the TWP temporary access locations with paved roads. Significant soil transferred onto paved roads will be removed as necessary to maintain the quality of Weld County roads and state highways. • Access will be maintained to local area residents. • Emergency vehicle access needs will be maintained and construction activities coordinated with local fire departments, police departments, ambulance services, and other emergency responders as necessary. TWP USR SUPPLEMENT 2 SECTION 17 TRAFFIC NARRATIVE 17-22 Section 18 Sign Plan, If Applicable This section addresses Procedural Guide Checklist, a sign plan, if applicable. A sign plan is not applicable to the TWP. On February 6, 2020, Weld County staff stated that a sign plan is not applicable to the TWP. However, as requested by Weld County staff, Thornton includes the following statement with respect to signs that may be associated with the TWP like temporary construction signs and signs at the pump stations and water tank sites: Sign standards indicated in WCC Chapter 23, Article IV, Division 2 and WCC Appendices 23-C through E will be followed as applicable for TWP signs. A summary of that discussion is included in section USR Procedural Guide Checklist. TWP USR SUPPLEMENT 2 SECTION 18 SIGN PLAN, IF APPLICABLE 18-1 Section 19 Nuisance Abatement Plan, If Applicable This section addresses Procedural Guide Checklist, nuisance abatement plan, if applicable. A nuisance abatement plan is not applicable to the TWP. On February 6, 2020, Weld County staff stated that a nuisance abatement plan is not applicable to the TWP. A summary of that discussion is included in section USR Procedural Guide Checklist. TWP USR SUPPLEMENT 2 SECTION 19 NUISANCE ABATEMENT PLAN, IF APPLICABLE 19-1 Section 20 Landscape and Screening Plan, If Applicable This section addresses Procedural Guide Checklist, a landscape and screening plan, if applicable. A landscape and screening plan is not applicable to the TWP. On February 6, 2020, Weld County staff stated that a landscape plan is not applicable to the TWP. A summary of that discussion is included in section USR Procedural Guide Checklist. TWP USR SUPPLEMENT 2 SECTION 20 LANDSCAPE AND SCREENING PLAN, IF APPLICABLE 20-1 Section 21 Decommissioning Plan, If Applicable This section addresses Procedural Guide Checklist, decommissioning plan and WCC Section 23-2-510 C.2. j. Thornton has no intent to decommission the TWP. The TWP facilities will be maintained, monitored, and repaired/replaced as needed. TWP USR SUPPLEMENT 2 SECTION 21 DECOMMISSIONING PLAN, IF APPLICABLE 21-1 Section 22 Draft Emergency Incident Action Plan, If Applicable This section addresses Procedural Guide Checklist, draft emergency incident action plan and WCC Section 23-2-510.C.2.g. The majority of the TWP is in the planning phase of the project. As discussed with Weld County staff on February 6, 2020, information that is available in this phase of the TWP will be included in a draft emergency incident action plan. After design activities are complete, the remaining information will be developed. The draft emergency incident action plan that follows was developed using a template provided to Thornton from Weld County Office of Emergency Management. It is not intended to be used in an emergency. Thornton understands that a condition of approval of Supplement 2 will include the requirement of submission of a final Weld County approved emergency incident action plan. Further, that Weld County approval of a Final Thornton Water Project Emergency Incident Action Plan will be required before operation of the TWP. A summary of the February 6, 2020 discussion is included in section USR Procedural Guide Checklist. TWP USR SUPPLEMENT 2 SECTION 22 DRAFT EMERGENCY INCIDENT ACTION PLAN 22-1 DRAFT Thornton Water Project Emergency Incident Action Plan. 15, May 2020 *Information provided in this DRAFT Plan is intended to meet Section 23-2-510 C.2.g of the Weld County Code and the USR Procedural Guide only. It is not intended to be used in an emergency. Thornton understands that Weld County approval of a Final Thornton Water Project Emergency Incident Action Plan will be required before operation of the Thornton Water Project. DRAFT Thornton Water Project Emergency Incident Action Plan for Weld County City of Thornton/Thornton Water Project 303-255-7720 Date: May 15, 2020 *Information provided in this Plan is intended to meet Section 23-2-510 C.2.g of the Weld County Code and the USR Procedural Guide only. It is not intended to be used in an emergency. Thornton understands that Weld County approval of a Final Thornton Water Project Emergency Incident Action Plan will be required before operation of the Thornton Water Project. 1 DRAFT Thornton Water Project Emergency Incident Action Plan. 15, May 2020 1. Name: City of Thornton 2. Location: Physical addresses for facilities have not been issued. See attached map with GPS coordinates 3. Emergency Telephone Numbers: Thornton Water Project Facility Primary: Fire District Day 303-255-7720 911 Night 303-255-7720 911 Location Fire Protection District From WCR 92 to WCR 90 Nunn Fire Protection District From WCR 90 to WCR 86 Ault -Pierce Fire Department From WCR 86 WCR 78 Poudre Fire Authority From WCR 78 to 0.50 miles south of State Highway 34 Windsor Severance Fire Rescue From 0.50 miles south of State Highway 34 to WCR 36 Front Range Fire Rescue WCR 36 to 0.28 miles south of WCR 34; from 0.55 miles north of State Highway 66 to WCR 26 Platteville-Gilcrest Fire Protection District 0.28 miles south of WCR 34 to 0.55 miles north of State Highway 66; from WCR 24 to WCR 22; west of WCR 17 from WCR 14 WCR 6 Mountain View Fire Rescue From WCR 26 to WCR 24; from WCR 20 to 0.04 miles south of WCR 16; from 0.05 miles south of WCR 16 to WCR 14 Frederick -Firestone Fire Protection District From WCR 22 to 0.20 miles north of WCR 20; from 0.04 miles south of WCR 16 to 0.50 miles south of WCR 16; east of WCR 17 from WCR 14 WCR 6 Fort Lupton Fire Protection District From WCR 6 to WCR 2 Brighton Fire Rescue District "Information provided in this Plan is intended to meet Section 23-2-510 C.2.g of the Weld County Code and the USR Procedural Guide only. It is not intended to be used in an emergency. Thornton understands that Weld County approval of a Final Thornton Water Project Emergency Incident Action Plan will be required before operation of the Thornton Water Project. 2 DRAFT Thornton Water Project Emergency Incident Action Plan. 15, May 2020 C.:. Lake CITY OF THORNTON COLORADO 12450 wA5HINGTON ST THORNTON. CO80241-2405 3/31/2020 a wives THORNTON NORTHERN PROJECT TASI•� ORDER _St _PER YT TINC\O1t.MAPs ILESW /E1.D-USR'EMERO ENC'f_ACTION PLANIEAP 41x17 MXD JOUAN 3/SW0M Thornton Water Project Last Ina f \_l N0yN11. MAR RR Alignment:405036,-104.9438 S%3ra rill ,reRRsvnwi GP CSSPCADS 60 Rise. en»;AIktRMroi: a Water Pipeline lignment: 40.3265,-104.9294 Leadr/ :- R . Si R s« aN� BMMA ST k S 0 0 875 1 75 Miles 1inch =334miles DACONO Water Pipeline Alignment: 40.6390; 104.9437 Water Pipeline Alignment 40.6262,-104.9392 Irk Balks Roar* nirs WaterPiipelineAlignment: 40.6119; 1049394 Niter Pipeline Alignment: 40.6989,-104.9389 Water Pipeline�Alignment:406874,)104.9439 Water PipelinE Alignment: `40.6732,-104:9441 Water Pipeline Alignment: 40.5608,-104.9441 Water Alignment: 40,-104.9442 tart PlpiUne Alignment: 40.6318,-104:9442 '� iTNJP/F �;� rsids \ ) 00.1,-4 ST Water Pipsline Alignment: 40.51w744,,/-1104.94 j42i` SwiNAVE e•- \ V- �. Water.Pipeline Alignment: 40.4913,-104.9.436 - Mato. r.w % eter PipelineAlignment: 40.4775.-104.9444 W`atertPipeline Alignment: 40.4638.-104.9438 IMNDSOR 1— W'ater'P►peline Alignment:,40.4493,-1049438 Water Pipeline Alignment: 40.4348.-104.9438 '1 atosT� 4TWrT STNST! Water Pipeline"AlIgnment'40A203 104:9439 F.` ION ST Water Pipeline Alignment:40.4082,-104.9399 trysts DIN), Sit s‘ A. ATM St 12""GREELEY$ 5 _ Water Pipeline Alignment:1403980,=1� Water Pipeline Alignment: 40.3860,-104.9360 pTy 5T r lSCOW f � Water Pipeline Alignment: 40.3708,-104.9367 EVANS ` Pump Station *1 40 3484,-104 9374 -"257 te Water Pipeline Alignment:_40.3363.-104.9374 tarter Plpel i Allgnnierit: 40.3163,-104.9232 Water Pipeline Alignment: 40.3%1,-104:9228 Water Tank Location 40 6513,-104 9431 J ,Water Pipeline Alignment: 40 2677,-104.9134 Water Pipeline Alignment: 40.2560104 9110 1 s1 „i` <1 VVater Pipeline Alignment:.40:2439.-104 9140 PLATTEVILLE Water Pipelinre-t �Alignment: 40.2047.-104.9094 r Natter, Pipeline Alignment: 40.1937,-104.9046 Water Pipeline Alignment: 40.1797,-1049041 'i Water Pipeline .A Iignment:.40.1669,-109.9036 \, Water Pipeline �li Aig�nnment: 40.1406,-104.9042 Water Pi Pipeline Alignment:40.1264, -104 9054 ilb\ILliCeil Gi,a� 81 Water Pipeline Alignment: 40:1123, -104.9052 a � 1 u Water•Pipelfne alignment .0987,-104.90118 cy .,_, 11 e MRT WPTON Water Pipeline/Alignment: .0847,-104.9049 ti Weter Pipeline Alignment:.40.0708,-104.9053 Water Iine-Alignment:•40.0567,-104.9046 IL4 GR WbterrPipeline Alllignl mearnt: 40.0434,-104.9062d __ Y1 l ,�,,_, • Water t PPipeline Alignment: 40.0304,-104.9048 Th/vP Ail gnment —• County Boundary Railroad Rwer/Stream/Canal/Ditch 1 Lake/Reservoir Pump Station *2 40 0013,-104 9041 (l ci BRIGHTON LOCHBU1 HUDSON Figure 1 Emergency Action Plan Thornton Water Project Alignment *Information provided in this Plan is intended to meet Section 23-2-510 C.2.g of the Weld County Code and the USR Procedural Guide only. It is not intended to be used in an emergency. Thornton understands that Weld County approval of a Final Thornton Water Project Emergency Incident Action Plan will be required before operation of the Thornton Water Project. 3 DRAFT Thornton Water Project Emergency Incident Action Plan. 15, May 2020 Ambulance Service Area Day 911 Night 911 * Ambulance services correspond with fire districts. See fire district table above for location areas. Fire District Ambulance Service Nunn Fire Protection District Ault -Pierce Fire Department Poudre Fire Authority, Windsor Severance Fire Rescue, and Front Range Fire Rescue Authority University of Colorado Health (UCHealth) Platteville-Gilcrest Fire Protection District Platteville-Gilcrest Fire Protection District Mountain View Fire Rescue Mountain View Fire Rescue Frederick -Firestone Fire Protection District Frederick -Firestone Fire Protection District Fort Lupton Fire Protection District Fire Station 1 Banner Health Ambulance Service Fort Lupton Fire Protection District Fire Station 2 Fort Lupton Fire Protection District Fire Station 2 Brighton Fire Rescue District Platte Valley Ambulance Weld County Regional Communications Center 911 4. Agency Notification Non -Emergency: Fire Department/District: 911 Location Fire Protection District Phone From WCR 92 to WCR 90 Nunn Fire Protection District 970-897-2329 From WCR 90 to WCR 86 Ault -Pierce Fire Department 970-834-2848 From WCR 86 WCR 78 Poudre Fire Authority 970-416-2892 From WCR 78 to 0.50 miles south of State Highway 34 Windsor Severance Fire Rescue 970-686-2626 From 0.50 miles south of State Highway 34 to WCR 36 Front Range Fire Rescue 970-587-4464 WCR 36 to 0.28 miles south of WCR 34; from 0.55 miles north of State Highway 66 to WCR 26 Platteville-Gilcrest Fire Protection District 970-785-2232 "Information provided in this Plan is intended to meet Section 23-2-510 C.2.g of the Weld County Code and the USR Procedural Guide only. It is not intended to be used in an emergency. Thornton understands that Weld County approval of a Final Thornton Water Project Emergency Incident Action Plan will be required before operation of the Thornton Water Project. 4 DRAFT Thornton Water Project Emergency Incident Action Plan. 15, May 2020 Location Fire Protection District Phone 0.28 miles south of WCR 34 to 0.55 miles north of State Highway 66; from WCR 24 to WCR 22; west of WCR 17 from WCR 14 WCR 6 Mountain View Fire Rescue 303-772-0710 From WCR 26 to WCR 24; from WCR 20 to 0.04 miles south of WCR 16; from 0.05 miles south of WCR 16 to WCR 14 Frederick -Firestone Fire Protection District 303-833-2742 From WCR 22 to 0.20 miles north of WCR 20; from 0.04 miles south of WCR 16 to 0.50 miles south of WCR 16; east of WCR 17 from WCR 14 WCR 6 Fort Lupton Fire Protection District 970-350-9600 From WCR 6 to WCR 2 Brighton Fire Rescue District 303-288-1535 Ambulance Service Area: Fire District Ambulance Service Phone Nunn Fire Protection District Ault -Pierce Fire Department Poudre Fire Authority, Windsor Severance Fire Rescue, and Front Range Fire Rescue Authority University of Colorado Health (UCHealth) 844-867-4590 Platteville-Gilcrest Fire Protection District Platteville-Gilcrest Fire Protection District 970-785-2232 Mountain View Fire Rescue Mountain View Fire Rescue 303-772-0710 Frederick -Firestone Fire Protection District Frederick -Firestone Fire Protection District 303-833-2742 Fort Lupton Fire Protection District Fire Station 1 Banner Health Ambulance Service 970-350-9600 Fort Lupton Fire Protection District Fire Station 2 Fort Lupton Fire Protection District Fire Station 2 970-350-9600 Brighton Fire Rescue District Platte Valley Ambulance Service 720-685-8420 "Information provided in this Plan is intended to meet Section 23-2-510 C.2.g of the Weld County Code and the USR Procedural Guide only. It is not intended to be used in an emergency. Thornton understands that Weld County approval of a Final Thornton Water Project Emergency Incident Action Plan will be required before operation of the Thornton Water Project. 5 DRAFT Thornton Water Project Emergency Incident Action Plan. 15, May 2020 Law Enforcement Agency: Weld County Sheriff's Office: Communication Center: Office of Emergency Management: 5. Surrounding Occupancies & Land Use Varies along the water pipeline route. Land use is agricultural. 970-356-4015 970-350-9600 970-304-6540 6. Personal Protective Equipment Available: Location TBD before operation of the Thornton Water Project Thornton's on -call contractors will provide personal protective equipment for their employees. Equipment includes: Hard hats 7. Location of Emergency Equipment & Supplies: Phone# TBD before operation of the Thornton Water Project. Thornton's on -call contractors have equipment available for emergency repairs. List of 2025 on -call contractors are as follows: 8. Action Items and Response: Thornton owns and operates an extensive network of water pipelines that deliver raw and finished water to Thornton facilities and customers in residential and business areas. Providing reliable water requires that Thornton have quick access to parts and equipment to maintain or repair pipelines and related facilities, and the same will apply to the TWP. The TWP pump stations will include emergency automatic shutdown control. Pump stations will undergo automatic controlled shutdown if a sudden pressure drop or increase occurs or sudden changes in water tank levels occur that indicate a water pipeline break, valve closure, or blockage. "Information provided in this Plan is intended to meet Section 23-2-510 C.2.g of the Weld County Code and the USR Procedural Guide only. It is not intended to be used in an emergency. Thornton understands that Weld County approval of a Final Thornton Water Project Emergency Incident Action Plan will be required before operation of the Thornton Water Project. 6 DRAFT Thornton Water Project Emergency Incident Action Plan. 15, May 2020 Pipeline markers will be installed in the pipeline permanent easement to indicate that a water pipeline is buried nearby. The markers will identify the water pipeline, Thornton as the pipeline operator, the operator's 24 -hour emergency contact number, and the area's utility notification number. Marking tape indicating that a water pipeline is buried in the location will also be installed above the water pipeline for the entire length of the water pipeline. The operator at Thornton's Wes Brown Water Treatment Plant will be the emergency point of contact. The Wes Brown Water Treatment Plant is manned 24 hours a day, 7 days a week, 365 days a year and the telemetry for the TWP will be monitored at this location. The operator will be trained, qualified in day to day operation of the water pipeline and associated facilities, and in emergency response procedures. Administration of system shutdown will be feasible from the Wes Brown Water Treatment Plant and at the TWP pump stations. The operator will be able to monitor the operation of the water pipeline, pump stations, and other infrastructure. Monitoring of key parameters including pressures, flow rates, and water levels will occur. If these parameters, or other critically identified criteria fall outside of pre -determined normal operating allowances, warnings will be raised of potential operational upsets or pending emergency conditions, providing the operator with time to make corrections, if possible, to the system operation to clear the warning. If specified parameters, or critically identified criteria reach pre -determined set points within the system operation, automatic shutdown will occur. Dispatch of trained personnel to the site of the emergency will occur as needed and depending on the nature of the emergency, local emergency responders will be notified. If required, the water pipeline will be drained at blow -off assemblies and system repairs will be made as soon as feasible. Any vegetated areas disturbed during required repairs will be restored. 9. Coordination with First Responder Agencies: EHS representative and first responders met on Date to review emergency plan and tour facility. Facility Manager Date Fire Dept. Official Date Weld County OEM Date "Information provided in this Plan is intended to meet Section 23-2-510 C.2.g of the Weld County Code and the USR Procedural Guide only. It is not intended to be used in an emergency. Thornton understands that Weld County approval of a Final Thornton Water Project Emergency Incident Action Plan will be required before operation of the Thornton Water Project. 7 Section 23 Noise Study, If Applicable This section addresses Procedural Guide Checklist, a noise study, if applicable, and WCC Chapter 14, Article IX Noise, and WCC 23-2-510 C.2.c, and the criteria described in WCC Sections 23-2-480A.3, 23-2-480 A.5, 23-2-490 C, and 23-2-490 E. TWP Construction During construction of the TWP, the TWP will comply with Weld County's then -existing noise level requirements (currently WCC Chapter 14, Article IX Noise). Noise from construction equipment will be of short duration during construction. Noise levels from equipment will be controlled through the use of standard maintenance procedures and the use of appropriate mufflers. Construction hours will typically be from 7:00 a.m. to 7:00 p.m., Monday through Saturday unless otherwise approved by Weld County. Construction may extend beyond these hours on an as -required and case -by -case approved basis. For example, some construction activities may be required to complete uninterruptible tasks, meet an in-service date, or minimize short-term impacts to traffic. TWP Post -Construction Water Pipeline and Water Tank Operation No noises related to the water pipeline and water tank operation are anticipated. Pump Stations Operation Pump Station 1 and Pump Station 2 will be designed and constructed to operate in compliance with the requirements of the WCC, and will include noise abatement equipment and structural design as needed to meet those requirements. A preliminary noise study for both pump stations is provided behind this page and has been developed in accordance with WCCChapter14, Article IX Noise. The study includes the proposed noise producing equipment at each site, along with potential noise abatement equipment and design that can be used to meet code requirements. Actual noise abatement will be determined during final design. TWP USR SUPPLEMENT 2 SECTION 23 NOISE STUDY, IF APPLICABLE 23-1 Wave Acoustics, Noise & V (:ration April 28, 2020 Mr. John Himyak City of Thornton Thornton Water Project Engineer 12450 Washington Street Thornton, Colorado 80241 Re: Thornton Water Project — Noise Study of two Pump Stations Wave #1783 Dear John, We have completed our study of noise from the two new pump stations proposed in Weld County. Pump Station 1 is proposed on the south side of Weld County Road (WCR) 50, between WCR 13 (Colorado Boulevard) and WCR 15 (Telep Avenue). Pump Station 2 is proposed on a site that is at the northeast corner of WCR 2 (E. 168th Avenue) and WCR 17. The pump stations have not been designed in detail yet, so our study is based on the conceptual layout of the sites, including the buildings housing the pumps. Our assessment is based on our experience with similar pump stations and information from equipment manufacturers for the equipment expected to be used at each station. The plan for each pump station includes three back-up power generators to keep the station operating in the event of power loss. Since the generators will only run occasionally, we have predicted noise levels with the generators off (normal operation) and with them running. We have assessed the site with the expectation that the Weld County Industrial sound level limit will be enforced at each pump station's site boundary. In addition, we have evaluated the sound levels at the nearest homes with the intent of limiting sound at the homes to the Weld County Residential limit. Since the pump stations can run 24/7, the lower nighttime sound level limits were used for our evaluation. 1140 W. Littleton Blvd. #420 Littleton, CO 80120 720 -445 -WAVE (9283) www.WaveEngineering.US Mr. John Himyak April 2$, 2020 Page 2 Our assessment shows that the Weld County sound level limits can be met at the site boundaries and at the nearest homes. Mitigation measures will be required to meet the Weld County limits, and the anticipated mitigation measures are outlined in this report. Weld County Noise Regulation The Weld County Code, Chapter 14, Article IX sets maximum permissible noise levels for daytime and nighttime hours. We are using the nighttime limits for this study since the pump station will run 24/7. The nighttime limit (from 9:00 p.m. to 7:00 a.m.) for "Industrial or Construction Activities" is 75 dBA. The nighttime limit transmitted to "Residential Property or Commercial Area", and also "Nonspecified Areas" is 50 dBA. The properties surrounding both pump station sites are zoned Agricultural (A) with one exception. The property to the south of Pump Station 2 (south of WCR 2) is in Adams County and is zoned Residential. Section 14-9-20 of the code provides the following definitions of Industrial and Residential land uses. "Industrial Area means an area where manufacturing processing or fabrication of any commodity, storage and warehousing, wholesale sales of equipment, materials and supplies, repair, servicing and rental of vehicles and other commodities and other similar activities are conducted." "Residential Property means any property which is occupied by a residence including single-family or multi family dwellings and apartments, and is located in a platted major residential subdivision, planned unit development or minor subdivision, or is located in the R, R-1, R-2, E, E-1, M or M-1 Zone District..." Wave Engineering has predicted pump station noise levels and compared them to both the Industrial limit (at the pump station site boundaries) and the Residential limit (at the nearest homes in the Agricultural zones). Predicted Sound Levels from Pump Station Operations Wave Engineering used Datakustik CadnaA noise prediction software to calculate noise levels from the two proposed pump stations. The software takes into account sound that radiates from each noise source, the effect of the terrain, buildings, berms, walls, and atmospheric conditions. The calculations are done according to the methodology of ISO Standard 9613-2: Acoustics — Attenuation of sound during propagation outdoors, Part 2: General method of calculation. This 1100 W. Littleton Blvd. #420 Littleton, CO 80120 720 -446 -WAVE (9283) www.WaveEngineering.US Mr. John Himyak April 2$, 2020 Page 3 is an international standard for predicting noise transmission outdoors. The calculations assume downwind conditions in all directions. This is not possible in reality but gives more of worst -case prediction at each receiver point. Pump Station 1- WCR 50, between WCR 13 and WCR 15 The following noise producing equipment was evaluated for Pump Station 1. • (5) 1,250 HP pumps, inside pump building. (4) duty plus (1) standby. Design basis Flowserve 25EKM pumps. • Ventilation and exhaust fans to ventilate the pump building, located inside building. Air enters and exits the building through multiple louvers. • (2) 25 -ton condensing units for conditioning pump building. Located on ground outside pump building • (3) 2 MW backup power diesel generators running simultaneously at 100% load, outside pump building. Design basis Caterpillar 3516C. Noise mitigation measures are necessary to meet the Weld County Industrial limits at the site boundary and the Residential limits at the nearest homes. Figures 1 and 2 below show the predicted sound levels after mitigation measures are included in the design. Figure 1 shows the noise contours with all pump station equipment, except for the generators, running at full load. Figure 2 shows the noise contours with all pump station equipment, including the three generators, running at full load. The following mitigation measures have been included in the noise model and the results shown in Figures 1 and 2. The loudest noise from the pump station is from the gensets. The gensets must be specified with sound attenuating enclosures/muffler to reduce total noise (mechanical and exhaust and radiator combined) to 65 dBA at 50 feet in all directions. This will likely require a Critical Grade muffler with —30 dBA nominal attenuation, and attenuation on the radiator discharge and air intake. Attenuating the radiator discharge and air intakes typically requires sound attenuators or acoustical louvers built into the enclosure. While most of the sound mitigation will be provided by the genset enclosures and mufflers, a screen wall will further reduce by several decibels and is included in the noise model. The screen wall could be masonry, metal, or wood, and must be about two feet taller than the top of the genset/muffler, which will likely be approximately 12' tall. 1100 W. Littleton Blvd. #420 Littleton, CO 80120 720 -446 -WAVE (9283) www.WaveEngineering.US Mr. John Himyak April 2$, 2020 Page 4 The ventilation intake and discharge openings will require internally lined ductwork, elbows, and/or inline duct silencers to attenuate noise from the fans and to mitigate the transmission of pump noise through the louvers. Prop fans in the exterior wall will likely not be acceptable. A steel building with a standing -seam metal roof is too lightweight and will not sufficiently attenuate noise. At a minimum, walls should be stud construction with wood or metal siding on the outside, insulation in the stud cavity, and gypsum board or sheathing on the inside. Masonry wall construction is also acceptable. An example of an acceptable roof is standing seam metal on plywood sheathing on rigid insulation, on metal deck. If overhead garage doors are used in the building, they should be on the west side of the building if possible (away from the residence to the east) or buffered from the pump room with interior walls and doors. 1100 W. Littleton Blvd. #420 Littleton, CO 80120 720 -446 -WAVE (9283) www.WaveEngineering.US Mr. John H imyak April 28, 2020 Page 5 r Te`tnob .ns. U.^. +?ecitctKa =ur':e U30!' "arm St CC Axtx M.^ 004 IV GENSETS r 1ect noti ts, SITE BOUNDARY ;. . U.3 GeA,gr..al Survey L 33A I RESIDENCE Figure 1: Pump Station 1 Noise Contours• — Normal Operation with Gensets of f LEGEND 45 dBA 50 dBA 55 dBA 60 dBA i 65 dBA 70 dBA 75 dBA The noise contours in Figure 1 show that the noise level is well below the Industrial limit of 75 dBA (Purple contour) at the site boundary. The noise level is approximately 55 dBA at the loudest point on the boundary. The noise level is below the Residential limit of 50 dBA (Yellow contour) at the nearest residence. ■ 1100 W. Littleton Blvd. #420 Littleton, CO 80120 720 -446 -WAVE (9283) www.WaveEngineering.US Mr. John Himyak April 28, 2020 Page 6 re - • ...•. - +tr.er-....rsnes! -1 O • ' 1f 113: r •rm 3ervice BITE BOUNDARY RESIDENCE RESIDENCE ask 1. IZC Macs Tonidopa . U LEGEND 45 dBA 50 dBA 55 dBA 60 dBA 65 dBA i _ 70 dBA 75 dBA Figure 2: Pump Station 1 Noise Contours with Three CJensets Running The noise contours project further out from the station with the gensets running, but the noise level is still well below 75 dBA (Purple contour) at the site boundary. The noise level is also below 50 dBA (Yellow contour) at the nearest residence. ■ 1100 W. Littleton Blvd. #420 Littleton, CO 80120 720 -446 -WAVE (9283) www.WaveEngineering.US Mr. John Himyak April 2$, 2020 Page 7 Pump Station 2 - WCR 2 and WCR 17 The following noise producing equipment was evaluated for Pump Station 2. • (5) 125 HP pumps, inside pump building. Design basis Flowserve 17 SPL pumps. • (2) 2,000 HP pumps, inside pump building. Design basis Flowserve 35 ELH pumps. • (3) 125 HP pumps, inside pump building. (2) duty plus (1) standby. Design basis Flowserve 34 EKL pumps. • Ventilation and exhaust fans to ventilate the pump building, located inside building. Air enters and exits the building through multiple louvers • (2) 25 -ton condensing units for conditioning pump building. Located on ground outside pump building • (3) 2 MW backup power diesel generators running simultaneously at 100% load, outside pump building. Design basis Caterpillar 3516C Noise mitigation measures are necessary to meet the Weld County Industrial limits at the site boundary and the Residential limits at the nearest homes. Figures 3 and 4 below show the predicted sound levels after mitigation measures are included in the design. Figure 3 shows the noise contours with all pump station equipment, except for the generators, running at full load. Figure 4 shows the noise contours with all pump station equipment, including the three generators, running at full load. The following mitigation measures have been included in the noise model and the results shown in Figures 3 and 4. Similar to Pump Station 1, the loudest noise from the pump station is from the gensets. The gensets must be specified with sound attenuating enclosures/mufflers to reduce total noise (mechanical and exhaust and radiator combined) to 65 dBA at 50 feet in all directions. This will likely require a Critical Grade muffler with —30 dBA nominal attenuation and attenuation on the radiator discharge and air intake. Attenuating the radiator discharge and air intakes typically requires sound attenuators or acoustical louvers built into the enclosure. While most of the genset sound mitigation will be provided by the genset enclosures and mufflers, a screen wall will further reduce by several decibels and is included in the noise model. The screen wall could be masonry, metal, or wood, and must be about two feet taller than the top of the genset/muffler, which will likely be approximately 12' tall. The ventilation intake and discharge openings will require internally lined ductwork, elbows, and or duct silencers to attenuate noise from the fans and to mitigate sound transmission from the pumps. Prop fans in the exterior wall will likely not be acceptable. 1100 W. Littleton Blvd. #420 Littleton, CO 80120 720 -446 -WAVE (9283) www.WaveEngineering.US Mr. John Himyak April 2$, 2020 Page $ As with Pump Station 1, a steel building with a standing -seam metal roof is too lightweight and will not sufficiently attenuate noise. At a minimum, walls should be stud construction with wood or metal siding on the outside, insulation in the stud cavity, and gypsum board or sheathing on the inside. Masonry wall construction is also acceptable. An example of an acceptable roof is standing seam metal on plywood sheathing on rigid insulation, on metal deck. If overhead garage doors are used, they should be on the north or east side of the building if possible (away from the residence to the west), or buffered from the pump room with interior walls and doors. 1100 W. Littleton Blvd. #420 Littleton, CO 80120 720 -446 -WAVE (9283) www.WaveEngineering.US Mr. John Himyak April 28, 2020 Page 9 v r ss r `. -..'�"-�' calf �►s+ J I 1 1 I I . i • , I c . 1 Figure 3: Pump Station 2 Noise Contours — Normal Operation With Gensets ()f f I OJ 0.4 LEGEND 45 dBA 50 dBA 55 dBA 60 dBA 65 dBA i i 70 dBA 75 dBA The noise contours in Figure 3 show that the noise level is well below the Industrial limit of 75 dBA (Purple contour) at the site boundary. The noise level is approximately 59 dBA at the loudest point on the boundary. The noise level is also well below the Residential limit of 50 dBA (Yellow contour) at the nearest residence. ■ 1100 W. Littleton Blvd. #420 Littleton, CO 80120 720 -446 -WAVE (9283) www.WaveEngineering.US Mr. John Himyak April 28, 2020 Page 10 LEGEND 45 dBA 50 dBA 55 dBA 60 dBA 65 dBA i _ i Figure 4: Pump Station 2 Noise Contours with Three Gensets Running 70 dBA 75 dBA The noise contours in Figure 4 show that the noise level is well below the Industrial limit of 75 dBA (Purple contour) at the site boundary. The noise level is also below the Residential limit 50 dBA (Yellow contour) at the nearest residence. ■ 1100 W. Littleton Blvd. #420 Littleton, CO 80120 720 -446 -WAVE (9283) www.WaveEngineering.US Mr. John Himyak April 2$, 2020 Page 11 Summary Wave Engineering has predicted noise levels from equipment at the two pump stations proposed in Weld County. The pump stations have not yet been designed in detail, so sound levels for the expected equipment were determined from similar projects and equipment manufacturers. A computer noise prediction model was developed for each pump station. With no mitigation, the pump station noise levels would exceed the Weld County Industrial and Residential limits. We have outlined noise mitigation measures. These measures, or equivalent measures, are required to meet the Industrial noise limit at the site boundaries and the Residential limit at the nearest residences. The resulting noise levels for normal pump station operation are shown in Figures 1 and 3. The noise levels when the emergency generators are also running at full load are shown in Figures 2 and 4. This study shows that if the mitigation measures outlined above are implemented, the pumps station noise levels will meet the Weld County limits during normal operation and when the emergency generators are running. Please let me know if you have any questions. Sincerely, Digitally signed by Jeff Kwolkoski DN: E=JeffK@WaveEngineering.co, Jeff Kwolkoski O="Wave Engineering, Inc.", CN=Jeff Kwolkoski Jeff Kwolkoski, P.E., INCE Bd. Cert. President 1100 W. Littleton Blvd. #420 Littleton, CO 80120 720 -446 -WAVE (9283) www.WaveEngineering.US Section 24 Soils Report This section addresses the permit application requirements described in Procedural Guide Checklist, soils report and WCC Sections 23-2-510 C.2.c and 23-2-510 C.2.m the criteria described in WCC Sections 23-2-480 A.3, 23-2-480 A.5, 23-2-490 C, and 23-2-490 E. On February 6, 2020, Weld County staff stated that a Natural Resource Conservation Service (NRCS) soils report is not applicable to the TWP and that providing information similar to what was provided in the December 21, 2018 Application would meet the USR application requirements. A summary of that discussion is included in section USR Procedural Guide Checklist. Nevertheless, to be responsive to other WCC requirements, NRCS reports are included in Appendix D in addition to the information that was included in the December 21, 2018 Application as presented in this section. Soils Reports Atotal of six NRCS soil reports were prepared using the Web Soil Survey (WSS) application (https://websoilsurvey.sc.egov.usda.gov/App/WebSoilSurvey.aspx). The items addressed by these reports include three segments of the water pipeline (B and C - South, C - North, E), the water tank, and two pump stations. The water pipeline was addressed using three reports (segments) instead of a single report due to limitations associated with defining areas of interest for reports in the WSS application. The three water pipeline reports that were provided in Supplement 1 (original reports) are replaced with new reports in this Supplement 2 to reflect the minor water pipeline alignment changes. A comparison of the Suitabilities and Limitations for Use sections in the original and new reports were conducted and the minor revisions to the water pipeline alignment did not result in any changes to the NRCS ratings. The reports for the water tank and two pump stations did not change. Reports are included in Appendix D. NRCS terminology for conditions formerly described as having "moderate or severe limitations" are now described as "very limited". Table 24.1 presents reasons for very limited ratings and associated mitigations proposed by a professional engineer licensed in the State of Colorado. TABLE 24.1 Summary of Very Limited Rating from the TWP NRCS Soil Reports Item Description (Area of Interest*) Percent of Area of Interest* Rated as "Very Limited" Primary Reasons) for Potential Mitigations Rating Water Pipeline Combined limit of permanent and temporary easements; 475 acres Water Tank 1.5 acres Pump Station 1 5 acres 9 Depth to saturated zone, flooding and unstable excavation walls; slope; depth to soft bedrock 0 Not applicable 18 Slope Trenchless construction methods, dewatering and shoring; regrading; use of heavy-duty excavation equipment Not applicable Re -grading of site TWP USR SUPPLEMENT 2 SECTION 24 SOWS REPORT 24-1 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE 24.1 Summary of Very Limited Rating from the TWP NRCS Soil Reports Item Description Percent of Area of Primary Reasons) for Potential Mitigations (Area of Interest* Rated as Rating Interest*) "Very Limited" Pump Station 2 9 acres 100 Shrink/swell soils Over -excavation, moisture conditioning and re -compaction of existing soils, replacement of existing soils or use of deep foundations. *Areas of interest may not be equal to areas of disturbance, but ratings could be used as an indicator for soil limitations in areas of disturbance. Figure 24.1a and Figure 24.1b show soil types per the NRCS, Soil Survey Geographic database, 2019. A subsurface geotechnical investigation of geologic conditions utilizing soil and rock borings will be completed during design to further determine the subsurface soil conditions and associated geological hazards for the TWP. Mitigation measures will be further refined during design to meet site -specific geological hazards and BMPs will be implemented under the SWMP to minimize or mitigate soil erosion. Geologic Hazards A desktop review was conducted to identify the potential for geologic hazards along the TWP. Colorado Geological Survey publishes information about geologic hazards such as abandoned mine lands, avalanches, collapsible soils, corrosive soils, debris flows/mudslides, earthquakes, subsidence, heaving bedrock, landslides, rockfall, and swelling soils. Available maps were reviewed for indications of known geologic hazards. In addition, Weld County's GIS Digital Database, which includes identified geological hazards, was evaluated during the review, with information shown in Figure 24.2a and Figure 24.2b. Based on the desktop review, the majority of the TWP has no identified geologic hazards and the hazards identified are not considered "active". Weld County's GIS Data shows two inactive faults along the water pipeline alignment. Based upon mapping conducted by the Colorado Geological Survey (Colorado Earthquake Hazards Mitigation Council, 2013), the mapped faults identified in Weld County's GIS Data are not identified as quaternary faults (i.e. faults which have been active in the past 1.8 million years) and as such are generally not considered "active". Due to the inactivity of the faults and the lack of recorded earthquakes in the area, the risk of shallow earthquakes and ground movements is considered low. Construction risks therefore are limited to poor rock conditions (i.e. fault breccia and gouge), spatially rapid changes in ground conditions across fault zones, and the potential for perched water conditions. Potential mitigation measures in this area include: + Limiting the vertical alignment of the water pipeline to the surficial soils, where sufficient cover exists. • Open -cut construction methods. + Additional dewatering capacity in the case of rapid increases of water inflows. TWP USR SUPPLEMENT 2 SECTION 24 SOILS REPORT 24-2 Thornton Water Project Si ire! SiypVISPRZIly St Sraiage Reservtiii \'a .1 AGrve►�Reservoir teaterStpply� Sronge Resayriii 4 3 ie etS VINE DR ri CHERRY ST LAPORTE AVE ' ' MOUNTAIN AVE ekes itagavesrie -- tiler taro • DOUGLAS RD cc } U Ricks d Lahe c w. -: C im=--:.:RICHARDS LAKE RD If o_°C •Lon 'Pond N Li WILLOX LN w " m • MOUNTAIN VISTA OR ) lardesuneter Fre rn ',•Z tn O •a O •• g I r1 BUCKINGHAM S GOLN AVE VULBERRY STe • N • : L. . i.. LAUREL ST (- ELIZABETH ' '0 •z :: �Q ST -- :-:PITKJIy g1' � ; dla STUART ST di .. 7 STUART ST g yt , -1.3 FORT COLUMe,A ao Z COLLINS J . 0Dtil a iPtw ..:• W > b a T VINE DR • CENT DRAKE RD SWALLOW. •w .• if TROUT -MAN PKryl, HARMONY -RD HORSETOOTH RD-. t J U2 ._;>' t= TiCONOE "DR PROSPECT RD • U = Ui w N STETSONC aE • - O -TRILBY RD 2 ._ Soils Crossed by TWP: Aquolls and Aquents, gravelly substratum Aquolls and Aquepts, flooded Ascalon fine sandy loam, 0 to 6 percent slopes 71ST ST Ascalon sandy loam, 0 to 3 percent slopes Cascajo gravelly sandy loam, 5 to 20 percent slopes Ci-2 Colby loam, 1 to 3 percent slopes Colby loam, 5 to 9 percent slopes Fort Collins loam. 0 to 3 percent slopes 93 Kim loam, 0 to 1 percent slopes a:3 Kim loam, 1 to 3 percent slopes ( 3 Kim loam, 3 to 5 percent slopes Kim loam, 5 to 9 percent slopes Nelson fine sandy loam, 3 to 9 percent slopes j Nunn clay loam, 0 to 1 percent slopes 03 Nunn clay loam, 1 to 3 percent slopes 3 Nunn loam, 1 to 3 percent slopes Q Ofney fine sandy loam, 1 to 3 percent slopes Olney fine sandy loam. 3 to 5 percent slopes 03 c --k C3 C3 C3 Jul `-3 r3 Otero sandy loam, 1 to 3 percent slopes Otero sandy loam, 3 to 5 percent slopes Otero sandy loam, 3 to 9 percent slopes Otero sandy loam, 5 to 9 percent slopes Tassel fine sandy loam, 5 to 20 percent slopes Terry sandy loam. 3 to 9 percent slopes Thedalund loam, 0 to 3 percent slopes Thedalund loam. 1 to 3 percent slopes Thedalund-Keota loams, 3 to 9 percent slopes Weld loam, 1 to 3 percent slopes Wiley -Colby complex. 1 to 3 percent slopes Wiley -Colby complex, 3 to 5 percent slopes Thornton CITY OF THORNTON COLORADO 0 S 0.875 Fond Cnek Railroad 1.75 CR56 .Grath Grab Hetervozr �J J CR48 r - I Cobb Lake IlanAler Lake I • • n14 r Rued! 1 ate •- -- rY CROSSROADS BD CR 18 CR',r .. •a • • 1 JOHNSTOWN Water Tank CR 74 4TH AVE Ca in a- -tit, CR 72 N I (257 Windsor lake INDSOR •'l11 i s� CR 62 CROSSROADS BD *Itp, CC TWP in Unincorporated Weld County TWP outside Unincorporated Weld County -- County Boundary Railroad Lake/Reservoir Pump Station 1 I CHARLOTTE'ST r.. cc U r cc s_ Loop tike Rer ar 111 4TH AVE SEVERANCE EASTMAN PARK DR Great Western Railroad CR 90 1 biasklir Lake 392 i CR 64:75 U ST OR CR 6450 CR 64.5 U cc U Great gitstern CR64 GREELEY 37TH sr -MILLIKEN 4TH ST EVANS Figure 24.1a Soils 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/22/2021 1 inch = 1.75 miles Miles W went THORNTON_NORTHERN_PROJECT\TASK_ORDER 5* I_PE RWTTW,Cvr3rSVAAPF1LESMIELD_USR%RESOURCEMAPS PERMITAPP 2021 SOILS MW AUAN 1/22/2021 11 30 34 AM Sources NRC$ NHD. CDWR. Weis County. COOT Thornton Water Project 5TH AVE r-� Highland I akr \% Soils Crossed by TWP: CR 44 rr BERTHOUD Reservoir l., BELLA ROSA PYJWCR 20 Altvan loam. 0 to 1 percent slopes Aquols and Aquents. gravelly substratum Aquols and Aquepts, flooded Bankard sandy loam, 0 to 3 percent slopes. frequently flooded Heldt silty clay. 1 to 3 percent slopes Kim loam, 1 to 3 percent slopes Kim loam. 3 to 5 percent slopes Kim loam. 5 to 9 percent slopes Nunn clay loam, 0 to 1 percent slopes Nunn clay loam, 1 to 3 percent slopes Nunn loam. 0 to 1 percent slopes Nunn loam. 1 to 3 percent slopes Olney fine sandy loam. 1 to 3 percent slopes Olney fine sandy loam. 3 to 5 percent slopes Olney loamy sand, 1 to 3 percent slopes Renohill clay loam, 3 to 9 percent slopes Tassel fine sandy loam. 5 to 20 percent slopes Thedalund loam, 1 to 3 percent slopes Thedalund loam. 3 to 9 percent slopes Ulm clay loam. 3 to 5 percent slopes Valent sand, 3 to 9 percent slopes Vona loamy sand. 0 to 3 percent slopes Vona loamy sand. 3 to 5 percent slopes Vona sandy loam, 1 to 3 percent slopes Vona sandy loam. 3 to 5 percent slopes Weld loam. 0 to 1 percent slopes Weld loam, 1 to 3 percent slopes Wiley -Colby complex. 0 to 1 percent slopes Wiley -Colby complex. 1 to 3 percent slopes Wiley -Colby complex, 3 to 5 percent slopes ('Thornton aA1Ls: PFC..L CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/22/2021 0 1.75 1 inch = 1.75 miles Miles te CR 20 CC JOHNSTOWN cc .v'; FIRESTONE B FIRESTONE] CR * BUCHANAN •--t N N AVE 1"4.72 Q CR 16 . z 1ST 5CFn LATH �0��, Uc ;/ 8TH ST 22 p VI & > ?w et O O 3 W_ W it zx.a m_ _ ,W �,jj =cc 0 � ) l U )ACONO sel fpm ORTHGLENN Lai • 168TH AVE ... •• -O I- t CC • Y • a 0 t Pump Station 2 •.S•. A • J TWP in Unincorporated 11 Weld County TWP outside Unincorporated Weld County —• County Boundary Railroad Lake/Reservoir I.1. O W 257 - E! ST MILLIKEN CR-24 CR 32 50 .Sand Hill Lafie CR S116 CO VE t CR 18 o, - .1/ m. la MOVI 5T• 1 , Q 6TH 'ST --. z 4TH ST zu,0 3RO$T t i a W cr, Al? N CC U Weld County THA„ E /17 trt Adams Count)), 9 ai 0 O _ W • 0 i U CR 44 a: U CR 32 t CR CR 16 cm 4- rel U EVANS n >3 w J FORT LUPTON BASELINE RD ••.1•11••.121=1=111S. CR 8 4 52 LOCHBUIE 9 BRIDGE ST I Figure 24.1b Soils rat: NRCS, NHD. CDWR- Web Casnc. COOT W 478988 THORNTON NORTHERN PROJECTITASK ORDER Sly 1 PERMITTINGCGlSWAPF;ESWYELD USRIRESOURCE MAPSIPERMITAPP 20211SOILSMXO JQUAN1 /2212021 '13034 AM Thornton Water Project Thornton CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/22/2021 0 S 0.875 1.75 1 inch = 1 75 miles Miles TWP in Unincorporated Weld County TWP outside Unincorporated Weld County —• County Boundary Railroad River/Strearn/ Canal/Ditch Lake/Reservoir Fault Line Mine Extent Depth of Cover above Abandoned Coal Mines 10-49 50 - 99 100 - 149 150 - 199 200 - 249 Figure 24.2a 250 - 299 Geologic Hazards MS 300 - 349 350 - 399 400 - 9999 Sources %HD COWR WtoCo,.rty CDC" Wt4789M_THORNTON_NORTHERN_PROJECT\TASK_ORDER_5L51_PERMITTINMGISWIAPFILESIWELD USRIRESOURCE_MAPSPERMITAPP-20211GEOLOGIC_HAZARDSMXD JOUAN'/72/2O21104002 AM Thornton Water Project LAEA.YE.T.TE =S.:.t- (IL AGO ��yc, DR . g, :,i-<7. Stn?4t' Thornton YWATER PRC)JEC:' CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241.2405 1/22/2021 rdisparage : cs 160TH AVE 0 S 0.875 r • 1.15 1 inch = 1.75 miles Miles TWP in Unincorporated Weld County TWP outside Unincorporated 8688 Weld County —• County Boundary Railroad River/Stream/ Canal/Ditch Lake/Reservoir Fault Line 0 Mine Extent Depth of Cover above Abandoned Coal Mines I-10 - 49 50-99 100 - 149 150 - 199 BUSFIST , • rBRIDGE ST". -7' � p ; 200-249 Figure 24.2b °I"rA 250 - 299 Geologic Hazards IIII 300 - 349 350 - 399 400 - 9999 Sources: NHD. CDWR- Viva Cou" CDO T W'478988 THORNTON NORTHERN PROJECT\TASK ORDER SIS 1 PERMITTNGIGISWAPFIlESiWELD USR\RESOURCE MAPS\PERMITAPP 20211GEOLOGIC HAZARDS MXD JQUAN 112212021 10-40:02AM THORNTON WATER PROJECT WELD COUNTY USR SUPPLEMENTAL PERMIT APPLICATION Weld County's GIS Data does not show abandoned coal mines along the water pipeline alignment. The water pipeline crosses the historical Boulder -Weld coal field with abandoned mine workings identified at a range of depths, with subsidence features having been reported in regions of relatively shallow mining. A review was conducted of USGS Geologic Investigations Series I-2735, Version 1.0 (Roberts, Hynes, and Woodward, 2001) maps showing the extent of mining, locations of mine -shafts, adits, air shafts, and bedrock faults, and thickness of overburden above abandoned coal mines in the Boulder -Weld coal field, Boulder, Weld, and Adams Counties. The maps do not indicate undermined areas along the water pipeline alignment. The Colorado Landslide Inventory Map Viewer, (Colorado Geological Survey) was evaluated to view records regarding landslides in Colorado. The viewer contains polygon records of landslides and unstable slope areas digitized from multiple sources and multiple scales by the Colorado Geologic Survey. The viewer does not indicate records of landslides nor unstable slope areas along the water pipeline alignment. In areas with sandy soils and increased sloughing, potential mitigation measures may include, but are not limited to, the following: • Revegetation + Soil erosion blankets during construction • Trenchless construction methods A subsurface geotechnical investigation of geologic conditions utilizing soil and rock borings will be completed during design of the TWP to further determine the subsurface soil conditions and associated geological hazards. Mitigation measures will be further refined during design to meet site -specific geological hazards. TWP USR SUPPLEMENT 2 SECTION 24 SOWS REPORT 24-7 Section 25 Community Meeting (Optional) This section addresses Procedural Guide Checklist, community meeting (optional) and WCC Sections 23-2-470 B.4 and 23-2-510 C.2.e. Public Outreach Public outreach includes Open Houses, a TWP website, TWP e-mail address, and TWP phone line, and stakeholder outreach. See Appendix E for additional information on public outreach and Appendix B for additional information on stakeholder outreach. Open Houses Public outreach is not required by Weld County's USR permit application process. However, to introduce the public and potentially affected property owners to the TWP, respond to questions, and to collect input from the public and potentially affected property owners, the following Open Houses were held in Larimer and Weld Counties: • November 14, 2016 at Southwest Weld Services Complex, 4209 Weld County Road 24 %2, Longmont + November 16, 2016 at Poudre Valley REA, 7649 REA Parkway, Fort Collins • December 6, 2016 at Larimer County Courthouse, 200 West Oak Street, Fort Collins + December 8, 2016 at Johnstown Senior Center, 101 Charlotte Street, Johnstown Atotal of 1,270 invitations to the Open Houses were sent to Weld County and Larimer County property owners within the initial proposed corridor and within Weld and Larimer County's major land use permit notification areas. Of the invitations sent, a total of 423 Weld County property owners within the initial proposed corridor and within 150 feet of the initial proposed corridor were mailed invitations analogous to WCC Section 23-2-470 B.5, notice of application to surrounding property owners within 150 feet. Invitations were also sent to local municipality representatives. After the first two Open House events, a second invitation was sent to remind invitees that two Open Houses were still forthcoming. A total of 146 attendees signed in and provided addresses at one or more of the four Open Houses. Copies of sign -in sheets obtained at the open houses with personal information redacted, to protect privacy, are included in Appendix E. Display boards and maps that included information on the following topics were exhibited at the Open Houses: • Overview + Purpose and Need • History • Timeline + Permitting • Land Acquisition • Construction + Corridor Maps Frequently asked questions and land acquisition brochures were available. Open House attendees were offered comment forms to provide feedback regarding route alternatives, project concerns TWP USR SUPPLEMENT 2 SECTION 25 COMMUNITY MEETING (OPTIONAL) 25-1 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION and suggestions, and general comments. Attendees were given the opportunity to sign up for TWP updates. The majority of attendees were interested in reviewing the initial proposed corridor. Large maps were exhibited by the TWP Team so that attendees could identify where the initial proposed corridor was located in proximity to their property and how the TWP could affect them. It was explained that the final alignment has not yet been developed and that one of the objectives of the Open Houses was to obtain feedback from attendees. Open House documents can be found in Appendix E. TWP Website, TWP E-mail, and TWP Phone Line Public outreach is not required by Weld County's USR permit application process. However, to introduce the public and potentially affected property owners to the TWP, the TWP website, TWP e- mail address, and TWP phone line (www.ThorntonWaterProject.com, info@ThorntonWaterProject.com, and 720-977-6700) launched on October 28, 2016. The website, e-mail, and phone line provide opportunities for questions and the collection of input from the public and potentially affected property owners. Stakeholder Outreach In an effort to determine the alternative corridor least impactful to local communities in Northern Colorado, Thornton, in 2015, conducted a series of outreach meetings with local governments and agencies that could be impacted by the TWP. During the initial outreach meeting with each local government and agency, feedback was collected to determine preference(s) and/or determine potential problems for the location of the water pipeline within the local government or agency's jurisdictional and/or GMA boundaries. For information on the TWP corridor development process, see Appendix F. Secondary outreach meetings were conducted with local governments and agencies that had incorporated areas or GMAs overlapping alternative corridor locations to present the initial three alternative corridors. During this second round of outreach, additional feedback was collected from the local governments and agencies and, as a result, a fourth alternative corridor, was developed as the local government's preferred corridor. Outreach meetings were conducted with the following local governments: + Berthoud • Dacono + Firestone + Fort Collins • Frederick + Greeley • Johnstown • Larimer County + Loveland • Mead + Milliken TWP USR SUPPLEMENT 2 SECTION 25 COMMUNITY MEETING (OPTIONAL) 25-2 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • Timnath • Weld County + Wellington • Windsor Thornton has been in discussions with USACE beginning in 2014 to provide information on the TWP to USACE staff. Thornton will continue consulting with USACE and plans to submit a jurisdictional determination request to USACE before completing design activities to determine which areas in the TWP are jurisdictional waters. Design will include trenchless construction methods at jurisdictional water crossings. Additional outreach and coordination activities included: + Meetings with local major utility providers • Meeting with the CDOT + Meeting with Colorado Parks and Wildlife (CPW) + Meeting with Great Western Railroad • Presenting the TWP at the Energy Industry Working Group (Weld County oil and gas companies) on December 15, 2016 • Sending letters to initiate coordination activities to local irrigation and ditch companies, utility providers, wildlife agency outreach (CPW and U.S. Fish and Wildlife Service [USFWS]), and local fire districts Thornton will continue coordinating with stakeholders and will obtain license agreements and permits as appropriate. Stakeholder outreach information is included in Appendix B. TWP USR SUPPLEMENT 2 SECTION 25 COMMUNITY MEETING (OPTIONAL) 25-3 Section 26 Application Fee This section addresses Procedural Guide Checklist, application fee and WCC Section 23-2-510 F. A check in the amount of $2,500 was remitted to Weld County for the Application on January 2, 2019 and as directed by Weld County Planning staff, electronic payment of $5,000 occurred for Supplemental 1 on May 1, 2020 for the Weld County Planning Fee required for Use by Special Review —All other Use by Special Review permits. TWP USR SUPPLEMENT 2 SECTION 26 APPLICATION FEE 26-1 Section 27 Investigation Fee This section addresses Procedural Guide Checklist, investigation fee. An investigation fee is not applicable to the TWP. On February 6, 2020, Weld County staff stated that an investigation fee is not applicable to this application. A summary of that discussion is included in section USR Procedural Guide Checklist. TWP USR SUPPLEMENT 2 SECTION 27 INVESTIGATION FEE 27-1 Procedural Guide 2021 Procedural Guide 2021 This section addresses a revised Weld County USR Procedural Guide (Procedural Guide 2021) that was downloaded from Weld County's website on January 8, 2021. Supplement 1 was organized to address the January 1, 2020 USR Procedural Guide that is referenced throughout this document as Procedural Guide Checklist. Supplement 1 has been reviewed by Weld County staff, referral agencies, and Weld County Planning Commission. This Supplement 2 is organized in the same order as Supplement 1 pursuant to the Procedural Guide Checklist. Sections 1 through 27 provide required information and in the order listed on the checklist provided in the Procedural Guide Checklist. The Procedural Guide 2021 references the USR permit process applicable to Weld County Code (WCC) Chapter 23, Article II, Division 4 Use by Special Review and not WCC Chapter 23, Article II, Division 6 Use by Special Review Permits for Pipeline — Domestic Water. The TWP falls under the Division 6 permit requirements for Pipeline — Domestic Water. No procedural guide exists for Pipeline — Domestic Water. Accordingly and similar to the Procedural Guide Checklist, not all of the requirements listed in the Procedural Guide 2021 are applicable to this Supplement 2. The purpose of this section is to demonstrate that this Supplement 2 addresses the requirements listed in the Procedural Guide 2021 requirements. The following information shown in red italicized text presents the Procedural Guide 2021 requirement followed by either a reference to where the information is included in this Supplement 2 or information to address the requirement. Planning Requirement Checklist • Application Form. Section 1. + Authorization Form, if applicable. Section 2. • Deed identifying the surface estate ownership interest in the property and relevant Lease documents Section 8. • Articles of Organization or Incorporation documents if the owner is a business entity. Include Statement/Delegation of Authority documentation. Section 3. + Trustee documents if the owner is a Trust. Section 3. • A Certificate of Conveyances (COC) prepared by a Title Company. Once signed, the COC expires within 30 days. Section 9. + A signed Statement of Taxes from the County Treasurer showing no delinquent property taxes for subject property. The Statement shall be from the current tax year. Section 10. TWP USR SUPPLEMENT 2 PROCEDURAL GUIDE 2021 PG2021-1 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • Completed Planning Questionnaire. Section 4. Also see Planning Questionnaire included in this section. • Draft USR map. Section 11 and Second Supplemental Permit Application, Volume 3. + Lighting Plan following the standards set forth in Chapter 23, Article I!, Division 4 and the Dark Sky Policy, if applicable. The TWP falls under the permit requirements for WCC Chapter 23, Article I!, Division 6 Use by Special Review Permits for Pipeline — Domestic Water and this requirement is not applicable. In accordance with the Weld County staff recommended conditions of approval for the TWP, prior to construction, Thornton will submit a statement addressing the lighting that will be used if there is construction on the water pipeline at night and Thornton will submit a lighting plan to and for approval by the Department of Planning Services. • Sign Plan detailing type, size and number of proposed signs with images following the standards set forth in Chapter 23, Article IV, Division 2 and Appendices 23-C through E, if applicable. Section 18. + Landscape Plan and Screening Plan detailing the existing and proposed landscaping, property maintenance, installation schedule, irrigation method, security and/or privacy fencing, trash enclosure, portable toilet screening, etc. if applicable. Section 20. + Soil Report of the site prepared by the Natural Resource Conservation Service or a soils engineer. Section 24 and Appendix D. • Communication or Decommissioning Plan, if applicable. Section 21. + Emergency Contact Form (See attached). The form included in Procedural Guide 2021 is for commercial or industrial buildings and is not applicable to the TWP. • Notice of Inquiry (NO!) Form from a municipality or municipalities if the site is located within an Intergovernmental Agreement (IGA) boundary or a Coordinated Planning Agreement (CPA) boundary, if applicable. Section 12. • Buffer Report, signed, of the names, addresses and parcel numbers of the surrounding property owners within 500 feet of the property. Once signed, the buffer report expires within 30 days. Section 5. The TWP falls under the permit requirements for WCC Chapter 23, Article II, Division 6 Use by Special Review Permits for Pipeline — Domestic Water. Lists of surface property owners are provided within 150 feet of the TWP with names, addresses, and the corresponding parcel identification numbers in accordance with WCC Section 23-2-510 D. • Community meeting sign -in sheet, minutes, and summary (optional). Section 25 and Appendix E. TWP USR SUPPLEMENT 2 PROCEDURAL GUIDE 2021 PG2021-2 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • The names and addresses of any owner, operator of any oil and gas facilities, irrigation ditches/laterals, pipelines, overhead lines, railroad, etc. on the property, if applicable. Section 6. Names and addresses of railroads were not previously required. Names and addresses of railroads crossed by the TWP are as follows: Great Western Railway of Colorado (Omnitrax) C/O AR Real Estate Department 252 Clayton Street, 4th Floor Denver, CO 80206 Union Pacific Railroad Company 1400 Douglas Street Omaha, NE 68179 • A copy of any Surface Use Agreement with mineral owners associated with the subject property, stipulating that the oil and gas activities on the subject property have been adequately incorporated into the design of the site in accordance with Section 23-2-160.Z . Section 7. • Application fee. Section 27. Public Works Requirement Checklist ▪ Completed Public Works Questionnaire. Section 4. Also see Public Works Questionnaire included in this section. • A Preliminary Drainage Report or Drainage Narrative. Section 16 and Second Supplemental Permit Application, Volume 4. + A Traffic Impact Study (or Traffic Narrative). Section 17. + MS4 Requirements, if applicable. The TWP does not fall within any M54 areas within unincorporated Weld County and this requirement is not applicable. Environmental Health Requirements Checklist + Completed Environmental Health Questionnaire. Section 4. Also see Environmental Health Questionnaire included in this section. • Water Supply Documentation. Section 14. + Sewage Disposal Documentation. Section 15. • Noise Study including a noise abatement plan documenting the methods to be utilized to meet the applicable noise standard, as determined by Environmental Health. Section 23. TWP USR SUPPLEMENT 2 PROCEDURAL GUIDE 2021 PG2021-3 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • Waste Handling Plan, as determined by Environmental Health. Section 4. • Dust Abatement Plan, as determined by Environmental Health. Section C.2.c, Air Quality Information. + Engineering, Design and Operations Plan, as determined by Environmental Health. Section 4. • Nuisance Abatement Plan (pest, manure, etc.), as determined by Environmental Health. Section 19. Planning Questionnaire 1. Explain the proposed use and business name. Section 4, Planning Questions P.1.a. 2. Explain the need for the proposed use. Section 4, Planning Questions P.1.c. 3. Describe the current and previous use of the land. Section 4, Planning Questions P.1.b. 4. Describe the proximity of the proposed use to residences. Section 4, Planning Questions P.1.e. 5. Describe the surrounding land uses of the site and how the proposed use is compatible with them. Section 4, Planning Questions P.1.d. 6. Describe the hours and days of operation (i.e. Monday thru Friday 8:00 a.m. to 5:00 p.m.). Section 4, Planning Questions P.1.f. 7. Describe the number of employees including full-time, part-time and contractors. If shift work is proposed, detail number of employees, schedule and duration of shifts. Section 4, Planning Questions P.1.g. 8. Describe the maximum number of users, patrons, members, buyers or other visitors that the site will accommodate at any one time. Section 4, Planning Questions P.1.h. 9. List the types and maximum numbers of animals to be on the site at any one time (for dairies, livestock confinement operations, kennels, etc.). Section 4, Planning Questions P.1.i. 10. List the types and number of operating and processing equipment. Section 4, Planning Questions P.1. 11. List the types, number and uses of the existing and proposed structures. Section 4, Planning Questions P.1.k and Building Questions B.1, B.2, and B.3. 12. Describe the size of any stockpile, storage or waste areas. Section 4, Planning Questions P.1.1. TWP USR SUPPLEMENT 2 PROCEDURAL GUIDE 2021 PG2021-4 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION 13. Describe the method and time schedule of removal or disposal of debris, junk and other wastes associated with the proposed use. Section 4, Planning Questions P.1.m. 14. Include a timetable showing the periods of time required for the construction of the operation. Section 4, Planning Questions P.1.n. 15. Describe the proposed and existing lot surface type and the square footage of each type (i.e. asphalt, gravel, landscaping, dirt, grass, buildings). Section 4, Planning Questions P.1.o. 16. How many parking spaces are proposed? How many handicap -accessible parking spaces are proposed? Section 4, Planning Questions P.1.p. 17. Describe the existing and proposed fencing and screening for the site including all parking and outdoor storage areas. Section 4, Planning Questions P.1.q and P.1.s. 18. Describe the existing and proposed landscaping for the site. Section 4, Planning Questions P.1.r. 19. Describe reclamation procedures to be employed as stages of the operation are phased out or upon cessation of the Use by Special Review activity. Section 4, Planning Questions P.1.t. 20. Describe the proposed fire protection measures. Section 4, Planning Questions P.1.u. 21. Explain how this proposal is consistent with the Weld County Comprehensive Plan per Chapter 22 of the Weld County Code. Section 4, Planning Questions P.2. 22. Explain how this proposal is consistent with the intent of the zone district in which it is located. Section 4, Planning Questions P.3. 23. Explain how this proposal will be compatible with future development of the surrounding area or adopted master plans of affected municipalities. Section 4, Planning Questions P.4. 24. Explain how this proposal impacts the protection of the health, safety and welfare of the inhabitants of the neighborhood and the County. Section 4, Planning Questions P.7 25. Describe any irrigation features. If the proposed use is to be located in the A (Agricultural) Zone District, explain your efforts to conserve prime agricultural land in the locational decision for the proposed use. Section 4, Planning Questions P.6. TWP USR SUPPLEMENT 2 PROCEDURAL GUIDE 2021 PG2021-5 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION 26. Explain how this proposal complies with Article V and Article XI of Chapter 23 if the proposal is located within any Overlay Zoning District (Airport, Geologic Hazard, or Historic Townsites Overlay Districts) or a Special Flood Hazard Area identified by maps officially adopted by the County. Section 4, Planning Questions P.5 27. Detail known State or Federal permits required for your proposed use(s) and the status of each permit. Provide a copy of any application or permit. Permits will be required from the Colorado Department of Transportation for crossing Colorado and interstate highways. Permits will be obtained by the TWP contractors prior to construction. No federal permits are required for the TWP. Public Works Questionnaire In accordance with Weld County staff recommendations of approval, prior to construction Thornton will submit a map showing location of the temporary access during construction and permanent access permit locations separate from the USR map. Permanent access design and locations will be developed during final design of the water tanks and pump stations. Information provided below is based on schematic level design. Access for these appurtenant facilities will be for TWP operators to conduct up to one visit per day of the water tank and pump station locations to inspect security and operation of each facility. 1. Describe the access location and applicable use types (i.e., agricultural, residential, commercial/industrial, and/or oil and gas) of all existing and proposed accesses to the parcel. Include the approximate distance each access is (or will be if proposed) from an intersecting county road. State that no existing access is present or that no new access is proposed, if applicable. Section 4, Public Works Questions PW.2. + Water Tank— No existing access is present. The proposed access is located off of County Road 13 approximately 710 feet south of County Road 13 and Larimer County Road 56 intersection. County Road 92 does not intersect County Road 13 at this location; therefore, distance reflects proximity to Larimer County road that is on the opposite side of County Road 13. + Pump Station 1— Access will be from County Road 50 at an existing oil and gas permitted access (APOG19-004 Kerr McGee Gathering LLC) located approximately 1,880 feet east of County Road 50 and County Road 13 intersection. + Pump Station 2 — No existing access is present on the proposed site. The proposed access is located off of County Road 17 approximately 550 feet north of County Road 17 and County Road 2 intersection. Thornton and/or TWP contractors will obtain access permits as applicable. 2. Describe any anticipated change(s) to an existing access, if applicable. If required by Weld County, tracking control will be constructed at the existing access located at Pump Station 1 per Weld County requirements. TWP USR SUPPLEMENT 2 PROCEDURAL GUIDE 2021 PG2021-6 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION 3. Describe in detail any existing or proposed access gate including its location. • Water Tank —A 6 -foot high chainlink gate with barbed wire will be installed no less than 35 feet from the edge of County Road 13 traveled surface. + Pump Station 1— No gate will be installed at the access from County Road 50. A gate will be installed approximately 240 feet south of County Road 50 along an existing two track road used for oil and gas operations . + Pump Station 2 — Water Tank —A 6 -foot high chainlink gate with barbed wire will be installed no less than 35 feet from the edge of County Road 17 traveled surface. 4. Describe the location of all existing accesses on adjacent parcels and on parcels located on the opposite side of the road. Include the approximate distance each access is from an intersecting county road. • Water Tank o Opposite side of road: There is no access along County Road 13 on the parcel opposite of the water tank parcel. o South parcel: Approximately 900 feet south of County Road 13 and Larimer County Road 56 intersection. County Road 92 does not intersect County Road 13 at this location; therefore, distance reflects proximity to Larimer County road that is on the opposite side of County Road 13. o North parcel: None. • Pump Station 1 o Opposite side of road: 1)Approximately 550 feet east of County Road 50 and County Road 13; 2) Approximately 2,060 feet east of County Road 50 and County Road 13 intersection. o East parcel: Approximately 2,670 feet east of County Road 50 and County Road 13 intersection o West parcel: Approximately 580 feet east of County Road 50 and County road 13 intersection. + Pump Station 2 o Opposite side of road: Circular driveway 1) Approximately 170 feet north of County Road 17 and County Road 2 intersection; 2) Approximately 80 feet north of County Road 17 and County Road 2 intersection. o South parcel: None. The Pump Station 2 parcel is adjacent to County Road 2 on the south property line. o North parcel: Approximately 1,020 feet north of County Road 17 and County Road 2 intersection. 5. Describe any difficulties seeing oncoming traffic from an existing access and any anticipated difficulties seeing oncoming traffic from a proposed access. • Water Tank —There are no anticipated difficulties seeing oncoming traffic from the proposed access. + Pump Station 1— There are no known difficulties seeing oncoming traffic from the existing access. TWP USR SUPPLEMENT 2 PROCEDURAL GUIDE 2021 PG2021-7 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • Pump Station 2 — There are no anticipated difficulties seeing oncoming traffic from the proposed access. 6. Describe any horizontal curve (using terms like mild curve, sharp curve, reverse curve, etc.) in the vicinity of an existing or proposed access. • Water Tank —There are no horizontal curves in the vicinity of the proposed access location. • Pump Station 1 — There are no horizontal curves in the vicinity of the existing access location. • Pump Station 2 — There are no horizontal curves in the vicinity of the proposed access location. 7. Describe the topography (using terms like flat, slight hills, steep hills, etc.) of the road in the vicinity of an existing or proposed access. • Water Tank — The topography is relatively flat at the proposed access location. • Pump Station 1— The topography is relatively flat at the existing access location. • Pump Station 2 — The topography is relatively flat at the proposed access location. Environmental Health Questionnaire 1. Discuss the existing and proposed potable water source. If utilizing a drinking water well, include either the well permit or well permit application that was submitted to the State Division of Water Resources. If utilizing a public water tap, include a letter from the Water District, a tap or meter number, or a copy of the water bill. Section 4, Environmental Health Questions EH.1 and Section 14. 2. Discuss the existing and proposed sewage disposal system. What type of sewage disposal system is on the property? If utilizing an existing on -site wastewater treatment system, provide the on - site wastewater treatment permit number. (If there is no on -site wastewater treatment permit due to the age of the existing on -site wastewater treatment system, apply for a on -site wastewater treatment permit through the Department of Public Health and Environment prior to submitting this application.) If a new on -site wastewater treatment system will be installed, please state "a new on -site wastewater treatment system is proposed." (Only propose portable toilets if the use is consistent with the Department of Public Health and Environment's portable toilet policy.) Section 4, Environmental Health Questions EH.2and Section 15. 3. If storage or warehousing is proposed, what type of items will be stored? Section 4, Environmental Health Questions EH.3. 4. Describe where and how storage and/or stockpile of wastes, chemicals, and/or petroleum will occur on this site. Section 4, Environmental Health Questions EH.4. 5. If there will be fuel storage on site, indicate the gallons and the secondary containment. State the number of tanks and gallons per tank. Section 4, Environmental Health Questions EH.5. TWP USR SUPPLEMENT 2 PROCEDURAL GUIDE 2021 PG2021-8 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION 6. If there will be washing of vehicles or equipment on site, indicate how the wash water will be contained. Section 4, Environmental Health Questions EH.6. 7. If there will be floor drains, indicate how the fluids will be contained. Section 4, Environmental Health Questions EH.7. 8. Indicate if there will be any air emissions (e.g. painting, oil storage, etc.). Section 4, Environmental Health Questions EH.8. 9. Provide a design and operations plan if applicable (e.g. composting, landfills, etc.). Section 4, Environmental Health Questions EH.9. 10. Provide a nuisance management plan if applicable (e.g. dairies, feedlots, etc.). Section 4, Environmental Health Questions EH.10. TWP USR SUPPLEMENT 2 PROCEDURAL GUIDE 2021 PG2021-9 WCC Section 23-2-510 Section A Applicant's Name and Telephone Number This section addresses WCC Section 23-2-510 A. A. The applicant's name and telephone number. Applicant City of Thornton Brett E. Henry, Executive Director— Infrastructure Department Phone: (720) 977-6700 E-mail: Brett.Henry@thorntonCO.gov TWP USR SUPPLEMENT 2 SECTION A APPLICANTS NAME AND TELEPHONE NUMBER A-1 Section B Address of the Applicant This section addresses WCC Section 23-2-510 B. B. Address of the applicant and general OFFICE. City of Thornton Brett E. Henry, Executive Director— Infrastructure Department 12450 Washington Street Thornton, Colorado 80241 TWP USR SUPPLEMENT 2 SECTION B ADDRESS OF THE APPLICANT B-1 Section C Summary Statement of the Project This section addresses WCC Section 23-2-510 C. C.1 Source, capacity, size, destination and type of facilities, support STRUCTURES, lines, etc., involved. This section addresses WCC Section 23-2-510 C.1, and the USR Questionnaire, Planning 1.a. Thornton is proposing to locate and construct the TWP, a water delivery system that will convey high quality domestic water Thornton purchased in the mid -1980's from the WSSC system, located in Larimer County, to Thornton. The TWP includes approximately 60 miles of pipeline through Larimer and Weld Counties to Thornton. This Second Supplemental Permit Application (Supplement 2) requests approval to locate and construct the TWP water pipeline and associated appurtenances in unincorporated Weld County, Colorado, which includes approximately 34 miles of a buried 42 - inch diameter water pipeline capable of conveying 40 mgd. The TWP appurtenances in unincorporated Weld County include buried fiber optic cable, various buried water pipeline structures and valve vaults including access manways, blow -off assemblies, air release vaults, and isolation valve vaults, a 1 -million -gallon steel water tank, and two pump stations. Additional information is included in Section C.2.a. C.2. A detailed report shall be submitted which includes information on the following Items: C.2.a. A description of the PIPELINE — DOMESTIC WATER. This section addresses WCC Section 23-2-510 C.2.a, and the USR Questionnaire, Planning 1.a, 1.j, 1.k, 1.q, 1.r 1.s and Building 1, 3. TWP Components in Unincorporated Weld County The TWP components in unincorporated Weld County include the following: + Water pipeline. Approximately 34 miles of a buried, 42 -inch diameter water pipeline capable of conveying 40 mgd of water will be constructed in unincorporated Weld County. The water pipeline will be buried at a minimum depth of 4 feet below grade. The depth of bury will vary based on existing utility crossings, road crossings, water crossings, other existing or proposed features, and property owner's reasonable preferences. Typically, the TWP consists of a 50 -foot permanent easement for the water pipeline and an additional 40 -foot temporary easement for construction. The TWP is not located within Weld County ROW or future planned ROW except to cross ROW. Thornton understands that, if the TWP crosses Weld County ROW, then use of that ROW will require Weld County approval. Figure C.2.a.la and Figure C.2.a.lb show the water pipeline alignment. • Appurtenances. o Buried communications. Approximately 34 miles of buried fiber optic cable, including buried manholes, test stations, and other fiber optic cable appurtenances will generally parallel the water pipeline in unincorporated Weld County. The fiber optic cable will be installed in close proximity to the water pipeline. The fiber optic cable will allow Thornton to remotely operate the TWP. The cable will be buried at a minimum depth of 3 feet below grade. The depth of bury will vary based on existing utility crossings, road crossings, water crossings, or other existing or proposed features, and property owner's reasonable preferences. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-1 Thornton Water Project CR 10 Thornton 0. —C1 K U W*—"\--- Me 00 0I CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/19/2021 l) _ 0 s 0.875 JOHNSTOWN 1.75 1 inch = 1.75 miles Miles BERTHOUD CR 46 4 "*� w `} �w rJ w P. TWP in Unincorporated t Railroad Weld County River/Stream/Canal/Ditch TWP outside Unincorporated 1 Lake/Reservoir "" Weld County —• County Boundary Figure C.2.a.la TWP Location Map Sources NHD COWR Weis County COOT W u78988_THORNTON_NORTHERN_PROJECTITASK_ORDER_5l5 1_PERMITTING%GISWAPFILESIWELD USRIRESOURCE_MAPSPERMITAPP ?021TTWP_LOCATION_MAP MXD JQUAN 1/19/2021 12 18 52 PM DR • .'---C ! i o y FLAGGDa ' X W` Thornton Water Project S. •!ur Motif I Dry,•"r' Ppl1� 4 _ PIKE RIB 'rgn,m Pitch 0 • o oQo O r CR 18 ARAPAHOE RD: • ERIE _sl\ ;,C„_C1 1f[4i. i w J I•`, FlC'� l A rc/2 t.P✓ mac • < T�, �l,} C 1601IH AVE • .Y� Thornton CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/19/2021 0 0.875 on a: RE PKWY C _yet.- r-- r• /'mo.'s / O +.. —49O ve 1 V� •el) .11"j S er r,� BROOMFIEL- o A a .s I a. 1.75 1 inch = 1 75 miles Miles ••S•. e•raas r.. •• � ....- • 2 Sill TWP in Unincorporated Weld County TWP outside Unincorporated Weld County County Boundary a cc Weld County 168TH AVE •.a••m.•••••rJ• .• A`.• LL AdamstQounty W/ J/rtrY. H f !fir t Railroad River/Stream/Canal/Ditch Lake/Reservoir CR 2.5 _ BASELINE RD LONGS PEAK -ST .BU SH S T _ "-, W I Y O m • -c e: • BRIDGE ST •-Q Figure C.2.a.lb TWP Location Map Sources. NHO. COWR, Wda County, CDOT W'418988 THORNTON NORTHERN PROJECTITASK ORDER 5L5 1 PERMITTINGIGISMAPFILESIWELD USRIRESOURCE MAPSIPERMITAPP 20211TWP LOCATION MAP MXD JOUAN 11'9/2021 /2 852 PM THORNTON THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION o Other buried appurtenances. Various buried water pipeline appurtenances and structures, including access manways, blow off assemblies (used to drain the water pipeline), combination air release valve vaults (used to exhaust air when filling the water pipeline and admitting air during draining operations), and isolation valve vaults will be constructed. Photographs of example appurtenances and structures are shown in Figure C.2.a.2. The size of structures and interior components of manholes and vaults will be designed specifically for the TWP and could vary from the description. Combination Air Release Valve Vault. Photo of combination air release valve vault after construction. Vault is a concrete vault, buried below grade. Vault houses air release valves and an access manway. Visible features include the air vent, access hatch, and valve box markers. Blow -off Assembly with Discharge Structure. Photo of blow -off manhole, pump well manhole, and dissipation structure after construction. The blow -off manhole is a concrete manhole that houses a blow - off drain valve. The pump well manhole is a concrete manhole that houses a pump out pipeline. The dissipation structure is a concrete structure located at grade. Visible features include the air vent, dissipation structure, manhole covers, and valve box markers. Isolation Valve Vault. Photo of isolation vault after construction. Vault is a concrete vault, buried below grade. Vault houses an isolation valve, air release/vacuum valves, and miscellaneous piping. Visible features include the air vent, access hatches, and valve box markers. Blow -off Assembly with Pump Out. Photo of blow -off manhole and pump well manhole after construction. The blow -off manhole is a concrete manhole that houses a blow -off drain valve. The pump well manhole is a concrete manhole that houses a pump out pipeline. Visible features include the air vent, manhole covers, and valve box markers. FIGURE C.2.a.2 Example Buried Appurtenances TWP USR SUPPLEMEN 1 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-4 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION o Water Tank. An approximate 1 -million -gallon water tank will be constructed on a site located south of the intersection of County Road 13 and County Road 92. This site is next to an existing water tank. The water tank will require an approximate 1.67 -acre site for the approximate 84 -foot diameter, 24 -foot tall steel water tank. Land has been acquired from the property owner for this appurtenance. The water tank is planned to be painted a shade of tan to blend into the surrounding area. Gravel access and parking will be constructed and the remaining disturbed area, including vegetation, will be restored to pre -construction conditions. Lighting will be installed for security and will comply with WCC. Six-foot high chain link fencing with barbed wire for security will be located around the perimeter of the site and will comply with WCC. An example photo of a similar tank is shown in Figure C.2.a.3 and the preliminary layout of the water tank site is included on Figure C.2.a.4. w t I a "ask. * t. FIGURE C.2.a.3 Example Appurtenance: Water Tank FIGURE C.2.a.4 Water Tank Preliminary Layout TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-5 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION In response to Weld County Health Department Comment: "Please include information on how containment would be addressed should catastrophic failure of the one -million -gallon water tank occurs. Are there downstream properties that would be affected?" the following information is provided: The 1 -million -gallon steel water tank will be designed and sealed by a registered Professional Engineer in the State of Colorado. It will be equipped with an overflow pipe having capacity equal to that of the water pipeline to prevent catastrophic failure should the emergency automatic shutdown control system fail to turn off pumps at the high-water elevation. The overflow will discharge on the northeast side of the water tank. Any water discharged would sheet flow to the northeast, off the water tank parcel, to the adjacent agricultural parcel where it would be intercepted by a small natural drainage that flows to the east north east. This drainage flows across agricultural properties for approximately 4.5 miles to Black Hollow Reservoir. There are no structures in the drainage path, and damage from unforeseen discharges from the water tank are not expected. The raw water is not anticipated to contain any harmful contaminants. There are no known Weld County Code and Building Code requirements for secondary containment of unexpected discharges of water from the water tank. Previous discussions with Weld County staff have not indicated a desire for secondary containment, and it is not a typical practice for water tanks such as the one proposed. o Pump stations. There are two pump stations in unincorporated Weld County. Land is being acquired from the property owners for these appurtenances. ■ The Pump Station 1 site is located approximately 0.5 miles east of the intersection of County Road 13 and County Road 50. The site is approximately 3.75 acres and will include an approximate 10,000 square foot pump house building and approximately 3,000 square feet of equipment pads outside of the building. Paved access and parking will be constructed and the remaining disturbed areas, including vegetation, will be restored to pre -construction conditions. Lighting will be installed for security and will comply with WCC. Six-foot high chain link fencing with barbed wire for security will be located around the perimeter of the site and will comply with WCC. Figure C.2.a.5 shows the preliminary layout of the Pump Station 1 site. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-6 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION r ROW -/ • RAN NO BUILDING! NO STORAGE LIMITS OF GRADING, TYP PROPOSED FLOW PATH, TYP FIGURE C.2.a.5 Pump Station 1 Preliminary Layout • The Pump Station 2 site is located approximately 0.2 miles north of the intersection of County Road 17 and County Road 2. The site is approximately 8.40 acres and will include an approximate 15,000 square foot pump house building, an approximate 15,000 square foot forebay, and approximately 3,000 square feet of equipment pads outside the pump station/forebay. Paved access and parking will be constructed and the remaining disturbed areas, including vegetation, will be restored to pre -construction conditions. Lighting will be installed for security and will comply with WCC. Six-foot high chain link fencing with barbed wire for security will be located around the perimeter of the site and will comply with WCC. Figure C.2.a.6 shows the preliminary layout of the Pump Station 2 site. An emergency backup diesel generator might be located outside at each of the pump stations for emergency backup power if a second electrical feed is not included. If a second electrical feed is feasible and cost-effective, emergency diesel powered backup generators will not be required. Thornton will continue to coordinate with PVREA and United Power to determine specific requirements for power service to the pump stations. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT (1 7 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION PROPERTY/ SEC -ION LINE p • •• r ra 3 STORM PIPE PROPOSED FLOW PATH, TYP -- /'-- H N ILDING/ GE 1214)14-3 L.. FIGURE C.2.a.6 Pump Station 2 Preliminary Layout TWP Components in Incorporated Weld County Approximately 11 miles of the TWP in Weld County are located in incorporated areas of Weld County in Dacono, Firestone, Frederick, Johnstown, Platteville, Severance, Timnath, and Windsor, including roads that have been annexed by local governments. Appurtenances are as described for unincorporated Weld County. Thornton understands that approval and permits will be required with government agencies for the portions of the TWP located within these incorporated areas as appropriate. Information provided in this Supplement 2 on the TWP components located within these incorporated areas is of a general nature and is included to present a more complete scope of the TWP. Land Acquisition Thornton has, at the time Supplement 2 was filed, acquired over 85% of the easements necessary to construct the full length of the TWP and its appurtenances in unincorporated Weld County and has purchased land in fee for the water tank through good -faith negotiations with property owners and only used eminent domain when all other reasonable options have been explored. Typically non- exclusive permanent easements have been acquired for installation, operation, and maintenance of the water pipeline and appurtenances. The typical permanent easement width is 50 -feet wide, and the typical temporary construction easement is an additional 40 -feet in width. Land is being acquired in fee for the water tank and pump station sites. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT 0 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION The TWP is developed in a manner that is respectful of private property rights. As part of the process to negotiate the purchase of easements and the fee parcels, Thornton's land agents have worked with property owners along the TWP route to explain water pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline and its appurtenances that best meets property owners' reasonable preferences, including routing the water pipeline to minimize impacts to the operation of irrigation equipment, structures, trees, and other infrastructure. Easements and fee parcels were negotiated based on fair market value. The easements grant Thornton an area to construct, operate, and maintain the water pipeline. Property owners will maintain fee title to the land. Property owners can continue to use the land within the easement area for purposes such as farming, grazing, or access, so long as such uses do not interfere with or endanger the operation of the TWP. The predominant land use in the TWP area, agricultural use, is compatible with operation of the TWP because the water pipeline and fiber optic cable will be buried below the plow line. As of January 27, 2020, Thornton or its land agents have contacted the owners of the remaining 15% of the parcels needed for easements and a pump station site, and have entered into good faith negotiations with those property owners. Part of those good faith negotiations include evaluation of property owner requested changes in easement document language, alignment changes, appraisals, adjustment in proposed compensation and presentation of final offers. Thornton will provide an update of the status of its easement and fee title acquisitions to the Weld County Planning Department prior to the Board of County Commissioner hearing. C.2.b. A description of the preferred route or location of the PIPELINE — DOMESTIC WATER and reasons for its selection. This section addresses WCC Section 23-2-510 C.2.b and the criteria described in WCCSections 23-2-480 A.1, 23-2-480 A.3, 23-2-480 A.5, 23-2-480 A.6, 23-2-480 A.7, 23-2-490 A, 23-2-490 C, 23-2-490 E, 23-2-490 F, and 23-2-490 G. The water pipeline for the TWP includes approximately 34 miles of a buried 42 -inch water pipeline and associated appurtenances in unincorporated Weld County, Colorado. The water pipeline alignment generally runs north/south and extends from approximately %z mile south of County Road 92 to County Road 2 as follows: + The water pipeline generally parallels County Road 13 for approximately 1.4 miles in unincorporated Weld County from County Road 92 to 0.4 miles south of County Road 90. • The water pipeline transitions east and south to parallel County Road 13, within 0.25 miles east of County Road 13, for approximately 3.6 miles, to 0.5 miles north of Colorado Highway 14 in unincorporated Weld County, then enters the Town of Timnath for approximately 5.3 miles. + The water pipeline transitions south out of the Town of Timnath near County Road 72 and parallels County Road 13 to County Road 6811/z for approximately 1.6 miles in unincorporated Weld County, then enters the Town of Windsor for approximately 3.5 miles. + The water pipeline transitions south out of the Town of Windsor near Crossroads Boulevard and generally parallels County Road 13 for 2 miles to US Highway 34, then transitions east parallel to US Highway 34 for approximately 0.5 miles before transitioning south for approximately 4.4 miles to County Road 50, then enters the Town of Johnstown for approximately 3.7 miles. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-9 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • The water pipeline transitions out of the Town of Johnstown near County Road 44 and parallels County Road 15 for approximately 1 mile to County Road 42, then transitions east for approximately 0.5 miles then south and generally parallels County Road 15% for approximately 5.8 miles in unincorporated Weld County and 0.2 miles in the Town of Johnstown to Colorado Highway 66. + The water pipeline transitions east parallel to Colorado Highway 66 for approximately 0.5 miles to County Road 17 where it transitions south for approximately 14.9 miles (approximately 12.6 miles in unincorporated Weld County) to County Road 2. At the Weld County Land Use hearing on August 26, 2020, the BOCC changed its position on its preference and policy to not allow parallel running utilities in the Weld County ROW and continued the hearing until September 16, 2020 for Thornton to discuss locating portions of the water pipeline in Weld County ROW with Weld County Public Works staff. During that time, Thornton and Weld County Public Works staff worked together and preliminarily identified six (6) areas where the water pipeline could potentially be located in Weld County ROW. Those locations were presented by Weld County Public Works staff to the BOCC at the continued hearing on September 16, 2020. Staff indicated that those potential areas could be used for the water pipeline subject to more detailed analysis by Thornton. The BOCC then continued the hearing until May 5, 2021. Thornton performed a ROW feasibility analysis that included non -economic factors for evaluating locating the TWP water pipeline within ROW, including at the six (6) locations presented to the BOCC at the September 16, 2020 hearing, as well as a comparative cost analysis on a per linear foot of pipeline installed. The ROW feasibility analysis was further based on clarification provided by Weld County Public Works staff regarding Weld County requirements and conditions that would need to be met to locate the water pipeline in Weld County ROW. The ROW feasibility analysis included differential costs for locating the water pipeline within Weld County ROW, including at the six (6) locations. The ROW feasibility analysis concluded that locating the water pipeline in Weld County ROW was not in the best interests of Weld County or Thornton. The ROW feasibility analysis is summarized in Section C.2.b and is presented in Technical Memorandum TWP Feasibility of Alternatively Locating TWP Water Pipeline within Weld County Right -of -Way, included in Appendix G, ROW Feasibility Analysis. The TWP is not located within Weld County ROW or future planned ROW except where it must cross ROW. Thornton understands that, if the TWP crosses Weld County ROW, then use of that ROW will require Weld County approval. Figure C.2.a.la and Figure C.2.a.lb show the water pipeline alignment. Portions of the TWP in Weld County include approximately 11 miles in incorporated areas of Dacono, Firestone, Frederick, Johnstown, Platteville, Severance, Timnath, and Windsor including roads that have been annexed by these local governments. Areas shown as a dashed line on Figure C.2.a.la and Figure C.2.a.lb show the water pipeline alignment outside of unincorporated Weld County. An approximate 1 -million -gallon water tank will be constructed on a site located south of the intersection of County Road 13 and County Road 92. This site is next to an existing water tank. The Pump Station 1 site is located approximately 0.5 miles east of the intersection of County Road 13 and County Road 50. The Pump Station 2 site is located approximately 0.2 miles north of the intersection of County Road 17 and County Road 2. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-10 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Water Pipeline Alignment Selection A series of evaluations were conducted to develop the preferred route for the water pipeline alignment for the TWP in Weld County to meet the project purpose and need. See Purpose and Need section. A multi -step process was used with considerable thought to minimize impacts to local communities and future development. Afour-tiered evaluation program was implemented: First, alternative project corridors within a broader evaluation area were evaluated with input from potentially impacted communities to determine a preferred corridor. Second, with input from potentially impacted property owners within the preferred corridor, route configurations were evaluated within the preferred corridor from step two. Third, an alternative feasibility analysis of locating the water pipeline within Weld County ROW was conducted. Fourth, based on the analysis results of step three, Thornton concluded it was not feasible to locate the water pipeline in Weld County ROW. Evaluations are summarized below: + Preferred Corridor Evaluation - Evaluation of four corridor alternatives within a broader evaluation area to determine a preferred corridor. • Preferred Route Development— Evaluation of possible locations for the water pipeline within the preferred corridor for suitability to determine a preferred route. • ROW Feasibility Analysis - Evaluation of non -economic factors to consider in locating the TWP water pipeline within ROW as well as a comparative cost analysis on a per linear foot of pipeline installed. • Final Water Pipeline Easement Development - Thornton worked with impacted property owners to determine the location for the water pipeline that best meets property owners' reasonable preferences. Preferred Corridor Evaluation Before conducting public outreach, which is not required by Weld County's USR permit application process, and to determine the alternative corridor least impactful to local communities, Thornton conducted a series of outreach meetings with local governments and agencies that could be impacted by the TWP. Input from local governments and agencies was utilized in developing alternative corridors and identifying the preferred corridor. An evaluation area was established for developing alternative corridors. The evaluation area consists of an approximate 4- to 57/2 -mile wide path from County Road 96 south to County Road 2. The evaluation area is bounded by 1-25 on the west and County Road 17 %z on the east. Alternative corridors within the evaluation area were identified using readily and publicly available geographic information system (GIS) data. Guidelines used to identify the alternative corridors include the following: • Input from potentially affected local governments + Minimizing impacts to ROW + Minimizing impacts to water bodies and wetlands • Bypassing geological hazardous areas + Minimizing impacts to environmentally sensitive areas such as open space or conservation areas + Minimize impacts to congested areas, typically in developed, densely populated areas TWP USR SUPPLEMENT 2 SECTION CSUMMARY STATEMENT OF THE PROJECT C-11 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • Utilizing Thornton -owned property • Following ROW/easements/property lines Four'A-mile wide alternative corridors were initially developed based on input received from local government outreach. These four alternative corridors were analyzed using non -economic data to determine the preferred corridor. The non -economic criteria and method of measurement used in the evaluation of alternative corridors included the following: + Local Government Preference - Rating based on compliance with local government preferences • Geologic Hazards - Estimated length within areas identified as having mine subsidence + Community Impact - Number of local governments crossed + Wetland/Riparian Crossing - Estimated length of wetland/riparian areas crossed • Floodplain Crossings - Estimated length of floodplain areas crossed + Parcel Owners - Number of unique parcel owners crossed • ROW - Estimated possible length of water pipeline in ROW Information regarding the preferred corridor alternative analysis and selection process is included in Technical Report Thornton Water Project, Reach 2 Alternative Corridors Analysis, September 2016 (see Appendix F). The location of the preferred corridor was based on the TWP purpose and need, as well as information and guidance received from Weld County Public Works and Planning staff, Dacono, Firestone, Mead, Milliken, Johnstown, Timnath, Windsor and others. Preferred Route Development After the preferred corridor was established, specific alignments within the preferred corridor were identified to determine the preferred route for the water pipeline alignment. Thornton established criteria, reviewed existing infrastructure and encumbrances, and considered input from property owners, Weld County Public Works staff, and local governments to determine the water pipeline alignment. The preferred route was developed to not be located within Weld County ROW or future planned ROW except where it must cross ROW. Thornton understands that, if the TWP crosses Weld County ROW, then use of that ROW will require Weld County approval. Thornton reviewed GMA boundaries and transportation master plans for Dacono, Berthoud, Firestone, Forth Lupton, Frederick, Johnstown, Mead, Milliken, Platteville, Severance, Timnath, and Windsor to determine the extent of future ROW within GMA boundaries. Thornton will coordinate the location of the water pipeline with these municipalities as appropriate where the water pipeline is located within the municipality's boundary. Where practicable, the criteria for developing the preferred route in unincorporated Weld County included: • Be adjacent to roads, current or future road ROW, existing utility easements, and property lines. + Minimize impacts to agricultural use. + Consider property owner preference. • Minimize impacts to existing structures. + Cross waters, irrigation ditches, roads, and railroads perpendicular to the feature. + Minimize road crossings. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-12 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • Minimize impacts to environmental and cultural resources. • Minimize impacts to open lands/conservation easements. + Provide a sound engineering solution. Thornton reviewed aerial photography and performed site reconnaissance of the preferred corridor to develop a draft route based on the criteria listed above. Title records were reviewed, and rights of entry were requested for properties crossed by the draft route to determine existing encumbrances on these properties. Next, Thornton began discussions with property owners and conducted environmental surveys and planimetric survey of property boundaries, existing infrastructure, and utilities on the properties for which written right of entry was granted to Thornton by the property owner. As part of the surveys, existing easement locations and easement restrictions were identified. Thornton approached easement holders without exclusive rights to discuss opportunities for shared and/or overlapping easements. During discussions with property owners, Thornton reviewed possible water pipeline locations to minimize impacts. Based on information obtained from surveys, easement holders, and property owner discussions, the draft route was revised and refined to reflect the water pipeline alignment for the TWP as presented in Supplement 1. ROW Feasibility Analysis At the Weld County Land Use hearing on August 26, 2020, the BOCC changed its position on its preference and policy to not allow parallel running utilities in the Weld County ROW and continued the hearing until September 16, 2020 for Thornton to discuss locating portions of the water pipeline in Weld County ROW with Weld County Public Works staff. During that time, Thornton and Weld County Public Works staff worked together and preliminarily identified six (6) areas where the water pipeline could potentially be located in Weld County ROW. Those locations were presented by Weld County Public Works staff to the BOCC at the continued hearing on September 16, 2020. Staff indicated that those potential areas could be used for the water pipeline subject to more detailed analysis by Thornton. The BOCC then continued the hearing until May 5, 2021. Thornton performed a ROW feasibility analysis that included non -economic factors for evaluating locating the TWP water pipeline within ROW, including at the six (6) locations presented to the BOCC at the September 16, 2020 hearing, as well as a comparative cost analysis on a per linear foot of pipeline installed. The ROW feasibility analysis was further based on clarification provided by Weld County Public Works staff regarding Weld County requirements and conditions that would need to be met to locate the water pipeline in Weld County ROW. The ROW feasibility analysis included differential costs for locating the water pipeline within Weld County ROW, including at the six (6) locations. The ROW feasibility analysis concluded that locating the water pipeline in Weld County ROW was not in the best interests of Weld County or Thornton. The ROW feasibility analysis is summarized in Section C.2.b and is presented in Technical Memorandum TWP Feasibility of Alternatively Locating TWP Water Pipeline within Weld County Right -of -Way, included in Appendix G, ROW Feasibility Analysis TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-13 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Installation of the water pipeline in ROW compared to installation in a private easement has the following detrimental impacts: • Significant traffic impacts including requiring full road closures and multiple detours and causing traffic delays that increase safety risk to traveling public and construction workers. • Increased risk that TWP water pipeline will be damaged by third parties because Thornton would not have control of other work activities within Weld County ROW that could lead to inadvertent failure, requiring road closure and detours to perform repairs. • Significant safety risk to the traveling public and the workers tasked with maintaining the water pipeline during pipeline maintenance activities. + Increased impacts to locating future utilities within the right-of-way and adjacent to the TWP water pipeline. + Impacts to future Weld County roadway projects by increasing coordination needs and design and construction schedules as those roadway projects may require adjustment or relocation of the TWP water pipeline. + Additional costs of approximately $40,000,000 would be incurred to locate the TWP water pipeline within available right-of-way, not including the costs already paid for private easements. + Additional costs of approximately $8,300,000 would be incurred for the six (6) locations presented to the BOCC at the September 16, 2020 hearing. Based on these impacts identified in the ROW feasibility analysis, Thornton determined not to relocate the water pipeline into Weld County ROW. See Appendix G for additional information. Final Water Pipeline Easement Development After the Weld County ROW analysis was complete, Thornton has continued working with impacted property owners to determine the location for the water pipeline that best meets property owners' reasonable preferences and to negotiate easements. Thornton has, at the time Supplement 2 was filed, acquired over 85% of the easements necessary to construct the full length of the TWP and its appurtenances in unincorporated Weld County, and has purchased land in fee for the water tank. Thornton will acquire additional easements and fee parcels in advance of the May 5, 2021 hearing, and will provide an update to the BOCC in advance of that hearing. Based on information obtained from surveys, easement holders, and property owner discussions, the preferred route was revised and refined to reflect the water pipeline alignment for the TWP as presented in this Supplement 2 and shown in Figure C.2.a.la and C.2.a.lb. Water Tank and Pump Station Locations Site selection for the water tank and pump stations are based on the water pipeline alignment and the hydraulic operation of the system. These appurtenances are located along the water pipeline to avoid unnecessary lateral pipelines from the water pipeline to the appurtenance and improve hydraulic efficiency. The following describes the operation of the system, and reasons for selection of each of the sites for these appurtenant facilities. The TWP is comprised of the water pipeline, a 1 -million -gallon water tank, and three pump stations (one source water pump station in Larimer County; two pump stations in Weld County). Domestic water is obtained from WSSC Reservoir No. 4 in Larimer County and pumped into the water pipeline via the source water pump station at WSSC Reservoir No. 4. The source water pump station supplies domestic water to the water tank near the intersection of County Road 92 and County Road 13 in TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-14 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Weld County. The water tank provides hydraulic balancing for system operation. From the water tank, water flows through the water pipeline by gravity to Pump Station 1 located at the intersection of County Road 50 and County Road 13%. Pump station requirements are based on the pump head required to convey the maximum design flow of 40 mgd to Thornton. By using two pump stations instead of one in Weld County, the maximum operating pressure of the water pipeline can be maintained under 350 pounds per square inch (psi). If the required head was weighted more heavily to one of the pump stations, or if only a single pump station was used, maximum operating pressure in the water pipeline would increase from 350 up to 600 psi, depending upon pump station arrangement. By using two pump stations in Weld County, maximum operating pressure is lowered, increasing safety and decreasing the operating cost of the water pipeline. Pump Station 1 is a vertical turbine pump station operating on pressurized cans in the flow range of about 22 to 40 mgd. Flows less than about 22 mgd can get directly to Pump Station 2 without additional pumping. Pump Station 2 is a vertical turbine pump station located at the intersection of County Road 2 and County Road 17 and operates though the entire flow range of 3 to 40 mgd. Pump Station 2 operates on pressurized cans from 3 mgd to about 22 mgd. Flows greater than about 22 mgd are routed through a 1 -million -gallon forebay co -located with Pump Station 2. The inclusion of the water tank at County Road 92 and forebay at Pump Station 2 provide storage that allow the system to be operated throughout the design range of flows without the requirement that any two pump stations be paced at the same flow. This simplifies operation of the system and provides additional safety in controlling transient pressures that could damage the water pipeline. Site selection for the water tank is based on placing it at the highest point along the water pipeline. Situating the water tank at the high point provides efficiency in system operation, as the source water pump station must only provide enough head to fill the water tank. It also allows water to be conveyed by gravity from the water tank for the longest distance in the water pipeline in Weld County. The high point in the water pipeline is located approximately 600 feet south of County Road 92 on the east side of County Road 13. This location is next to an existing water tank and is approximately 1,200 feet from the nearest residential structure (located in Larimer County). Pump Station 1 is located based on hydraulic operation of the system and the profile of the water pipeline. The divide between the Big Thompson River and Little Thompson River drainages along the water pipeline alignment is located approximately 2,000 feet north of Colorado Highway 60 along County Road 13. This is a significant high point in the water pipeline. Based on the criteria to roughly split required head between the two pump stations in Weld County, Pump Station 1 needs to be located north of this point. Maximum operating pressure increases in the water pipeline between the divide and the location of Pump Station 1, so Pump Station 1 should be located as close to the divide as possible. Given existing constraints along the water pipeline alignment like existing and planned development in Johnstown, parcel size, and access availability, the closest appropriate site for Pump Station 1 is where the water pipeline crosses County Road 50. The location is currently used for agricultural operations and oil and gas pipelines. Pump Station 2 is located based on hydraulic operation of the system and the profile of the water pipeline. The location is based on the furthest point south for which Pump Station 1 can provide hydraulic head for the maximum design flow of 40 mgd, while considering existing and future development and access. Pump Station 2 is located at the northeast corner of the intersection of County Road 2 and County Road 17, in a dryland agricultural field. This location provides efficient hydraulic operation and keeps operating pressures in the water pipeline lower than they otherwise would be if Pump Station 2 was located further north. Locations considered to the south are too high in elevation for locating Pump Station 2. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-15 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION C.2.c. Procedures to be employed in mitigating any adverse impacts of the proposed routes or sites. This section addresses WCC Section 23-2-510 C.2.c and the criteria described in WCCSections 23-2-480 A.1, 23-2-480 A.2, 23-2-480 A.3, 23-2-480 A.4, 23-2-480 A.5, 23-2-480 A.7, 23-2-480 A.8, 23-2-490 A, 23-2-490 B, 23-2-490 C, 23-2-490 D, 23-2-490 E, 23-2-490 G, and 23-2-490 H, and USR Questionnaire, Planning 5. The criteria used for developing the water pipeline alignment described in Section C.2.b was implemented to minimize impacts to Weld County's future plans, property owners, agricultural use, traffic, irrigation ditches, existing infrastructure, and environmental and cultural resources. Mitigation measures for resources are presented throughout this Supplement 2 as indicated in Table C.2.c. TABLE C.2.c Impacted Existing Condition Reference to Mitigation Measures Location in Supplement 2 Impacted Existing Condition Impact Supplement 2 Section Reference Private Property Mitigable Section C.2.a, Land Acquisition; Section C.2.b, Preferred Route Development; C.2.c Private Property; C.2.d, Construction Activities 100 -Year Floodplains Mitigable Section C.2.c, Floodplain Information Air Quality Mitigable Section C.2.c, Air Quality Information Cultural No Significant Impact Appendix A, Natural and Cultural Resources Assessment Drainage and Erosion Mitigable Section C.2.c; Section 16, Drainage; Section 24, Soils Reports; Appendix C, Best Management Practices Geological Hazards Mitigable Section 24, Soils Reports; Appendix D, Soils Reports Groundwater Mitigable Section C.2.c, Groundwater Information Jurisdictional Waters No Significant Impact Appendix A, Natural and Cultural Resources Assessment Noise Mitigable Public Health and Safety Mitigable Special Status Species Mitigable Transportation Mitigable Vegetation Mitigable Wildlife Mitigable Section 23, Noise Study Section C.2.f Appendix A, Natural and Cultural Resources Assessment Section 17, Traffic Narrative Appendix A, Natural and Cultural Resources Assessment Appendix A, Natural and Cultural Resources Assessment Private Property Thornton's land agents negotiate the purchase of easements where needed based on fair market value. As part of the process to negotiate the purchase of easements, Thornton's land agents have TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-16 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION worked with property owners along the TWP route to explain water pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to minimize impacts to the operation of irrigation equipment, structures, trees, and other infrastructure The area disturbed for constructing the water pipeline will be restored to pre -construction conditions, including grade and vegetation, thus minimizing long-term impacts. Potential future repairs and maintenance could affect discrete areas of vegetation when the water pipeline is accessed in a particular location. Any vegetated areas disturbed during maintenance or required repairs will be restored by the methods used during construction. Property owners will be compensated for compensable damages, as well as receive fair market value for easements. Floodplain Information The TWP crosses five designated 100 -year floodplains in unincorporated Weld County as described herein and as shown on Figure C.2.c.la and Figure C.2.c.lb, 100 -Year Floodplains. The TWP will not alter floodplains. The water pipeline will utilize trenchless construction methods under waterbody crossings such as WOTUS (jurisdictional waters), including streams, rivers, lakes, and wetland areas. Work conducted within the floodplain fringe areas will be restored to pre - construction conditions and grades. Therefore, the TWP will mitigate impacts on the hydraulics and hydrology of the floodplain. Because impacts will be mitigated, no modeling has been conducted for this attachment. Thornton will obtain Floodplain Development permits and other approvals as required for floodplain crossings from Weld County or other agency as required after design has progressed. Information will be provided to Weld County as required to obtain permits. Floodplain crossing information was obtained from Weld County GIS data collected on January 8, 2021 from the online Weld County Downloadable Data repository. Floodplain crossings in unincorporated Weld County are shown on Figure C.2.c.la and Figure C.2.c.lb are identified below: + Big Dry Creek near County Road 17 • Little Dry Creek near County Road 17 + Saint Vrain Creek near Colorado Highway 66 • Tributary to Saint Vrain Creek approximately 1/3 mile south of County Road 34 near Diamond Reservoir + Big Thompson River near County Road 13% Floodplain crossings will utilize open -cut construction in the fringe area of the floodplain and trenchless construction methods under the ordinary high water mark and associated wetlands so that there will be no impact to jurisdictional waters. Spoils from trench excavations, construction - related equipment, materials, and supplies will be stored outside of the 100 -year floodplain per local floodplain regulations. Fringe areas using open -cut construction will be restored to pre - construction grades and vegetation after construction. Trenchless construction methods could include methods such as tunneling or auger boring techniques. Where trenchless construction methods are used, shafts will be located on either side of the water resource for launching and receiving the water pipeline and the fiber optic cable and will be located outside of the normal high water mark and associated wetlands. Shafts will be backfilled and compacted, and affected areas TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-17 Thornton Water Project `BERTHOUD r Cq Um ~ � r CR 12 (s s CR 10 rab- Thornton Y:A(LR -•P CJEI_ 9 ra— a O U -f _ CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/22/2021 0 S 0.875 JOHNSTOWN 1.75 1 inch = 1.75 miles Miles CR46 TWP in Unincorporated Weld County TWP outside Unincorporated Weld County County Boundary 4 --- Railroad River/Stream/Canal/Ditch Lake/Reservoir 100-yr Floodplain 100-yr Floodway LWW T:: -. W Figure C.2.c.la Floodplains Sources FEMA MHQ CDWR wrN County COOT Wt476986_rNORNTON._NORIHERN_PRO..ECTITASK .ORDER 5151_PERMITTINCICISMAPFILESYWELD_USRIRESOL.RCE_MAPSLPERMITAPP 202'tFLOODPLAINSMXD 1OUAN1O2/2021 •03546 AM Thornton Water Project Nen&I Lake) WILFRED RD R4 VERMILLION RD BERTHOUD CR26 s's.+VIST MIEW OR OXFORD SKYWAY DR KENOSHARD 3ERC: ?\ JASPER RD '4Y RD Thornton WATER PROJECT CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON. CO 80241-2405 1/22/2021 0 S 0.875 1.75 1 inch = 1.75 miles Miles TIPPLE PY fie -1•141/70 UDR ft rr• Noma 1iAtl, _ Greet wM1.n RatYoie JOHNSTOWN rr +A FIRESTONE BD L P C. EAV 2 Oitcr v , FIRESTONE 1ST ST' ifoT 11TH T1 BROOMFIEL D Pump Station 2 NOR'THGLENN TWP in Unincorporated SIM Weld County TWP outside Unincorporated "" Weld County County Boundary r_ • 2 CR 42 MILLIKEN a: 4W CR 40.5 /PLATTEVIL E Sand hGN Railroad River/Stream/Canal/Ditch Lake/Reservoir 100-yr Floodplain 100-yr Roadway CR 184 CR 18 PEAW ST Ha r L As EVANS LOCHBUIE Figure C.2.c.1 b Floodplains Sources FEMA. NH0. COWR- Wee Cairns. COOT W '478988 THORNTON NORTHERN PROiECT1TASK ORDER 515 1 PERMIT TINGCISWAPFIIESUNELD USRIRESOURCE MAPSIPERMITAPP 20211FtOODPIAINS MXD 1QUAN 1t2212021 1035-48 AM THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION will be restored to pre -construction conditions. A geotechnical investigation of geologic conditions near crossing locations will be completed during design. Currently, no areas have been identified that may pose a risk to trenchless construction methods; however, should any such locations be identified throughout the geotechnical investigation, Thornton will consult with applicable parties as required, including the affected property owners, Weld County, and other agencies to develop an alternative approach that will minimize impacts. The general standards required per WCC Chapter 23 that are applicable to the TWP will be met and include: + WCC Section 23-11-270 - A Floodplain Development Permit shall be required for all uses occurring within the FEMA mapped 100 -year floodplain to ensure conformance with the provisions of this ordinance and federal and state regulations. Thornton will obtain a Floodplain Development Permit for floodplain crossings as required. Air Quality Information Colorado requires that fugitive dust emissions be controlled during construction. The amount of surface clearing required for construction will exceed 25 acres; therefore, Thornton and/or the TWP contractors will develop a fugitive dust control plan, submit an air pollution emissions notice, and obtain a permit from CDPHE before construction activities in accordance with state air quality regulations. The TWP will be constructed under multiple packages and multiple permits will be obtained as required. Construction activities, such as vehicles driven over cleared ground, general disturbance to vegetated areas, or soil stockpiles susceptible to winds, can cause fugitive dust. During construction, dust control measures will be implemented. Examples of these mitigation measures that maybe used on the TWP include: + Speed limits for construction vehicles within the work area + Water application to disturbed areas, dirt access roads, and stockpiles + Erosion control techniques and best management practices + Revegetation of disturbed areas following construction activities Water will be used as needed for dust suppression during construction. Water sources could be nearby fire hydrants, water pipelines, and water trucks. Water may be purchased from local water providers for construction activities. During construction painting activities are anticipated to occur. TWP contractors will be required to meet federal, state, and local requirements limiting emission of volatile organic compounds. Permanent facilities associated with the TWP will comply with air pollution control regulations. The water pipeline, buried appurtenances, and water tank will not have emission sources; therefore, will not require a Colorado Air Emissions Permit. An emergency backup diesel generator might be located outside at each of the pump stations for emergency backup power if a second electrical feed is not included. If a second electrical feed is feasible and cost-effective, emergency diesel powered backup generators will not be required. Thornton will continue to coordinate with PVREA and United Power to determine specific requirements for power service to the pump stations. Regular maintenance will be performed to ensure that the generator provides backup power throughout its service life. The proposed generator will comply with county, state, and federal air quality TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-20 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION standards. If required by the state, a Colorado Air Emissions Permit will be obtained prior to system startup. Drainage and Erosion Development of the TWP considered water pipeline construction locations that minimize impacts to historical surface and subsurface water flows. Water pipeline crossings of jurisdictional waters, including wetlands, will be constructed utilizing trenchless construction methods. Surface drainage stormwater BMPs will include application of erosion control techniques and the successful revegetation of disturbed areas. The required Weld County grading permit and CDPHE construction stormwater permits and SWMPs will include detailed descriptions of BMPs that will be used to protect surface hydrology and water quality. Construction Water Quality Management Construction of the water pipeline will be via open cut and trenchless methods. In areas where open cut methods will be employed, the ground will be restored to pre -construction elevations restoring the historical drainage paths across the permanent easement. In the areas where trenchless methods will be employed the historical drainage paths will be undisturbed. Prior to construction, Thornton and/or the TWP contractors will obtain the required Weld County grading permit, and a Stormwater Discharge Associated with Construction Activity— General Permit from CDPHE. Construction SWMPs will be developed under the general permit to protect the quality of stormwater runoff during construction in accordance with the Construction Stormwater Discharge Permit requirements. Surface drainage BMPs implemented during construction will include application of erosion control techniques and the successful revegetation of disturbed areas. BMPs will be maintained and inspected. Site inspections will be conducted to meet the requirements and schedules stipulated under the permits. Failed BMPs will be replaced as required. After work is complete and final stabilization has been achieved, temporary BMPs will be removed. Final stabilization will be reached as defined in the Weld County Grading Permit and Stormwater Discharge Associated with Construction Activity - General Permit. Weld County Online Mapping was reviewed and the TWP does not fall within any areas designated as municipal separate storm sewer system (MS4). Construction wastewater associated with the potential dewatering of trenches will be handled in accordance with CDPHE permit discharge requirements. Prior to construction, Thornton and/or the TWP contractors will obtain a General Permit for Construction Dewatering Activities from CDPHE and specify the management measures to capture and manage any generated discharge. BMPs will also be deployed for construction dewatering activities, pursuant to the Construction Stormwater Discharge Permit and/or the Construction Dewatering Discharge Permit as appropriate for the site conditions and soil erodibility, to protect the quality of stormwater, surface water, and groundwater during construction of the TWP. The TWP will be hydrostatically tested prior to operation start up. Before discharge of hydrostatic test water from the water pipeline, Thornton and/or the TWP contractor will obtain a General Permit for Discharges from Hydrostatic Testing of Pipelines, Tanks, and Similar Vessels from CDPHE. Sampling and effluent limits will be in accordance with permit requirements. Appropriate criteria manuals and standards will be used for the development of the SWMPs and selection of BMPs. Manuals may include the Urban Storm Drainage Criteria Manual (USDCM) Volume 3 (Urban Drainage and Flood Control District, 2010, November), City of Greeley's BMPs for TWP USR SUPPLEMENT 2 SECTION CSUMMARY STATEMENT OF THE PROJECT C-21 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Utility Planning and Construction Through Rural, Wetland, and Riparian Lands (Leonard Rice Engineers, Inc., 2008, August), and/or other state and local guidance documents. Lists of example descriptions of common construction BMPs that could be used on the project are provided for reference purposes in Appendix C. These lists are not all inclusive. Items listed, and/or other construction BMPs, will be selected as appropriate based on site -specific conditions. Soil Erosion Surface drainage stormwater BMPs will include application of erosion control techniques and the successful revegetation of disturbed areas. The required Weld County grading permit and CDPHE construction stormwater permits and SWMP(s) will include detailed descriptions of BMPs that will be used to protect surface hydrology and water quality. BMPs will be implemented per the SWMP to minimize or mitigate soil erosion and revegetate disturbed areas. Soil erodibility along the TWP is shown in Figure C.2.c.2a and C.2.c.2b. The soil erodibility figure shows the NRCS K factor values. K factor values represent the susceptibility of soil erosion, transportability of the sediment, and the amount and rate of runoff given a particular rainfall event. Approximately 59% of the TWP is located within the low -to -medium soil erodibility range. A low -to -medium soil erodibility factor indicates that slight to moderate erosion is likely and that erosion -control measures may be needed. Approximately 38% of the TWP is located within the high soil erodibility range. High soil erodibility indicates that erosion is very likely and that erosion - control measures are advised, including revegetation of bare areas. Approximately 3% of the TWP is located in areas with no assigned value. BMPs will be maintained and inspected. Failed BMPs will be replaced as required. After work is complete and final stabilization has been achieved, temporary BMPs will be removed. Final stabilization will be reached as defined in the Weld County Grading Permit and the CDPHE Stormwater Discharge Associated with Construction Activity - General Permit. In areas with sandy soils and increased sloughing, mitigation measures in those area may include, but are not limited to, the following: ■ Stream and bank stabilization methods such as riprap protection or concrete mats ■ Imported backfill material such as low -strength concrete ■ Revegetation ■ Soil erosion blankets during construction ■ Trenchless construction methods Mitigation measures will be implemented in areas outside of any jurisdictional waters. A subsurface geotechnical investigation of geologic conditions utilizing soil and rock borings will be completed during design to further determine the subsurface soil conditions and associated geological hazards along the TWP route. Mitigation measures will be further refined during design to meet site -specific geological hazards. Post Construction Stormwater Quality To mitigate impacts caused by erosion, restoration activities for the TWP will consist of vegetation restoration and maintenance of areas disturbed by the TWP. Effects to vegetation along the easement areas will be temporary and mostly associated with construction. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-22 Thornton Water Project NVI ri ppl) I- & .S.iiiroge J Heserroii \'0 3 It 4 Glib A'b.�eiRoerveii Titer ir _.. Supply!tom"4?s,�;n$e ,I, Reur.oi, So 4 �a a 41 s y WILLOX LN VINE DR _ _..CHERRY ST LAPORTE AVE MOUNTAIN AVE • dd ULBERRY ST. • v~i LAUREL ST O �r ELIZABETH ' - z ST w Reservoir tiird DOUGLAS RD 0 re Itieitarti Lemke W U , • •: Z .r:•:RICHARDS LAKE RD • :---:1L. CC I- - N ce C o� P' IMP 4: • m. MOUNTAIN VISTA DR w Liadesuweree re 11' e D.. N�'w -1 O .8 J VINE DR BUCKINGHAM ST GOLN AVE i :PI TKIN ET RS/�F0 9TUART ST d _ STUART ST 8 l\ cc COLUMA,AiD- COLLINS CENT DRAKE RD SWALLOW RD =: 3 I FORT 0- 0 O x ix J a •0DFROz,O z w - > ti� b < `fps_..._, A. a AO LT, • J HORSETOOTH RD..z "rV$ . ,• R • • w ` O } T1 rn i '°NOEROT a1 r • LLoa 04 Z w y"i'-?ti _.< . a -1( I./.- y �i TROUTMAN PKpy', HARMONY RD SHIELDS ST U w 57TH ST ,• 1 11111 ST -r .< ;• - 29TH ST! LL fl 22ND ST 0 C x• w NDSWST- CR 14 O 37TH g1 w > •Lu\-1 Q U O Z, J -U w BERTHOUD Cr 10E ci / �Yz Merthyr d Re.ervi CR 10E'•;10E CR 10 Thornton VaATM P!4O.iEt;' CITY OF THORNTON COLORADO 12450 WASHINGTON ST 0 PROSPECT RD an — U a..;o STETSON U 71ST ST --4392 Great Rair Western rea flirt S 0.875 1.75 Miles HIT w z D O cx X LL Trwurar* Rnerr.. TIMNATH HARMONY RD CROSSP.OADS so TWP in Unincorporated Weld County TWP outside Unincorporated Weld County -• County Boundary —4— Railroad Lake/Reservoir Water Tank CR 74 4TH AVE ' H indsar l.mle f:AL T S T , J WINDSOR Pump Station 1 -Vt. %PM Soil Erodibility (K Factor) No Value Low (<0.20) Medium (0.20 - 0.40) ;474 High (>0.40) 7NCs Resm'wr 4TH AVE SEVERANCE EASTMAN PARK DR < :u - ELM,S z p. 2 u 110146 ♦ bate CR 64 213TH SI U) GREELEY 37TH ST 4ir1SI EVANS Figure C.2.c.2a Soil Erodibility THORNTON, CO 80241-2405 1/22/2021 1 inch = 1.75 miles Sources MRCS. NHD. CDYWR We court*. CDO W 147eaee THORNTON_NORTHERN_PROJECTITASX_ORDER-.5%5 1_PERMIT TINGCISWAPrIL EStWEL D.-USRIRESOURCE_MAPSIPERMITAPP 2021LSOIL_EROOIBIUTv MXD .OUAN +222021 11 26 56 AM Thornton Water Project HIstland Lake 91H AVE 51H AVE LONGMONT 1 KENOSHA RD ARAPAHOE.RD BELLA RJSA PY'WCR 20 • JOHNSTOWN FIRESTONE BD FIRESTONE FREDERICK ACON,O'" 8TH ST V cc �I W W ce Pump Station 2 CR325O Sand Hill FL aA e GRAND AVE EVANS FORT LUPTON LOCHBUIE BASELINE RU BRIDGE ST (s. Thornton lY CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON. CO 80241-2405 1/22/2021 0 S 0.875 1 75 1 inch = 1.75 miles Miles TWP in Unincorporated Weld County TWP outside Unincorporated OBIS Weld County —• County Boundary —4— Railroad Lake/Reservoir Soil Erodibility (K Factor) No Value Low (<0.20) Medium (0.20 0 40) High (>0.40) Figure C.2.c.2b Soil Erodibility Sources- NRCS NHD CDWR Wee Canty COO I W 'A18988 THORNTON NORTHERN PROJECT\TASK ORDER 5%5' PERMIT TINGC1SWAPFILES1WELD USR‘RESOURCE MAPSIPERMITAPP 202'SSOll ERODIBILITY MXO JOUAN 1/22/2021 " 2656 AM THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Areas disturbed for water pipeline construction will be restored following construction to pre - construction grades and vegetation conditions with few exceptions. An example of an exception would be minor grading necessary following construction to restore a stable slope. In general, following TWP construction, the restored TWP site will drain in the same manner and at generally the same rate as it did before construction. Areas disturbed for water tank and pump station sites that are not designated for infrastructure, such as tank/forebay, buildings, parking and access areas, and equipment will be revegetated where appropriate after construction. Restored vegetation will be comparable to existing vegetation. Certified weed -free seed mix consisting of drought -tolerant native grasses and other types of vegetation as appropriate to meet property owner's reasonable preferences and regulatory requirements will be specified in the SWMPs for the revegetation of disturbed areas. Disturbed mature vegetation will be replaced, per a property owner's reasonable request, with a like species. Potential future repairs and maintenance could affect discrete areas of vegetation so that the water pipeline and appurtenances may be accessed in a particular location. Vegetated areas disturbed during maintenance or repairs will be restored by the methods used during construction. No permanent stormwater facilities are anticipated to be required for the water pipeline and water tank; drainage narratives are provided in Section 16 and Volume 4. Preliminary drainage reports have been developed for the pump station locations and those reports are included in Section 16. Based on the preliminary analysis, detention ponds are anticipated to be required at the pump station sites and preliminary siting of stormwater facilities are shown on the USR maps and are presented in Section 16. Stormwaterfacilities will be designed and constructed in accordance with Weld County and other requirements as applicable. If used by the TWP contractors and in accordance with Weld County staff recommended conditions of approval, drainage narratives for staging areas will be submitted before start of construction. Groundwater Information Overview of Groundwater Aquifers The TWP is located within the Lower South Platte River Basin, which comprises the northeastern quarter of Colorado, east of the Front Range urban corridor, as shown in Figure C.2.c.3 The major aquifers in the Lower South Platte River Basin are unconsolidated alluvial aquifers associated with the South Platte River and its tributaries, the Denver Basin aquifer system and the Dakota -Cheyenne aquifer. The TWP crosses through the Lower South Platte River Alluvium, which is specifically associated with the Lower South Platte River and its tributaries including Saint Vrain Creek, Little Thompson River, Little Dry Creek and Big Dry Creek. The TWP crosses through the Upper South Platte River Alluvium, which is specifically associated with the Cache la Poudre River. Groundwater levels vary along the TWP within Weld County with groundwater levels being higher around surface water sources such as unlined ditches, canals, reservoirs, lakes, and rivers and lower in areas farther away from surface water sources. In general, along the Interstate 25 corridor, where the TWP crosses the Lower South Platte River alluvium and other surface water sources, groundwater is anticipated to be less than approximately 20 feet below ground surface as identified in the Groundwater Atlas of Colorado, Special Publication 53 (Topper, Spray, Bellis, Hamilton, & Barkmann, 2003). Along the other stretches of the, groundwater is generally expected to be found at depths greater than 20 feet below ground surface, although, as mentioned previously, higher groundwater levels may exist near surface water sources. The typical depth of bury for the water pipeline will be a minimum of 4 feet below grade. During the design phase, the depth to TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-25 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION FIGURE C.2.C.3 South Platte River Basin and Associated Alluvial Aquifers TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-26 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION groundwater along the TWP will be further identified and monitored through geotechnical investigations. Construction and Long Term Mitigation Measures Mitigation measures that could be implemented with the TWP to minimize impacts to groundwater include the following: • Installation of trench plugs constructed of impervious materials such as bentonite, other clays, or controlled low -strength material within the water pipeline trench. Trench plugs serve as dams that mitigate groundwater flow paths that could develop through typical water pipeline bedding material. Trench plugs could be installed periodically along and perpendicular to the water pipeline to deflect flow into native ground to maintain the natural hydrology. + Installation of an impervious water pipeline trench backfill material such as bentonite, other clays, or controlled low -strength material to mitigate groundwater levels and groundwater flow paths. + Compacting backfill material and soil disturbed during trenching. Compact with a backhoe, vibration machine, rollers, or other equipment. Compaction requirements and testing would be specified in accordance with standards of practice. + Installation of porous backfill material to allow natural groundwater flow paths to flow around the water pipeline. + Dewatering groundwater in trench excavation prior to water pipeline installation. Groundwater encountered in the excavations will be addressed in accordance with CDPHE regulations and the requirements of the construction dewatering permits. Groundwater is likely to be collected and pumped into either temporary retention ponds, land applied, or routed to appropriate storm drains in accordance with the dewatering permits. Additional example BMPs and descriptions that could be used on the TWP are provided for reference in Appendix C. The mitigation measures to be implemented will be specified in the construction documents and will be developed as part of the design process, including evaluation of geotechnical investigations. C.2.d. An outline of the planned construction, including startup and commissioning schedule, to include the number of stages and timing of each. This section addresses WCC Section 23-2-510 C.2.d, and the USR Questionnaire, Planning 1.n. The TWP will be designed and constructed in multiple construction packages. Design activities will include: • Engineering site assessments: o Environmental o Cultural resources o Subsurface utility investigations o Subsurface geotechnical investigations • Land surveys + Property owner meetings Construction activities for TWP are proposed to begin in 2020 and end in late 2024/early 2025, and operation of the TWP system is scheduled to begin in 2025 after construction of all TWP packages TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-27 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION are complete. Construction activities have begun in incorporated areas of Weld County. Work on multiple construction packages will occur concurrently. Construction of each water pipeline construction package is anticipated to last approximately 2 to 2 %z years, not including revegetation activities. Construction of the water tank is expected to last approximately 1 year, and construction of the pump stations is expected to last 2 years. Contractors will be selected after design activities are complete. The TWP contractors will be required to prepare a detailed schedule for their respective packages and this can be provided to Weld County. The timeline for the TWP extends from 2016 for permitting development to 2025 for startup operations. Figure C.2.d.1 presents the general timeline for major activities. FIGURE C.2.d.1 TWP Timeline for Weld County Water Pipeline Construction Activities The TWP will be constructed in multiple construction packages. Construction activities for TWP are proposed to begin in 2020 and end in late 2024/early 2025, and operation of the TWP system is scheduled to begin in 2025 after construction of all TWP packages are complete. Construction activities have begun in incorporated areas of Weld County. Work on multiple construction packages may occur concurrently with multiple crews of 10 to 25 workers each. At the peak of construction, approximately 80 to 100 workers could be required and will be working at multiple sites along the TWP. Construction work hours will typically be from 7 a.m. to 7 p.m. Monday through Saturday unless otherwise approved by Weld County. Construction may extend beyond these hours on an as - required and case -by -case approved basis. For example, some construction activities, such as hydrostatic testing, require 24/7 operation, and shift work may be required. However, shifts are not anticipated for construction on a day-to-day basis. The following are major activities involved in construction of water pipelines in typical sequence: • Traffic control installation • Survey • Stormwater BMPs and access installation • Site clearing • Stage materials/staging area setup TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C 28 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • Locate existing utilities • Excavate the water pipeline trench/bore pit • Water pipeline installation • Backfill the trench/bore pit • Conduct pressure testing • Clean up • Restore ground surface • Road restoratior • Revegetation • Ongoing stewardship Figure C.2.d.2 shows some of the typical construction activities that occur within the work limits. Work limits include the permanent and temporary construction easements and the Weld County approved ROW. FIGURE C.2.d.2 Construction Activities Traffic Control Installation This section addresses the criteria described in WCC Sections 23-2-480 A.5 and 23-2-490 E. Where the water pipeline location is in ROW, as approved by Weld County, traffic control measures will be implemented before work starts in the ROW. Thornton places a high priority on safety during construction. The TWP contractors will implement traffic management plans based upon local traffic control requirements and general safe operating practices. Thornton and/or the TWP contractors will develop traffic control plans that include adequate levels of service and safety measures for construction. Proper signage, flaggers, lighting, speed limits, work hours, postings, notifications, and other precautionary safety measures will be taken to protect the residents of Weld County and the TWP contractors' err•ployees. Access will be maintained to local area residents. Emergency vehicle access needs will be maintained and construction activities coordinated with local fire departments, police departments, ambulance services, other emergency responders, and school districts as necessary. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C 29 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Survey The water pipeline location will be surveyed and staked to ensure that the water pipeline will be installed as indicated in the contract documents. Work limits will also be surveyed to establish the boundaries that the TWP contractors are allowed to work in. Work limits include the permanent and temporary construction easements and Weld County approved ROW. Storm water BMPs and Access Installation This section addresses the criteria described in WCC Sections 23-2-480 A.8 and 23-2-490 H. Surface drainage stormwater BMPs will include application of erosion control techniques and the successful revegetation of disturbed areas. The required Weld County grading permit and CDPHE construction stormwater permits and SWMPs will include detailed descriptions of BMPs that will be used to protect surface hydrology and water quality. Thornton has met with Weld County Public Works staff to coordinate access locations from existing Weld County roads. Thornton's TWP contractors will obtain access permits from Weld County or other agencies for any necessary temporary or permanent access locations as applicable. Stabilized construction entrances/exits will be installed for access from existing roads. Site Clearing After stormwater BMPs are in place, ground disturbing activities will commence. This includes clearing and grubbing the site. As applicable, pavement and vegetation will be removed from the site and will be properly disposed of. If top soil exists, it will be removed and stockpiled separately away from other excavated material. Surface disturbance will be limited to ROW approved by Weld County, and the permanent and temporary easements. Stage Materials/Staging Area Setup At this time, Thornton anticipates using 13 temporary staging areas within unincorporated Weld County during construction of the TWP. TWP contractors will determine final areas needed for staging. Each staging area is anticipated to occupy not more than 1 acre of land. Staging areas will be used for material storage, parking, equipment storage, field offices, and storage of excavated materials. Parking and vehicle storage during construction will be primarily on property within the permanent or temporary easement, at temporary staging areas, or on land owned by Thornton. Thornton plans to off-load and temporarily store (string) the water pipe along the easement as it is delivered when possible to reduce the number of trips required for material delivery until the water pipe is placed in its permanent buried location. If needed, stockpiling of water pipe could take place within the temporary and permanent easement or at temporary staging areas. Stockpiling in lieu of stringing the water pipe will only be conducted where additional space is required. Preliminary anticipated staging locations in unincorporated Weld County are shown on Figure C.2.d.3a and Figure C.2.d.3b. Some of these areas could be used for stringing water pipe or as temporary staging areas. Thornton or TWP contractors will negotiate with property owners or agencies for the short-term use of temporary staging areas. The TWP contractors could negotiate agreements with property owners for additional staging areas if additional area is required for construction operations as determined by the TWP contractors. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-30 Thornton Water Project 1 HIV 1 t r -r TRIL ..50TH ST "CE I lem • CR 10 Thornton v,n', :+- CITY OF THORNTON COLORADO 12450 WASHINGTON ST • AI- 0 0.875 JOHNSTOWN 1.75 Miles BERTHOUD TVVP in Unincorporated Weld County TWP outside Unincorporated "" Weld County County Boundary S Railroad River/Stream/Canal/Ditch Lake/Reservoir Potential Staging Location t 2 CR 46 Figure C.2.d.3a Potential Staging Locations THORNTON, CO 80241-2405 1/22/2021 1 inch = 1.75 miles WM76066_THORNTON_ NORTHERN_PRO..ECT%TASK_ORDER__aERM''T iNGYGISNAAPF1t.ESNNELO USRtRESOURCE_MAPSPERMITAPP_202IWOTENTiAL_STAGiNG_LOCATIONSMX0 AUAN'122J2021 t 0526 AM Sources USGS NHD COMA Weld County, COOT Thornton Water Project Thornton Y.AT1_1i P!C.:ECT CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241.2405 0 S 0.875 1.75 TWP in Unincorporated Weld County TWP outside Unincorporated Weld County County Boundary Railroad River/Strearn/Canal/Ditch Lake/Reservoir n Potential Staging Location n f LONGS PEAK -ST BUSH ST BASELINE RD - • ?' " OR Tj.: BR IDG E ST ~-a Figure C.2.d.3b Potential Staging Locations 1/22/2021 1 inch = 1.75 miles Miles Sources USGS, NHD. CDWR, Woo County, CDOT W M78968 THORNTON NORTHERN PROWECTITASK ORDER 5151 PERMITTINGIGISMAPFILES1WELD USRIRESOURCE MAPSIPERMITAPP 2021%POTENTIAL STAGING LOCATIONS MXD MAN '1271202''105.26AM THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Locate Existing Utilities TWP contractors will call the Utility Notification Center of Colorado (UNCC) as required before any excavation. Excavate the Water Pipeline Trench/Bore Pit It is anticipated that excavated material will be temporarily stored within the permanent or temporary easement adjacent to the trench. Topsoil will be stripped and stored separately from excavated trench materials. If additional space is required, excavated materials could be stored in temporary staging areas. Water Pipeline Installation This section addresses the criteria described in WCC Sections 23-2-480 A.7 and 23-2-490 G. It is anticipated that both open -cut and trenchless construction methods will be used for water pipeline installation. Whether employing open -cut or trenchless construction methods, the installation and construction methods employed will follow standard industry practices designed to produce a safe, environmentally sound, and quality operation. For open -cut construction, the water pipeline trench is anticipated to be a minimum of S %z feet deep with an approximate top width of approximately 19 feet. The top of the water pipeline will sit at least 4 feet below the final grade. A typical trench profile and easement section abutting future road ROW is shown in Figure C.2.d.4. 100' (MAJOR COLLECTOR) 120' (ARTERIAL) FUTURE PLANNED ROW 60' (ARTERIAL) 50' (MAJOR COLLECTOR) CL TO FUTURE ROW 60' CURRENT ROW (TYP) 30' CL TO CURRENT ROW TYP - CENTERLINE (CL) ROAD PROPERTY LINE - - t' U 40' TEMPORARY CONSTRUCTION EASEMENT 50' PERMANENT EASEMENT 27' 28' 30' EXCAVATED CONSTRUCTION MATERIAL OPERATIONS 1 TRENCH SLOPE 1:1 TO 1.5:1 WATER PIPELINE 25' 16-20' VARIES U 15'-1T PIPE STAGI NG PIPE CL 4'-5' PIPELINE BURY DEPTH. MIN 8' TYP 9'-6" TYP FIGURE C.2 d.4 Example Open -Cut Construction Section Trenchless construction methods could include methods such as tunneling or auger boring techniques to install the water pipeline. This means of construction is used to minimize ground TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-33 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION disturbance at locations such as environmentally sensitive areas including WOTUS (jurisdictional waters), irrigation ditches and at road crossings not allowed by Weld County to be open cut. After BMP installation, clearing and grubbing, and delivery of materials to the tunneled location, a bore pit will be excavated on one side of the area to be tunneled and a receiving pit will be excavated on the opposite side. The water pipeline will be tunneled from the bore pit to the receiving pit. It is anticipated that the water pipeline will typically be installed inside a steel casing pipe that is itself installed using trenchless construction methods. The casing pipe will be approximately 12 to 18 inches larger in diameter than the water pipeline and will normally be buried at a depth approximately 2 times the diameter of the casing, which will be approximately 10 to 11 feet below the lowest final grade elevation. Settlement monitoring will be conducted along the trenchless route to confirm that settlement has not occurred. Thornton will consult with affected property owners, Weld County, and applicable agencies such as the U.S. Army Corps of Engineers (USACE) to determine where trenchless construction methods are needed. Table C.2.d presents the probable water pipeline installation construction methods that are expected to be utilized at existing features. TABLE C.2.d Probable Water Pipeline Construction Method at Defined Existing Features Existing Feature Crossing Probable Water Pipeline Comment Installation Construction Method Jurisdictional Waters Trenchless Construction Federal Interstates and Trenchless Construction Colorado Highways Irrigation Ditches Open -Cut or Trenchless as Directed by the Ditch Company or Other Requirements Weld County Paved Roads Trenchless as Required by Weld County Weld County Gravel Roads Driveways within Property Existing Utilities Floodplains Open -Cut Construction Open -Cut or Trenchless as Negotiated with Property Owner Open -Cut Construction Open -Cut Outside Jurisdictional Waters and Trenchless within Jurisdictional Waters USACE will be consulted before construction, and concurrence with USACE will be obtained that no permit is required for crossing. A Colorado Department of Transportation Utility/Special Use Permit will be obtained before construction. Crossing agreements will be obtained from the ditch company. Coordination with the ditch owner will take place to minimize impacts to ditch operations. Weld County approval and permits will be obtained before construction. The TWP will adhere to Weld County standards. Weld County approval and permits will be obtained before construction. The TWP will adhere to Weld County standards. Timing of constructing driveway crossings will be coordinated with property owner. License agreements/permits will be obtained as required from utility owner. Minimum clearance requirements will be determined during final design. Floodplains typically extend outside the jurisdictional water (ordinary high water mark). Areas outside the jurisdictional water could be constructed using open -cut construction methods. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-34 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Backfill the Trench/Bore Pit After the water pipeline is installed, the trench/bore pit will be backfilled using appropriate backfill materials and compaction techniques, including use of a backhoe and vibration equipment to obtain proper soil compaction. Conduct Pressure Testing Hydrostatic pressure testing will be completed to verify that the water pipeline is capable of withstanding the designed maximum allowable operating pressure. It is anticipated that the water pipeline will be tested in sections. Where feasible, hydrostatic test water will be routed from one section of the water pipeline to another to recycle that water. Clean Up Clean up of areas disturbed during construction will be conducted before final grading and revegetation. Clean up includes removing: • BMPs not needed for revegetation activities + Excess materials • Temporary fencing, if used • Temporary facilities + Large stones and other debris Restore Ground Surface Land will be restored to pre -construction grades. Road Restoration ROW will be restored to pre -construction conditions and in accordance with Weld County standards or other standards as applicable. Revegetation Disturbed areas will be revegetated after construction where appropriate. Restored vegetation will be comparable to existing vegetation. Certified weed -free seed mix consisting of drought -tolerant native grasses and other types of vegetation as appropriate to meet property owner's reasonable preferences or regulatory requirements will be specified in the SWMP for the revegetation of disturbed areas. Disturbed mature vegetation will be replaced, per a property owner's reasonable request, with a like species. Ongoing Stewardship Surface areas disturbed by construction will be monitored after construction and Thornton will continue to maintain the site until the area is restored to meet property owner's reasonable preferences and regulatory requirements. Water Tank and Pump Station Construction Activities Water tank and pump station construction activities are similar to water pipeline construction activities and include traffic control installation, survey, stormwater BMPs and access installation, site clearing, stage materials/staging area setup, located existing utilities, clean up, restore ground surface, revegetation, ongoing stewardship. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-35 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION After stage materials/staging areas are setup, excavation and construction of structure foundations will occur, followed by framing and construction of superstructure and construction of permanent driveways, access, parking and stormwater facilities. Inspections as required by building permits or other requirements will take place as construction progresses. C.2.e. Information of any public meeting conducted, to include the location, date, time, attendance and method of advertising. This section addresses WCC Sections 23-2-510 C.2.e and 23-2-470 B.4 and Procedural Guide Checklist, community meeting (optional). Public Outreach Public outreach includes Open Houses, a TWP website, TWP e-mail address, and TWP phone line, and stakeholder outreach. See Appendix E for additional information on public outreach and Appendix B for additional information on stakeholder outreach. Open Houses Public outreach is not required by Weld County's USR permit application process. However, to introduce the public and potentially affected property owners to the TWP, respond to questions, and to collect input from the public and potentially affected property owners, the following Open Houses were held in Larimer and Weld Counties: • November 14, 2016 at Southwest Weld Services Complex, 4209 Weld County Road 24 %2, Longmont • November 16, 2016 at Poudre Valley REA, 7649 REA Parkway, Fort Collins • December 6, 2016 at Larimer County Courthouse, 200 West Oak Street, Fort Collins + December 8, 2016 at Johnstown Senior Center, 101 Charlotte Street, Johnstown A total of 1,270 invitations to the Open Houses were sent to Weld County and Larimer County property owners within the initial proposed corridor and within Weld and Larimer County's major land use permit notification areas. Of the invitations sent, a total of 423 Weld County property owners within the initial proposed corridor and within 150 feet of the initial proposed corridor were mailed invitations analogous to WCC Section 23-2-470B.5, notice of application to surrounding property owners within 150 feet. Invitations were also sent to local municipality representatives. After the first two Open House events, a second invitation was sent to remind invitees that two Open Houses were still forthcoming. A total of 146 attendees signed in and provided addresses at one or more of the four Open Houses. Display boards and maps that included information on the following topics were exhibited at the Open Houses: • Overview + Purpose and Need • History • Timeline + Permitting • Land Acquisition + Construction + Corridor Maps TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-36 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Frequently asked questions and land acquisition brochures were available. Open House attendees were offered comment forms to provide feedback regarding route alternatives, project concerns and suggestions, and general comments. Attendees were given the opportunity to sign up for TWP updates. The majority of attendees were interested in reviewing the initial proposed corridor. Large maps were exhibited by the TWP Team so that attendees could identify where the initial proposed corridor was located in proximity to their property and how the TWP could affect them. It was explained that the final alignment has not yet been developed and that one of the objectives of the Open Houses was to obtain feedback from attendees. Open House documents can be found in Appendix E. TWP Website, TWP E-mail, and TWP Phone Line Public outreach is not required by Weld County's USR permit application process. However, to introduce the public and potentially affected property owners to the TWP, the TWP website, TWP e- mail address, and TWP phone line (www.ThorntonWaterProject.com, info@ThorntonWaterProject.com, and 720-977-6700) launched on October 28, 2016. The website, e-mail, and phone line provide opportunities for questions and the collection of input from the public and potentially affected property owners. Stakeholder Outreach In an effort to determine the alternative corridor least impactful to local communities in Northern Colorado, Thornton, in 2015, conducted a series of outreach meetings with local governments and agencies that could be impacted by the TWP. During the initial outreach meeting with each local government and agency, feedback was collected to determine preference(s) and/or determine potential problems for the location of the water pipeline within the local government or agency's jurisdictional and/or GMA boundaries. For information on the TWP corridor development process, see Appendix F. Secondary outreach meetings were conducted with local governments and agencies that had incorporated areas or GMAs overlapping alternative corridor locations to present the initial three alternative corridors. During this second round of outreach, additional feedback was collected from the local governments and agencies and, as a result, a fourth alternative corridor, was developed as the local government's preferred corridor. Outreach meetings were conducted with the following local governments: • Berthoud + Dacono + Firestone • Fort Collins + Frederick • Greeley • Johnstown + Larimer County • Loveland • Mead TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-37 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • Milliken • Timnath + Weld County • Wellington + Windsor Thornton has been in discussions with USACE beginning in 2014 to provide information on the TWP to USACE staff. Thornton will continue consulting with USACE and plans to submit a jurisdictional determination request to USACE before completing design activities to determine which areas in the TWP are jurisdictional waters. Design will include trenchless construction methods at jurisdictional water crossings. Additional outreach and coordination activities included: • Meetings with local major utility providers + Meeting with the CDOT • Meeting with Colorado Parks and Wildlife (CPW) + Meeting with Great Western Railroad + Presenting the TWP at the Energy Industry Working Group (Weld County oil and gas companies) on December 15, 2016 + Sending letters to initiate coordination activities to local irrigation and ditch companies, utility providers, wildlife agency outreach (CPW and U.S. Fish and Wildlife Service [USFWS]), and local fire districts Thornton will continue coordinating with stakeholders and will obtain license agreements and permits as appropriate. Stakeholder outreach information is included in Appendix B. C.2.f. A description of the hazards, if any, of fire, explosion and other dangers to the health, safety and welfare of employees and the general PUBLIC. This section addresses WCC Section 23-2-510 C.2.f and the USR Questionnaire, Planning 7, Environmental Health 2, 4, 5, and the criteria described in WCC Sections 23-2-480 A.5 and 23-2-490 E. Environmental Hazards Thornton and the TWP contractors will provide and maintain sanitary accommodations for the use of their employees during construction of the TWP in a manner that complies with the requirements and regulations of health departments and other governmental bodies. These accommodations, including trash dumpsters, will be located in several locations along the TWP alignment based on the general plan for construction. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws and regulations. Construction waste will be stockpiled in construction staging areas and removed from the construction site during the construction process. Trash dumpsters will be emptied approximately every 1 to 2 weeks. The TWP will not include the need for permanent dumpsters as the water tank, pump stations, and underground water pipeline will be unmanned. Construction, operation, and maintenance activities will follow best management practices for the management of wastes to avoid and minimize impacts from potential spills or other releases to the TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-38 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION environment. These practices are discussed in greater detail below. Adverse impacts from the release of construction or operations wastes are not expected. Hazardous Materials and Waste Management Mitigation Measures Construction activities involving Thornton or the TWP contractors bringing any hazardous materials onto the site will comply with applicable federal, state, and local laws and regulations regarding the handling, storage, disposal, transportation, and use of hazardous substances. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws. Fueling Mitigation and Safety Measures TWP Construction If possible, fueling requirements will be met before arrival at the construction site. Heavy equipment left on site for construction activities will require onsite fueling at staging areas or the construction site. No bulk fuel storage is anticipated to occur on site. Fueling vehicles will be equipped with spill kits and fire extinguishers, and personnel will be properly trained in spill prevention, control, and countermeasures. To minimize the potential for a spill during fuel transfers and be prepared in the event of a spill, the following measures, as provided in the CCR and CFR, will be followed during loading/unloading of fuel: • Keep fire away while loading/unloading. Persons in the vicinity are forbidden to smoke, light matches, or carry any flame or lighted cigar, pipe, or cigarette. 49CFR 177.834(c, d). • Fuel will not be loaded/unloaded from any motor vehicle while the engine is running. The exception is when the engine of the vehicle is to be used in the operation of the pump. 49CFR 177.837(a). • The fuel tank records will be reviewed to determine the theoretical fuel tank level. 7CCR 1101- 14 52-3-1 and S2 -4-2(a)(2.) + The fuel tank level gauge will be inspected to determine the actual fuel tank level before unloading takes place. (Note: Any fuel tank level discrepancies will be resolved before hooking up to the fuel tank.) 7CCR 1101-14 52-3-1 & 52-4-2(a)(2). • The supply truck driver will observe the transfer during the entire operation. 49CFR 177.834(i)(2). + Once the truck is in position, its emergency brake will be applied and reasonable precautions will be taken to prevent motion of the truck during unloading (example: utilize wheel chocks when parked on an incline). 49CFR 177.834(e). + Signs must be posted that remind drivers not to pull away before detaching hoses. 40CFR 112.7(h)(3). + Containers and cargo tanks will be grounded before and during transfer. 49CFR 177.837(b) & (c). + The transfer line must be properly disengaged, and the valves and piping of both the fuel tank and truck must be checked for leaks before allowing the truck to leave the site. (40CFR 112.7 h(4) for trucks). TWP Post -construction If feasible, backup power for the pump stations will be provided by a second electrical feed from the applicable utility provider. Should a second electrical feed not be available, or require significant improvements to the utility grid, backup diesel generators will be installed at both pump stations. The amount of fuel stored will be that required for 36 hours of operation at full load. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-39 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION At Pump Station 1, three 2 -MW diesel generators with approximately 4,150 -gallon underbelly tanks will be installed, if required. In this arrangement, approximately 12,500 gallons of diesel fuel will be stored onsite. At Pump Station 2, three 2 -MW diesel generators with approximately 4,150 -gallon underbelly tanks will be installed, if required. In this arrangement, approximately 12,500 gallons of diesel fuel will be stored onsite. The following measures will be followed for installation and operation of diesel fuel storage installed as part of any emergency generators included with the pump stations: + Location of fuel tanks will comply with required separation distances. 7CCR 1101-14 S3-2-2-4 • Application for Permit for Above Ground Storage Tank (AST) will be submitted and obtained for installation of diesel fuel storage tanks. 7CCR 53-2-3 • Spill and overfill protection will be provided during operation, including secondary containment equal to or greater than the volume of diesel fuel being stored. 7CCR 1101-14 S3-3-1 + Release detection will be provided. 7CCR 1101-14 53-3-3 Testing and compliance inspections will be completed per applicable code(s). 7CCR 53-3-4 Traffic and Roads and Mitigation Measures Impacts caused by construction equipment and activity on Weld County roads will be short term during construction. Access will be maintained for local area residents. Emergency vehicle access needs will be maintained and construction activities coordinated with local fire departments, police departments, ambulance services, and other emergency responders as necessary. Thornton places a high priority on safety during construction. Thornton will coordinate with local school districts regarding construction and haul routes and school bus traffic. TWP contractors will implement traffic management plans based upon local traffic control requirements and general safe operating practices. Proper signage, flaggers, lighting, speed limits, work hours, postings, notifications, and other precautionary safety measures will be taken to protect the residents of Weld County and the TWP contractors' employees. The water pipeline construction will utilize trenchless construction methods under Weld County roads where required by Weld County, resulting in little to no disruption to traffic at those locations. Temporary traffic delays and detours will be needed where the water pipeline is installed by open - cut construction across existing roads. Traffic disruption will be temporary, and will cease after construction. Traffic control plans will be implemented before construction, subject to approval and acquisition of permits from Weld County Engineering. If open -cut construction is approved by Weld County at road crossings, Table C.2.f presents the number of anticipated days to construct the water pipeline and restore ROW for various road functional classifications. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-40 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE C.2.f Anticipated Water Pipeline Construction and Restoration Times for Open -cut Method for Road Crossings Road Classification ROW Road Surface Anticipated Anticipated Anticipated Length Closure Number of Days Number of Days for Water Pipeline for ROW Installation Restoration Local Local Collector Collector Arterial 60 Gravel Full 60 Paved Full 80 Gravel Partial 80 Paved Partial 140 Paved Partial 2 2 2 2 3 2 2 2 3 3 Additional information and mitigation measures are presented in Section 17, Traffic Narrative. Operations One of the greatest risks to buried pipelines is excavation by individuals unaware of the location of a pipeline. Pipeline markers will be installed in the pipeline permanent easement to indicate that a water pipeline is buried nearby. The markers will identify the water pipeline, Thornton as the pipeline operator, the operator's 24 -hour emergency contact number, and the area's utility notification number. Marking tape indicating that a water pipeline is buried in the location will also be installed above the water pipeline for the entire length of the water pipeline. The majority of the water pipeline in unincorporated Weld County will be located within permanent easements. This approach reduces the probability that individuals could damage the water pipeline with ground - disturbing activities. The water pipeline will be designed and constructed to be water tight. Pipe materials will be required to undergo shop testing before installation as well as hydrostatic field testing after installation. The water pipeline and appurtenances will be coated and lined to prevent corrosion. As an additional safety measure, project components will be installed with cathodic protection, which will control the corrosion of a metal surface. Cathodic protection systems are commonly used to protect metallic water pipelines. C.2.g. A description of emergency procedures to be followed in case of a reported failure or accident involving the proposed PIPELINE — DOMESTIC WATER. Such outline shall include actions, if any, required of PUBLIC officials, including fire and police officials, and the names and telephone numbers of appropriate Company officials to notify in an accident or failure should occur. This section addresses WCC Sections 23-2-510 C.2.g, Procedural Guide Checklist, emergency incident action plan, and the criteria described in WCC Sections 23-2-480 A.5 and 23-2-490 E. Thornton owns and operates an extensive network of water pipelines that deliver raw and finished water to Thornton facilities and customers in residential and business areas. Providing reliable water requires that Thornton have quick access to parts and equipment to maintain or repair pipelines and TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-41 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION related facilities, and the same will apply to the TWP. The TWP pump stations will include emergency automatic shutdown control. Pump stations will undergo automatic controlled shutdown if a sudden pressure drop or increase occurs or sudden changes in water tank levels occur that indicate a water pipeline break, valve closure, or blockage. Pipeline markers will be installed in the pipeline permanent easement to indicate that a water pipeline is buried nearby. The markers will identify the water pipeline, Thornton as the pipeline operator, the operator's 24 -hour emergency contact number, and the area's utility notification number. Marking tape indicating that a water pipeline is buried in the location will also be installed above the water pipeline for the entire length of the water pipeline. The operator at Thornton's Wes Brown Water Treatment Plant will be the emergency point of contact. The Wes Brown Treatment Plant is manned 24 hours a day, 7 days a week, 365 days a year and the telemetry for the TWP will be monitored at this location. Wes Brown Water Treatment Plant 3651 East 86th Avenue. Thornton, CO 80229-5201 Phone: 303-255-7720 The operator will be trained, qualified in day to day operation of the water pipeline and associated facilities, and in emergency response procedures. Administration of system shutdown will be feasible from the Wes Brown Water Treatment Plant and at the TWP pump stations. The operator will be able to monitor the operation of the water pipeline, pump stations, and other infrastructure. Monitoring of key parameters including pressures, flow rates, and water levels will occur. If these parameters, or other critically identified criteria fall outside of pre -determined normal operating allowances, warnings will be raised of potential operational upsets or pending emergency conditions, providing the operator with time to make corrections, if possible, to the system operation to clear the warning. If specified parameters, or critically identified criteria reach pre- determined set points within the system operation, automatic shutdown will occur. Dispatch of trained personnel to the site of the emergency will occur as needed and depending on the nature of the emergency, local emergency responders will be notified. Additional information is included in Section 22. If required, the water pipeline will be drained at blow -off assemblies and system repairs will be made as soon as feasible. Any vegetated areas disturbed during required repairs will be restored by the methods used during construction. The TWP contractors will develop a safety plan that will include an emergency response plan for the construction phase of the TWP. The plan will be written to include identification of emergency response agencies near the TWP area, including how and when to communicate with emergency responders as applicable. C.2.h. A description of the method or procedures to be employed to avoid or minimize the impacts on irrigated agricultural land. This section addresses WCC Section 23-2-510 C.2.h and the criteria described in WCCSections 23-2-480 A.1 and 23-2-490 A, and USR Questionnaire, Planning 6. Criteria used for developing the water pipeline location included minimizing impacts to agricultural use. Thornton's land agents have worked with property owners along the water pipeline alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-42 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION routing the water pipeline to minimize affecting the operation of irrigation equipment. The process to develop the water pipeline route was iterative, and are a result of negotiations with individual property owners or detailed land, utility, or resource surveys that revealed engineering or environmental constraints. Thornton's land agents negotiate the purchase of easements where needed based on fair market value. The easements will grant Thornton an area to construct, operate, and maintain the water pipeline, and property owners will maintain fee title to the land. Property owners can continue to use the land within the easement area for purposes such as farming, grazing, or access, so long as such uses do not interfere with or endanger the operation of the TWP. The predominant land use in the TWP area, agricultural use, is compatible with operation of the TWP because the water pipeline and fiber optic cable will be buried below the plow line. Additional measures that will be implemented to minimize impacts to irrigated agricultural land include: • Stripping and storing topsoil separately from excavated trench materials • Seeding or leaving land fallow in accordance with the individual property owner's agreed -upon reclamation procedures following construction of the water pipeline The TWP will cross multiple irrigation ditches along the water pipeline route within unincorporated Weld County as presented in Section 6. Thornton has begun outreach to each irrigation ditch company to begin coordination activities. See Appendix B for additional information on stakeholder outreach. As part of the negotiation process for acquiring easements, Thornton's land agents coordinate with property owners on lateral ditch crossings to limit impacts to agricultural operations. Thornton will obtain appropriate agreements for each crossing before construction. No direct effects on water flow, quantity, quality, or timing in the irrigation ditches are anticipated. Crossings will be constructed using either trenchless or open -cut methods as required by the irrigation ditch company and during times the ditch is not running, if required. C.2.i. A discussion of how the proposal conforms with the guidelines of Chapter 22 of this code and any other applicable code provision or ordinance in effect. This section addresses WCC Section 23-2-510 C.2.i, and the USR Questionnaire, Planning 2, 3, 4, 5, 6, Environmental Health 1, 2, 8, and the criteria described in WCC Sections 23-2-480 A.1 through 23-2-480 A.8 and 23-2-490 A through 23-2-490 H. The water pipeline and most appurtenances will be buried with limited above ground equipment. There will be limited effects to the rural character of Weld County. The water tank and pump stations will be above ground infrastructure and will be constructed on land on which Thornton has acquired fee title interest. Thornton will construct the TWP in a manner consistent with existing and planned land uses in Weld County. Thornton is committed to cooperating and coordinating with the agricultural community and industrial and municipal land owners in the vicinity of the TWP. On November 23, 2020 Chapter 22, Comprehensive Plan (Comprehensive Plan 2020) became effective. The Application and Supplemental Permit Application (Supplement 1) were developed under the WCC, Chapter 22, Comprehensive Plan adopted in 2008 (Comprehensive Plan 2008). This section includes a discussion on how the TWP conforms with Comprehensive Plan 2008 followed by a discussion on how the TWP conforms with the Comprehensive Plan 2020. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-43 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Comprehensive Plan 2008 Conformance 2008 Guiding Principles Comprehensive Plan 2008 is intended to be used for the general purpose of guiding and accomplishing the coordinated, adjusted and harmonious development of Weld County. Thornton intends to comply with the guiding principles of the Comprehensive Plan 2008 relevant to the TWP. Private Property Rights Thornton has purchased easements and land through good -faith negotiations with property owners, and only used eminent domain when all other reasonable options have been explored. Thornton's land agents have worked with property owners along the TWP alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to limit impacts to the operation of irrigation equipment, structures, trees, and other infrastructure. The process to develop the water pipeline route was iterative, and is a result of negotiations with individual property owners, or is a result of detailed land, utility, or resource surveys that revealed engineering or environmental constraints. The TWP is developed in a manner that is respectful of private property rights. Respect for Agriculture Tradition Criteria used for developing the water pipeline location included minimizing impacts to agricultural uses. Thornton's land agents have worked with property owners along the water pipeline alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to minimize affecting the operation of irrigation equipment. The process to develop the water pipeline route was iterative, and is a result of negotiations with individual property owners or detailed land, utility, or resource surveys that revealed engineering or environmental constraints. Thornton's land agents negotiated the purchase of easements where needed based on fair market value. The easements will grant Thornton an area to construct, operate, and maintain the water pipeline, and property owners will maintain fee title to the land. Property owners can continue to use the land within the easement area for purposes such as farming, grazing, or access, so long as such uses do not interfere with or endanger the operation of the TWP. The predominant land use in the TWP area, agricultural use, is compatible with operation of the TWP because the water pipeline and fiber optic cable will be buried below the plow line. Additional measures that will be implemented to minimize impacts to irrigated agricultural land include: + Stripping and storing topsoil separately from excavated trench materials + Seeding or leaving land fallow in accordance with the individual property owner's agreed -upon reclamation procedures following construction of the water pipeline The TWP will cross multiple irrigation ditches along the water pipeline route within unincorporated Weld County as presented in Section 6. Thornton has begun outreach to each irrigation ditch company to begin coordination activities. See Appendix B for additional information on stakeholder outreach. As part of the negotiation process for acquiring easements, Thornton's land agents coordinate with property owners on lateral ditch crossings to limit impacts to agricultural operations. Thornton will obtain appropriate agreements for each crossing before construction. No TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-44 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION direct effects on water flow, quantity, quality, or timing in the irrigation ditches are anticipated. Crossings will be constructed using either trenchless or open -cut methods as required by the irrigation ditch company and during times the ditch is not running, if required. Existing use, including agricultural use, in areas surrounding the water tank can continue. The site for Pump Station 1 is located on vacant land of which approximately 75 percent is leased for irrigated farming and the remaining 25 percent is not used. The site is part of a larger parcel used for irrigated agriculture and oil and gas development. Existing use, including agricultural use, in areas surrounding the pump station can continue. The site for Pump Station 2 is vacant land adjacent to County Road 17 and County Road 2 and is currently not being used, but in the past has been used for growing non -irrigated grass hay that was is cut for feed. Existing use, including agricultural use, in areas surrounding the pump station can continue. Fairness in the Land Use Change Procedure and Regulations Addressing Land Use Changes The TWP will not require any zone changes in unincorporated Weld County. Thornton is requesting a USR permit for the TWP, pursuant to WCC, Chapter 23, Article II, Division 6 USR Permits for PIPELINE— DOMESTIC WATER. The TWP involves a pipeline sixteen inches in diameter or larger and appurtenant components thereof (such as water tanks, valves or pump stations) designed for transporting domestic water in such pipeline and extending to locations outside of Weld County. Recognition of Weld County's Diversity The TWP represents a low -intensity land use that will be compatible with existing agricultural land use, low density residential development, open space, heavy industrial use, and other uses, and is otherwise compatible with Weld County's geographic, demographic, cultural, social and economic diversity. To determine the alternative corridor least impactful to local communities, Thornton, in 2015, conducted a series of outreach meetings with local governments and agencies that could be impacted by the TWP. During the initial outreach meeting with each local government and agency, feedback was collected to determine preference(s) and/or determine potential problems, including planned developments, for the location of the water pipeline within the local government or agency's jurisdictional and/or GMA boundaries. Outreach meetings were conducted with the following local governments: • Berthoud • Dacono + Firestone + Fort Collins + Frederick • Greeley • Johnstown + Larimer County + Loveland • Mead • Milliken TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-45 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • Timnath • Weld County • Wellington • Windsor Thornton recognizes that the energy industry is an essential industry in Weld County. As part of the coordination process for the TWP and to help minimize impacts to the energy industry, Thornton presented the TWP at the Energy Industry Working Group (Weld County oil and gas companies) on December 15, 2016. In addition, outreach letters have been sent to initiate coordination of activities to oil and gas companies. Coordination with oil and gas companies continued during the land acquisition process to lessen impacts to existing and planned infrastructure. Where feasible, the water pipeline easement overlaps nonexclusive oil and gas easements and the water pipeline will be located outside of the overlapping easement to minimize both property owner and oil and gas impacts. Economic Growth The TWP will not have a negative effect on the economic growth of local government or any other existing public facilities and services. The construction, operation, and maintenance of the underground water pipeline and appurtenances will not require any new public facilities or impact existing services such as police, fire, water, waste water, and healthcare. Thornton has purchased easements and land through good -faith negotiations with property owners and only used eminent domain when all other reasonable options have been explored. To determine the water pipeline route least impactful to local communities, Thornton, in 2015, conducted a series of outreach meetings with local governments and agencies that could be impacted by the TWP. During the outreach meetings with each local government and agency, feedback was collected to determine preference(s) and/or determine potential problems, including planned developments, for the location of the water pipeline within the local government or agency's jurisdictional and/or GMA boundaries. The TWP construction contractors will provide crews that are not anticipated to exceed approximately 100 workers at any one time. Some workers may reside outside of the local areas and will require lodging or temporary housing. The number of construction workers on site will depend on the contractors and the construction activity occurring during a particular time. Thornton will endorse hiring local workers. TWP contractors and construction workers will likely support local businesses to meet a need for durable and nondurable goods and services. 2008 Goals and Policies The Comprehensive Plan 2008 contains policies to guide land use within unincorporated areas of Weld County. Many of the policies are directed toward industrial development, commercial development, or other areas not directly related to the TWP. For this reason, the following discussion addresses only those land use and other policies relevant to the TWP. The information provided herein demonstrates that the TWP is consistent with the goals and policies of the Comprehensive Plan 2008. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-46 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION A. Goal 1. Respect and encourage the continuation of agricultural land uses and agricultural operations for purposes which enhance the economic health and sustainability of agriculture. The TWP, within unincorporated Weld County, is located in rural land use areas designated as agricultural, estate, and heavy industrial zoning. The water pipeline and fiber optic cable will be buried, and land use effects on agricultural and other similar use will be temporary during construction and are anticipated to be minimal after construction. Agricultural use within the permanent easement will be able to continue after construction so long as such uses do not interfere with or endanger the operation of the TWP. Figure C.2.ia and Figure C.2.ib show the zoning within the TWP route within Weld County that is associated with this Supplement 2. A. Goal 2. Continue the commitment to viable agriculture in Weld County through mitigated protection of established (and potentially expanding) agricultural uses from other proposed new uses that would hinder the operations of the agricultural enterprises. Criteria used for developing the water pipeline location included minimizing impacts to agricultural uses. Thornton's land agents have worked with property owners along the water pipeline alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to minimize affecting the operation of irrigation equipment. The process to develop the water pipeline route was iterative, and is a result of negotiations with individual property owners or detailed land, utility, or resource surveys that revealed engineering or environmental constraints. Thornton's land agents negotiate the purchase of easements where needed based on fair market value. The easements will grant Thornton an area to construct, operate, and maintain the water pipeline, and property owners will maintain fee title to the land. Property owners can continue to use the land within the easement area for purposes such as farming, grazing, or access, so long as such uses do not interfere with or endanger the operation of the TWP. The predominant land use in the TWP area, agricultural use, is compatible with operation of the TWP because the water pipeline and fiber optic cable will be buried below the plow line. Additional measures that will be implemented to minimize impacts to irrigated agricultural land include: + Stripping and storing topsoil separately from excavated trench materials + Seeding or leaving land fallow in accordance with the individual property owner's agreed -upon reclamation procedures following construction of the water pipeline The TWP will cross multiple irrigation ditches along the water pipeline route within unincorporated Weld County as presented in Section 6. Thornton has begun outreach to each irrigation ditch company to begin coordination activities. See Appendix B for additional information on stakeholder outreach. As part of the negotiation process for acquiring easements, Thornton's land agents coordinate with property owners on lateral ditch crossings to limit impacts to agricultural operations. Thornton will obtain appropriate agreements for each crossing before construction. No direct effects on water flow, quantity, quality, or timing in the irrigation ditches are anticipated. Crossings will be constructed using either trenchless or open -cut methods as required by the irrigation ditch company and during times the ditch is not running, if required. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-47 Thornton Water Project Thornton WATER PROJECT CITY OF THORNTON COLORADO 0 0.875 1.75 TWP in Unincorporated Weld County TWP outside Unincorporated _ Weld County —• County Boundary Railroad Weld County Zoning River/Stream/Canal/Ditch Agriculture Lake/Reservoir Commercial Estate Industrial PUD Residential Figure C.2.ia Zoning 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/19/2021 1 inch = 1.75 miles Miles Sources NHO CDWR Weld County Coo; W u7B988_THORNTON_NORTHERN_PROJECT TASK_ORDER_515 t_PERMIT"INGC.SWAPFILESWELD_USRIRESOURCE_MAPSPERMITAPP_2021 ZONING MXD JOUAN 1/192021 12 12 10 PM Thornton Water Project TIPPLE PY 7 BASELI E RD _ F LONGS PE AK ST jJ • �4 y I ger BRIDGE ST \=' BUSH ST `0 .v TWP in Unincorporated a Weld County TWP outside Unincorporated Weld County - County Boundary W M78988 THORNTON NORTHERN PROJECTITASN ORDER 515 1 PERMITTINGIGISWIA3FILESIWELD USRIRESOURCE MAPSIPERMITAPP 20211ZONING.MXD ;QUAN "19/2021 12.12 10 PM THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION A. Goal 3 County land use regulations recognize and respect the rights afforded by the State Constitution and associated statues of individually decreed water rights. Water rights are considered real property and should be protected as any other private property right. The TWP will not impact water rights. The TWP is a water delivery system that will convey domestic water from the WSSC system, purchased by Thornton in the mid -1980's, from unincorporated Larimer County to Thornton. Water from the WSSC system purchased by Thornton from willing sellers has been decreed in Water Court for use in Thornton. A.Goal 4. Promote a quality environment which is free of derelict vehicles, refuse, litter and other unsightly materials. A.Policy 4.1. Property owners should demonstrate responsibility of ownership by minimizing safety and health hazards resulting from, but not limited to, unsafe or dangerous structures and noncommercial junkyards. Thornton and the TWP contractors will provide and maintain sanitary accommodations for the use of their employees during construction of the TWP in a manner that complies with the requirements and regulations of health departments and other governmental bodies. These accommodations, including trash dumpsters, will be located in several locations along the TWP alignment based on the general plan for construction. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws and regulations. Construction waste will be stockpiled in construction staging areas and removed from the construction site during the construction process. Trash dumpsters will be emptied approximately every 1 to 2 weeks. The TWP will not include the need for permanent dumpsters as the water tank, pump stations, and underground water pipeline will be unmanned. A.Goal 8. Ensure that adequate services and facilities are currently available or reasonably obtainable to accommodate the requested new land use change for more intensive development. A.Policy 8.1. The land use applicants should demonstrate that adequate sanitary sewage and water systems are available for the intensity of the development. During construction, water may be purchased from local water providers for construction activities such as watering the construction site to mitigate fugitive dust or hydrostatically testing the water pipeline. Contractors will provide bottled water, water cooler service, or other temporary source of drinking water during construction. Temporary water sources could include nearby fire hydrants or water pipelines. Thornton and/or TWP contractors will negotiate purchase of water deliveries from municipal and/or private sources. The TWP will not include the need for a permanent water supply for domestic purposes as the water tank, pump stations, and underground water pipeline will be unmanned. During construction, portable toilets will be placed in several locations along the TWP construction site based on the general plan for construction. TWP contractors will be responsible for supplying and maintaining portable toilets. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws and regulations and that they screen portable toilets from the general public. The TWP will not include the need for permanent sanitary facilities for domestic purposes as the water tank, pump stations, and underground water pipeline will be unmanned. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-50 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION A.Policy 8.3. The land use applicants should demonstrate that the roadway facilities associated with the proposed development are adequate in width, classification and structural capacity to serve the proposed land use change. The existing road network has adequate capacity to serve anticipated construction traffic needs, and no new roads or improvements to existing roads are anticipated to be necessary in unincorporated Weld County. After construction, the water pipeline and appurtenances could operate year-round, 24 hours a day; however, the water pipeline and appurtenances will be unmanned. The existing road network has adequate capacity to serve anticipated TWP operation traffic needs. It is anticipated that normal operations could include up to two TWP operators traveling in one pickup truck daily along the water pipeline route for a visual inspection and maintenance activities during the hours of 8 a.m. to 5 p.m. TWP operators are also anticipated to conduct up to one visit per day of the water tank and pump station locations to inspect security and operation of each facility. Typically, operation of the pump stations, including video monitoring of site security, will be conducted remotely from another Thornton -owned facility. Up to twice per year, it is anticipated that TWP operators will enter vault and manhole appurtenances to exercise valves and conduct routine maintenance of equipment. To the extent practicable, visual inspections will be from public roads to minimize impacts to property owners. In case of emergency, the operators may be on -site outside of the normal operating hours. Consequently, there will be minimal effects on the volume of traffic on local streets. A.Policy 8.4. The land use applicants should demonstrate that drainage providing stormwater management for the proposed land use change is adequate for the type and style of development and meets the requirements of county, state and federal rules and regulations. Prior to construction, Thornton and/or the TWP contractors will obtain the required Weld County grading permit and the CDPHE Stormwater Discharge Associated with Construction Activity — General Permit. Construction SWMPs will be developed under the general permit to protect the quality of stormwater runoff during construction in accordance with the Construction Stormwater Discharge Permit requirements. Surface drainage BMPs implemented during construction will include application of erosion control techniques and the successful revegetation of disturbed areas. No permanent stormwater facilities are anticipated to be required for the water pipeline and water tank; drainage narratives are provided in Section 16 and Volume 4. Preliminary drainage reports have been developed for the pump station locations and those reports are included in Section 16. Based on the preliminary analysis, detention ponds are anticipated to be required at the pump station sites and preliminary siting of stormwater facilities are shown on the USR maps and are presented in Section 16. Stormwater facilities will be designed and constructed in accordance with Weld County and other requirements as applicable. If used by the TWP contractors and in accordance with Weld County staff recommended conditions of approval, drainage narratives for staging areas will be submitted before start of construction. A.Policy 8.5. The land use applicants should demonstrate that public service providers, such as but not limited to schools, emergency services and fire protection, are informed of the proposed development and are given adequate opportunity to comment on the proposal. No additional level of service from Weld County public service providers is anticipated to be required. TWP USR SUPPLEMENT 2 SECTION CSUMMARY STATEMENT OF THE PROJECT C-51 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION To minimize the impacts of construction on the local community, Thornton will coordinate with Valley RE -1, Saint Vrain Valley RE -1(J), and Johnstown -Milliken RE -5(J) School Districts regarding construction and haul routes and school bus traffic. Emergency vehicle access needs will be maintained and construction activities coordinated with local fire departments, police departments, ambulance services, and other emergency responders as necessary. Initial outreach has been conducted to fire districts. See Appendix B for additional information on stakeholder outreach. A. Policy 9.4. Consider conservation of natural site features such as topography, vegetation and water courses, in conjunction with the conversion of land uses. The TWP will utilize trenchless construction methods for water pipeline installation to minimize effects to natural resources such as jurisdictional waters, including streams, rivers, lakes, and wetland areas. The area disturbed for constructing the water pipeline will be restored to pre - construction conditions, including grade and vegetation, thus minimizing long-term impacts. The majority of the impacts on vegetation will be temporary during construction of the water pipeline and long-term impacts to native vegetation communities are not expected. Disturbed areas will be restored to pre -construction grades and revegetated where appropriate after construction. Areas disturbed for water tank and pump station sites that are not designated for infrastructure, such as tank/forebay, buildings, parking and access areas, and equipment will be revegetated where appropriate after construction. Restored vegetation will be comparable to existing vegetation. Certified weed -free seed mix consisting of drought -tolerant native grasses and other types of vegetation as appropriate to meet property owner's reasonable preferences and regulatory requirements will be specified in the SWMP for the revegetation of disturbed areas. Disturbed mature vegetation will be replaced, per a property owner's reasonable request, with a like species. Potential future repairs and maintenance could affect discrete areas of vegetation when the water pipeline is accessed in a particular location. Any vegetated areas disturbed during maintenance or required repairs will be restored by the methods used during construction. Based on site visits conducted in 2016, 2017, 2019, and 2020 along publicly accessible areas and using Google Earth imagery, six broad vegetation communities within the TWP were identified and are as follows: • Mixed uplands • Nonnative upland + Riparian • Wetlands + Agricultural lands + Developed/disturbed areas Water pipeline crossings of high -quality vegetation such as jurisdictional wetland communities will be constructed using trench less construction methods. Additional information on existing vegetation is included in Appendix A. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-52 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION A.Polcy 9.5. Applications for a change of land use in the agricultural areas should be reviewed in accordance with all potential impacts to surrounding properties and referral agencies. Encourage applicants to communicate with those affected by the proposed land use change through the referral process. Criteria used for developing the water pipeline location included minimizing impacts to agricultural uses. Thornton's land agents have worked with property owners along the water pipeline alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to minimize affecting the operation of irrigation equipment. The process to develop the water pipeline route was iterative, and is a result of negotiations with individual property owners or detailed land, utility, or resource surveys that revealed engineering or environmental constraints. Thornton's land agents negotiate the purchase of easements where needed based on fair market value. The easements will grant Thornton an area to construct, operate, and maintain the water pipeline, and property owners will maintain fee title to the land. Property owners can continue to use the land within the easement area for purposes such as farming, grazing, or access, so long as such uses do not interfere with or endanger the operation of the TWP. The predominant land use in the TWP area, agricultural use, is compatible with operation of the TWP because the water pipeline and fiber optic cable will be buried below the plow line. Additional measures that will be implemented to minimize impacts to irrigated agricultural land include: + Stripping and storing topsoil separately from excavated trench materials + Seeding or leaving land fallow in accordance with the individual property owner's agreed -upon reclamation procedures following construction of the water pipeline The TWP will cross multiple irrigation ditches along the water pipeline route within unincorporated Weld County as presented in Section 6. Thornton has begun outreach to each irrigation ditch company to begin coordination activities. See Appendix B for additional information on stakeholder outreach. As part of the negotiation process for acquiring easements, Thornton's land agents coordinate with property owners on lateral ditch crossings to limit impacts to agricultural operations. Thornton will obtain appropriate agreements for each crossing before construction. No direct effects on water flow, quantity, quality, or timing in the irrigation ditches are anticipated. Crossings will be constructed using either trenchless or open -cut methods as required by the irrigation ditch company and during times the ditch is not running, if required. Public outreach is not required by Weld County's USR permit application process. However, to introduce the public and potentially affected property owners to the TWP, respond to questions, and to collect input from the public and potentially affected property owners, Thornton conducted a series of Open Houses in November and December 2016. To introduce the public and potentially affected property owners to the TWP, the TWP website, TWP e-mail address, and TWP phone line (www.ThorntonWaterProject.com, info@ThorntonWaterProject.com, and 720-977-6700) launched on October 28, 2016. The website, e-mail, and phone line provide opportunities for questions and the collection of input from the public and potentially affected property owners. To determine the alternative corridor least impactful to local communities, Thornton, in 2015, conducted a series of outreach meetings with local governments and agencies that could be TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-53 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION impacted by the TWP. During the outreach meetings with each local government and agency, feedback was collected to determine preference(s) and/or determine potential problems for the location of the water pipeline within the local government or agency's jurisdictional and/or GMA boundaries. Outreach meetings were conducted with the following local governments: • Berthoud • Dacono • Firestone • Fort Collins • Frederick • Greeley • Johnstown • Larimer County • Loveland • Mead • Milliken • Timnath • Weld County • Wellington • Windsor Thornton has been in discussions with USACE beginning in 2014 to provide information on the TWP to USACE staff. Thornton will continue consulting with USACE and will obtain jurisdictional determination from the USACE before finalizing design activities to determine which areas in the TWP route are jurisdictional waters. Design will include trenchless construction methods at jurisdictional water crossings. Additional outreach and coordination activities included: • Meetings with local major utility providers • Meeting with CDOT • Meeting with CPW • Meeting with Great Western Railroad • Presenting the TWP at the Energy Industry Working Group (Weld County oil and gas companies) on December 15, 2016 • Sending letters to initiate coordination activities to local irrigation and ditch companies, utility providers, wildlife agency outreach (CPW and USFWS), and local fire districts Thornton will continue coordinating with stakeholders and will obtain license agreements and permits as appropriate. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-54 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION UD.Goal 5. The County and municipalities should strive to coordinate urban land use planning in cooperative planning areas, including such items as development policies and standards, zoning, street and highway construction, open space, public infrastructure and other matters associated with urban development. To determine the alternative corridor least impactful to local communities, Thornton, in 2015, conducted a series of outreach meetings with local governments and agencies that could be impacted by the TWP. During the outreach meetings with each local government and agency, feedback was collected to determine preference(s) and/or determine potential problems for the location of the water pipeline within the local government or agency's jurisdictional and/or GMA boundaries. The TWP is not located within Weld County ROW or future planned ROW except where it must cross ROW. Thornton understands that, if the TWP crosses the Weld County ROW, then use of that ROW will require Weld County approval. Thornton reviewed GMA boundaries and transportation master plans for Berthoud, Dacono, Firestone, Frederick, Fort Lupton, Mead, Milliken, Johnstown, Platteville, Severance, Timnath and Windsor to determine the extent of future ROW within GMA boundaries. Thornton will coordinate the location of the water pipeline within these municipalities and Weld County as appropriate. UC.Goal 2 Maintain the rural character of the unincorporated communities. Criteria used for developing the water pipeline location included minimizing impacts to agricultural uses. Thornton's land agents have worked with property owners along the water pipeline alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to minimize affecting the operation of irrigation equipment. The process to develop the water pipeline route was iterative, and is a result of negotiations with individual property owners or detailed land, utility, or resource surveys that revealed engineering or environmental constraints. Thornton's land agents negotiate the purchase of easements where needed based on fair market value. The easements will grant Thornton an area to construct, operate, and maintain the water pipeline, and property owners will maintain fee title to the land. Property owners can continue to use the land within the easement area for purposes such as farming, grazing, or access, so long as such uses do not interfere with or endanger the operation of the TWP. The predominant land use in the TWP area, agricultural use, is compatible with operation of the TWP because the water pipeline and fiber optic cable will be buried below the plow line. Additional measures that will be implemented to minimize impacts to irrigated agricultural land include: + Stripping and storing topsoil separately from excavated trench materials + Seeding or leaving land fallow in accordance with the individual property owner's agreed -upon reclamation procedures following construction of the water pipeline The TWP will cross multiple irrigation ditches along the water pipeline route within unincorporated Weld County as presented in Section 6. Thornton has begun outreach to each irrigation ditch company to begin coordination activities. See Appendix B for additional information on stakeholder outreach. As part of the negotiation process for acquiring easements, Thornton's land agents coordinate with property owners on lateral ditch crossings to limit impacts to agricultural operations. Thornton will obtain appropriate agreements for each crossing before construction. No TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-55 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION direct effects on water flow, quantity, quality, or timing in the irrigation ditches are anticipated. Crossings will be constructed using either trenchless or open -cut methods as required by the irrigation ditch company and during times the ditch is not running, if required. UC.Goal 4. Promote a quality environment which is free of unsightly materials, including but not limited to derelict vehicles, refuse, and litter. UC.Policy 4.1. Property owners should demonstrate responsibility of ownership by minimizing safety and health hazards resulting from, but not limited to, derelict structures, derelict vehicles and noncommercial junkyards. Thornton and the TWP contractors will provide and maintain sanitary accommodations for the use of their employees during construction of the TWP in a manner that complies with the requirements and regulations of health departments and other governmental bodies. These accommodations, including trash dumpsters, will be located in several locations along the TWP alignment based on the general plan for construction. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws and regulations. Construction waste will be stockpiled in construction staging areas and removed from the construction site during the construction process. Trash dumpsters will be emptied approximately every 1 to 2 weeks. The TWP will not include the need for permanent dumpsters as the water tank, pump stations, and underground water pipeline will be unmanned. RUA.Goal 2. The County, property owners, municipalities and other jurisdictions should coordinate urban land use planning within the Regional Urbanization Areas, concerning but not limited to development policies and standards, zoning, street and highway construction, open space and trails, public infrastructure and other matters associated with urban development. The water pipeline is located within the Dry Creek Regional Urbanization Area (RUA). Within this RUA, the water pipeline is parallel to the future ROW of County Road 17. The water pipeline and fiber optic cable will be compatible with adjacent land uses because they will be buried at a depth sufficient to prevent interference with anticipated land uses. The TWP is a low impact, passive use that is compatible with other uses. The water pipeline and fiber optic cable will be buried, and land use effects are anticipated to be minimal after construction. RUA.Goal 3. Development within Regional Urbanization Areas should occur in a manner that results in an attractive and functional working and living environment. The water pipeline is located within the Dry Creek Regional Urbanization Area (RUA). Within this RUA, the water pipeline is parallel to the future ROW of County Road 17. The water pipeline and fiber optic cable will be compatible with adjacent land uses because they will be buried at a depth sufficient to prevent interference with anticipated land uses. The TWP is a low impact, passive use that is compatible with other uses. The water pipeline and fiber optic cable will be buried, and land use effects are anticipated to be minimal after construction. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-56 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION RUA.Policy 3.1. Consider the compatibility with surrounding land uses and natural site features. The water pipeline is located within the Dry Creek Regional Urbanization Area (RUA). Within this RUA, the water pipeline is parallel to the future ROW of County Road 17. The water pipeline and fiber optic cable will be compatible with adjacent land uses because they will be buried at a depth sufficient to prevent interference with anticipated land uses. The TWP is a low impact, passive use that is compatible other uses. The water pipeline and fiber optic cable will be buried, and land use effects are anticipated to be minimal after construction. The water pipeline crosses Big Dry Creek within the Dry Creek RUA. The TWP will utilize trenchless construction methods to minimize impacts to natural resources such as jurisdictional waters and wildlife habitat associated with those areas. The area disturbed in constructing the water pipeline will be restored to pre -construction conditions, including grade and vegetation. RUA.Policy 3.6. Development should conserve and/or enhance natural resources and features. The water pipeline is located within the Dry Creek Regional Urbanization Area (RUA). Within this RUA, the water pipeline is parallel to the future ROW of County Road 17. The water pipeline and fiber optic cable will be compatible with adjacent land uses because they will be buried at a depth sufficient to prevent interference with anticipated land uses. The TWP is a low impact, passive use that is compatible other uses. The water pipeline and fiber optic cable will be buried, and land use effects are anticipated to be minimal after construction. The water pipeline crosses Big Dry Creek within the Dry Creek RUA. The TWP will utilize trenchless construction methods to minimize impacts to natural resources such as jurisdictional waters and wildlife habitat associated with those areas. The area disturbed in constructing the water pipeline will be restored to pre -construction conditions, including grade and vegetation. RUA.Goal7. Promote a quality environment within the Regional Urbanization Area that is free of unsightly materials, including but not limited to derelict vehicles, refuse and litter. RUA.Policy 7.2. Property owners should demonstrate responsibility of ownership by minimizing safety and health hazards resulting from, but not limited to, derelict structures, derelict vehicles and noncommercial junkyards. Thornton and the TWP contractors will provide and maintain sanitary accommodations for the use of their employees during construction of the TWP in a manner that complies with the requirements and regulations of health departments and other governmental bodies. These accommodations, including trash dumpsters, will be located in several locations along the TWP alignment based on the general plan for construction. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws and regulations. Construction waste will be stockpiled in construction staging areas and removed from the construction site during the construction process. Trash dumpsters will be emptied approximately every 1 to 2 weeks. The TWP will not include the need for permanent dumpsters as the water tank, pump stations, and underground water pipeline will be unmanned. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-57 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION P.Goal 1. Promote efficient and cost-effective delivery of public facilities and services P.Policy 1.1. Encourage consolidation of public facilities or services and coordination between providers, to avoid duplication of costs and promote efficiency. If Weld County's improvement projects occur within the timeframe of the construction of the TWP, Thornton will work with Weld County and other involved parties to coordinate construction and minimize disruption, avoid duplication of costs, and promote efficiency. WA. Goal 1. Support the development of water that is put to beneficial use, along with associated infrastructure. WA.Policy 1.1. Acknowledge a water right as real property that is held by the individual or entity that has developed or maintained the water decree. The TWP will not impact water rights. The TWP is a water delivery system that will convey domestic water from the WSSC system, purchased by Thornton in the mid -1980's, from unincorporated Larimer County to Thornton. Water from the WSSC system purchased by Thornton from willing sellers has been decreed in Water Court for use in Thornton. WA.Goal 2. Strive to maintain and protect water supply storage facilities, conveyances and infrastructure adequate to sustain continued water use. Impacts to existing water use facilities will be managed and mitigated. The TWP route was located to minimize impacts to water supply storage facilities. The TWP will cross water supply conveyances and infrastructure, such as irrigation ditches and pipelines conveying raw and domestic water service. As part of the stakeholder outreach effort, Thornton has met with local major water providers and sent letters to water providers to begin coordination activities regarding possible crossings of existing and proposed future utilities. The water pipeline and appurtenances will be designed and constructed in accordance with accepted standards of practice. The design will incorporate criteria for crossing existing utilities, such as minimum clearance requirements between pipelines. Subsurface utility engineering will be completed during the design and construction phases of the TWP and will include surface geophysical methods and test holes to determine the locations of existing utilities. The depth of bury will vary based on existing utility crossings, road crossings, water crossings, other existing or proposed features, and property owner's reasonable preferences. See Appendix B for additional information on stakeholder outreach. During construction of the water pipeline short-term disruptions could occur to domestic water service if a utility requires relocation. Area residents will be notified in advance of any service disruptions. The TWP will cross multiple irrigation ditches within unincorporated Weld County. Thornton has begun outreach to each irrigation ditch company to begin coordination activities. Thornton will obtain appropriate agreements for each crossing prior to construction. Crossings will be constructed using either open -cut or trench less construction methods as directed by the irrigation ditch company and during times the ditch is not running, if required. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-58 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION WA.Goal 4. Strive to address the quality of all water bodies as outlined in the State and Federal Water Quality Standards. Development of the TWP route considered pipeline construction locations that minimize impacts to historical surface and subsurface water flows in the project area. Pipeline crossings of jurisdictional waters, including wetlands, will be constructed utilizing trenchless construction methods. This construction method will eliminate surface disturbance to the waterbody and effects on water quality. The TWP will cross multiple open waters, riparian areas, and wetlands, additional information can be found the Revised Natural and Cultural Resources Assessment in Appendix A. Prior to construction, Thornton and/or the TWP contractors will obtain the required Weld County grading permit and CDPHE Stormwater Discharge Associated with Construction Activity —General Permit. SWMPs will be developed under the general permit to protect the quality of stormwater runoff during construction in accordance with the Construction Stormwater Discharge Permit requirements. Construction wastewater associated with the potential dewatering of trenches would be handled in accordance with CDPHE permit discharge requirements. Prior to construction, Thornton and/or the TWP contractors will obtain a CDPHE General Permit for Construction Dewatering Activities and specify the management measures to be used to capture and manage any generated discharge. To protect water resources from potential contamination, construction staging areas will be located and arranged in a manner to preserve trees and vegetation to the extent feasible. Excavated material or other construction materials will not be stockpiled or deposited near or on stream banks or other watercourse perimeters where they could be washed away by high water or storm runoff, or could encroach upon stream banks. Best management practices will be implemented for stormwater management. Additional information to protect water resources from potential contamination is provided in Section C.2.c and Appendix C. No permanent stormwater facilities are anticipated to be required for the water pipeline and water tank; drainage narratives are provided in Section 16 and Volume 4. Preliminary drainage reports have been developed for the pump station locations and those reports are included in Section 16. Based on the preliminary analysis, detention ponds are anticipated to be required at the pump station sites and preliminary siting of stormwater facilities are shown on the USR maps and are presented in Section 16. Stormwater facilities will be designed and constructed in accordance with Weld County and other requirements as applicable. If used by the TWP contractors and in accordance with Weld County staff recommended conditions of approval, drainage narratives for staging areas will be submitted before start of construction. Construction activities will comply with applicable federal, state, and local laws and regulation regarding the use of hazardous substances as described in Section C.2.f. WA.Policy 4.2. Applications for new development should include provisions for adequately handling drainage and for controlling surface erosion or sedimentation within the site itself. Surface drainage stormwater BMPs will include application of erosion control techniques and the successful revegetation of disturbed areas. The required Weld County grading permit and CDPHE construction stormwater permits and SWMPs will include detailed descriptions of BMPs that will be used to protect surface hydrology and water quality. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-59 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION No permanent stormwater facilities are anticipated to be required for the water pipeline and water tank; drainage narratives are provided in Section 16 and Volume 4. Preliminary drainage reports have been developed for the pump station locations and those reports are included in Section 16. Based on the preliminary analysis, detention ponds are anticipated to be required at the pump station sites and preliminary siting of stormwater facilities are shown on the USR maps and are presented in Section 16. Stormwaterfacilities will be designed and constructed in accordance with Weld County and other requirements as applicable. If used by the TWP contractors and in accordance with Weld County staff recommended conditions of approval, drainage narratives for staging areas will be submitted before start of construction. WA.Goal 6. Development should occur in areas where adequate water quantity and quality is currently available or reasonably obtainable. During construction, water may be purchased from local water providers for construction activities such as watering the construction site to mitigate fugitive dust or hydrostatically testing the water pipeline. Contractors will provide bottled water, water cooler service, or other temporary source of drinking water during construction. Temporary water sources could include nearby fire hydrants or water pipelines. Thornton and/or TWP contractors will negotiate purchase of water deliveries from municipal and/or private sources. The TWP will not include the need for a permanent water supply for domestic purposes as the water tank, pump stations, and underground water pipeline will be unmanned. AIR.Goal 1. Maintain National Air Quality Standards and, where practicable, improve air quality in the County. AIR.Policy 1.1. If applicable, land use applications should demonstrate future impacts on current air quality. The amount of surface clearing required for construction will exceed 25 acres; therefore, Thornton and/or the TWP contractors will develop a fugitive dust control plan, submit an air pollution emissions notice, and obtain a permit from CDPHE before construction activities in accordance with state air quality regulations. The TWP will be constructed under multiple packages; therefore, multiple permits will be obtained as required. Construction activities, such as vehicles driven over cleared ground, general disturbance to vegetated areas, or soil stockpiles susceptible to winds, can cause fugitive dust. During construction, dust control measures will be implemented. Examples of these mitigation measures that may be used on the TWP include: • Speed limits for construction vehicles within the work area • Water application to disturbed areas, dirt access roads, and stockpiles • Erosion control techniques and best management practices • Revegetation of disturbed areas where appropriate following construction activities Water will be used as needed for dust suppression during construction. Water sources could be nearby fire hydrants, water pipelines, and water trucks. Water may be purchased from local water providers for construction activities. During construction painting activities are anticipated to occur. TWP contractors will be required to meet federal, state, and local requirements limiting emission of volatile organic compounds. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-60 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Permanent facilities associated with the TWP will comply with air pollution control regulations. The water pipeline, buried appurtenances, and water tank will not have emission sources; therefore, will not require a Colorado Air Emissions Permit. An emergency backup diesel generator might be located outside at each of the pump stations for emergency backup power if a second electrical feed is not included. If a second electrical feed is feasible and cost-effective, emergency diesel powered backup generators will not be required. Thornton will continue to coordinate with PVREA and United Power to determine specific requirements for power service to the pump stations. The proposed generator will comply with county, state, and federal air quality standards. If required by the state, a Colorado Air Emissions Permit will be obtained prior to system startup. N.Goal 1. Minimize the impact of noise on County residents. During construction of the TWP, the TWP will comply with Weld County's then -existing maximum permissible noise levels (currently WCCSection 14-9-40). Noise from construction equipment will be of short duration during construction. Noise levels from equipment will be controlled through the use of standard maintenance procedures and the use of appropriate mufflers. Construction hours will typically be from 7:00 a.m. to 7:00 p.m., Monday through Saturday unless otherwise approved by Weld County. Construction may extend beyond these hours on an as -required and case -by -case approved basis. For example, some construction activities may be required to complete uninterruptible tasks, meet an in-service date, or limit short-term impacts to traffic. No noises related to the water pipeline and water tank operation are anticipated. At the pump station sites, mitigation measures will be implemented and the pump stations will comply with Weld County's then -existing maximum permissible noise levels (currently WCC Section 14-9-40). Additional information is included in Section 23, Noise Study. TPD. Goal 1. The County expects businesses, residents and landowners to prevent negative impacts on human health and the environment from waste processing or disposal. TPD.Policy 1.1. Land use applications should be required to characterize the waste stream associated with the proposed land use. Thornton and the TWP contractors will provide and maintain sanitary accommodations for the use of their employees during construction of the TWP in a manner that complies with the requirements and regulations of health departments and other governmental bodies. These accommodations, including trash dumpsters, will be located in several locations along the TWP alignment based on the general plan for construction. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws and regulations. Construction waste will be stockpiled in construction staging areas and removed from the construction site during the construction process. Trash dumpsters will be emptied approximately every 1 to 2 weeks. The TWP will not include the need for permanent dumpsters as the water tank, pump stations, and underground water pipeline will be unmanned. Construction, operation, and maintenance activities will follow best management practices for the management of wastes to avoid and minimize impacts from potential spills or other releases to the environment. These practices are discussed in greater detail in Section C.2.f. Adverse impacts from the release of construction or operations wastes are not expected. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-61 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION H. Goal 1. Encourage the minimization and careful collection of hazardous waste. Require the proper disposal of hazardous components, products and waste. Construction activities involving Thornton or the TWP contractors bringing any hazardous materials onto the site will comply with applicable federal, state, and local laws and regulations regarding the handling, storage, disposal, transportation, and use of hazardous substances. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws. Additional information is included in Section C.2.f. H.Policy 1.1. All producers of regulated hazardous waste and users of regulated hazardous materials within the County should comply with federal, state and County statutes, regulations and ordinances regarding use, reporting, storage and disposal of regulated hazardous waste or products. Construction activities involving Thornton or the TWP contractors bringing any hazardous materials onto the site will comply with applicable federal, state, and local laws and regulations regarding the handling, storage, disposal, transportation, and use of hazardous substances. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws. Additional information is included in Section C.2.f. NW.Goal 1. Support efforts to eradicate noxious weeds throughout the County in compliance with state and federal laws. NW.Policy 1.2. Attempt to control noxious weeds on County property and in County maintained rights -of -way. Noxious weeds within the TWP construction limits, including within Weld County ROW, will be controlled using the following IPM methods as described by the CDOA. The following methods have been developed to control noxious weeds in a manner that prevents harm to human health and to environmentally sensitive areas such as waterways and desirable vegetation including native trees. • Major equipment (e.g. truck equipment and backhoes) will be cleaned by high pressure air or water spray before being delivered to the project area to avoid introducing undesirable plants and noxious weeds. • If practicable, topsoil should not be salvaged in any area densely infested with noxious weeds. + For areas where removal is not practicable or only a small area of noxious weeds is present, pre- treat all noxious weed populations in the topsoil. • Fertilizer or other soil amendments will not be used unless recommended by a revegetation specialist based on site -specific conditions. The use of fertilizers will be restricted because they can promote noxious weeds and can be detrimental to native species in the revegetation mix. • After construction is complete, all disturbed areas will be properly revegetated as quickly as possible. Prompt revegetation with appropriate species is essential for preventing the spread of noxious weeds. • Certified weed -free seed and mulch will be used for revegetation. Weed -free straw bales will be used for sediment barriers. • If stands of noxious weeds become established, weed control would be implemented following an integrated approach specific to the weed species present. + Because new control methods are continually being developed, particularly for herbicide applications, any control methods used will follow the CDOA and Weld County recommendations at the time of implementation. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-62 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION W. Goal 1. New development should be located and designed to conserve critical ecosystem components, including wetlands, significant wildlife habitats and migration corridors. Significant wildlife habitat is defined as a geographical area containing existing or migrating wildlife and a combination of the essential elements of food, water, cover and space in quantities sufficient to support appropriate wildlife. The TWP will utilize trenchless construction methods for water pipeline installation to minimize impacts to natural resources such as jurisdictional waters and wildlife habitat associated with those areas. The area disturbed in constructing the water pipeline will be restored to pre -construction conditions, including grade and vegetation, minimizing long-term impacts to wildlife. The TWP was assessed for potential jurisdictional waters and wildlife habitat using publicly available mapping and aerial photographs, and by conducting a windshield survey of areas that could be publicly accessed. Information on terrestrial and aquatic animals was obtained from various sources including Colorado Parks and Wildlife, Colorado Natural Diversity Information System, Colorado Natural Heritage Program, U.S. Fish and Wildlife Service, published literature, and field surveys. Site surveys will be performed to aid in the determination of jurisdictional waters and wildlife habitat. Information from the assessment and survey information will be used to develop final design. Mitigation methods to minimize impacts to these areas will be incorporated into the design and construction as appropriate. Jurisdictional water crossings will be constructed using trenchless construction methods. An assessment was conducted for potential habitat of federally threatened, endangered, and candidate species protected under the Endangered Species Act. The TWP will have no effect on federally listed threatened, endangered, or candidate wildlife or plant species. Mitigation measures such as restricting construction during nesting seasons may be implemented as appropriate. Additional information can be found in the Revised Natural and Cultural Resources Assessment in Appendix A. Impacts to these areas will be temporary and only occur while the water pipeline construction is taking place. After construction is completed, the area will be restored to pre -construction grades and vegetation. Additional information including mitigation measures to minimize impacts to wildlife can be found in the Revised Natural and Cultural Resources Assessment in Appendix A. W.Policy 1.1. Development and design of land uses which require drainage, excessive removal of riparian vegetation and alterations of river or stream banks should be discouraged in order to protect river or stream quality and to protect key wildlife habitat. The water pipeline will not require drainage and no alterations of river or stream banks will occur. Site surveys will be performed to aid in the determination of jurisdictional waters and wildlife habitat associated with those areas. Information from the assessment and survey information will be used to develop final design. Mitigation methods to minimize impacts to these areas will be incorporated into the design and construction as appropriate. Jurisdictional water crossings will be constructed using trench less construction methods. Open waters and wetlands determined to be non -jurisdictional and any riparian areas would be temporarily impacted by open cut trenching activities. During construction, the trench would be as narrow as safely practicable when crossing non -jurisdictional waters and wetlands or any riparian areas. The area disturbed in constructing the water pipeline will be restored to pre -construction conditions, including grade and vegetation. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-63 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION No riparian areas have been identified at the water tank and pump station sites and no alterations of river or stream banks will occur at those sites. Additional information can be found in the Revised Natural and Cultural Resources Assessment in Appendix A. No permanent stormwater facilities are anticipated to be required for the water pipeline and water tank; drainage narratives are provided in Section 16 and Volume 4. Preliminary drainage reports have been developed for the pump station locations and those reports are included in Section 16. Based on the preliminary analysis, detention ponds are anticipated to be required at the pump station sites and preliminary siting of stormwater facilities are shown on the USR maps and are presented in Section 16. Stormwaterfacilities will be designed and constructed in accordance with Weld County and other requirements as applicable. If used by the TWP contractors and in accordance with Weld County staff recommended conditions of approval, drainage narratives for staging areas will be submitted before start of construction. W.Policy 1.2. Conflicts with fish and wildlife habitats and migration routes should be considered in land development. Developments adjacent to rivers and streams, waterfowl areas and important or critical wildlife areas should incorporate reduced densities, adequate setbacks and buffered areas. The TWP will utilize trenchless construction methods for water pipeline installation to minimize impacts to natural resources such as jurisdictional waters and wildlife habitat associated with those areas. The area disturbed in constructing the water pipeline will be restored to pre -construction conditions, including grade and vegetation, minimizing long-term impacts to wildlife. The TWP was assessed for potential jurisdictional waters and wildlife habitat using publicly available mapping and aerial photographs, and by conducting a windshield survey of areas that could be publicly accessed. Information on terrestrial and aquatic animals was obtained from various sources including Colorado Parks and Wildlife, Colorado Natural Diversity Information System, Colorado Natural Heritage Program, U.S. Fish and Wildlife Service, published literature, and field surveys. Site surveys will be performed to aid in the determination of jurisdictional waters and wildlife habitat. Information from the assessment and survey information will be used to develop final design. Mitigation methods to minimize impacts to these areas will be incorporated into the design and construction as appropriate. Jurisdictional water crossings will be constructed using trenchless construction methods. An assessment of the TWP was conducted for wildlife habitat and migration corridors. A description of the ways that wildlife use the area within and near the TWP, and the species involved with proposed setbacks and other potential mitigation measures, can be found in the Revised Natural and Cultural Resources Assessment in Appendix A. The TWP could temporarily impede movement of wildlife and result in the displacement of some individuals during construction activities. During construction, wildlife crossovers (trench plugs) with ramps on each side of the trench could be installed at well-defined game trails. The water pipeline would not provide a barrier to wildlife movement over the long term because the water pipeline would be buried. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-64 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION W.Policy 1.3. Identify and attempt to protect critical or unique habitat areas of high public value, such as habitats of endangered or unique species, significant viewing areas and breeding and spawning areas. An assessment was conducted for potential habitat of federally threatened, endangered, and candidate species protected under the Endangered Species Act. The TWP will have no effect on federally listed threatened, endangered, or candidate wildlife or plant species. Mitigation measures such as restricting construction during nesting seasons may be implemented as appropriate. Additional information can be found in the Revised Natural and Cultural Resources Assessment in Appendix A. Impacts to these areas will be temporary and only occur while the water pipeline construction is taking place. After construction is completed, the area will be restored to pre -construction grades and vegetation. W.Goal 2. Traditional wildlife uses, such as hunting, trapping, and fishing in agricultural and non -developed portions of the County, are beneficial. Support the maintenance of these wildlife uses. The TWP is located in and adjacent to agricultural land use areas and non -developed portions of Weld County. The water pipeline and fiber optic cable will be compatible with existing agricultural uses and agricultural use within the permanent easement can continue after construction so long as such uses do not interfere with or endanger the operation of the TWP. The TWP is not anticipated to impact wildlife uses, such as hunting, trapping, and fishing practices once the water pipeline and fiber optic cable are installed. W.Policy 2.1. The effect of proposed development upon wildlife and habitat should be evaluated. Loss of critical habitat should be mitigated. The County will maintain maps of known critical wildlife habitats. An assessment of the TWP was conducted for wildlife and wildlife habitat. Information on terrestrial and aquatic animals was obtained from various sources including Colorado Parks and Wildlife, Colorado Natural Diversity Information System, Colorado Natural Heritage Program, U.S. Fish and Wildlife Service, published literature, and field surveys. Wildlife, including habitat and special status species, and associated mitigation measures that could be implemented to minimize impacts to wildlife are discussed in the Revised Natural and Cultural Resources Assessment in Appendix A. An assessment was conducted for potential habitat of federally threatened, endangered, and candidate species protected under the Endangered Species Act. The TWP will have no effect on federally listed threatened, endangered, or candidate wildlife or plant species. Mitigation measures such as restricting construction during nesting seasons may be implemented as appropriate. Additional information can be found in the Revised Natural and Cultural Resources Assessment in Appendix A. Along the water pipeline alignment, impacts to these areas will be temporary and only occur while the water pipeline construction is taking place. After construction is completed, the area will be restored to pre -construction grades and vegetation. W.Policy 2.2. The integrity of movement in wildlife corridors should be conserved. An assessment of the TWP was conducted for wildlife habitat and migration corridors. A description of the ways that wildlife use the area within and near the TWP, and the species involved with TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-65 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION proposed setbacks and other potential mitigation measures, can be found in the Revised Natural and Cultural Resources Assessment in Appendix A. The TWP could temporarily impede movement of wildlife and result in the displacement of some individuals during construction activities. During construction, wildlife crossovers (trench plugs) with ramps on each side of the trench could be installed at well-defined game trails. The water pipeline would not provide a barrier to wildlife movement over the long term because the water pipeline would be buried. W.Policy 2.3. Destruction of wetlands or riparian areas will be strongly discouraged, and mitigation for loss of wetlands and riparian habitat will be encouraged. Site surveys will be performed to aid in the determination of jurisdictional waters and wildlife habitat associated with those areas. Information from the assessment and survey information will be used to develop final design. Mitigation methods to minimize impacts to these areas will be incorporated into the design and construction as appropriate. Thornton has been in discussions with USACE beginning in 2014 to provide information on the TWP to USACE staff. Thornton will continue consulting with USACE and plans to submit a jurisdictional determination request to USACE before completing design activities to determine which areas in the TWP are jurisdictional waters. Design will include trenchless construction methods at jurisdictional water crossings. Open waters and wetlands determined to be non -jurisdictional and any riparian areas would be temporarily impacted by open cut trenching activities. During construction, the trench would be as narrow as safely practicable when crossing non -jurisdictional waters and wetlands or any riparian areas. The area disturbed in constructing the water pipeline will be restored to pre -construction conditions, including grade and vegetation. Additional information can be found in the Revised Natural and Cultural Resources Assessment in Appendix A. W.Goal 3. Coordinate with local, state and federal agencies to identify, conserve, protect or enhance critical fish and wildlife habitat by attempting to implement measures for the protection or enhancement of such areas. Thornton has conducted initial coordination meetings with CPW and will continue coordination with CPW as the TWP is developed and implemented. CPW has published recommended buffer zones and seasonal restrictions for raptors in Colorado to minimize the effects of disturbance. Thornton will review the CPW raptor nest data and perform nest surveys for raptors before the nesting season to identify potential active raptor nests before construction. Thornton will coordinate with CPW regarding any potential conflicts between scheduled construction and potential raptor nests and develop measures acceptable to CPW to minimize impacts on nesting raptors. Thornton has sent letters to CPW and USFWS to initiate coordination activities. See Appendix B for additional information on stakeholder outreach. O. Goal 4. Encourage the preservation, enhancement and/or maintenance of significant natural land features during the land use process. The TWP will utilize trenchless construction methods for water pipeline installation to minimize impacts to natural resources such as jurisdictional waters and wildlife habitat associated with those TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-66 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION areas. The area disturbed in constructing the water pipeline will be restored to pre -construction conditions, including grade and vegetation, minimizing long-term impacts to wildlife. O.Policy 4.3. Encourage compatible, drought -tolerant landscaping in land use proposals and ensure the integration of new landscaping with the existing natural landscape. The majority of the impacts on vegetation will be temporary during construction of the water pipeline and long-term impacts to native vegetation communities are not expected. Disturbed areas will be restored to pre -construction grades and revegetated where appropriate after construction. Areas disturbed for water tank and pump station sites that are not designated for infrastructure, such as tank/forebay, buildings, parking and access areas, and equipment will be revegetated where appropriate after construction. Restored vegetation will be comparable to existing vegetation. Certified weed -free seed mix consisting of drought -tolerant native grasses and other types of vegetation as appropriate to meet property owner's reasonable preferences or regulatory requirements will be specified in the SWMP for the revegetation of disturbed areas. Disturbed mature vegetation will be replaced, per a property owner's reasonable request, with a like species. Potential future repairs and maintenance could affect discrete areas of vegetation when the water pipeline is accessed in a particular location. Any vegetated areas disturbed during maintenance or required repairs will be restored by the methods used during construction. NR.Goal 3. Recognize Weld County soils as a natural resource that is important to support the Weld County economy. Surface drainage BMPs implemented during construction will include application of erosion control techniques and the successful revegetation of disturbed areas. The required Weld County grading permit and CDPHE construction stormwater permits will be obtained before construction, and the associated SWMPs will include detailed descriptions of BMPs that will be used to control erosion. Disturbed areas will be restored to pre -construction grades and revegetated where appropriate after construction. See Appendix C for additional information on BMPs. No permanent stormwater facilities are anticipated to be required for the water pipeline and water tank; drainage narratives are provided in Section 16 and Volume 4. Preliminary drainage reports have been developed for the pump station locations and those reports are included in Section 16. Based on the preliminary analysis, detention ponds are anticipated to be required at the pump station sites and preliminary siting of stormwater facilities are shown on the USR maps and are presented in Section 16. If used by the TWP contractors and in accordance with Weld County staff recommended conditions of approval, drainage narratives for staging areas will be submitted before start of construction. Topsoil will be stripped and stored separately from excavated trench materials. NR.Policy 3.1. Support efforts to limit the loss of soil through wind and water erosion. Surface drainage BMPs implemented during construction will include application of erosion control techniques and the successful revegetation of disturbed areas. The required Weld County grading permit and CDPHE construction stormwater permits will be obtained before construction, and the associated SWMPs will include detailed descriptions of BMPs that will be used to control erosion. Disturbed areas will be restored to pre -construction grades and revegetated where appropriate after construction. Permanent stormwater detention will be constructed as required by Weld County Storm Drainage Criteria to mitigate erosion from surface runoff. See Appendix C for additional information on BMPs. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-67 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION NR.Policy 3.2. Recognize and consult soil classifications during the land use review process. An understanding of the general soil conditions assists in the design and construction of the site, although only hazard conditions should be considered an actual constraint to development. A subsurface geotechnical investigation of geologic conditions utilizing soil and rock borings will be completed during design to further determine the subsurface soil conditions and associated geological hazards for the TWP. Mitigation measures will be further refined during design to meet site -specific geological hazards and BMPs will be implemented during construction under the SWMP to minimize or mitigate soil erosion. Permanent stormwater detention will be constructed as required by Weld County Storm Drainage Criteria to mitigate erosion from surface runoff. A total of six NRCS soil reports were prepared for the TWP using the WSS application (https://websoilsurvey.sc.egov.usda.gov/App/WebSoilSurvey.aspx). The items addressed by these reports include the water pipeline, water tank, and pump stations. Reports are included in Appendix D and additional information, including potential mitigation measures, is presented in Section 24. A desktop review was conducted to identify the potential for geologic hazards along the TWP. Colorado Geological Survey publishes information about geologic hazards such as abandoned mine lands, avalanches, collapsible soils, corrosive soils, debris flows/mudslides, earthquakes, subsidence, heaving bedrock, landslides, rockfall, and swelling soils. Available maps were reviewed for indications of known geologic hazards. In addition, Weld County's GIS Digital Database, which includes identified geological hazards, was evaluated during the review. Based on the desktop review, the majority of the TWP has no identified geologic hazards and the hazards identified are not considered "active". Weld County's GIS Data shows two inactive faults along the water pipeline alignment. Based upon mapping conducted by the Colorado Geological Survey (Colorado Earthquake Hazards Mitigation Council, 2013), the mapped faults identified in Weld County's GIS Data are not identified as quaternary faults (i.e. faults which have been active in the past 1.8 million years) and as such are generally not considered "active". Due to the inactivity of the faults and the lack of recorded earthquakes in the area, the risk of shallow earthquakes and ground movements is considered low. Construction risks therefore are limited to poor rock conditions (i.e. fault breccia and gouge), spatially rapid changes in ground conditions across fault zones, and the potential for perched water conditions. Weld County's GIS Data does not show abandoned coal mines along the water pipeline alignment. The water pipeline crosses the historical Boulder -Weld coal field with abandoned mine workings identified at a range of depths, with subsidence features having been reported in regions of relatively shallow mining. A review was conducted of USGS Geologic Investigations Series 1-2735, Version 1.0 (Roberts, Hynes, and Woodward, 2001) maps showing the extent of mining, locations of mine -shafts, adits, air shafts, and bedrock faults, and thickness of overburden above abandoned coal mines in the Boulder -Weld coal field, Boulder, Weld, and Adams Counties. The maps do not indicate undermined areas along the water pipeline alignment. The Colorado Landslide Inventory Map Viewer, (Colorado Geological Survey) was evaluated to view records regarding landslides in Colorado. The viewer contains polygon records of landslides and unstable slope areas digitized from multiple sources and multiple scales by the Colorado Geologic Survey. The viewer does not indicate records of landslides nor unstable slope areas along the water pipeline alignment. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-68 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION NR. Goal4 Support the health, preservation and uses of the grassland areas of the County. NR.Policy 4.1. Support the responsible use of dryland grass areas of the County for ranching, farming, mineral extraction and other beneficial uses. The easements needed for the water pipeline will grant Thornton an area to construct, operate, and maintain the water pipeline, and property owners will maintain fee title to the land. Property owners can continue to use the land within the easement area for purposes such as farming, ranching or other beneficial uses, so long as such uses do not interfere with or endanger the operation of the TWP. The majority of the impacts on vegetation will be temporary during construction of the water pipeline and long-term impacts to native vegetation communities are not expected. Disturbed areas will be restored to pre -construction grades and revegetated where appropriate after construction. Areas disturbed for water tank and pump station sites that are not designated for infrastructure, such as tank/forebay, buildings, parking and access areas, and equipment will be revegetated where appropriate after construction. Restored vegetation will be comparable to existing vegetation. Certified weed -free seed mix consisting of drought -tolerant native grasses and other types of vegetation as appropriate to meet property owner's reasonable preferences or regulatory requirements will be specified in the SWMP for the revegetation of disturbed. Disturbed mature vegetation will be replaced, per a property owner's reasonable request, with a like species. Potential future repairs and maintenance could affect discrete areas of vegetation when the water pipeline is accessed in a particular location. Any vegetated areas disturbed during maintenance or required repairs will be restored by the methods used during construction. NR.Goal 6. Support efforts to record and preserve archeological, cultural and historic resources. A Class I File Search and Literature Review for cultural resources was conducted. Based on that review, there are no cultural sites or structures that are listed on the State and National Register of Historic places within the TWP within unincorporated Weld County. Additional information on natural and cultural resources within the TWP is presented in Appendix A, Natural and Cultural Resource Assessment. Information provided includes mitigation measures that could be implemented for the TWP, if required. ECON.Goal 1. Encourage the expansion of existing businesses and the location of new industries that will provide employment opportunities in the County. The TWP contractors will provide construction crews that are not anticipated to exceed approximately 100 workers at any one time. Some workers may reside outside of the local areas and will require lodging or temporary housing. The number of construction workers on site will depend on the contractors and the construction activity occurring during a particular time. Thornton will endorse hiring local workers. TWP contractors and construction workers will likely support local businesses to meet a need for durable and nondurable goods and services. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-69 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION ECON.Policy 1.3. Promote the preservation and enhancement of the major assets in the County - lower costs of doing business, safe communities, a qualified and available workforce and access to agricultural and natural resources - to retain current employers and attract new ones. Maintain and improve basic County services and infrastructure, in order to ensure that the County is a viable candidate for attracting businesses, labor and capital. Criteria used for developing the water pipeline location included minimizing impacts to agricultural uses. Thornton's land agents have worked with property owners along the water pipeline alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to minimize affecting the operation of irrigation equipment. The process to develop the water pipeline route was iterative, and is a result of negotiations with individual property owners or detailed land, utility, or resource surveys that revealed engineering or environmental constraints. Thornton's land agents negotiate the purchase of easements where needed based on fair market value. The easements will grant Thornton an area to construct, operate, and maintain the water pipeline, and property owners will maintain fee title to the land. Property owners can continue to use the land within the easement area for purposes such as farming, grazing, or access, so long as such uses do not interfere with or endanger the operation of the TWP. The predominant land use in the TWP area, agricultural use, is compatible with operation of the TWP because the water pipeline and fiber optic cable will be buried below the plow line. Additional measures that will be implemented to minimize impacts to irrigated agricultural land include: • Stripping and storing topsoil separately from excavated trench materials • Seeding or leaving land fallow in accordance with the individual property owner's agreed -upon reclamation procedures following construction of the water pipeline The TWP will cross multiple irrigation ditches along the water pipeline route within unincorporated Weld County as presented in Section 6. Thornton has begun outreach to each irrigation ditch company to begin coordination activities. See Appendix B for additional information on stakeholder outreach. As part of the negotiation process for acquiring easements, Thornton's land service representatives coordinate with property owners on lateral ditch crossings to limit impacts to agricultural operations. Thornton will obtain appropriate agreements for each crossing before construction. No direct effects on water flow, quantity, quality, or timing in the irrigation ditches are anticipated. Crossings will be constructed using either trenchless or open -cut methods as required by the irrigation ditch company and during times the ditch is not running, if required. The TWP will not have a negative effect on local government or any other existing public facilities and services. The construction, operation, and maintenance of the underground water pipeline and appurtenances will not require any new public facilities or impact existing services such as police, fire, water, waste water, and healthcare. To determine the water pipeline route least impactful to local communities, Thornton, in 2015, conducted a series of outreach meetings with local governments and agencies that could be impacted by the TWP. During the outreach meetings with each local government and agency, feedback was collected to determine preference(s) and/or determine potential problems, including TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-70 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION planned developments, for the location of the water pipeline within the local government or agency's jurisdictional and/or GMA boundaries. Comprehensive Plan 2020 Conformance 2020 Guiding Principles Comprehensive Plan 2020, Guiding Principles are the foundation for land use policy in Weld County. Thornton intends to comply with the guiding principles of the Comprehensive Plan 2020 relevant to the TWP. Respecting Our Agricultural Heritage Criteria used for developing the water pipeline location included minimizing impacts to agricultural uses. Thornton's land agents have worked with property owners along the water pipeline alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to minimize affecting the operation of irrigation equipment. The process to develop the water pipeline route was iterative, and is a result of negotiations with individual property owners or detailed land, utility, or resource surveys that revealed engineering or environmental constraints. Thornton's land agents negotiate the purchase of easements where needed based on fair market value. The easements will grant Thornton an area to construct, operate, and maintain the water pipeline, and property owners will maintain fee title to the land. Property owners can continue to use the land within the easement area for purposes such as farming, grazing, or access, so long as such uses do not interfere with or endanger the operation of the TWP. The predominant land use in the TWP area, agricultural use, is compatible with operation of the TWP because the water pipeline and fiber optic cable will be buried below the plow line. Additional measures that will be implemented to minimize impacts to irrigated agricultural land include: + Stripping and storing topsoil separately from excavated trench materials + Seeding or leaving land fallow in accordance with the individual property owner's agreed -upon reclamation procedures following construction of the water pipeline The TWP will cross multiple irrigation ditches along the water pipeline route within unincorporated Weld County as presented in Section 6. Thornton has begun outreach to each irrigation ditch company to begin coordination activities. See Appendix B for additional information on stakeholder outreach. As part of the negotiation process for acquiring easements, Thornton's land agents coordinate with property owners on lateral ditch crossings to limit impacts to agricultural operations. Thornton will obtain appropriate agreements for each crossing before construction. No direct effects on water flow, quantity, quality, or timing in the irrigation ditches are anticipated. Crossings will be constructed using either trenchless or open -cut methods as required by the irrigation ditch company and during times the ditch is not running, if required. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-71 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Existing use, including agricultural use, in areas surrounding the water tank can continue. The site for Pump Station 1 is located on vacant land of which approximately 75 percent is leased for irrigated farming and the remaining 25 percent is not used. The site is part of a larger parcel used for irrigated agriculture and oil and gas development. Existing use, including agricultural use, in areas surrounding the pump station can continue. The site for Pump Station 2 is vacant land adjacent to County Road 17 and County Road 2 and is currently not being used, but in the past has been used for growing non -irrigated grass hay that was is cut for feed. Existing use, including agricultural use, in areas surrounding the pump station can continue. Respecting Private Property Rights Thornton has purchased easements and land through good -faith negotiations with property owners, and only used eminent domain when all other reasonable options have been explored. Thornton's land agents have worked with property owners along the TWP alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to limit impacts to the operation of irrigation equipment, structures, trees, and other infrastructure. The process to develop the water pipeline route was iterative, and is a result of negotiations with individual property owners, or is a result of detailed land, utility, or resource surveys that revealed engineering or environmental constraints. The TWP is developed in a manner that is respectful of private property rights. Promoting Economic Growth and Stability The TWP will not have a negative effect on the economic growth of local government or any other existing public facilities and services. The construction, operation, and maintenance of the underground water pipeline and appurtenances will not require any new public facilities or impact existing services such as police, fire, water, waste water, and healthcare. Thornton has purchased easements and land through good -faith negotiations with property owners and only used eminent domain when all other reasonable options have been explored. To determine the water pipeline route least impactful to local communities, Thornton, in 2015, conducted a series of outreach meetings with local governments and agencies that could be impacted by the TWP. During the outreach meetings with each local government and agency, feedback was collected to determine preference(s) and/or determine potential problems, including planned developments, for the location of the water pipeline within the local government or agency's jurisdictional and/or GMA boundaries. The TWP construction contractors will provide crews that are not anticipated to exceed approximately 100 workers at any one time. Some workers may reside outside of the local areas and will require lodging or temporary housing. The number of construction workers on site will depend on the contractors and the construction activity occurring during a particular time. Thornton will endorse hiring local workers. TWP contractors and construction workers will likely support local businesses to meet a need for durable and nondurable goods and services. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-72 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Protecting Health, Safety, and General Welfare Environmental Hazards Thornton and the TWP contractors will provide and maintain sanitary accommodations for the use of their employees during construction of the TWP in a manner that complies with the requirements and regulations of health departments and other governmental bodies. These accommodations, including trash dumpsters and portable toilets, will be located in several locations along the TWP alignment based on the general plan for construction. TWP contractors will be responsible for supplying and maintaining portable toilets. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws and regulations and that they screen portable toilets from the general public. Construction waste will be stockpiled in construction staging areas and removed from the construction site during the construction process. Trash dumpsters will be emptied approximately every 1 to 2 weeks. The TWP will not include the need for permanent dumpsters or sanitary facilities for domestic purposes as the water tank, pump stations, and underground water pipeline will be unmanned. Construction activities will follow best management practices for the management of wastes to avoid and minimize impacts from potential spills or other releases to the environment. These practices discussed in greater detail below will protect the health, safety and welfare of the inhabitants of Weld County. Hazardous Materials and Waste Management Mitigation Measures Construction, operation, and maintenance activities involving Thornton or the TWP contractors bringing any hazardous materials onto the site will comply with applicable federal, state, and local laws and regulations regarding the handling, storage, disposal, transportation, and use of hazardous substances. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws. If trenching activities uncover previously unknown areas of contamination that are apparent, work will be stopped until the party responsible for such contamination has properly managed and/or disposed of such contamination. Construction staging areas will be located and arranged in a manner to preserve trees and vegetation to the extent feasible. Excavated material or other construction materials will not be stockpiled or deposited near or on stream banks or other watercourse perimeters where they could be washed away by high water or storm runoff, or could encroach upon stream banks. Best management practices (BMPs) will be implemented for stormwater management. A summary of BMPs to protect water resources from potential contamination is provided in Appendix C. These practices will protect the health, safety and welfare of the inhabitants of Weld County. Fueling Mitigation and Safety Measures TWP Construction If possible, fueling requirements will be met before arrival at the construction site. Heavy equipment left on site for construction activities will require onsite fueling at staging areas or the construction site. No bulk fuel storage is anticipated to occur on site. Fueling vehicles will be equipped with spill kits and fire extinguishers, and personnel will be properly trained in spill prevention, control, and countermeasures. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-73 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION To minimize the potential for a spill during fuel transfers and be prepared in the event of a spill, the following measures, as provided in the Code of Colorado Regulations [CCR] and Code of Federal Regulations [CFR], will be followed during loading/unloading of fuel: + Keep fire away while loading/unloading. Persons in the vicinity are forbidden to smoke, light matches, or carry any flame or lighted cigar, pipe, or cigarette. 49CFR 177.834(c, d). + Fuel will not be loaded/unloaded from any motor vehicle while the engine is running. The exception is when the engine of the vehicle is to be used in the operation of the pump. 49CFR 177.837(a). + The fuel tank records will be reviewed to determine the theoretical fuel tank level. 7CCR 1101- 14 S2-3-1 and S2 -4-2(a)(2.) • The fuel tank level gauge will be inspected to determine the actual fuel tank level before unloading takes place. (Note: Any fuel tank level discrepancies will be resolved before hooking up to the fuel tank.) 7CCR 1101-14 S2-3-1 & 52-4-2(a)(2). • The supply truck driver will observe the transfer during the entire operation. 49CFR 177.834(i)(2). • Once the truck is in position, its emergency brake will be applied and reasonable precautions will be taken to prevent motion of the truck during unloading (example: utilize wheel chocks when parked on an incline). 49CFR 177.834(e). • Signs must be posted that remind drivers not to pull away before detaching hoses. 40CFR 112.7(h)(3). + Containers and cargo tanks will be grounded before and during transfer. 49CFR 177.837(b) & (c). • The transfer line must be properly disengaged, and the valves and piping of both the fuel tank and truck must be checked for leaks before allowing the truck to leave the site. (40CFR 112.7 h(4) for trucks). TWP Post -construction If feasible, backup power for the pump stations will be provided by a second feed from the applicable utility provider. Should a second feed not be available, or require significant improvements to the utility grid, backup diesel generators will be installed at both pump stations. The amount of fuel stored will be that required for 36 hours of operation at full load. At Pump Station 1, three 2 -megawatt (MW) diesel generators with approximately 4,150 -gallon underbelly tanks will be installed, if required. In this arrangement, approximately 12,500 gallons of diesel fuel will be stored onsite. At Pump Station 2, three 2 -MW diesel generators with approximately 4,150 -gallon underbelly tanks will be installed, if required. In this arrangement, approximately 12,500 gallons of diesel fuel will be stored onsite. The following measures will be followed for installation and operation of diesel fuel storage installed as part of any emergency generators included with the pump stations: • Location of fuel tanks will comply with required separation distances. 7CCR 1101-14 S3-2-2-4 + Application for Permit for Above Ground Storage Tank (AST) will be submitted and obtained for installation of diesel fuel storage tanks. 7CCR S3-2-3 + Spill and overfill protection will be provided during operation, including secondary containment equal to or greater than the volume of diesel fuel being stored. 7CCR 1101-14 S3-3-1 TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-74 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • Release detection will be provided. 7CCR 1101-14 S3-3-3 • Testing and compliance inspections will be completed per applicable code(s). 7CCR S3-3-4. These practices will protect the health, safety and welfare of the inhabitants of Weld County. Traffic and Roads and Mitigation Measures Impacts caused by construction equipment and activity on Weld County roads will be short term during construction. Access will be maintained for local area residents. Emergency vehicle access needs will be maintained and construction activities coordinated with local fire departments, police departments, ambulance services, and other emergency responders as necessary. Thornton places a high priority on safety during construction. Thornton will coordinate with local school districts regarding construction and haul routes and school bus traffic. TWP contractors will implement traffic management plans based upon local traffic control requirements and general safe operating practices. Proper signage, flaggers, lighting, speed limits, work hours, postings, notifications, and other precautionary safety measures will be taken to protect the residents of Weld County and the TWP contractors' employees. The water pipeline construction will utilize trenchless construction methods under Weld County roads where required by Weld County, resulting in little to no disruption to traffic at those locations. Temporary traffic delays and detours will be needed where the water pipeline is installed by open - cut construction across existing roads. Traffic disruption will be temporary, and will cease after construction. Traffic control plans will be implemented before construction, subject to approval and acquisition of permits from Weld County Engineering. If open -cut construction is approved by Weld County at road crossings, Table C.2.i presents the number of anticipated days to construct the water pipeline and restore ROW for various road functional classifications. TABLE C.2.i Anticipated Water Pipeline Construction and Restoration Times for Open -cut Method for Road Crossings Road Classification ROW Road Surface Anticipated Anticipated Anticipated Length Closure Number of Days Number of Days for Water Pipeline for ROW Installation Restoration Local Local Collector Collector Arterial 60 Gravel Full 60 Paved Full 80 Gravel Partial 80 Paved Partial 140 Paved Partial 2 2 2 2 3 2 2 2 3 3 Additional information and mitigation measures are presented in Section 17, Traffic Narrative. These practices will protect the health, safety and welfare of the inhabitants of Weld County. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-75 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Operations One of the greatest risks to buried pipelines is excavation by individuals unaware of the location of a pipeline. Pipeline markers will be installed in the pipeline permanent easement to indicate that a water pipeline is buried nearby. The markers will identify the water pipeline, Thornton as the pipeline operator, the operator's 24 -hour emergency contact number, and the area's utility notification number. Marking tape indicating that a water pipeline is buried in the location will also be installed above the water pipeline for the entire length of the water pipeline. The majority of the water pipeline in unincorporated Weld County will be located within permanent easements. This approach reduces the probability that individuals could damage the water pipeline with ground - disturbing activities. The water pipeline will be designed and constructed to be water tight. Pipe materials will be required to undergo shop testing before installation as well as hydrostatic field testing after installation. The water pipeline and appurtenances will be coated and lined to prevent corrosion. As an additional safety measure, project components will be installed with cathodic protection, which will control the corrosion of a metal surface. Cathodic protection systems are commonly used to protect metallic water pipelines. These practices will protect the health, safety and welfare of the inhabitants of Weld County. 2020 Goals and Objectives The Comprehensive Plan 2020 contains goals that are desired ambitions and results to be pursued by Weld County within unincorporated areas of Weld County. The objectives help clarify the goal's intent. The goals are divided into categories of land use, economic development, environmental, and natural resource. Many of the policies are areas not directly related to the TWP. For this reason, the following discussion addresses only those goals and objectives relevant to the TWP. The information provided herein demonstrates that the TWP is consistent with the goals and objectives of the Comprehensive Plan 2020. 2020 Land Use Goals and Objectives Goal 22-2-30 A Commit to the economic future of agriculture. Objective 22-2-30 A.1 Land use changes should not inhibit agricultural production nor operations. The TWP is a low impact, passive use that is consistent with the agricultural uses. The TWP is not anticipated to impact standard agricultural practices once the water pipeline is installed. The water pipeline and fiber optic cable will be buried below the plow line to prevent interference with anticipated agricultural uses. In addition, land use effects on agricultural uses will be temporary during construction and are anticipated to be minimal after construction. The water pipeline alignment is generally located parallel to property lines or adjacent to Weld County future ROW minimizing the effects to agriculture. Agricultural uses such as farming, grazing, or access within the permanent easement can continue after construction so long as such uses do not interfere with or endanger the operation of the TWP. Criteria used for developing the water pipeline location included minimizing impacts to agricultural uses. Thornton's land agents have worked with property owners along the water pipeline alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-76 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION routing the water pipeline to minimize affecting the operation of irrigation equipment. The process to develop the water pipeline route was iterative, and is a result of negotiations with individual property owners or detailed land, utility, or resource surveys that revealed engineering or environmental constraints. Thornton's land agents negotiated the purchase of easements where needed based on fair market value. The easements will grant Thornton an area to construct, operate, and maintain the water pipeline, and property owners will maintain fee title to the land. Property owners can continue to use the land within the easement area for purposes such as farming, grazing, or access, so long as such uses do not interfere with or endanger the operation of the TWP. The predominant land use in the TWP area, agricultural use, is compatible with operation of the TWP because the water pipeline and fiber optic cable will be buried below the plow line. Additional measures that will be implemented to minimize impacts to irrigated agricultural land include: • Stripping and storing topsoil separately from excavated trench materials • Seeding or leaving land fallow in accordance with the individual property owner's agreed -upon reclamation procedures following construction of the water pipeline The TWP will cross multiple irrigation ditches along the water pipeline route within unincorporated Weld County as presented in Section 6. Thornton has begun outreach to each irrigation ditch company to begin coordination activities. See Appendix B for additional information on stakeholder outreach. As part of the negotiation process for acquiring easements, Thornton's land agents coordinate with property owners on lateral ditch crossings to limit impacts to agricultural operations. Thornton will obtain appropriate agreements for each crossing before construction. No direct effects on water flow, quantity, quality, or timing in the irrigation ditches are anticipated. Crossings will be constructed using either trenchless or open -cut methods as required by the irrigation ditch company and during times the ditch is not running, if required. Objective 22-2-30 A.2 Limit the density and intensity of development to maintain agricultural areas. The TWP will not increase density or intensity of development in unincorporated Weld County. The water pipeline and fiber optic cable will be buried, and land use effects on agricultural and other similar use will be temporary during construction and are anticipated to be minimal after construction. Agricultural use within the permanent easement will be able to continue after construction so long as such uses do not interfere with or endanger the operation of the TWP. Objective 22-2-30 A.3 Respect agricultural practices regarding water resources. Impacts to existing water use facilities will be managed and mitigated. The TWP route was located to minimize impacts to water supply storage facilities. The TWP will cross water supply conveyances and infrastructure, such as irrigation ditches and pipelines conveying raw and domestic water service. The TWP will cross multiple irrigation ditches along the water pipeline route within unincorporated Weld County as presented in Section 6. Thornton has begun outreach to each irrigation ditch company to begin coordination activities. See Appendix B for additional information on stakeholder outreach. As part of the negotiation process for acquiring easements, Thornton's land agents coordinate with property owners on lateral ditch crossings to limit impacts to agricultural operations. Thornton will obtain appropriate agreements for each crossing before construction. No direct effects on water flow, quantity, quality, or timing in the irrigation ditches are anticipated. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-77 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Crossings will be constructed using either trenchless or open -cut methods as required by the irrigation ditch company and during times the ditch is not running, if required. Goal 22-2-30 C Harmonize development with surrounding land uses. Objective 22-2-30 C.3 Encourage development that preserves land for agriculture, rangeland, wetlands, and critical habitat. The TWP is a low impact, passive use that is consistent with the agricultural uses. The TWP is not anticipated to impact standard agricultural practices once the water pipeline is installed. The water pipeline and fiber optic cable will be buried below the plow line to prevent interference with anticipated agricultural uses. In addition, land use effects on agricultural uses will be temporary during construction and are anticipated to be minimal after construction. The water pipeline alignment is generally located parallel to property lines or adjacent to Weld County future ROW minimizing the effects to agriculture. Agricultural uses such as farming, grazing, or access within the permanent easement can continue after construction so long as such uses do not interfere with or endanger the operation of the TWP. The TWP will utilize trenchless construction methods for water pipeline installation to minimize impacts to natural resources such as jurisdictional waters and wildlife habitat associated with those areas. The area disturbed in constructing the water pipeline will be restored to pre -construction conditions, including grade and vegetation, minimizing long-term impacts to wildlife. The TWP was assessed for potential jurisdictional waters and wildlife habitat using publicly available mapping and aerial photographs, and by conducting a windshield survey of areas that could be publicly accessed. Information on terrestrial and aquatic animals was obtained from various sources including Colorado Parks and Wildlife, Colorado Natural Diversity Information System, Colorado Natural Heritage Program, U.S. Fish and Wildlife Service, published literature, and field surveys. Site surveys will be performed to aid in the determination of jurisdictional waters and wildlife habitat. Information from the assessment and survey information will be used to develop final design. Mitigation methods to minimize impacts to these areas will be incorporated into the design and construction as appropriate. Jurisdictional water crossings will be constructed using trenchless construction methods. An assessment was conducted for potential habitat of federally threatened, endangered, and candidate species protected under the Endangered Species Act. The TWP will have no effect on federally listed threatened, endangered, or candidate wildlife or plant species. Mitigation measures such as restricting construction during nesting seasons may be implemented as appropriate. Additional information can be found in the Revised Natural and Cultural Resources Assessment in Appendix A. Impacts to these areas will be temporary and only occur while the water pipeline construction is taking place. After construction is completed, the area will be restored to pre -construction grades and vegetation. Additional information including mitigation measures to minimize impacts to wildlife can be found in the Revised Natural and Cultural Resources Assessment in Appendix A. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-78 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Goal 22-2-30 D Collaborate on County -wide transportation and land use plans. Objective 22-2-30 D.2 Ensure that land use change proposals comply with applicable transportation plans, functional classifications, and access control plans adopted by the County. The TWP was reviewed in conjunction with the area goals and transportation improvement plans outlined in the Weld County 2045 Transportation Plan, (Weld County, 2020). The Weld County 2045 Transportation Plan identifies multiple short range, mid -range, and long-range improvement needs within the TWP area. If these improvement projects occur within the timeframe of the construction of the TWP ("overlap"), Thornton will work with Weld County and other involved parties to coordinate construction and minimize disruption. Short range improvement projects identified in the Weld County 2045 Transportation Plan that overlap the TWP include the following: + County Road 54 from County Road 13 to County Road 15 rebuild and widen to add shoulders • County Road 2 Access Control Plan from County Road 11 to Interstate 76 Mid -range improvement projects identified in the Weld County 2045 Transportation Plan that overlap the TWP include the following: + County Road 17 from County Road 32 to Colorado Highway 66 rebuild and widen to add shoulders + County Road 17 Access Control Plan from Colorado Highway 66 to Crossroads Boulevard Long range transportation improvement projects identified in the Weld County 2045 Transportation Plan that overlap the TWP include the following: • Improve County Road 13 widen to 3 lane Collector Standard from County Road 48.5 to County Road 54 • Drainage Improvements + Colorado Highway 66 and County Road 17 (north and south) intersection improvement (signal or roundabout) Thornton reviewed GMA boundaries and transportation master plans for Berthoud, Dacono Firestone, Frederick, Fort Lupton, Johnstown, Mead, Milliken, Platteville, Severance, Timnath, and Windsor, to determine the extent of future ROW within GMA boundaries. Thornton will coordinate the location of the water pipeline with these municipalities as appropriate where the water pipeline is located within the municipality's boundary. 22-2-40 Economic Development Goals and Objectives Goal 22-2-40 A Support compatible economic development opportunities. Objective 22-2-40 A.2 Foster partnerships that increase the predictability or certainty of economic development and limit jurisdictional competition. The TWP contractors will provide construction crews that are not anticipated to exceed approximately 100 workers at any one time. Some workers may reside outside of the local areas and will require lodging or temporary housing. The number of construction workers on site will depend on the contractors and the construction activity occurring during a particular time. Thornton will endorse hiring local workers. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-79 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TWP contractors and construction workers will likely support local businesses to meet a need for durable and nondurable goods and services. Environmental Goals and Objectives Goal 22-2-50 A Encourage responsible and sustainable water usage. Objective 22-2-50 A.1 Connection to public water and sewer services shall be taken into consideration for development approval. During construction, water may be purchased from local water providers for construction activities such as watering the construction site to mitigate fugitive dust or hydrostatically testing the water pipeline. Contractors will provide bottled water, water cooler service, or other temporary source of drinking water during construction. Temporary water sources could include nearby fire hydrants or water pipelines. Thornton and/or TWP contractors will negotiate purchase of water deliveries from municipal and/or private sources. The TWP will not include the need for a permanent water supply for domestic purposes as the water tank, pump stations, and underground water pipeline will be unmanned. During construction, portable toilets will be placed in several locations along the TWP construction site based on the general plan for construction. TWP contractors will be responsible for supplying and maintaining portable toilets. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws and regulations and that they screen portable toilets from the general public. The TWP will not include the need for permanent sanitary facilities for domestic purposes as the water tank, pump stations, and underground water pipeline will be unmanned. Goal 22 -2 -SD B Protect water quality in the County. Objective 22-2-50 B.1 Support reduction of stormwater erosion and runoff. Prior to construction, Thornton and/or the TWP contractors will obtain the required Weld County grading permit, and a Stormwater Discharge Associated with Construction Activity— General Permit from CDPHE. Construction SWMPs will be developed under the general permit to protect the quality of stormwater runoff during construction in accordance with the Construction Stormwater Discharge Permit requirements. Surface drainage BMPs implemented during construction will include application of erosion control techniques and the successful revegetation of disturbed areas. BMPs will be maintained and inspected. Site inspections will be conducted to meet the requirements and schedules stipulated under the permits. Failed BMPs will be replaced as required. After work is complete and final stabilization has been achieved, temporary BMPs will be removed. Final stabilization will be reached as defined in the Weld County Grading Permit and Stormwater Discharge Associated with Construction Activity - General Permit. Weld County Online Mopping was reviewed and the TWP does not fall within any areas designated as municipal separate storm sewer system (MS4). Surface drainage stormwater BMPs will include application of erosion control techniques and the successful revegetation of disturbed areas. The required Weld County grading permit and CDPHE construction stormwater permits and SWMPs will include detailed descriptions of BMPs that will be used to protect surface hydrology and water quality. No permanent stormwater facilities are anticipated to be required for the water pipeline and water tank; drainage narratives are provided in Section 16 and Volume 4. Preliminary drainage reports TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-80 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION have been developed for the pump station locations and those reports are included in Section 16. Based on the preliminary analysis, detention ponds are anticipated to be required at the pump station sites and preliminary siting of stormwater facilities are shown on the USR maps and are presented in Section 16. Stormwater facilities will be designed and constructed in accordance with Weld County and other requirements as applicable. If used by the TWP contractors and in accordance with Weld County staff recommended conditions of approval, drainage narratives for staging areas will be submitted before start of construction. Objective 22-2-50 8.3 Prevent surface and groundwater contamination. Mitigation measures that could be implemented with the TWP to minimize impacts to groundwater include the following: • Installation of trench plugs constructed of impervious materials such as bentonite, other clays, or controlled low -strength material within the water pipeline trench. Trench plugs serve as dams that mitigate groundwater flow paths that could develop through typical water pipeline bedding material. Trench plugs could be installed periodically along and perpendicular to the water pipeline to deflect flow into native ground to maintain the natural hydrology. • Installation of an impervious water pipeline trench backfill material such as bentonite, other clays, or controlled low -strength material to mitigate groundwater levels and groundwater flow paths. • Compacting backfill material and soil disturbed during trenching. Compact with a backhoe, vibration machine, rollers, or other equipment. Compaction requirements and testing would be specified in accordance with standards of practice. • Installation of porous backfill material to allow natural groundwater flow paths to flow around the water pipeline. Dewatering groundwater in trench excavation prior to water pipeline installation. Groundwater encountered in the excavations will be addressed in accordance with CDPHE regulations and the requirements of the construction dewatering permits. Groundwater is likely to be collected and pumped into either temporary retention ponds, land applied, or routed to appropriate storm drains in accordance with the dewatering permits. Additional example BMPs and descriptions that could be used on the TWP are provided for reference in Appendix C. The mitigation measures to be implemented will be specified in the construction documents and will be developed as part of the design process, including evaluation of geotechnical investigations. Construction wastewater associated with the potential dewatering of trenches will be handled in accordance with CDPHE permit discharge requirements. Prior to construction, Thornton and/or the TWP contractors will obtain a General Permit for Construction Dewatering Activities from CDPHE and specify the management measures to capture and manage any generated discharge. BMPs will also be deployed for construction dewatering activities, pursuant to the Construction Stormwater Discharge Permit and/or the Construction Dewatering Discharge Permit as appropriate for the site conditions and soil erodibility, to protect the quality of stormwater, surface water, and groundwater during construction of the TWP. The TWP will be hydrostatically tested prior to operation start up. Before discharge of hydrostatic test water from the water pipeline, Thornton and/or the TWP contractor will obtain a General TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-81 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Permit for Discharges from Hydrostatic Testing of Pipelines, Tanks, and Similar Vessels from CDPHE. Sampling and effluent limits will be in accordance with permit requirements. Appropriate criteria manuals and standards will be used for the development of the SWMPs and selection of BMPs. Manuals may include the Urban Storm Drainage Criteria Manual (USDCM) Volume 3 (Urban Drainage and Flood Control District, 2010, November), City of Greeley's BMPs for Utility Planning and Construction Through Rural, Wetland, and Riparian Lands (Leonard Rice Engineers, Inc., 2008, August), and/or other state and local guidance documents. Lists of example descriptions of common construction BMPs that could be used on the project are provided for reference purposes in Appendix C. These lists are not all inclusive. Items listed, and/or other construction BMPs, will be selected as appropriate based on site -specific conditions. Development of the TWP route considered pipeline construction locations that minimize impacts to historical surface and subsurface water flows in the project area. Pipeline crossings of jurisdictional waters, including wetlands, will be constructed utilizing trenchless construction methods. This construction method will eliminate surface disturbance to the waterbody and effects on water quality. The TWP will cross multiple open waters, riparian areas, and wetlands, additional information can be found the Revised Natural and Cultural Resources Assessment in Appendix A. To protect water resources from potential contamination, construction staging areas will be located and arranged in a manner to preserve trees and vegetation to the extent feasible. Excavated material or other construction materials will not be stockpiled or deposited near or on stream banks or other watercourse perimeters where they could be washed away by high water or storm runoff, or could encroach upon stream banks. Best management practices will be implemented for stormwater management. Additional information to protect water resources from potential contamination is provided in Section C.2.c and Appendix C. No permanent stormwater facilities are anticipated to be required for the water pipeline and water tank; drainage narratives are provided in Section 16 and Volume 4. Preliminary drainage reports have been developed for the pump station locations and those reports are included in Section 16. Based on the preliminary analysis, detention ponds are anticipated to be required at the pump station sites and preliminary siting of stormwater facilities are shown on the USR maps and are presented in Section 16. Stormwaterfacilities will be designed and constructed in accordance with Weld County and other requirements as applicable. If used by the TWP contractors and in accordance with Weld County staff recommended conditions of approval, drainage narratives for staging areas will be submitted before start of construction. Construction activities will comply with applicable federal, state, and local laws and regulation regarding the use of hazardous substances as described in Section C.2.f. Goal 22-2-50 C Minimize flood losses. The TWP will not alter floodplains. The water pipeline will utilize trench less construction methods under waterbody crossings such as WOTUS (jurisdictional waters), including streams, rivers, lakes, and wetland areas. Work conducted within the floodplain fringe areas will be restored to pre - construction conditions and grades. Therefore, the TWP will mitigate impacts on the hydraulics and hydrology of the floodplain. Thornton will obtain Floodplain Development permits and other approvals as required for floodplain crossings from Weld County or other agency as required after design has progressed. Information will be provided to Weld County as required to obtain permits. Floodplain crossings will utilize open -cut construction in the fringe area of the floodplain and trenchless construction methods under the ordinary high water mark and associated wetlands so TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-82 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION that there will be no impact to jurisdictional waters. Spoils from trench excavations, construction - related equipment, materials, and supplies will be stored outside of the 100 -year floodplain per local floodplain regulations. Fringe areas using open -cut construction will be restored to pre - construction grades and vegetation after construction. Trenchless construction methods could include methods such as tunneling or auger boring techniques. Where trench less construction methods are used, shafts will be located on either side of the water resource for launching and receiving the water pipeline and the fiber optic cable and will be located outside of the normal high water mark and associated wetlands. Shafts will be backfilled and compacted, and affected areas will be restored to pre -construction conditions. A geotechnical investigation of geologic conditions near crossing locations will be completed during design. Currently, no areas have been identified that may pose a risk to trenchless construction methods; however, should any such locations be identified throughout the geotechnical investigation, Thornton will consult with applicable parties as required, including the affected property owners, Weld County, and other agencies to develop an alternative approach that will minimize impacts. Natural Resources Goals and Objectives Goal 22-2-60 A Preserve wetlands and critical habitats. Objective 22-2-60 A.1 Wetland and critical or unique habitat areas, such as habitats of endangered or unique species, and migration, breeding, and spawning areas should be identified in application materials as potential limiting site factors. Information on wetland and critical or unique habitat areas are included in the Revised Natural and Cultural Resources Assessment in Appendix A. The TWP will utilize trenchless construction methods for water pipeline installation to minimize impacts to natural resources such as jurisdictional waters and wildlife habitat associated with those areas. The area disturbed in constructing the water pipeline will be restored to pre -construction conditions, including grade and vegetation, minimizing long-term impacts to wildlife. The TWP was assessed for potential jurisdictional waters and wildlife habitat using publicly available mapping and aerial photographs, and by conducting a windshield survey of areas that could be publicly accessed. Information on terrestrial and aquatic animals was obtained from various sources including Colorado Parks and Wildlife, Colorado Natural Diversity Information System, Colorado Natural Heritage Program, U.S. Fish and Wildlife Service, published literature, and field surveys. Site surveys will be performed to aid in the determination of jurisdictional waters and wildlife habitat. Information from the assessment and survey information will be used to develop final design. Mitigation methods to minimize impacts to these areas will be incorporated into the design and construction as appropriate. Jurisdictional water crossings will be constructed using trenchless construction methods. Impacts to these areas will be temporary and only occur while the water pipeline construction is taking place. After construction is completed, the area will be restored to pre -construction grades and vegetation. Additional information including mitigation measures to minimize impacts to wildlife can be found in the Revised Natural and Cultural Resources Assessment in Appendix A. An assessment was conducted for potential habitat of federally threatened, endangered, and candidate species protected under the Endangered Species Act. The TWP will have no effect on federally listed threatened, endangered, or candidate wildlife or plant species. Mitigation measures such as restricting construction during nesting seasons may be implemented as appropriate. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-83 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Additional information can be found in the Revised Natural and Cultural Resources Assessment in Appendix A. Along the water pipeline alignment, impacts to these areas will be temporary and only occur while the water pipeline construction is taking place. After construction is completed, the area will be restored to pre -construction grades and vegetation. An assessment of the TWP was conducted for wildlife habitat and migration corridors. A description of the ways that wildlife use the area within and near the TWP, and the species involved with proposed setbacks and other potential mitigation measures, can be found in the Revised Natural and Cultural Resources Assessment in Appendix A. The TWP could temporarily impede movement of wildlife and result in the displacement of some individuals during construction activities. During construction, wildlife crossovers (trench plugs) with ramps on each side of the trench could be installed at well-defined game trails. The water pipeline would not provide a barrier to wildlife movement over the long term because the water pipeline would be buried. Objective 22-2-50 A.2 Protect native plants by enforcing noxious weed removal. Noxious weeds within the TWP construction limits, including within Weld County ROW, will be controlled using the following IPM methods as described by the CDOA. The following methods have been developed to control noxious weeds in a manner that prevents harm to human health and to environmentally sensitive areas such as waterways and desirable vegetation including native trees. ▪ Major equipment (e.g. truck equipment and backhoes) will be cleaned by high pressure air or water spray before being delivered to the project area to avoid introducing undesirable plants and noxious weeds. + If practicable, topsoil should not be salvaged in any area densely infested with noxious weeds. • For areas where removal is not practicable or only a small area of noxious weeds is present, pre- treat all noxious weed populations in the topsoil. + Fertilizer or other soil amendments will not be used unless recommended by a revegetation specialist based on site -specific conditions. The use of fertilizers will be restricted because they can promote noxious weeds and can be detrimental to native species in the revegetation mix. • After construction is complete, all disturbed areas will be properly revegetated as quickly as possible. Prompt revegetation with appropriate species is essential for preventing the spread of noxious weeds. + Certified weed -free seed and mulch will be used for revegetation. Weed -free straw bales will be used for sediment barriers. • If stands of noxious weeds become established, weed control would be implemented following an integrated approach specific to the weed species present. • Because new control methods are continually being developed, particularly for herbicide applications, any control methods used will follow the CDOA and Weld County recommendations at the time of implementation. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-84 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Goal 22-2-608 Support responsible energy and mineral development Objective 22-2-60 8.1 Ensure that surface development reasonable accommodates mineral extraction. Thornton recognizes that the energy industry is an essential industry in Weld County. As part of the coordination process for the TWP and to help minimize impacts to the energy industry, Thornton presented the TWP at the Energy Industry Working Group (Weld County oil and gas companies) on December 15, 2016. In addition, outreach letters have been sent to initiate coordination of activities to oil and gas companies. Coordination with oil and gas companies continued during the land acquisition process to lessen impacts to existing and planned infrastructure. Where feasible, the water pipeline easement overlaps nonexclusive oil and gas easements and the water pipeline will be located outside of the overlapping easement to minimize both property owner and oil and gas impacts. C.2.j. A Decommissioning Plan. This section addresses WCC Section 23-2-510 C.2.j. Thornton has no intent to decommission the water pipeline. The water pipeline will be maintained, monitored, and repaired/replaced as needed. C.2.k. A traffic narrative describing construction traffic and permanent or temporary access points. This section addresses WCC Section 23-2-510 C.2.k and the USR Questionnaire, Engineering 1, 2, 4, and 5. Traffic information is provided in Section 17, Traffic Narrative. The following elements are discussed in Section 17: • General Transportation Information + Weld County 2045 Transportation Plan • Other Considerations o Trip Generation o Project Access o Possible Haul Routes to Be Used During Construction and the Weight of the Loads, including Delivery and Commuting Routes o Travel Distribution o Material Storage o Parking and Vehicle Storage o Construction in ROW o Permits • Mitigation Measures TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-85 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION C.2.I. A description of any haul routes to be used during construction, identifying roads and bridges involved and the weight of the loads. This section addresses WCC Section 23-2-510 C.2.land the USR Questionnaire, Engineering 1 and 2. It is anticipated that access to the water pipeline alignment will be required along Interstate 25, Interstate 25 frontage roads, Colorado Highways, County Roads and other local roads. A more detailed description of the possible haul routes and impacts to roads and the traveling public can be found in the Section 17, Traffic Narrative. Construction equipment will be transported utilizing semi -tractor and flatbed trailers, or comparable equipment, with gross vehicle weights estimated between 40,000-80,000 lbs. Construction personnel are anticipated to utilize 1 -ton pickup trucks and comparable sized vehicles. The expected haul routes include both CDOT highways and Weld County roads. Upon review of the Federal Highway Administration's 2019 National Bridge Inventory, it was determined that the project area includes bridges and structures with poor rating and not deficient rating near the TWP and along potential haul roads. Truck haul routes for material deliveries from off -site locations will be chosen to facilitate safe and expedient delivery while limiting traffic impacts. It is expected that the daily commuting route for construction workers would also follow the same roads as the truck haul routes to the construction site or temporary staging areas for parking. The major roads and highways within unincorporated Weld County that could be utilized for delivery of construction materials and construction worker trips as part of construction operations are presented in Table C.2.I. Anticipated delivery and commuting routes are shown in Figure C.2.Ia and Figure C.2.Ib. It is not expected that any road improvements or closures would be required to facilitate the transport of materials. In the event that a closure is necessary, the duration of the closure will be minimized, and Weld County standards and procedures will be followed. TABLE C.2.l Possible Haul, Delivery, and Commuting Routes County or Major Roads Colorado Highways Federal Highways County Road 2, County Road 9, County Road 10, County Road 13, County Road 15, County Road 17, County Road 18, County Road 19, County Road 20, County Road 24, County Road 26, County Road 28, County Road 32, County Road 34, County Road 36, County Road 38, County Road 40, County Road 42, County Road 44, County Road 48, County Road 50, County Road 52, County Road 54, County Road 56, County Road 681/2, E Crossroads Boulevard, E Harmony Road, E Prospect Road, County Road 84, County Road 86, County Road 88, Larimer County Road 3, Larimer County Road 50, Larimer County Road 52 Colorado Highway 14, Colorado Highway 52, Colorado Highway 66, Colorado Highway 60, Colorado Highway 392 Interstate 25, Interstate 25 Northeast Frontage Road, US Highway 34 Trip generation will vary according to the phase and location of construction. On average, five trips per day to the site are expected for each type of construction vehicle: pickup trucks, welding trucks, pipe/material hauling trucks, water trucks, and equipment transport trucks for each construction package. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-86 Thornton Water Project TRIL A 22NQ ST II'iilflli 18TH'SI; ?47 -Hsi 71ST` CR +n U JOHNSTOWN BERTHOUD CR 36 cc CR94 CR 90 iit W'I W W Nit— — h N U CR 92 r - N U U CR 66 CR P N CC U U CR66 r te U CR 46 ek 01 ra- Thornton CITY OF THORNTON COLORADO S TWP in Unincorporated a Weld County TWP outside Unincorporated Ili' Weld County —• County Boundary * Railroad River/Stream/Canal/Ditch Lake/Reservoir ♦ . Possible Haul Route Figure C.2.Ia Possible Haul Routes 12450 WASHINGTON ST THORNTON. CO 80241-2405 1/22/2021 0 0.875 1.75 1 inch = 1.75 miles Miles so -'x+ .. .i C.:MR We d Cow"!y CVO w w76966_THORNTON_NORTHERN_PROJECTITASK_ORDER_515 1_PERMITT NGCISWIAPF1IESW ELO uSRtRESOURCE_MAPSIPERMITAPP_2021 WOSSIStE HAUI_ROUTES MXO JOUAN 1O2/2021 10 53 39 AM Thornton Water Project Thornton VWATCR PHOJECT CITY OF THORNTON COLORADO 12450 WASHINGTON ST THORNTON, CO 80241-2405 1/2212021 0 S 0.875 1.75 1 inch = 1.75 miles Miles - - TWP in Unincorporated Weld County TWP outside Unincorporated Weld County County Boundary Railroad River/Stream/Canal/Ditch Lake/Reservoir 44♦ Possible Haul Route Figure C.2.lb Possible Haul Routes Sources NHD. COWR Wei° Covnty, COOT W1.4789118 THORNTON NORTHERN PROIECT\TASK ORDER 515 ' PERMITTINGIGISWAPFILESNNELD USR\RESOURCE MAPS\PERMITAPP 20n POSSIBLE HAUL ROUTES MXD 7QUAN 1/22/2021 TO 53 39 AM THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION C.2.m. Soils reports required for pipeline crossings or any pipeline encroaching in public right-of-way, if required by the Department of Public Works. This section addresses the permit application requirements described WCC Sections 23-2-510 C.2.m and 23-2-510 C.2.c and in Procedural Guide Checklist, soils report Thornton has met multiple times with staff from the Weld County Planning and Public Works Departments regarding the TWP, the USR permit application process and permit requirements. The Pre -Application meetings held on May 27, 2016, August 25, 2016, January 17, 2019, and March 13, 2020 along with follow-up meetings provided Thornton with guidance and recommendations from Weld County staff to help ensure a complete permit application submittal. Section 13 includes Pre - application meeting summaries provided by Weld County. Thornton has continued to consult with the Weld County Planning and Public Works Departments throughout the development of this Supplement 2, including periodic telephone and e-mail communications. On February 6, 2020, Weld County staff stated that a NRCS soils report is not applicable to the TWP and that providing information similar to what was provided in the December 21, 2018 Application would meet the USR application requirements. A summary of that discussion is included in section USR Procedural Guide Checklist. In addition, Public Works staff has not indicated that a soils report would be required; nevertheless, to be responsive to other WCC requirements, NRCS reports are included in Appendix D in addition to the information that was included in the December 21, 2018 Application as presented in Section 24. TWP USR SUPPLEMENT 2 SECTION C SUMMARY STATEMENT OF THE PROJECT C-89 Section D List of Property Owners This section addresses WCC Section 23-2-510 D and Procedural Guide Checklist, property owners (surface estate) list. D. A certified list of the names, addresses and the corresponding Parcel Identification Numbers assigned by the County Assessor of owners of surface properties located within one hundred fifty (150) feet of the PIPELINE - DOMESTIC WATER. The source of such list shall be the records of the County Assessor, or an ownership update from a title, abstract company, or attorney derived from such records, or from the records of the County Clerk and Recorder. If the list was assembled from the records of the County Assessor, the applicant shall certify that such list was assembled within thirty (30) days of the application submission date. Property owner information is provided in Section 5. The following information is included in Section 5: • List of surface property owners within Weld County with names, addresses, and the corresponding parcel identification numbers assigned by the Weld County Assessor • List of surface property owners within Larimer County with names, addresses, and the corresponding parcel identification numbers assigned by the Larimer County Assessor. Although Thornton is providing this list of Larimer County property owners at the request of Weld County Planning staff, Thornton does not believe that WCC Section 23-2-510 D requires this information be provided for properties located outside of Weld County. • An affidavit attesting to the accuracy of the mailing lists. The lists include properties within 150 feet on each side of the centerline of the alignment of the TWP and properties within 150 feet of the water tank and pump station sites. The lists are compiled from the records of the Weld County Assessor and Larimer County Assessor as applicable. TWP USR SUPPLEMENT 2 SECTION D LIST OF PROPERTY OWNERS D-1 Section E Irrigation Ditch, Lateral, or Pipeline Owners This section addresses WCC Section 23-2-510 E and Procedural Guide Checklist, irrigation ditch, lateral, or pipeline owners list. E. The names and addresses of any owner, operator, or user of any irrigation ditch, lateral, or pipeline that traverses the property. Section 6 provides the names and addresses of owners of irrigation ditches, laterals, or pipelines that traverse the permanent easement or temporary construction easement or water tank and pump station sites. TWP USR SUPPLEMENT 2 SECTION E IRRIGATION DITCH, LATERAL, OR PIPELINE OWNERS E-1 Section F Application Fee This section addresses WCC Section 23-2-510 F and Procedural Guide Checklist, application fee. F. The application fee. An additional fifty (50) percent of the permit fee shall be added to the cost of the application fee if the USE is started prior to issuance of a Special Review Permit. The payment of the investigation fee shall not relieve any persons from fully complying with the requirements of this Chapter, nor from any other penalties A check in the amount of $2,500 was remitted to Weld County for the Application on January 2, 2019 and as directed by Weld County Planning staff, electronic payment of $5,000 occurred for Supplemental 1 on May 1, 2020 for the Weld County Planning Fee required for Use by Special Review —All other Use by Special Review permits. TWP USR SUPPLEMENT 2 SECTION F APPLICATION FEE F-1 WCC Section 23-2-480 and 23-2-490 Section G WCC Approval Standards and Application Requirements This section addresses applicable standards and requirements of WCC Sections 23-2-480, 23-2-490, 23-2-510, 23-2-520, and consistency with WCC Chapter 22. WCC Approval Standards WCC Sections 23-2-480 A.1 and WCC 23-2-490 A All reasonable efforts have been made to avoid irrigated cropland or to minimize the negative impacts on agricultural USES and lands. Supplement 2 demonstrates that the standards described in WCC Sections 23-2-480 A.1 and 23-2-490A are met as presented in Section 4 Questionnaire Planning, Section C.2.a through Section C.2.d, Section C.2.h, Section C.2.i, and Appendix F. Criteria used for developing the water pipeline location included minimizing impacts to agricultural uses. Thornton's land agents have worked with property owners along the water pipeline alignment to explain pipeline construction, operations, and maintenance activities and to determine the best location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to minimize affecting the operation of irrigation equipment. The process to develop the water pipeline route was iterative, and are a result of negotiations with individual property owners or detailed land, utility, or resource surveys that revealed engineering or environmental constraints. The TWP is a low impact, passive use that is compatible with agricultural uses. The TWP is not anticipated to impact standard agricultural practices once the water pipeline is installed. The water pipeline and fiber optic cable will be buried below the plow line to prevent interference with anticipated agricultural land uses. In addition, land use effects on agricultural uses will be temporary during construction and are anticipated to be minimal after construction. The water pipeline alignment is generally located parallel to property lines or adjacent to Weld County future ROW minimizing the effects to agriculture. Agricultural uses such as farming, grazing, or access within the permanent easement can continue after construction so long as such uses do not interfere with or endanger the operation of the TWP. Additional measures that will be implemented to minimize impacts to irrigated agricultural land include: + Stripping and storing topsoil separately from excavated trench materials. • Seeding or leaving land fallow in accordance with the individual property owner's agreed -upon reclamation procedures following construction of the water pipeline. The TWP will cross multiple irrigation ditches along the water pipeline route within unincorporated Weld County as presented in Section 6. Thornton has begun outreach to each irrigation ditch company to begin coordination activities. See Appendix B for additional information on stakeholder outreach. As part of the negotiation process for acquiring easements, Thornton's land agents coordinate with property owners on lateral ditch crossings to limit impacts to agricultural operations. Thornton will obtain appropriate agreements for each crossing before construction. No direct effects on water flow, quantity, quality, or timing in the irrigation ditches are anticipated. Crossings will be constructed using either trenchless or open -cut methods as required by the irrigation ditch company and during times the ditch is not running, if required. TWP USR SUPPLEMENT 2 SECTION G WCC APPROVAL STAN DARDS AND APPLICATION REQUIREMENTS G-1 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Thornton is committed to cooperating and coordinating with the agricultural community in the vicinity of TWP. WCC Sections 23-2-480 A.2 and 23-2-490 B The PIPELINE - DOMESTIC WATER will not have an undue adverse effect on existing and future DEVELOPMENT of the surrounding area, as set forth in applicable MASTER PLANS. Supplement 2 demonstrates that the standards described in WCC Sections 23-2-480 A.2 and 23-2-490 B are met and that Supplement 2 is consistent with WCC Chapter 22 as presented in Section 4 Questionnaire Planning, Engineering, and Environmental Health, Section 16, Section 17, Section 23, Section 24, Section C.2.a through Section C.2.f, Section C.2.h, Section C.2.i, Section C.2.l, Appendix A, and Appendix F. The water pipeline and most appurtenances will be buried with limited above ground equipment. There will be minimal effects to the rural character of Weld County. The water tank and pump stations will be above ground appurtenances and will be constructed on land on which Thornton has acquired fee title interest. Thornton will locate and construct the TWP in a manner consistent with existing and planned land uses in Weld County. Thornton is committed to cooperating and coordinating with the agricultural community and private and governmental land owners in the vicinity of the TWP. WCC Chapter 22 - Comprehensive Plan WCC Section 22-1-100 states "The Comprehensive Plan, contained in this Chapter, is the document intended to fulfill the master plan requirement pursuant to state law (Section 30-28-106(1), C.R.S.) and, in part, to set land use policy pursuant to the Home Rule Charter." Thornton conducted a review of review of the Comprehensive Plan and the TWP will not have an undue adverse effect on existing and future development of the surrounding area, as set forth in the Comprehensive Plan. On November 23, 2020 Chapter 22, Comprehensive Plan (Comprehensive Plan 2020) became effective. The Application and Supplemental Permit Application (Supplement 1) were developed under the WCC, Chapter 22, Comprehensive Plan adopted in 2008 (Comprehensive Plan 2008). Supplement 2 demonstrates that the TWP will not have an undue adverse effect on existing and future development of the surrounding area, as set forth in the Comprehensive Plan 2008 and the Comprehensive Plan 2020. Comprehensive Plan 2008 2008 Guiding Principles The Comprehensive Plan 2008, is intended to be used for the general purpose of guiding and accomplishing the coordinated, adjusted and harmonious development of Weld County. Thornton intends to comply with the guiding principles of the Comprehensive Plan 2008 relevant to the TWP. Private Property Rights Thornton has purchased easements and land through good -faith negotiations with property owners and only used eminent domain when all other reasonable options have been explored. Thornton's land agents have worked with property owners along the TWP alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to limit impacts to the operation of irrigation equipment, structures, trees, and other infrastructure. The process to develop the water pipeline alignment was iterative, and is a result of negotiations with individual property owners, or is a result of detailed land, utility, or resource TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-2 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION surveys that revealed engineering or environmental constraints. The TWP is developed in a manner that is respectful of private property rights. Respect for Agriculture Tradition The TWP is a low impact, passive use that is consistent with the agricultural setting and zone designation. The TWP is not anticipated to impact standard agricultural practices once the water pipeline is installed. The water pipeline and fiber optic cable will be buried below the plow line to prevent interference with anticipated agricultural land uses. In addition, land use effects on agricultural uses will be temporary during construction and are anticipated to be minimal after construction. The water pipeline alignment is generally located parallel to property lines or adjacent to Weld County future ROW minimizing the effects to agriculture. Agricultural uses such as farming, grazing, or access within the permanent easement can continue after construction so long as such uses do not interfere with or endanger the operation of the TWP. The buried pipeline and fiber optic cable are compatible with estate use. The estate zone district allows rural, large -lot residential land uses and land uses that are compatible with very low -density residential areas. The water pipeline alignment is generally located parallel to property lines minimizing the effects to estate zone district land. Estate uses or access within the easement can continue after construction so long as such uses do not interfere with or endanger the operation of the TWP. The site for the water tank is vacant land adjacent to an existing water tank owned by North Weld County Water District. The site is located adjacent to County Road 13 and is part of a larger parcel leased to Anheuser Busch for land application of treated effluent from its Wellington brewery operation. The larger parcel is also actively being considered for purchase by Windsor and other water providers in the area for a regional water treatment plant. Thornton's use of a portion of the larger parcel for its water tank and water pipeline are compatible with use of the larger parcel for a regional water treatment plant, should that plan proceed. Existing use, including agricultural use, in areas surrounding the water tank can continue. The site for Pump Station 1 is vacant land of which approximately 75 percent is leased for irrigated farming and the remaining 25 percent is not used. The site is part of a larger parcel used for irrigated agriculture and oil and gas development. Existing uses, including agricultural use, in areas surrounding the pump station can continue. The site for Pump Station 2 is vacant land adjacent to County Road 17 and County Road 2 and can be used for growing non -irrigated grass hay that is cut for feed. Existing uses, including agricultural use, in areas surrounding the pump station can continue. Fairness in the Land Use Change Procedure and Regulations Addressing Land Use Changes/Regulations Addressing Land Use Changes The TWP will not require any land use or zone changes in unincorporated Weld County. Recognition of Weld County's Diversity The TWP represents a low -intensity land use that will be compatible with existing agricultural land use, low density residential development, open space, and other uses, and is otherwise compatible with Weld County's geographic, demographic, cultural, social and economic diversity. To determine the alternative corridor least impactful to local communities, Thornton, in 2015, conducted a series of outreach meetings with local governments and agencies that could be impacted by the TWP. During the initial outreach meeting with each local government and agency, feedback was collected to determine preference(s) and/or determine potential problems, including TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-3 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION planned developments, for the location of the water pipeline within the local government or agency's jurisdictional and/or GMA boundaries. Thornton recognizes that the energy industry is an essential industry in Weld County. As part of the coordination process for the TWP and to help minimize impacts to the energy industry, Thornton presented the TWP at the Energy Industry Working Group (Weld County oil and gas companies) on December 15, 2016. In addition, outreach letters have been sent to initiate coordination of activities to oil and gas companies. Coordination with oil and gas companies continued during the land acquisition process to lessen impacts to existing and planned infrastructure. Where feasible, the water pipeline easement overlaps nonexclusive oil and gas easements and the water pipeline will be located outside of the overlapping easement to minimize both property owner and oil and gas impacts. Economic Growth The TWP will not have a negative effect on the economic growth of local government or any other existing public facilities and services. The TWP construction contractors will provide crews that are not anticipated to exceed approximately 100 workers at any one time. Some workers may reside outside of the local areas and will require lodging or temporary housing. The number of construction workers on site will depend on the contractor and the construction activity occurring during a particular time. Thornton will endorse hiring local workers. TWP contractors and construction workers will likely support local businesses to meet a need for durable and nondurable goods and services. Goals and Policies The Comprehensive Plan 2008 contains policies to guide land use within unincorporated areas of Weld County. Many of the policies are directed toward industrial development, commercial development, or other areas not directly related to the TWP. For this reason, the discussion presented in Section C.2.i addresses only those land use and other policies relevant to the TWP. The information provided demonstrates that the TWP is consistent with the goals and policies of the Comprehensive Plan 2008. Comprehensive Plan 2020 2020 Guiding Principles Comprehensive Plan 2020, Guiding Principles are the foundation for land use policy in Weld County. Thornton intends to comply with the guiding principles of the Comprehensive Plan 2020 relevant to the TWP. Respecting Our Agricultural Heritage Criteria used for developing the water pipeline location included minimizing impacts to agricultural uses. Thornton's land agents have worked with property owners along the water pipeline alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to minimize affecting the operation of irrigation equipment. The process to develop the water pipeline route was iterative, and is a result of negotiations with individual property owners or detailed land, utility, or resource surveys that revealed engineering or environmental constraints. TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-4 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Thornton's land agents negotiate the purchase of easements where needed based on fair market value. The easements will grant Thornton an area to construct, operate, and maintain the water pipeline, and property owners will maintain fee title to the land. Property owners can continue to use the land within the easement area for purposes such as farming, grazing, or access, so long as such uses do not interfere with or endanger the operation of the TWP. The predominant land use in the TWP area, agricultural use, is compatible with operation of the TWP because the water pipeline and fiber optic cable will be buried below the plow line. Additional measures that will be implemented to minimize impacts to irrigated agricultural land include: • Stripping and storing topsoil separately from excavated trench materials • Seeding or leaving land fallow in accordance with the individual property owner's agreed -upon reclamation procedures following construction of the water pipeline The TWP will cross multiple irrigation ditches along the water pipeline route within unincorporated Weld County as presented in Section 6. Thornton has begun outreach to each irrigation ditch company to begin coordination activities. See Appendix B for additional information on stakeholder outreach. As part of the negotiation process for acquiring easements, Thornton's land agents coordinate with property owners on lateral ditch crossings to limit impacts to agricultural operations. Thornton will obtain appropriate agreements for each crossing before construction. No direct effects on water flow, quantity, quality, or timing in the irrigation ditches are anticipated. Crossings will be constructed using either trenchless or open -cut methods as required by the irrigation ditch company and during times the ditch is not running, if required. Existing use, including agricultural use, in areas surrounding the water tank can continue. The site for Pump Station 1 is located on vacant land of which approximately 75 percent is leased for irrigated farming and the remaining 25 percent is not used. The site is part of a larger parcel used for irrigated agriculture and oil and gas development. Existing use, including agricultural use, in areas surrounding the pump station can continue. The site for Pump Station 2 is vacant land adjacent to County Road 17 and County Road 2 and is currently not being used, but in the past has been used for growing non -irrigated grass hay that was is cut for feed. Existing use, including agricultural use, in areas surrounding the pump station can continue. Respecting Private Property Rights Thornton has purchased easements and land through good -faith negotiations with property owners, and only uses eminent domain when all other reasonable options have been explored. Thornton's land agents have worked with property owners along the TWP alignment to explain pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to limit impacts to the operation of irrigation equipment, structures, trees, and other infrastructure. The process to develop the water pipeline route was iterative, and is a result of negotiations with individual property owners, or is a result of detailed land, utility, or resource surveys that revealed engineering or environmental constraints. The TWP is developed in a manner that is respectful of private property rights. Promoting Economic Growth and Stability The TWP will not have a negative effect on the economic growth of local government or any other existing public facilities and services. The construction, operation, and maintenance of the TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-5 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION underground water pipeline and appurtenances will not require any new public facilities or impact existing services such as police, fire, water, waste water, and healthcare. Thornton has purchased easements and land through good -faith negotiations with property owners and only uses eminent domain when all other reasonable options have been explored. To determine the water pipeline route least impactful to local communities, Thornton, in 2015, conducted a series of outreach meetings with local governments and agencies that could be impacted by the TWP. During the outreach meetings with each local government and agency, feedback was collected to determine preference(s) and/or determine potential problems, including planned developments, for the location of the water pipeline within the local government or agency's jurisdictional and/or GMA boundaries. The TWP construction contractors will provide crews that are not anticipated to exceed approximately 100 workers at any one time. Some workers may reside outside of the local areas and will require lodging or temporary housing. The number of construction workers on site will depend on the contractors and the construction activity occurring during a particular time. Thornton will endorse hiring local workers. TWP contractors and construction workers will likely support local businesses to meet a need for durable and nondurable goods and services. Protecting Health, Safety, and General Welfare Environmental Hazards Thornton and the TWP contractors will provide and maintain sanitary accommodations for the use of their employees during construction of the TWP in a manner that complies with the requirements and regulations of health departments and other governmental bodies. These accommodations, including trash dumpsters and portable toilets, will be located in several locations along the TWP alignment based on the general plan for construction. TWP contractors will be responsible for supplying and maintaining portable toilets. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws and regulations and that they screen portable toilets from the general public. Construction waste will be stockpiled in construction staging areas and removed from the construction site during the construction process. Trash dumpsters will be emptied approximately every 1 to 2 weeks. The TWP will not include the need for permanent dumpsters or sanitary facilities for domestic purposes as the water tank, pump stations, and underground water pipeline will be unmanned. Construction activities will follow best management practices for the management of wastes to avoid and minimize impacts from potential spills or other releases to the environment. These practices discussed in greater detail below will protect the health, safety and welfare of the inhabitants of Weld County. Hazardous Materials and Waste Management Mitigation Measures Construction, operation, and maintenance activities involving Thornton or the TWP contractors bringing any hazardous materials onto the site will comply with applicable federal, state, and local laws and regulations regarding the handling, storage, disposal, transportation, and use of hazardous substances. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws. If trenching activities uncover previously unknown areas of contamination that are apparent, work will be stopped until the party responsible for such contamination has properly managed and/or disposed of such contamination. TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-6 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Construction staging areas will be located and arranged in a manner to preserve trees and vegetation to the extent feasible. Excavated material or other construction materials will not be stockpiled or deposited near or on stream banks or other watercourse perimeters where they could be washed away by high water or storm runoff, or could encroach upon stream banks. Best management practices (BMPs) will be implemented for stormwater management. A summary of BMPs to protect water resources from potential contamination is provided in Appendix C. These practices will protect the health, safety and welfare of the inhabitants of Weld County. Fueling Mitigation and Safety Measures TWP Construction If possible, fueling requirements will be met before arrival at the construction site. Heavy equipment left on site for construction activities will require onsite fueling at staging areas or the construction site. No bulk fuel storage is anticipated to occur on site. Fueling vehicles will be equipped with spill kits and fire extinguishers, and personnel will be properly trained in spill prevention, control, and countermeasures. To minimize the potential for a spill during fuel transfers and be prepared in the event of a spill, the following measures, as provided in the Code of Colorado Regulations [CCR] and Code of Federal Regulations [CFR], will be followed during loading/unloading of fuel: + Keep fire away while loading/unloading. Persons in the vicinity are forbidden to smoke, light matches, or carry any flame or lighted cigar, pipe, or cigarette. 49CFR 177.834(c, d). + Fuel will not be loaded/unloaded from any motor vehicle while the engine is running. The exception is when the engine of the vehicle is to be used in the operation of the pump. 49CFR 177.837(a). + The fuel tank records will be reviewed to determine the theoretical fuel tank level. 7CCR 1101- 14 S2-3-1 and S2 -4-2(a)(2.) • The fuel tank level gauge will be inspected to determine the actual fuel tank level before unloading takes place. (Note: Any fuel tank level discrepancies will be resolved before hooking up to the fuel tank.) 7CCR 1101-14 S2-3-1 & S2 -4-2(a)(2). • The supply truck driver will observe the transfer during the entire operation. 49CFR 177.834(i)(2). • Once the truck is in position, its emergency brake will be applied and reasonable precautions will be taken to prevent motion of the truck during unloading (example: utilize wheel chocks when parked on an incline). 49CFR 177.834(e). • Signs must be posted that remind drivers not to pull away before detaching hoses. 40CFR 112.7(h)(3). + Containers and cargo tanks will be grounded before and during transfer. 49CFR 177.837(b) & (c). • The transfer line must be properly disengaged, and the valves and piping of both the fuel tank and truck must be checked for leaks before allowing the truck to leave the site. (40CFR 112.7 h(4) for trucks). TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-7 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TWP Post -construction If feasible, backup power for the pump stations will be provided by a second feed from the applicable utility provider. Should a second feed not be available, or require significant improvements to the utility grid, backup diesel generators will be installed at both pump stations. The amount of fuel stored will be that required for 36 hours of operation at full load. At Pump Station 1, three 2 -megawatt (MW) diesel generators with approximately 4,150 -gallon underbelly tanks will be installed, if required. In this arrangement, approximately 12,500 gallons of diesel fuel will be stored onsite. At Pump Station 2, three 2 -MW diesel generators with approximately 4,150 -gallon underbelly tanks will be installed, if required. In this arrangement, approximately 12,500 gallons of diesel fuel will be stored onsite. The following measures will be followed for installation and operation of diesel fuel storage installed as part of any emergency generators included with the pump stations: • Location of fuel tanks will comply with required separation distances. 7CCR 1101-14 S3-2-2-4 + Application for Permit for Above Ground Storage Tank (AST) will be submitted and obtained for installation of diesel fuel storage tanks. 7CCR S3-2-3 • Spill and overfill protection will be provided during operation, including secondary containment equal to or greater than the volume of diesel fuel being stored. 7CCR 1101-14 S3-3-1 • Release detection will be provided. 7CCR 1101-14 S3-3-3 + Testing and compliance inspections will be completed per applicable code(s). 7CCR 53-3-4. These practices will protect the health, safety and welfare of the inhabitants of Weld County. Traffic and Roads and Mitigation Measures Impacts caused by construction equipment and activity on Weld County roads will be short term during construction. Access will be maintained for local area residents. Emergency vehicle access needs will be maintained and construction activities coordinated with local fire departments, police departments, ambulance services, and other emergency responders as necessary. Thornton places a high priority on safety during construction. Thornton will coordinate with local school districts regarding construction and haul routes and school bus traffic. TWP contractors will implement traffic management plans based upon local traffic control requirements and general safe operating practices. Proper signage, flaggers, lighting, speed limits, work hours, postings, notifications, and other precautionary safety measures will be taken to protect the residents of Weld County and the TWP contractors' employees. The water pipeline construction will utilize trenchless construction methods under Weld County roads where required by Weld County, resulting in little to no disruption to traffic at those locations. Temporary traffic delays and detours will be needed where the water pipeline is installed by open - cut construction across existing roads. Traffic disruption will be temporary, and will cease after construction. Traffic control plans will be implemented before construction, subject to approval and acquisition of permits from Weld County Engineering. If open -cut construction is approved by Weld County at road crossings, Table G.1 presents the number of anticipated days to construct the water pipeline and restore ROW for various road functional classifications. TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-8 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE G.1 Anticipated Water Pipeline Construction and Restoration Times for Open -cut Method for Road Crossings Road Classification ROW Road Surface Anticipated Anticipated Anticipated Length Closure Number of Days Number of Days for Water Pipeline for ROW Installation Restoration Local Local Collector Collector Arterial 60 Gravel Full 60 Paved Full 80 Gravel Partial 80 Paved Partial 140 Paved Partial 2 2 2 2 3 2 2 2 3 3 Additional information and mitigation measures are presented in Section 17, Traffic Narrative. These practices will protect the health, safety and welfare of the inhabitants of Weld County. Operations One of the greatest risks to buried pipelines is excavation by individuals unaware of the location of a pipeline. Pipeline markers will be installed in the pipeline permanent easement to indicate that a water pipeline is buried nearby. The markers will identify the water pipeline, Thornton as the pipeline operator, the operator's 24 -hour emergency contact number, and the area's utility notification number. Marking tape indicating that a water pipeline is buried in the location will also be installed above the water pipeline for the entire length of the water pipeline. The majority of the water pipeline in unincorporated Weld County will be located within permanent easements. This approach reduces the probability that individuals could damage the water pipeline with ground - disturbing activities. The water pipeline will be designed and constructed to be water tight. Pipe materials will be required to undergo shop testing before installation as well as hydrostatic field testing after installation. The water pipeline and appurtenances will be coated and lined to prevent corrosion. As an additional safety measure, project components will be installed with cathodic protection, which will control the corrosion of a metal surface. Cathodic protection systems are commonly used to protect metallic water pipelines. These practices will protect the health, safety and welfare of the inhabitants of Weld County. 2020 Goals and Objectives The Comprehensive Plan 2020 contains goals that are desired ambitions and results to be pursued by Weld County within unincorporated areas of Weld County. The objectives help clarify the goal's intent. The information provided in Section C.2.i of the Summary Statement demonstrates that the TWP is consistent with the goals and objectives of the Comprehensive Plan 2020. Weld County 2045 Transportation Plan The TWP was reviewed in conjunction with the area goals and transportation improvement plans outlined in the Weld County 2045 Transportation Plan, (Weld County, 2020). The Weld County 2045 TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-9 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Transportation Plan identifies multiple short range, mid -range, and long-range improvement needs within the TWP area. If these improvement projects occur within the timeframe of the construction of the TWP ("overlap"), Thornton will work with Weld County and other involved parties to coordinate construction and minimize disruption. The TWP is not located within Weld County ROW or future planned ROW except where it must cross ROW. Thornton understands that, if the TWP crosses Weld County ROW, then use of that ROW will require Weld County approval. The TWP transitions from one side of the road to the other at multiple locations to minimize impacts to property owners, existing structures, including buildings, irrigation ditches, oil and gas facilities, other utilities, and other infrastructure. Other Applicable Master Plans Approximately 11 miles of the TWP in Weld County include the incorporated limits of Dacono, Firestone, Frederick, Johnstown, Platteville, Severance, Timnath, and Windsor, including roads that have been annexed by local governments. Thornton reviewed GMA boundaries and transportation master plans for Berthoud, Dacono Firestone, Frederick, Fort Lupton, Johnstown, Mead, Milliken, Platteville, Severance, Timnath, and Windsor, to determine the extent of future ROW within GMA boundaries. Thornton will coordinate the location of the water pipeline with these municipalities as appropriate where the water pipeline is located within the municipality's boundary. WCC Sections 23-2-480 A.3 and 23-2-490 C The design of the proposed PIPELINE - DOMESTIC WATER mitigates negative impacts on the surrounding area to the greatest extent feasible. Supplement 2 demonstrates that the standards described in WCC Sections 23-2-480 A.3 and 23-2-490 Care met as presented in Section 4 Questionnaire Planning, Engineering and Environmental Health, Section 11, Section 12, Section C.2.a through Section C.2.i, and Appendix A, Appendix F, and Appendix G. Where practicable, the criteria for developing the preferred route in unincorporated Weld County was implemented to minimize impacts to Weld County and included: + Be outside current and future planned road ROW. • Be adjacent to roads, current or future road ROW, existing utility easements, and property lines. + Minimize impacts to agricultural use. • Consider property owner preference. • Minimize impacts to existing structures. + Cross waters, irrigation ditches, roads, and railroads perpendicular to the feature. • Minimize road crossings. + Minimize impacts to environmental and cultural resources. + Minimize impacts to open lands/conservation easements. • Provide a sound engineering solution. Thornton reviewed aerial photography and performed site reconnaissance of the preferred corridor to develop a draft route based on the criteria listed above. Title records were reviewed and rights of entry were requested for properties crossed by the draft route to determine existing encumbrances on these properties. Next, Thornton began discussions with property owners and conducted environmental surveys and planimetric survey of property boundaries, existing infrastructure, and utilities on the properties for TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-10 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION which written right of entry was granted to Thornton by the property owner. As part of the surveys, existing easement locations and easement restrictions were identified. Thornton approached easement holders without exclusive rights to discuss opportunities for shared and/or overlapping easements. During discussions with property owners, Thornton reviewed possible water pipeline locations to minimize impacts. Based on information obtained from surveys, easement holders, and property owner discussions, the draft route was revised and refined to reflect the water pipeline alignment for the TWP as presented in this Supplement 2. Mitigation measures for resources are presented throughout this Supplement 2 as indicated in Table G.2: TABLE G.2 Impacted Existing Condition Reference to Mitigation Measures Location in Supplement 2 Impacted Existing Condition Impact Supplement 2 Section Reference Private Property Mitigable 100 -Year Floodplains Air Quality Cultural Drainage and Erosion Geological Hazards Groundwater Jurisdictional Waters Noise Public Health and Safety Special Status Species Transportation Vegetation Wildlife Mitigable Mitigable No Significant Impact Section C.2.a, Land Acquisition; Section C.2.b, Preferred Route Development; C.2.c Private Property; C.2.d, Construction Activities Section C.2.c, Floodplain Information Section C.2.c, Air Quality Information Appendix A, Natural and Cultural Resources Assessment Mitigable Section C.2.c; Section 16, Drainage; Section 24, Soils Reports; Appendix C, Best Management Practices Mitigable Section 24, Soils Reports; Appendix D, Soils Reports Mitigable Section C.2.c, Groundwater Information Appendix A, Natural and Cultural Resources Assessment No Significant Impact Mitigable Mitigable Mitigable Mitigable Mitigable Mitigable Section 23, Noise Study Section C.2.f Appendix A, Natural and Cultural Resources Assessment Section 17, Traffic Narrative Appendix A, Natural and Cultural Resources Assessment Appendix A, Natural and Cultural Resources Assessment Thornton's land agents negotiated the purchase of easements where needed based on fair market value. As part of the process to negotiate the purchase of easements, Thornton's land agents have worked with property owners along the TWP route to explain water pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to minimize impacts to the operation of irrigation equipment, structures, trees, and other infrastructure TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-11 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION The area disturbed for constructing the water pipeline will be restored to pre -construction conditions, including grade and vegetation, thus minimizing long-term impacts. Potential future repairs and maintenance could affect discrete areas of vegetation when the water pipeline is accessed in a particular location. Any vegetated areas disturbed during maintenance or required repairs will be restored by the methods used during construction. Property owners will be compensated for compensable damages, as well as receive fair market value for easements. Construction work hours will typically be from 7 a.m. to 7 p.m. Monday through Saturday unless otherwise approved by Weld County. Construction may extend beyond these hours on an as - required and case -by -case approved basis. For example, some construction activities, such as hydrostatic testing, require 24/7 operation, and shift work may be required. After construction, the water pipeline and appurtenances could operate year-round, 24 hours a day; however, the water pipeline and appurtenances will be unmanned. It is anticipated that normal operations could include up to two TWP operators traveling in one pickup truck daily along the water pipeline route for a visual inspection and maintenance activities during the hours of S a.m. to 5 p.m. TWP operators are also anticipated to conduct up to one visit per day of the water tank and pump station locations to inspect security and operation of each facility. Typically, operation of the pump stations, including video monitoring of site security, will be conducted remotely from another Thornton -owned facility. Up to twice per year, it is anticipated that TWP operators will enter vault and manhole appurtenances to exercise valves and conduct routine maintenance of equipment. To the extent practicable, visual inspections will be from public roads to minimize impacts to property owners. In case of emergency, the operators may be on -site outside of the normal operating hours. Consequently, there will be limited effects on the volume of traffic on local streets. WCC Sections 23-2-480 A.4 and 23-2-490 D The site shall be maintained in such a manner so as to control soil erosion, dust and the growth of NOXIOUS WEEDS. Supplement 2 demonstrates that the standards described in WCC Sections 23-2-480 A.4 and 23-2-490 D are met as presented in Section 4 Questionnaire Environmental Health, Section 16, Section 24, Section C.2.c, Section C.2.d, Section C.2.i, and Appendix A. Revegetation Areas disturbed for construction of the water pipeline will be restored to pre -construction grades and revegetated to pre -construction vegetation where appropriate after construction. Areas disturbed for water tank and pump station sites that are not designated for infrastructure, such as tank/forebay, buildings, parking and access areas, and equipment will be revegetated where appropriate after construction. Restored vegetation will be comparable to existing vegetation. Certified weed -free seed mix consisting of drought -tolerant native grasses and other types of vegetation as appropriate to meet property owner preferences or regulatory requirements will be specified in the SWMP for the revegetation of disturbed areas. Disturbed mature vegetation will be replaced, per a property owner's reasonable request, with a like species. Soil Erosion Surface drainage stormwater BMPs will include application of erosion control techniques and the successful revegetation of disturbed areas. The required Weld County grading permit and CDPHE construction stormwater permits and SWMPs will include detailed descriptions of BMPs that will be used to protect surface hydrology and water quality. BMPs will be implemented per the SWMP to minimize or mitigate soil erosion and revegetate disturbed areas. The soil erodibility figure shows the NRCS K factor values. K factor values represent TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-12 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION the susceptibility of soil erosion, transportability of the sediment, and the amount and rate of runoff given a particular rainfall event. Approximately 59% of the TWP is located within the low -to -medium soil erodibility range. A low -to -medium soil erodibility factor indicates that slight to moderate erosion is likely and that erosion -control measures may be needed. Approximately 38% of the TWP is located within the high soil erodibility range. High soil erodibility indicates that erosion is very likely and that erosion -control measures are advised, including revegetation of bare areas. Approximately 3% of the TWP is located in areas with no assigned value. BMPs will be maintained and inspected. Failed BMPs will be replaced as required. After work is complete and final stabilization has been achieved, temporary BMPs will be removed. Final stabilization will be reached as defined in the Weld County Grading Permit and the CDPHE Stormwater Discharge Associated with Construction Activity - General Permit. In areas with sandy soils and increased sloughing, mitigation measures in those area may include, but are not limited to, the following: • Stream and bank stabilization methods such as riprap protection or concrete mats • Imported backfill material such as low -strength concrete • Revegetation • Soil erosion blankets during construction • Trenchless construction methods Mitigation measures will be implemented in areas outside of any jurisdictional waters. A subsurface geotechnical investigation of geologic conditions utilizing soil and rock borings will be completed during design to further determine the subsurface soil conditions and associated geological hazards along the TWP route. Mitigation measures will be further refined during design to meet site -specific geological hazards. Dust The amount of surface clearing required for construction will exceed 25 acres; therefore, Thornton and/or the TWP contractors will develop a fugitive dust control plan, submit an air pollution emissions notice, and obtain a permit from CDPHE before construction activities in accordance with state air quality regulations. The TWP will be constructed under multiple packages and multiple permits will be obtained as required. Construction activities, such as vehicles driven over cleared ground, general disturbance to vegetated areas, or soil stockpiles susceptible to winds, can cause fugitive dust. During construction, dust control measures will be implemented. Examples of these mitigation measures that maybe used on the TWP include: • Speed limits for construction vehicles within the work area • Water application to disturbed areas, dirt access roads, and stockpiles • Erosion control techniques and best management practices • Revegetation of disturbed areas following construction activities Noxious Weeds Noxious weeds within the TWP construction limits, including within Weld County ROW, will be controlled using the following IPM methods as described by the CDOA. The following methods have TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-13 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION been developed to control noxious weeds in a manner that prevents harm to human health and to environmentally sensitive areas such as waterways and desirable vegetation including native trees. • Major equipment (e.g. truck equipment and backhoes) will be cleaned by high pressure air or water spray before being delivered to the project area to avoid introducing undesirable plants and noxious weeds. • If practicable, topsoil should not be salvaged in any area densely infested with noxious weeds. + For areas where removal is not practicable or only a small area of noxious weeds is present, pre- treat all noxious weed populations in the topsoil. + Fertilizer or other soil amendments will not be used unless recommended by a revegetation specialist based on site -specific conditions. The use of fertilizers will be restricted because they can promote noxious weeds and can be detrimental to native species in the revegetation mix. + After construction is complete, all disturbed areas will be properly revegetated as quickly as possible. Prompt revegetation with appropriate species is essential for preventing the spread of noxious weeds. + Certified weed -free seed and mulch will be used for revegetation. Weed -free straw bales will be used for sediment barriers. • If stands of noxious weeds become established, weed control would be implemented following an integrated approach specific to the weed species present. • Because new control methods are continually being developed, particularly for herbicide applications, any control methods used will follow the CDOA and Weld County recommendations at the time of implementation. WCC Sections 23-2-480 A.5 and 23-2-490 E The applicant has agreed to implement any reasonable measures deemed necessary by the Board of County Commissioners to ensure that the health, safety and welfare of the inhabitants of the COUNTY will be protected, and to mitigate or minimize any potential adverse impacts from the proposed PIPELINE - DOMESTIC WATER. Supplement 2 demonstrates that the standards described in WCC Sections 23-2-480 A.5 and 23-2- 490 E are met as presented in Section 4 Questionnaire Planning, Engineering, and Environmental Health, Section 16, Section 17, Section 22, Section 23, Section 24, Section C.2.a through Section C.2.i, Section C.2.l, Appendix A, Appendix C, Appendix F, and Appendix G. Reasonable measures to ensure that the health, safety, and welfare of the inhabitants of Weld County will be protected, and to mitigate or minimize potential adverse impacts from the TWP are included in Supplement 2. Environmental Hazards Thornton and the TWP contractors will provide and maintain sanitary accommodations for the use of their employees during construction of the TWP in a manner that complies with the requirements and regulations of health departments and other governmental bodies. These accommodations, including trash dumpsters, will be located in several locations along the TWP alignment based on the general plan for construction In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws and regulations. Construction waste will be stockpiled in construction staging areas and removed from the construction site during the construction process. Trash dumpsters will be emptied approximately every 1 to 2 weeks. The TWP will not TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-14 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION include the need for permanent dumpsters as the water tank, pump stations, and underground water pipeline will be unmanned. Construction activities will follow best management practices for the management of wastes to avoid and minimize impacts from potential spills or other releases to the environment. These practices discussed in greater detail below will protect the health, safety and welfare of the inhabitants of the neighborhood. Hazardous Materials and Waste Management Mitigation Measures Construction, operation, and maintenance activities involving Thornton or the TWP contractors bringing any hazardous materials onto the site will comply with applicable federal, state, and local laws and regulations regarding the handling, storage, disposal, transportation, and use of hazardous substances. In its contract with the TWP contractors, Thornton will require that the TWP contractors comply with applicable laws. Construction staging areas will be located and arranged in a manner to preserve trees and vegetation to the extent feasible. Excavated material or other construction materials will not be stockpiled or deposited near or on stream banks or other watercourse perimeters where they could be washed away by high water or storm runoff, or could encroach upon stream banks. Best management practices will be implemented for stormwater management. A summary of BMPs to protect water resources from potential contamination is provided in Appendix C. These practices will protect the health, safety and welfare of the inhabitants of the neighborhood. Fueling Mitigation and Safety Measures TWP Construction If possible, fueling requirements will be met before arrival at the construction site. Heavy equipment left on site for construction activities will require onsite fueling at staging areas or the construction site. No bulk fuel storage is anticipated to occur on site. Fueling vehicles will be equipped with spill kits and fire extinguishers, and personnel will be properly trained in spill prevention, control, and countermeasures. To minimize the potential for a spill during fuel transfers and be prepared in the event of a spill, the following measures, as provided in the Code of Colorado Regulations [CCR] and Code of Federal Regulations [CFR], will be followed during loading/unloading of fuel: + Keep fire away while loading/unloading. Persons in the vicinity are forbidden to smoke, light matches, or carry any flame or lighted cigar, pipe, or cigarette. 49CFR 177.834(c, d). + Fuel will not be loaded/unloaded from any motor vehicle while the engine is running. The exception is when the engine of the vehicle is to be used in the operation of the pump. 49CFR 177.837(a). + The fuel tank records will be reviewed to determine the theoretical fuel tank level. 7CCR 1101- 14 S2-3-1 and S2 -4-2(a)(2.) + The fuel tank level gauge will be inspected to determine the actual fuel tank level before unloading takes place. (Note: Any fuel tank level discrepancies will be resolved before hooking up to the fuel tank.) 7CCR 1101-14 S2-3-1 & S2 -4-2(a)(2). + The supply truck driver will observe the transfer during the entire operation. 49CFR 177.834(i)(2). TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-15 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • Once the truck is in position, its emergency brake will be applied and reasonable precautions will be taken to prevent motion of the truck during unloading (example: utilize wheel chocks when parked on an incline). 49CFR 177.834(e). • Signs must be posted that remind drivers not to pull away before detaching hoses. 40CFR 112.7(h)(3). + Containers and cargo tanks will be grounded before and during transfer. 49CFR 177.837(b) & (c). • The transfer line must be properly disengaged, and the valves and piping of both the fuel tank and truck must be checked for leaks before allowing the truck to leave the site. (40CFR 112.7 h(4) for trucks). TWP Post -construction If feasible, backup power for the pump stations will be provided by a second electrical power feed from the applicable utility provider. Should a second electrical power feed not be available, or require significant improvements to the utility grid, backup diesel generators will be installed at both pump stations. The amount of fuel stored will be that required for 36 hours of operation at full load. At Pump Station 1, three 2 -megawatt (MW) diesel generators with approximately 4,150 -gallon underbelly tanks will be installed, if required. In this arrangement, approximately 12,500 gallons of diesel fuel will be stored onsite. At Pump Station 2, three 2 -megawatt (MW) diesel generators with approximately 4,150 -gallon underbelly tanks will be installed, if required. In this arrangement, approximately 12,500 gallons of diesel fuel will be stored onsite. The following measures will be followed for installation and operation of diesel fuel storage installed as part of any emergency generators included with the pump stations: • Location of fuel tanks will comply with required separation distances. 7CCR 1101-14 S3-2-2-4 + Application for Permit for Above Ground Storage Tank (AST) will be submitted and obtained for installation of diesel fuel storage tanks. 7CCR S3-2-3 + Spill and overfill protection will be provided during operation, including secondary containment equal to or greater than the volume of diesel fuel being stored. 7CCR 1101-14 S3-3-1 • Release detection will be provided. 7CCR 1101-14 S3-3-3 + Testing and compliance inspections will be completed per applicable code(s). 7CCR S3-3-4. These practices will protect the health, safety and welfare of the inhabitants of the neighborhood. Traffic and Roads and Mitigation Measures Impacts caused by construction equipment and activity on Weld County roads will be short term during construction. Access will be maintained for local area residents. Emergency vehicle access needs will be maintained and construction activities coordinated with local fire departments, police departments, ambulance services, and other emergency responders as necessary. Thornton places a high priority on safety during construction. Thornton will coordinate with local school districts regarding construction and haul routes and school bus traffic. TWP contractors will implement traffic management plans based upon local traffic control requirements and general safe operating practices. Proper signage, flaggers, lighting, speed limits, work hours, postings, notifications, and other precautionary safety measures will be taken to protect the residents of Weld County and the TWP contractors' employees. TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-16 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION The water pipeline construction will utilize trenchless construction methods under Weld County roads where required by Weld County, resulting in little to no disruption to traffic at those locations. Temporary traffic delays and detours will be needed where the water pipeline is installed by open - cut construction across existing roads. Traffic disruption will be temporary, and will cease after construction. Open -cut construction across existing roads are anticipated to take up to 3 days for water pipelined installation and up to 3 days for ROW restoration. Traffic control plans will be implemented before construction, subject to approval and acquisition of permits from Weld County Engineering. Additional information and mitigation measures are presented in Section 17. Hazard Areas Flood Hazard Areas The TWP crosses five designated 100 -year floodplains in unincorporated Weld County The TWP will not alter floodplains. Floodplain crossings will utilize open -cut construction in the fringe area of the floodplain and trenchless construction methods under the ordinary high water mark and associated wetlands so that there will be no impact to jurisdictional waters. Spoils from trench excavations, construction -related equipment, materials, and supplies will be stored outside of the 100 -year floodplain per local floodplain regulations. Fringe areas using open -cut construction will be restored to pre -construction grades and vegetation after construction. Therefore, the TWP will mitigate impacts on the hydraulics and hydrology of the floodplain. Thornton will obtain a Floodplain Development Permit for floodplain crossings as required. Geologic Hazard Overlay District Based on the desktop review, the majority of the TWP has no identified geologic hazards and the hazards identified are not considered "active". Weld County's GIS Data shows two inactive faults along the water pipeline alignment. Based upon mapping conducted by the Colorado Geological Survey (Colorado Earthquake Hazards Mitigation Council, 2013), the mapped faults identified in Weld County's GIS Data are not identified as quaternary faults (i.e. faults which have been active in the past 1.8 million years) and as such are generally not considered "active". Due to the inactivity of the faults and the lack of recorded earthquakes in the area, the risk of shallow earthquakes and ground movements is considered low. Construction risks therefore are limited to poor rock conditions (i.e. fault breccia and gouge), spatially rapid changes in ground conditions across fault zones, and the potential for perched water conditions. Potential mitigation measures in this area include: • Limiting the vertical alignment of the water pipeline to the surficial soils, where sufficient cover exists. + Open -cut construction methods. • Additional dewatering capacity in the case of rapid increases of water inflows. Weld County's GIS Data does not show abandoned coal mines along the water pipeline alignment. The Colorado Landslide Inventory Map Viewer, (Colorado Geological Survey) was evaluated to view records regarding landslides in Colorado. The viewer does not indicate records of landslides nor unstable slope areas along the water pipeline alignment A subsurface geotechnical investigation of geologic conditions utilizing soil and rock borings will be completed during design to further determine the subsurface soil conditions and associated TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-17 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION geological hazards along the TWP route. Mitigation measures will be further refined during design to meet site -specific geological hazards. Airport Overlay Zone The TWP is not within the Airport Overlay District. Operations One of the greatest risks to buried pipelines is excavation by individuals unaware of the location of a pipeline. Pipeline markers will be installed in the pipeline permanent easement to indicate that a water pipeline is buried nearby. The markers will identify the water pipeline, Thornton as the pipeline operator, the operator's 24 -hour emergency contact number, and the area's utility notification number. Marking tape indicating that a water pipeline is buried in the location will also be installed above the water pipeline for the entire length of the water pipeline. The majority of the water pipeline in unincorporated Weld County will be located within permanent easements. This approach reduces the probability that individuals could damage the water pipeline with ground - disturbing activities. Thornton understands that a condition of approval of the TWP will include the requirement of submission of a final Weld County approved emergency incident action plan. Further, that Weld County approval of a Final Thornton Water Project Emergency Incident Action Plan will be required before operation of the TWP. The TWP contractors will develop a safety plan that will include an emergency response plan for the construction phase of the TWP. The plan will be written to include identification of emergency response agencies near the TWP area, including how and when to communicate with emergency responders as applicable. The water pipeline will be designed and constructed to be water tight. Pipe materials will be required to undergo shop testing before installation as well as hydrostatic field testing after installation. The water pipeline and appurtenances will be coated and lined to prevent corrosion. As an additional safety measure, project components will be installed with cathodic protection, which will control the corrosion of a metal surface. Cathodic protection systems are commonly used to protect metallic water pipelines. These practices will protect the health, safety and welfare of the inhabitants of the neighborhood. Other Mitigation Measures Mitigation measures for resources are presented throughout Supplement 2 as indicated in Table G.3: TABLE G.3 Impacted Existing Condition Reference to Mitigation Measures Location in Supplement 2 Impacted Existing Condition Impact Supplement 2 Section Reference Private Property Mitigable 100 -Year Floodplains Air Quality Section C.2.a, Land Acquisition; Section C.2.b, Preferred Route Development; C.2.c Private Property; C.2.d, Construction Activities Mitigable Section C.2.c, Floodplain Information Mitigable Section C.2.c, Air Quality Information TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-18 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE G.3 Impacted Existing Condition Reference to Mitigation Measures Location in Supplement 2 Impacted Existing Condition Impact Supplement 2 Section Reference Cultural No Significant Impact Drainage and Erosion Mitigable Geological Hazards Mitigable Groundwater Mitigable Jurisdictional Waters No Significant Impact Noise Mitigable Public Health and Safety Mitigable Special Status Species Mitigable Transportation Mitigable Vegetation Mitigable Wildlife Mitigable Appendix A, Natural and Cultural Resources Assessment Section C.2.c; Section 16, Drainage; Section 24, Soils Reports; Appendix C, Best Management Practices Section 24, Soils Reports; Appendix D, Soils Reports Section C.2.c, Groundwater Information Appendix A, Natural and Cultural Resources Assessment Section 23, Noise Study Section C.2.f Appendix A, Natural and Cultural Resources Assessment Section 17, Traffic Narrative Appendix A, Natural and Cultural Resources Assessment Appendix A, Natural and Cultural Resources Assessment Private Property Thornton's land agent negotiated the purchase of easements where needed based on fair market value. As part of the process to negotiate the purchase of easements, Thornton's land agents have worked with property owners along the TWP route to explain water pipeline construction, operations, and maintenance activities and to determine the location for the water pipeline that best meets property owners' reasonable preferences, including routing the water pipeline to minimize impacts to the operation of irrigation equipment, structures, trees, and other infrastructure The area disturbed for constructing the water pipeline will be restored to pre -construction conditions, including grade and vegetation, thus minimizing long-term impacts. Potential future repairs and maintenance could affect discrete areas of vegetation when the water pipeline is accessed in a particular location. Any vegetated areas disturbed during maintenance or required repairs will be restored by the methods used during construction. Property owners will be compensated for compensable damages, as well as receive fair market value for easements. WCC Sections 23-2-480 A.6 and 23-2-490 F All reasonable alternatives to the proposal have been adequately assessed, and the proposed action is consistent with the best interests of the people of the COUNTY and represents a balanced use of resources in the affected area. Supplement 2 demonstrates that the standards described in WCC Sections 23-2-480 A.6 and 23-2-490 F are met as presented in Section 4 Questionnaire Planning, Section C.2.a, Section C.2.b, Section C.2.c, Section C.2.e, Section C.2.h, Section C.2.i, Appendix F, and Appendix G. TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-19 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Water Pipeline Alignment Selection A series of evaluations were conducted to develop the preferred route for the water pipeline alignment for the TWP in Weld County to meet the project purpose and need. See Purpose and Need section. A multi -step process was used with considerable thought to minimize impacts to local communities and future development. Afour-tiered evaluation program was implemented: First, alternative project corridors within a broader evaluation area were evaluated with input from potentially impacted communities to determine a preferred corridor. Second, with input from potentially impacted property owners within the preferred corridor, route configurations were evaluated within the preferred corridor from step two. Third, an alternative feasibility analysis of locating the water pipeline within Weld County ROW was conducted. Fourth, based on the analysis results of step 3, Thornton concluded it was not feasible to locate the water pipeline in Weld County ROW. Evaluations are summarized below: + Preferred Corridor Evaluation - Evaluation of four corridor alternatives within a broader evaluation area to determine a preferred corridor. • Preferred Route Development— Evaluation of possible locations for the water pipeline within the preferred corridor for suitability to determine a preferred route. + ROW Feasibility Analysis - Evaluation of non -economic factors to consider in locating the TWP water pipeline within ROW as well as a comparative cost analysis on a per linear foot of pipeline installed. + Final Water Pipeline Easement Development - Thornton worked with impacted property owners to determine the location for the water pipeline that best meets property owners' reasonable preferences. Preferred Corridor Evaluation Before conducting public outreach, which is not required by Weld County's USR permit application process, and to determine the alternative corridor least impactful to local communities, Thornton conducted a series of outreach meetings with local governments and agencies that could be impacted by the TWP. Input from local governments and agencies was utilized in developing alternative corridors and identifying the preferred corridor. An evaluation area was established for developing alternative corridors. The evaluation area consists of a an approximate 4- to 57/2 -mile wide path from County Road 96 south to County Road 2. The evaluation area is bounded by 1-25 on the west and County Road 17 %z on the east. Alternative corridors within the evaluation area were identified using readily and publicly available geographic information system (GIS) data. Guidelines used to identify the alternative corridors include the following: + Input from potentially affected local governments • Minimizing impacts to ROW + Minimizing impacts to water bodies and wetlands + Bypassing geological hazardous areas • Minimizing impacts to environmentally sensitive areas such as open space or conservation areas + Minimize impacts to congested areas, typically in developed, densely populated areas TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVAL STANDARDS AND APPLICATION REQUIREMENTS G-20 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • Utilizing Thornton -owned property • Following ROW/easements/property lines Four'A-mile wide alternative corridors were initially developed based on input received from local government outreach. These four alternative corridors were analyzed using non -economic data to determine the preferred corridor. The non -economic criteria and method of measurement used in the evaluation of alternative corridors included the following: + Local Government Preference - Rating based on compliance with local government preferences • Geologic Hazards - Estimated length within areas identified as having mine subsidence + Community Impact - Number of local governments crossed + Wetland/Riparian Crossing - Estimated length of wetland/riparian areas crossed • Floodplain Crossings - Estimated length of floodplain areas crossed + Parcel Owners - Number of unique parcel owners crossed • ROW - Estimated possible length of water pipeline in ROW Information regarding the preferred corridor alternative analysis and selection process is included in Technical Report Thornton Water Project, Reach 2 Alternative Corridors Analysis, September 2016 (see Appendix F). The location of the preferred corridor was based on the TWP purpose and need, as well as information and guidance received from Weld County Public Works and Planning staff, Dacono, Firestone, Mead, Milliken, Johnstown, Timnath, Windsor and others. Preferred Route Development After the preferred corridor was established, specific alignments within the preferred corridor were identified to determine the preferred route for the water pipeline alignment. Thornton established criteria, reviewed existing infrastructure and encumbrances, and considered input from property owners, Weld County Public Works staff, and local governments to determine the water pipeline alignment. The preferred route was developed to not be located within Weld County ROW or future planned ROW except where it must cross ROW. Thornton understands that, if the TWP crosses Weld County ROW, then use of that ROW will require Weld County approval. Thornton reviewed GMA boundaries and transportation master plans for Dacono, Berthoud, Firestone, Forth Lupton, Frederick, Johnstown, Mead, Milliken, Platteville, Severance, Timnath, and Windsor to determine the extent of future ROW within GMA boundaries. Thornton will coordinate the location of the water pipeline with these municipalities as appropriate where the water pipeline is located within the municipality's boundary. Where practicable, the criteria for developing the preferred route in unincorporated Weld County included: • Be outside current and future planned road ROW. + Be adjacent to roads, current or future road ROW, existing utility easements, and property lines. + Minimize impacts to agricultural use. • Consider property owner preference + Minimize impacts to existing structures. • Cross waters, irrigation ditches, roads, and railroads perpendicular to the feature. TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-21 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION • Minimize road crossings. • Minimize impacts to environmental and cultural resources. + Minimize impacts to open lands/conservation easements. • Provide a sound engineering solution Thornton reviewed aerial photography and performed site reconnaissance of the preferred corridor to develop a draft route based on the criteria listed above. Title records were reviewed, and rights of entry were requested for properties crossed by the draft route to determine existing encumbrances on these properties. Next, Thornton began discussions with property owners and conducted environmental surveys and planimetric survey of property boundaries, existing infrastructure, and utilities on the properties for which written right of entry was granted to Thornton by the property owner. As part of the surveys, existing easement locations and easement restrictions were identified. Thornton approached easement holders without exclusive rights to discuss opportunities for shared and/or overlapping easements. During discussions with property owners, Thornton reviewed possible water pipeline locations to minimize impacts. Based on information obtained from surveys, easement holders, and property owner discussions, the draft route was revised and refined to reflect the water pipeline alignment for the TWP as presented in Supplement 1. ROW Feasibility Analysis At the Weld County Land Use hearing on August 26, 2020, the BOCC changed its position on its preference and policy to not allow parallel running utilities in the Weld County ROW and continued the hearing until September 16, 2020 for Thornton to discuss locating portions of the water pipeline in Weld County ROW with Weld County Public Works staff. During that time, Thornton and Weld County Public Works staff worked together and preliminarily identified six (6) areas where the water pipeline could potentially be located in Weld County ROW. Those locations were presented by Weld County Public Works staff to the BOCC at the continued hearing on September 16, 2020. Staff indicated that those potential areas could be used for the water pipeline subject to more detailed analysis by Thornton. The BOCC then continued the hearing until May 5, 2021. Thornton performed a ROW feasibility analysis that included non -economic factors for evaluating locating the TWP water pipeline within ROW, including at the six (6) locations presented to the BOCC at the September 16, 2020 hearing, as well as a comparative cost analysis on a per linear foot of pipeline installed. The ROW feasibility analysis was further based on clarification provided by Weld County Public Works staff regarding Weld County requirements and conditions that would need to be met to locate the water pipeline in Weld County ROW. The ROW feasibility analysis included differential costs for locating the water pipeline within Weld County ROW, including at the six (6) locations. The ROW feasibility analysis concluded that locating the water pipeline in Weld County ROW was not in the best interests of Weld County or Thornton. The ROW feasibility analysis is summarized in Section C.2.b and is presented in Technical Memorandum TWP Feasibility of Alternatively Locating TWP Water Pipeline within Weld County Right -of -Way, included in Appendix G, ROW Feasibility Analysis. TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-22 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Installation of the water pipeline in ROW compared to installation in a private easement has the following detrimental impacts: • Significant traffic impacts including requiring full road closures and multiple detours and causing traffic delays that increase safety risk to traveling public and construction workers. • Increased risk that TWP water pipeline will be damaged by third parties because Thornton would not have control of other work activities within Weld County ROW that could lead to inadvertent failure, requiring road closure and detours to perform repairs. + Significant safety risk to the traveling public and the workers tasked with maintaining the water pipeline during pipeline maintenance activities. • Increased impacts to locating future utilities within the right-of-way and adjacent to the TWP water pipeline. • Impacts to future Weld County roadway projects by increasing coordination needs and design and construction schedules as those roadway projects may require adjustment or relocation of the TWP water pipeline. + Additional costs of approximately $40,000,000 would be incurred to locate the TWP water pipeline within available right-of-way, not including the costs already paid for private easements. + Additional costs of approximately $8,300,000 would be incurred for the six (6) locations presented to the BOCC at the September 16, 2020 hearing. Based on these impacts identified in the ROW feasibility analysis, Thornton determined not to relocate the water pipeline into Weld County ROW. See Appendix G for additional information. Final Water Pipeline Easement Development After the Weld County ROW analysis was complete, Thornton has continued working with impacted property owners to determine the location for the water pipeline that best meets property owners' reasonable preferences and to negotiate easements. Thornton has, at the time Supplement 2 was filed, acquired over 85% of the easements necessary to construct the full length of the TWP and its appurtenances in unincorporated Weld County, and has purchased land in fee for the water tank. Thornton will acquire additional easements and fee parcels in advance of the May 5, 2021 hearing, and will provide an update to the BOCC in advance of that hearing. Based on information obtained from surveys, easement holders, and property owner discussions, the preferred route was revised and refined to reflect the water pipeline alignment for the TWP as presented in this Supplement 2 and shown in Figure C.2.a.la and C.2.a.lb. Water Tank and Pump Station Locations Site selection for the water tank and pump stations are based on the water pipeline alignment and the hydraulic operation of the system. These appurtenances are located along the water pipeline to avoid unnecessary lateral pipelines from the water pipeline to the appurtenance and improve hydraulic efficiency. The following describes the operation of the system, and reasons for selection of each of the sites for these appurtenant facilities. The TWP is comprised of the water pipeline, a 1 -million -gallon water tank, and three pump stations (one source water pump station in Larimer County; two pump stations in Weld County). Domestic water is obtained from WSSC Reservoir No. 4 in Larimer County and pumped into the water pipeline via the source water pump station at WSSC Reservoir No. 4. The source water pump station supplies TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-23 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION domestic water to the water tank near the intersection of County Road 92 and County Road 13 in Weld County. The water tank provides hydraulic balancing for system operation. From the water tank, water flows through the water pipeline by gravity to Pump Station 1 located at the intersection of County Road 50 and County Road 13%. Pump station requirements are based on the pump head required to convey the maximum design flow of 40 mgd to Thornton. By using two pump stations instead of one in Weld County, the maximum operating pressure of the water pipeline can be maintained under 350 pounds per square inch (psi). If the required head was weighted more heavily to one of the pump stations, or if only a single pump station was used, maximum operating pressure in the water pipeline would increase from 350 up to 600 psi, depending upon pump station arrangement. By using two pump stations in Weld County, maximum operating pressure is lowered, increasing safety and decreasing the operating cost of the water pipeline. Pump Station 1 is a vertical turbine pump station operating on pressurized cans in the flow range of about 22 to 40 mgd. Flows less than about 22 mgd can get directly to Pump Station 2 without additional pumping. Pump Station 2 is a vertical turbine pump station located at the intersection of County Road 2 and County Road 17 and operates though the entire flow range of 3 to 40 mgd. Pump Station 2 operates on pressurized cans from 3 mgd to about 22 mgd. Flows greater than about 22 mgd are routed through a 1 -million -gallon forebay co -located with Pump Station 2. The inclusion of the water tank at County Road 92 and forebay at Pump Station 2 provide storage that allow the system to be operated throughout the design range of flows without the requirement that any two pump stations be paced at the same flow. This simplifies operation of the system and provides additional safety in controlling transient pressures that could damage the water pipeline. Site selection for the water tank is based on placing it at the highest point along the water pipeline. Situating the water tank at the high point provides efficiency in system operation, as the source water pump station must only provide enough head to fill the water tank. It also allows water to be conveyed by gravity from the water tank for the longest distance in the water pipeline in Weld County. The high point in the water pipeline is located approximately 600 feet south of County Road 92 on the east side of County Road 13. This location is next to an existing water tank and is approximately 1,200 feet from the nearest residential structure (located in Larimer County). Pump Station 1 is located based on hydraulic operation of the system and the profile of the water pipeline. The divide between the Big Thompson River and Little Thompson River drainages along the water pipeline alignment is located approximately 2,000 feet north of Highway 60 along County Road 13. This is a significant high point in the water pipeline. Based on the criteria to roughly split required head between the two pump stations in Weld County, Pump Station 1 needs to be located north of this point. Maximum operating pressure increases in the water pipeline between the divide and the location of Pump Station 1, so Pump Station 1 should be located as close to the divide as possible. Given existing constraints along the water pipeline alignment like existing and planned development in Johnstown, parcel size, and access availability, the closest appropriate site for Pump Station 1 is where the water pipeline crosses County Road 50. The location is currently used for agricultural operations and oil and gas pipelines. Pump Station 2 is located based on hydraulic operation of the system and the profile of the water pipeline. The location is based on the furthest point south for which Pump Station 1 can provide hydraulic head for the maximum design flow of 40 mgd, while considering existing and future development and access. Pump Station 2 is located at the northeast corner of the intersection of County Road 2 and County Road 17, in a dryland agricultural field. This location provides efficient hydraulic operation and keeps operating pressures in the water pipeline lower than they otherwise TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-24 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION would be if Pump Station 2 was located further north. Locations considered to the south are too high in elevation for locating Pump Station 2. WCC Sections 23-2-480 A.7 and 23-2-490 G The nature and location or expansion of the PIPELINE — DOMESTIC WATER will not unreasonably interfere with any significant wildlife habitat and will not unreasonably affect any endangered wildlife species, unique natural resource, known historic landmark or archaeological site within the affected area. Supplement 2 demonstrates that the standards described in WCC Sections 23-2-480 A.7 and 23-2-490 G are met as presented in Section 4 Questionnaire Planning, Section C.2.b, Section C.2.c, Section C.2.d, Section C.2.i, Appendix A, and Appendix F. The TWP will utilize trenchless construction methods for water pipeline installation to minimize effects to natural resources such as jurisdictional waters, including streams, rivers, lakes, and wetland areas. The area disturbed for constructing the water pipeline will be restored to pre - construction conditions, including grade and vegetation, thus minimizing long-term impacts. The TWP was assessed for potential jurisdictional waters and wildlife habitat using publicly available mapping and aerial photographs, and by conducting a windshield survey of areas that could be publicly accessed. Information on terrestrial and aquatic animals was obtained from various sources including CPW, Colorado Natural Diversity Information System, Colorado Natural Heritage Program, USFWS, published literature, and field surveys. Site surveys will be performed to aid in the determination of jurisdictional waters and wildlife habitat. Information from the assessment and survey information will be used to develop final design. Mitigation methods to minimize impacts to these areas will be incorporated into the design and construction as appropriate. Jurisdictional water crossings will be constructed using trenchless construction methods. An assessment was conducted for potential habitat of federally threatened, endangered, and candidate species protected under the Endangered Species Act. The TWP will have no effect on federally listed threatened, endangered, or candidate wildlife or plant species. Mitigation measures such as restricting construction during nesting seasons may be implemented as appropriate. An assessment of the TWP was conducted for wildlife habitat and migration corridors. A description of the ways that wildlife use the area within and near the TWP, and the species involved with proposed setbacks and other potential mitigation measures, can be found in the Revised Natural and Cultural Resources Assessment in Appendix A. The TWP could temporarily impede movement of wildlife and result in the displacement of some individuals during construction activities. During construction, wildlife crossovers (trench plugs) with ramps on each side of the trench could be installed at well-defined game trails. The water pipeline would not provide a barrier to wildlife movement over the long term because the water pipeline would be buried. Thornton has sent letters to CPW and USFWS to initiate coordination activities and Thornton has conducted coordination meetings with CPW and will continue coordination with CPW as the TWP is developed and implemented. CPW has published recommended buffer zones and seasonal restrictions for raptors in Colorado to minimize the effects of disturbance. Thornton will review the CPW raptor nest data and perform nest surveys for raptors before the nesting season to identify potential active raptor nests before construction. Thornton will coordinate with CPW regarding any potential conflicts between scheduled construction and potential raptor nests and develop measures acceptable to CPW to minimize impacts on nesting raptors. TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-25 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Impacts to wildlife areas will be temporary and are anticipated to only occur while construction is taking place. After construction is completed, areas not designated for above ground appurtenances will be restored to pre -construction grades and vegetation. The water pipeline and fiber optic cable will be compatible with existing wildlife uses and wildlife use within the permanent easement can continue after construction. The TWP is not anticipated to impact wildlife uses, such as hunting, trapping, and fishing practices once the water pipeline and fiber optic cable are installed. A Class I File Search and Literature Review for cultural resources was conducted for the TWP in Weld County. Based on that review, there are no cultural sites or structures that are listed on the State and National Register of Historic places within the TWP. Additional information can be found in the Revised Natural and Cultural Resources Assessment in Appendix A. Thornton reviewed the list of historic townsites provided by Weld County staff with Weld County Online Mapping and no historic townsites were identified within the TWP. WCC Sections 23-2-480 A.8 and 23-2-490 H No adverse impact from stormwater runoff to the PUBLIC RIGHTS -OF -WAY and/or surrounding properties as a result of the PIPELINE - DOMESTIC WATER. Supplement 2 demonstrates that the standards described in WCC Sections 23-2-480 A.8 and 23-2- 490 H are met as presented in Section 4 Questionnaire Planning and Public Works, Section 16, Section C.2.c, Section C.2.d, Section C.2.f, Section C.2.i, and Appendix C. The water pipeline and associated temporary staging areas and the water tank site fall under exceptions to the stormwater detention requirements per WCC Section 8-11-401. The exceptions that apply are as follows: • Water pipeline: Exception 5 "Pipelines or transmission lines, excluding laydown yards, metering sites, substations, and any other above ground appurtenances." + Water tank site: Exception 9 "Non -Urbanizing areas where the total pre-existing and post development impervious area produces stormwater runoff of less than, or equal to, five (5) cfs for the 1 -hour, 100 -year, storm event. This exception shall be supported by calculations signed and stamped by a Colorado Licensed Professional Engineer." Drainage narratives for the water pipeline and for the water tank are provided in Section 16. Preliminary drainage reports for the pump stations are provided in Section 16. Based on the preliminary analysis, detention ponds are anticipated to be required at the pump station sites. Stormwater facilities will be designed and constructed in accordance with Weld County and other requirements as applicable. If used by the TWP contractors and in accordance with Weld County staff recommended conditions of approval, drainage narratives for staging areas will be submitted before start of construction. Offsite stormwater originates on lands adjacent to the TWP, and drains over land and via drainageways onto the water pipeline easement. Water originates from multiple locations along the TWP depending on topography. Disturbed areas for water pipeline construction will be restored to pre -construction grades after construction and historic flows will be maintained. Stormwater will exit the water pipeline easement by overland flow or flow in existing drainageways. Water will leave the site from multiple locations along the TWP depending on topography. TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-26 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Prior to construction, Thornton and/or the TWP contractors will obtain the required Weld County grading permit and the CDPHE Stormwater Discharge Associated with Construction Activity — General Permit. Construction SWMPs will be developed under the general permit to protect the quality of stormwater runoff during construction in accordance with the Construction Stormwater Discharge Permit requirements. Surface drainage BMPs implemented during construction will include application of erosion control techniques and the successful revegetation of disturbed areas. SWMPs will include detailed descriptions of BMPs that will be used to control erosion. After construction is completed, areas not designated for above ground appurtenances will be restored to pre -construction grades and vegetation. BMPs will be maintained and inspected. Failed BMPs will be replaced as required. After work is complete and final stabilization has been achieved, temporary BMPs will be removed. Final stabilization will be reached as defined in the Weld County Grading Permit and Stormwater Discharge Associated with Construction Activity - General Permit. Weld County Online Mopping was reviewed and the TWP does not fall within any areas designated as municipal separate storm sewer system (MS4) in unincorporated Weld County. Appropriate technical manuals will be referenced at the time of development of the SWMPs, and select and indicate appropriate locations for BMPs. Example descriptions of common construction BMPs that could be used during construction are provided for reference purposes in Appendix C. Areas disturbed for construction of the water pipeline will be restored following construction to pre - construction grades and vegetation conditions with few exceptions. An example of an exception would be minor grading necessary following construction to restore a stable slope. In general, following construction, the restored areas will drain in the same manner and at generally the same rate as it did before construction. To mitigate impacts caused by erosion, restoration activities for the TWP will consist of vegetation restoration and maintenance of areas disturbed by the TWP. Effects to vegetation along the easement areas will be temporary and mostly associated with construction. Potential future repairs and maintenance could affect discrete areas of vegetation so that the water pipeline and appurtenances may be accessed in a particular location. Any vegetated areas disturbed during maintenance or any required repairs will be restored by the methods used during construction. WCC Application Requirements 23-2-500 Application for use by special review permit. Supplement 2 demonstrates that the requirements described in WCC Section 23-2-500 are met. Supplement 2 includes a complete USR Application form signed by city of Thornton; Brett E. Henry, Executive Director- Infrastructure Department. Supplement 2 includes supporting documents required by the WCC. 23-2-510 Application Requirements Supplement 2 demonstrates that the requirements described in WCC Section 23-2-510 are met as presented in Sections 1, Section 4 through Section 6, Section 16, Section 17, Section 22 through Section 24, Section 26, Section A through Section F, and Appendix A, Appendix C, Appendix E, Appendix F, and Appendix G. Section A presents the applicant's (Thornton's) name and telephone number as required by WCC Section 23-2-510 A. TWP USR SUPPLEMENT 2 SECTION G W CC APPROVAL STANDARDS AND APPLICATION REQUIREMENTS G-27 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION Section B presents the applicant's (Thornton's) address and general OFFICE as required by WCC Section 23-2-510 B. Section C presents a Summary Statement of the project as required by WCC Section 23-2-510 C. Section D and Section 5 presents a certified list of names, addresses and corresponding Parcel Identification Numbers assigned by the County Assessor of owners of surface properties located within one hundred fifty (150) feet of the PIPELINE — DOMESTIC WATER in accordance with WCC Section 23-2-510 D. Section E and Section 6 presents the names and addresses of any owner, operator, or user of any irrigation ditch, lateral, or pipeline that traverses the property in accordance with WCC Section 23-2-510 E. Section F and Section 26 presents the application fee in accordance with WCC Section 23-2-510 F. Section 16, Section 17, Section 22, Section 23, Section 24, Appendix A and Appendix C presents procedures to mitigate any adverse impacts of the TWP as required by WCC Section 23-2-510 C.2.c. 23-2-520 Mapping requirements for PIPELINE — DOMESTIC WATER maps. Supplement 2 demonstrates that the requirements described in WCC Sections 23-2-440 F, 23-2-520 C, 23-2-520 D.1 through 23-2-520 D.8, 23-2-520 E, 23-2-520 F, 23-2-520 !, and 23-2-5201 are met as presented in Second Supplemental Permit Application, Volume 3, USR USR18-0130 Permit Maps. In accordance with WCC Section 23-2-440 F, this Supplement 2 includes an electronic file (Adobe Acrobat © Portable Document Format, PDF) of Second Supplemental Permit Application Volume 3, USR18-0130 Permit Maps for Weld County's preliminary approval. Thornton has met multiple times with staff from the Weld County Planning and Public Works departments regarding the TWP, the USR permit application process, and permit requirements. The Pre -Application meetings held on May 27, 2016, August 25, 2016, January 17, 2019, and March 13, 2020 along with follow-up discussions provided Thornton with guidance and recommendations from Weld County staff to help ensure a complete permit application submittal. Thornton has continued to consult with the Weld County Planning staff throughout the development of this Supplement 2, including periodic telephone and e-mail communications. The USR maps provided are in accordance with WCC Section 23-2-440 F, and WCC Section 23-2-520. Approval Standards and Requirements Cross -Reference Table GA presents a cross-reference guide showing how this Supplement 2 meets the WCC approval standards, application requirements, and drawing requirements, as well as consistency with the WCC Chapter 22. TWP USR SUPPLEMENT 2 SECTION G W CC APPROVAL STANDARDS AND APPLICATION REQUIREMENTS G-28 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE G.4 WCC Standards and Application Requirements Cross Reference Guide Supplement 2 Section WCC Section 23-2-480 Duties of planning commission/WCC Section 23-2-490 Duties of Board of County Commissioners WCC Section 23-2-500 Application for use by special review permit. WCC Section 23-2-510 Application Requirements WCC Section 23-2-520 Mapping Requirements for PIPELINE - DOMESTIC WATER. Consistency with WCC Chapter 22 480 A.1/23-2-490 A - All reasonable efforts have been made to avoid irrigated cropland or to minimize the negative impacts on agricultural USES and lands, 23-2-480 A.2/23-2-490 B The PIPELINE - DOMESTIC WATER will not have an undue adverse effect on existing and future DEVEOPMENT of the surrounding area, as set forth in applicable MASTER PLANS. 23-2-480 A.3/23-2-490 C The design of the proposed PIPELINE - DOMESTIC WATER mitigates negative impacts on the surrounding area to the greatest extent feasible. 23-2-480 A.4/23-2-490 D The site shall be maintained in such a manner so as to control soil erosion, dust and the growth of NOXIOUS WEEDS. 23-2-480 A.5/23-2-490 E The applicant has agreed to implement any reasonable measures deemed necessary by the Board of County Commissioners to ensure that the health, safety and welfare of the inhabitants of the COUNTY will be protected, and to mitigate or minimize any potential adverse impacts from the proposed PIPELINE - DOMESTIC WATER. 23-2-480 A.5/23-2-490 F All reasonable alternatives to the proposal have been adequately assessed, and the proposed action is consistent with the best interests of the people of the COUNTY and represents a balanced use of resources in the affected area. 23-2-480 A.7/23-2-490 G The nature and location or expansion of the PIPELINE - DOMESTIC WATER will not unreasonably interfere with any significant wildlife habitat and will not unreasonably affect any endangered wildlife species, unique natural resource, known historic landmark or archaeological site within the affected area. 23-2-480 A.8/23-2-490 H No adverse impact, from stormwater runoff, to the PUBLIC RIGHTS -OF -WAY and/or surrounding properties as a result of the PIPELINE - DOMESTIC WATER. 23-2-510 A - The applicant's name and telephone number. 23-2-510 B - Address of the applicant. 23-2-510 C - Summary statement of the project. 23-2-510 D -A Certified List of Names, Addresses and the Corresponding Parcel Identification Numbers Assigned by the County Assessor of Owner of Surface Properties Located Within One Hundred Fifty (150) Feet of the Pipeline — Domestic Water 23-2-510 E -The Names and Addresses of Any Owner, Operator, or User of Any Irrigation Ditch, Lateral, or Pipeline that Traverses the Property 23-2-510 F - The Application Fee Volume 1 of 4 USR Procedural Guide Checklist Section 1 -Application Form ✓ Section 2 -Authorization Form, If Applicable Section 3 -Incorporation or Trust Documents Section 4 -USR Questionnaire Planning Questions ✓ ✓ ✓ ✓ Environmental Health Questions ✓ Public Works Questions ✓ ✓ Building Questions ✓ Section 5 -List of Property Owners ✓ Section 6 -Irrigation Ditch, Lateral, or Pipeline Owners, If Applicable ✓ Section 7 -Mineral Owners Agreement, If Applicable Section 8 -Recent Deed Section 9 -Certificate of Conveyances Form Section 10 -Statement of Taxes Section 11-USR Map ✓ Section 12 -Notice of Inquiry, If Applicable Section 13 -Pre -application Meeting Minutes Section 14 -Evidence of Adequate Water Supply Section 15 -Evidence of Adequate Sewage Disposal Section 16 -Drainage ✓ ✓ ✓ ✓ ✓ Section 17 -Traffic Narrative ✓ ✓ ✓ ✓ ✓ Section 18 -Sign Plan, If Applicable TWP USR SUPPLEMENT 2 SECTION G W CC APPROVAL STANDARDS AND APPLICATION REQUIREMENTS G-29 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE G.4 WCC Standards and Application Requirements Cross Reference Guide Supplement 2 Section WCC Section 23-2-480 Duties of planning commission/WCC Section 23-2-490 Duties of Board of County Commissioners WCC Section 23-2-500 Application for use by special review permit. WCC Section 23-2-510 Application Requirements WCC Section 23-2-520 Mapping Requirements for PIPELINE - DOMESTIC WATER. Consistency with WCC Chapter 22 480 A.1/23-2-490 A - All reasonable efforts have been made to avoid irrigated cropland or to minimize the negative impacts on agricultural USES and lands, 23-2-480 A.2/23-2-490 B The PIPELINE - DOMESTIC WATER will not have an undue adverse effect on existing and future DEVEOPMENT of the surrounding area, as set forth in applicable MASTER PLANS. 23-2-480 A.3/23-2-490 C The design of the proposed PIPELINE - DOMESTIC WATER mitigates negative impacts on the surrounding area to the greatest extent feasible. 23-2-480 A.4/23-2-490 D The site shall be maintained in such a manner so as to control soil erosion, dust and the growth of NOXIOUS WEEDS. 23-2-480 A.5/23-2-490 E The applicant has agreed to implement any reasonable measures deemed necessary by the Board of County Commissioners to ensure that the health, safety and welfare of the inhabitants of the COUNTY will be protected, and to mitigate or minimize any potential adverse impacts from the proposed PIPELINE - DOMESTIC WATER. 23-2-480 A.5/23-2-490 F All reasonable alternatives to the proposal have been adequately assessed, and the proposed action is consistent with the best interests of the people of the COUNTY and represents a balanced use of resources in the affected area. 23-2-480 A.7/23-2-490 G The nature and location or expansion of the PIPELINE - DOMESTIC WATER will not unreasonably interfere with any significant wildlife habitat and will not unreasonably affect any endangered wildlife species, unique natural resource, known historic landmark or archaeological site within the affected area. 23-2-480 A.8/23-2-490 H No adverse impact, from stormwater runoff, to the PUBLIC RIGHTS -OF -WAY and/or surrounding properties as a result of the PIPELINE - DOMESTIC WATER. 23-2-510 A - The applicant's name and telephone number. 23-2-510 B - Address of the applicant. 23-2-510 C - Summary statement of the project. 23-2-510 D -A Certified List of Names, Addresses and the Corresponding Parcel Identification Numbers Assigned by the County Assessor of Owner of Surface Properties Located Within One Hundred Fifty (150) Feet of the Pipeline — Domestic Water 23-2-510 E -The Names and Addresses of Any Owner, Operator, or User of Any Irrigation Ditch, Lateral, or Pipeline that Traverses the Property 23-2-510 F - The Application Fee Volume 1 of 4 USR Procedural Guide Checklist Section 19 -Nuisance Abatement Plan, If Applicable Section 20 -Landscape and Screening Plan, If Applicable Section 21 -Decommissioning Plan, If Applicable Section 22 -Draft Emergency Incident Action Plan, If Applicable Section 23 -Noise Study, If Applicable S/ 1/ 1/ Section 24 -Soils Report .1/ 1/ 1/ Section 25 -Community Meeting (Optional) 1/ Section 26 -Application Fee .1/ Section 27 -Investigation Fee WCC Section 23-2-510 Section A -Applicant's Name and Telephone Number .1/ Section B -Address of the Applicant .1/ Section C -Summary Statement of the Project C.1 -Source, Capacity, Size, Destination and Type of Facilities, Support Structures, Lines, etc. Involved ✓ C.2 -A Detailed Report ✓ C.2.a -A Description of the Pipeline— Domestic Water ✓ C.2.b-A Description of the Preferred Route or Location of the Pipeline — Domestic Water and Reasons for Its Selection ✓ ✓ ✓ ✓ ✓ ✓ ✓ C.2.c -Procedures to be Employed in Mitigating Any Adverse Impacts of the Proposed Routes or Sites ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ C.2.d -An Outline of the Planned Construction, Including Startup and Commissioning Schedule, to Include the Number of States and Timing of Each ✓ ✓ ✓ ✓ TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-30 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE G.4 WCC Standards and Application Requirements Cross Reference Guide Supplement 2 Section WCC Section 23-2-480 Duties of planning commission/WCC Section 23-2-490 Duties of Board of County Commissioners WCC Section 23-2-500 Application for use by special review permit. WCC Section 23-2-510 Application Requirements WCC Section 23-2-520 Mapping Requirements for PIPELINE - DOMESTIC WATER. Consistency with WCC Chapter 22 480 A.1/23-2-490 A - All reasonable efforts have been made to avoid irrigated cropland or to minimize the negative impacts on agricultural USES and lands, 23-2-480 A.2/23-2-490 B The PIPELINE - DOMESTIC WATER will not have an undue adverse effect on existing and future DEVEOPMENT of the surrounding area, as set forth in applicable MASTER PLANS. 23-2-480 A.3/23-2-490 C The design of the proposed PIPELINE - DOMESTIC WATER mitigates negative impacts on the surrounding area to the greatest extent feasible. 23-2-480 A.4/23-2-490 D The site shall be maintained in such a manner so as to control soil erosion, dust and the growth of NOXIOUS WEEDS. 23-2-480 A.5/23-2-490 E The applicant has agreed to implement any reasonable measures deemed necessary by the Board of County Commissioners to ensure that the health, safety and welfare of the inhabitants of the COUNTY will be protected, and to mitigate or minimize any potential adverse impacts from the proposed PIPELINE - DOMESTIC WATER. 23-2-480 A.5/23-2-490 F All reasonable alternatives to the proposal have been adequately assessed, and the proposed action is consistent with the best interests of the people of the COUNTY and represents a balanced use of resources in the affected area. 23-2-480 A.7/23-2-490 G The nature and location or expansion of the PIPELINE - DOMESTIC WATER will not unreasonably interfere with any significant wildlife habitat and will not unreasonably affect any endangered wildlife species, unique natural resource, known historic landmark or archaeological site within the affected area. 23-2-480 A.8/23-2-490 H No adverse impact, from stormwater runoff, to the PUBLIC RIGHTS -OF -WAY and/or surrounding properties as a result of the PIPELINE - DOMESTIC WATER. 23-2-510 A - The applicant's name and telephone number. 23-2-510 B - Address of the applicant. 23-2-510 C - Summary statement of the project. 23-2-510 D -A Certified List of Names, Addresses and the Corresponding Parcel Identification Numbers Assigned by the County Assessor of Owner of Surface Properties Located Within One Hundred Fifty (150) Feet of the Pipeline — Domestic Water 23-2-510 E -The Names and Addresses of Any Owner, Operator, or User of Any Irrigation Ditch, Lateral, or Pipeline that Traverses the Property 23-2-510 F - The Application Fee Volume 1 of 4 WCC Section 23-2-510 Section C -Summary Statement of the Project C.2.e-Information of Any Neighborhood Meeting Conducted, to Include the Location, Date, Time, Attendance and Method of Advertising ✓ C.2.f-A Description of the Hazards, if Any of Fire, Explosion and Other Dangers to the Health, Safety and Welfare of Employees and the General Public ✓ ✓ C.2.g -A Description of Emergency Procedures to be Followed in Case of a Reported Failure or Accident Involving the Proposed Pipeline— Domestic Water ✓ ✓ C.2.h-A Description of the Method or Procedures to Be Employed to Avoid or Minimize the Impacts on Irrigated Agricultural Land ✓ ✓ ✓ C.2.i -A Discussion of How the Proposal Conforms With the Guidelines of Chapter 22 of This Code and Any Other Applicable Code Provision or Ordinance in Effect ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ C.2.j -A Decommissioning Plan ✓ C.2.k -A Traffic Narrative Describing Construction Traffic and Permanent or Temporary Access Points ✓ C.2.l -A Description of any Haul Routes to be Used During Construction, Identifying Streets/Roads and Bridges involved and the Weight of the Loads ✓ C.2.m -Soils Reports Required for Pipeline Crossings or Any Pipeline Encroaching in Public Right -of -Way, if Required by the Department of Public Works ✓ TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G- 31 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE G.4 WCC Standards and Application Requirements Cross Reference Guide Supplement 2 Section WCC Section 23-2-480 Duties of planning commission/WCC Section 23-2-490 Duties of Board of County Commissioners WCC Section 23-2-500 Application for use by special review permit. WCC Section 23-2-510 Application Requirements WCC Section 23-2-520 Mapping Requirements for PIPELINE - DOMESTIC WATER. Consistency with WCC Chapter 22 480 A.1/23-2-490 A - All reasonable efforts have been made to avoid irrigated cropland or to minimize the negative impacts on agricultural USES and lands, 23-2-480 A.2/23-2-490 B The PIPELINE - DOMESTIC WATER will not have an undue adverse effect on existing and future DEVEOPMENT of the surrounding area, as set forth in applicable MASTER PLANS. 23-2-480 A.3/23-2-490 C The design of the proposed PIPELINE - DOMESTIC WATER mitigates negative impacts on the surrounding area to the greatest extent feasible. 23-2-480 A.4/23-2-490 D The site shall be maintained in such a manner so as to control soil erosion, dust and the growth of NOXIOUS WEEDS. 23-2-480 A.5/23-2-490 E The applicant has agreed to implement any reasonable measures deemed necessary by the Board of County Commissioners to ensure that the health, safety and welfare of the inhabitants of the COUNTY will be protected, and to mitigate or minimize any potential adverse impacts from the proposed PIPELINE - DOMESTIC WATER. 23-2-480 A.5/23-2-490 F All reasonable alternatives to the proposal have been adequately assessed, and the proposed action is consistent with the best interests of the people of the COUNTY and represents a balanced use of resources in the affected area. 23-2-480 A.7/23-2-490 G The nature and location or expansion of the PIPELINE - DOMESTIC WATER will not unreasonably interfere with any significant wildlife habitat and will not unreasonably affect any endangered wildlife species, unique natural resource, known historic landmark or archaeological site within the affected area. 23-2-480 A.8/23-2-490 H No adverse impact, from stormwater runoff, to the PUBLIC RIGHTS -OF -WAY and/or surrounding properties as a result of the PIPELINE - DOMESTIC WATER. 23-2-510 A - The applicant's name and telephone number. 23-2-510 B - Address of the applicant. 23-2-510 C - Summary statement of the project. 23-2-510 D -A Certified List of Names, Addresses and the Corresponding Parcel Identification Numbers Assigned by the County Assessor of Owner of Surface Properties Located Within One Hundred Fifty (150) Feet of the Pipeline — Domestic Water 23-2-510 E -The Names and Addresses of Any Owner, Operator, or User of Any Irrigation Ditch, Lateral, or Pipeline that Traverses the Property 23-2-510 F - The Application Fee Volume 1 of 4 WCC Section 23-2- 510 Section D -A Certified List of Names, Addresses and the Corresponding Parcel Identification Numbers Assigned by the County Assessor of Owner of Surface Properties Located Within One Hundred Fifty (150) Feet of the Pipeline— Domestic Water ✓ Section E -The Names and Addresses of Any Owner, Operator, or User of Any Irrigation Ditch, Lateral, or Pipeline that Traverses the Property ✓ Section F -The Application Fee ✓ WCC Sections 23-2-480 and 23-2-490 Section G -WCC Approval Standards Volume 2 of 4 Appendix A Natural and Cultural Resources Assessment ✓ ✓ ✓ ✓ ✓ ✓ Appendix B Stakeholder Outreach Information ✓ Appendix C Best Management Practices ✓ ✓ Appendix D Soils Reports ✓ ✓ ✓ Appendix E Community Outreach Information ✓ Appendix F Alternatives Analysis ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ Appendix G ROW Feasibility Analysis ✓ ✓ ✓ TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-32 THORNTON WATER PROJECT WELD COUNTY USR SECOND SUPPLEMENTAL PERMIT APPLICATION TABLE G.4 WCC Standards and Application Requirements Cross Reference Guide Supplement 2 Section WCC Section 23-2-480 Duties of planning commission/WCC Section 23-2-490 Duties of Board of County Commissioners WCC Section 23-2-500 Application for use by special review permit. WCC Section 23-2-510 Application Requirements WCC Section 23-2-520 Mapping Requirements for PIPELINE - DOMESTIC WATER. Consistency with WCC Chapter 22 480 A.1/23-2-490 A - All reasonable efforts have been made to avoid irrigated cropland or to minimize the negative impacts on agricultural USES and lands, 23-2-480 A.2/23-2-490 B The PIPELINE - DOMESTIC WATER will not have an undue adverse effect on existing and future DEVEOPMENT of the surrounding area, as set forth in applicable MASTER PLANS. 23-2-480 A.3/23-2-490 C The design of the proposed PIPELINE - DOMESTIC WATER mitigates negative impacts on the surrounding area to the greatest extent feasible. 23-2-480 A.4/23-2-490 D The site shall be maintained in such a manner so as to control soil erosion, dust and the growth of NOXIOUS WEEDS. 23-2-480 A.5/23-2-490 E The applicant has agreed to implement any reasonable measures deemed necessary by the Board of County Commissioners to ensure that the health, safety and welfare of the inhabitants of the COUNTY will be protected, and to mitigate or minimize any potential adverse impacts from the proposed PIPELINE - DOMESTIC WATER. 23-2-480 A.5/23-2-490 F All reasonable alternatives to the proposal have been adequately assessed, and the proposed action is consistent with the best interests of the people of the COUNTY and represents a balanced use of resources in the affected area. 23-2-480 A.7/23-2-490 G The nature and location or expansion of the PIPELINE - DOMESTIC WATER will not unreasonably interfere with any significant wildlife habitat and will not unreasonably affect any endangered wildlife species, unique natural resource, known historic landmark or archaeological site within the affected area. 23-2-480 A.8/23-2-490 H No adverse impact, from stormwater runoff, to the PUBLIC RIGHTS -OF -WAY and/or surrounding properties as a result of the PIPELINE - DOMESTIC WATER. 23-2-510 A - The applicant's name and telephone number. 23-2-510 B - Address of the applicant. 23-2-510 C - Summary statement of the project. 23-2-510 D -A Certified List of Names, Addresses and the Corresponding Parcel Identification Numbers Assigned by the County Assessor of Owner of Surface Properties Located Within One Hundred Fifty (150) Feet of the Pipeline — Domestic Water 23-2-510 E -The Names and Addresses of Any Owner, Operator, or User of Any Irrigation Ditch, Lateral, or Pipeline that Traverses the Property 23-2-510 F - The Application Fee 4- O 0 m m 0 O USR18-0130 Permit Maps ✓ cr 4- O cr O Drainage Narrative Water Tank Exception to Stormwater Detention 1/.(.' ✓ ✓ TWP USR SUPPLEMENT 2 SECTION G WCCAPPROVALSTANDARDS AND APPLICATION REQUIREMENTS G-33 References City of Dacono. (2018, September 25). Street Classification Map -City of Dacono Proposed Road Types. Dacono, CO. Retrieved from city of Dacono website: https://www.cityofdacono.com/Docu mentCenter/View/3448/Street-Classification-Map. City of Thornton, City Development Department. (2019)., Quarterly Housing & Population Report: 2019 4th Quarter. Thornton, CO. Colorado Earthquake Hazards Mitigation Council. (2013). Colorado Earthquake Hazards. Denver, CO: Colorado Geological Survey, Department of Natural Resources. Colorado Geological Survey. Colorado Landslide Inventory Map Viewer. Retrieved from Colorado Geological Survey website: http://coloradogeologicalsurvey.org/geologic-hazards/landslides/maps/. Colorado Department of Transportation. Online Transportation Information System, Retrieved from Colorado Department of Transportation website: http://dtdapps.coloradodot.info/otis. Federal Highway Administration (2019), Federal Highway Administration's 2019 National Bridge Inventory InfoBridge Tool. Retrieved from website: https://infobridge.fhwa.dot.gov/. Felsburg Holt & Ullevig. (2003 June). City of Dacono Transportation. Retrieved from city of Dacono website: https://www.cityofdacono.com/DocumentCenter/View/413/Transportation-Master-Plan- 2003?bidld. Felsburg Holt & Ullevig. (2008 October). Weld/Adams County Line Crossroads Alignment Study, October 2008. Retrieved from Weld County website: https://www.weldgov.com/UserFiles/Servers/Server_6/File/Departments/Public%20Works/Transpo rtation%20Planning/Transportation%20Planning/7670A683b2Ca2B8bacDB.pdf. Leonard Rice Engineers, Inc. (2008, August). Best Management Practices (BMPs) for Utility Planning and Construction Through Rural, Wetland, and Riparian Lands. Denver, CO. S.B, Roberts, Hynes, J.L, and Woodward, C.L, (2001).USGS geologic Investigations Series 1-2735, Version 1.0: USGS. Topper, R., Spray, K. L., Bellis, W.H., Hamilton, J. L., & Barkmann, P. E. (2003). Ground Water Atlas of Colorado. Special Publications, SP -53. Denver, CO: Colorado Geological Survey, Division of Minerals and Geology, Department of Natural Resources. Town of Firestone. (2013). Firestone Master Plan. Retrieved from town of Firestone website: http://www.firestoneco.gov/DocumentCenter/View/45/2013-Firestone-Master-Plan?bidld=. Town of Frederick. 2015 Comprehensive Plan. Retrieved from town of Frederick website: http://www.frederickco.gov/352/Comprehensive-Plan. Trait & Associates. (2014 November). City of Dacono Field Inventory, Regional Transportation and Drainage Impact Fee Analysis. Retrieved from city of Dacono website: https://www.cityofdacono.com/DocumentCenter/View/2374/Dacono-Regional-Transportation- Impact-Fee-Study-2015. Weld County, Weld County Public Works Department. (2020, November 9). Weld County 2045 Transportation Plan. Retrieved from Weld County website: https://www.weldgov.com/departments/publicworks/transportationplanning/2045transportati on plan. TWP USR SUPPLEMENT 2 REFERENCES R-1 Weld County. (2017, July 13). GIS Data, Road Functional Classifications & HUTF. Retrieved from Weld County website: www.weldgov.com/departments/geographic information systems/gis data/. Weld County. Weld County Code, Version May 29, 2018. Retrieved from Weld County website: https://library.municode.com/co/weld county/codes/charter and county code. Weld County. Weld County Online Mapping. Retrieved from Weld County website: https://www.co.weld.co.us/maps/propertyportal/ Urban Drainage and Flood Control District. (2010, November). Urban Storm Drainage Criteria Manual (USDCM) Volume 3. Denver, CO. United States Department of Agriculture, NRCS, Web Soil Survey application, https://websoilsurvey.sc.egov.usda.gov/App/WebSoilSurvey.aspx). TWP USR SUPPLEMENT 2 REFERENCES R-2 Hello