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Home My WebLink About20123011.tiff MEMORANDUM TO: Tom Parko, Planning Services DATE: September 24, 2012 ,AFL VL G p U _NTT-� FROM: Heidi Hansen, P.E., Public Works SUBJECT: MINF12-0001, Big Thompson Investment Holdings, Tim Naylor The Weld County Public Works Department has reviewed this sketch plan request. Comments made during this phase of the subdivision process may not be all-inclusive, as other concerns or issues may arise during the remaining application process. Any issues of concern must be resolved with the Public Works Department prior to recording the change of zone and final plat. COMMENTS: Site Plan Review: A Site Map was submitted showing the lot layout, easements and interior roadways. All interior roadways must be privately maintained by the subdivision association. The County will not accept interior roadways for County maintenance. Construction plans for all on-site improvements (roadways, drainage, etc.) are required. The plans must be signed and stamped by a professional engineer registered to practice in the State of Colorado. Drainage Report: The applicant submitted a "Drainage Report" dated 8/22/2012 signed and stamped by Chad Te Velde, PE #45122. The submitted Drainage Report is not adequate for a Final Plat submittal. The report should be a complete drainage design with construction drawings following the Final Plat Drainage Report Checklist (the checklist is attached) and should have final design of all drainage improvements for the subdivision. The report and drawings must be stamped and signed by a Professional Engineer registered to practice in the Sate of Colorado. The Report must adequately address the requirements listed in Weld County Code Chapter 8, Article 10, Section 8-11-120. The Drainage Report requirements include but are not limited to: • The drainage plan map needs to be amended to show existing and proposed culverts, swales, channels overall drainage area boundary, sub-area drainage boundaries, and the locations of proposed detention ponds. • Hydrologic computations for onsite and offsite flows. The site must detain all storm water runoff generated as a result of the proposed development. The detention pond(s) must be sized to capture the 100-year developed on-site runoff and release it at the 5-year historic undeveloped runoff rate (Sec 8-11-30#17). The current report uses the 25 year, 24 hour storm, this will need to be revised. • Hydraulic computations for onsite and offsite flows. The storm water system must be sized to safely handle the offsite flows that will flow through the site or it must be shown that no offsite flows enter the site. • The proposed grading will need to be provided with the Master Drainage Report. Please note that grading permits will be required for the construction of the storm water system (channels, ponds, swales, etc), access roads, building sites, and any other activities that disturb more than one acre of ground. • If phased construction is proposed, the Master Drainage Report shall need to include a Master Drainage Plan for the site that addresses how it will provide the necessary construction—phase stormwater management to prevent offsite impacts by stormwater discharges. Page 1 of 3 C:\Users\kford W ppData\Local\Microsoft\Windows\Temporary Internet Files\Low\Content.I E5\073B N 12H\M I N F12-0001[1].docx • To protect public safety and prevent offsite damages, sufficient interim Best Management Practices (detention, erosion, and sediment control) will need to be designed, approved, and installed prior to commencement of construction. Grading Permit: Prior to recording the Final Plat, the applicant needs to submit a grading permit showing: proposed grading, erosion control placement, typical details for all BMPs to be utilized, and a Construction Stormwater permit from the Colorado Department of Public Health and Environment. The permit must be stamped by a registered professional engineer licensed in the State of Colorado. Please note that the grading permit will not be released until the applicant has signed the improvements agreement, posted collateral, and submitted the Final plat for recording. Improvements Agreement: Prior to recording the Final Plat, the applicant needs to enter into an Improvements and Road Maintenance Agreement for the onsite and offsite work to be done. The Improvements will include triggers for onsite and offsite roadway upgrades and auxiliary lanes. Collateral needs to be submitted to and accepted by the Weld County Board of County Commissioners prior to recording of the plat. Traffic Study: Weld County Public Works has received a Traffic Study for the Hickman Development prepared and stamped by Gene Coppola. After reviewing the submitted traffic study and visiting the project site I have prepared the following comments: An annual road inspection will be performed in the spring to establish the condition of CR 33 & CR 44 to determine if any road damage was caused by the operation of the facility. The applicant will be responsible excavate, repair, or patch any damage on the roadway to mitigate for heavy truck traffic created by the facility. The type and method of repair will be determined by the Department Public Works. If road damage is beyond repair, the applicant will pay their proportional share for the reconstruction to restore the road. Roadways Improvements may be triggered due to heavy truck traffic associated with the facility including turn lanes; the following is a list of the triggers for turn lanes: a. 25vph turning right into the facility during a peak hour. b. 10vph turning left into the facility during a peak hour. c. 50 vph turning right out of the facility during a peak hour. A stop sign will be required to be installed at the facility accesses onto CR 33 & CR 44. The access will have 60' radius to accommodate the larger trucks entering and exiting the site. No parking or staging of commercial vehicles on the county road is allowed. Use on-site parking area. The Colorado Department of Transportation (CDOT) has jurisdiction over all State highways. Please contact the Greeley office (970-350-2148 or 970-350-2163) to verify if any improvements will be required at the intersections of WCR 44 & US-85 and WCR 33 & US-85 to accommodate traffic from the project site. The development has 3 approved existing access points onto WCR 33 and 1 access point on WCR 44 that is conditional upon the completion of the land swap for the Peckham Grader Shed through permit number AP12- 00008. The applicant is proposing approximately 260 trips per day in Phase 1 of the development and up to 5,026 at full build out. The interior roadway to the development is proposed as a gravel roadway. Due to the undetermined timeframe for the increased traffic volumes the following is a list of triggers for the improvements for the upgrading, widening, and paving of WCR 33 from the facility to US-85 and the interior roadway: a. 200 vehicles per day Mag-Chloride b. 400 vehicles per day Pavement Page 2 of 3 C:\Users\kfordWppData\Local\Microsoft\Windows\Temporary Internet Files\L ow\Content.I E5\073B N 12H\M I N F12-0001[1].docx CR 33 is a local gravel road and requires a 60-foot right-of-way at full build out. There is presently a 60-foot right-of-way. This road is maintained by Weld County. Pursuant to the definition of SETBACK in the Weld County Zoning (23-1-90), the required setback is measured from the future right-of-way line. CR 44 is an arterial road, which requires a 140-foot right-of-way at full build out. There is presently a 60-foot right-of-way. This road is maintained by Weld County. Pursuant to the definition of SETBACK in the Weld County Zoning (23-1-90), the required setback is measured from the future right-of-way line. Public Works will have additional comments with the submittal of a revised drainage report and construction plans. Page 3 of 3 C:\Users\kford W ppData\Local\Microsoft\Windows\Temporary Internet Files\Low\Content.I E5\073B N 12H\M I N F12-0001[1].docx Case Name: Case Number: Date: Weld County Public Works Final Plat Drainage Report Outline The following checklist is to be utilized as guidance, and may not be all inclusive. Other concerns not included in this checklist may arise during the review process. NOTE: A HARDCOPY OF THE DRAINAGE REPORT AND CONSTRUCTION DRAWINGS MUST BE SUBMITTED TO PUBLIC WORKS FOR REVIEW Not Comment Headings Included Included N/A All reports shall be typed on 8-1/2" x 11" paper and bound. Drawings (24" x 36") shall be included. The drawings shall be bound within the report or included within a pocket attached inside the back cover of the report. The report shall be a stand-alone document and therefore all important reference material, supporting documents, and calculations shall be copied and included within the report appendix. The report shall include a cover letter presenting the drainage design for review and shall be prepared or supervised by an engineer licensed in Colorado. Only original documents sealed in ink will be accepted. The sealed report shall contain a certification sheet as follows: "I hereby certify that this report for the final drainage design of(Insert Name of Project)was prepared by me (or under my direct supervision) in accordance with the provisions of the Weld County storm drainage criteria for the owners thereof." The Drainage Report is stamped, signed, and dated by a registered P.E. licensed to practice in the State of Colorado. All submitted construction plan sheets are stamped, signed, and dated by a registered P.E. licensed to practice in the State of Colorado. The following items at a minimum should be discussed in the Drainage Report narrative and should be supported with maps and calculations in the Appendix. Include a copy of this checklist with the Drainage Report submittal. I. General Location and Description A. Location 1. Township, Range, Section, ' -Section. 2. Local streets within and adjacent to the development. 3 Major open channels, lakes, streams, irrigation and other water resource facilities within and adjacent to project site. 4 Names of surrounding developments including jurisdiction (municipalities). B. Description of Property 1. Area in acres. 2. Ground cover and soil types. 3. Major open channels and property ownership. 4. General project description. 5 Existing irrigation facilities and facility ownership information within 200 ft. of property. Page 1 of 5 C:\Users\kford\NppData\Local\Microsoft\Windows\Temporary Internet Files\Low\Content.)E5\32TCU E N I\Final_Plat_Drainage_Report_Checklist[1].docx Case Name: Case Number: Date: 6. Groundwater characteristics (where applicable). II. Drainage Basins and Sub-Basins A. Major Basin Description 1. Reference to Weld County Master Drainage Plan(s)where applicable. 2. Major basin drainage characteristics. 3 Identification of all FEMA-defined 100-year floodplains and floodways affecting the property. On-site & offsite contours at minimum 2-ft vertical intervals are to be included on the Drainage Report drawings. B. Sub-Basin Description 1 Historic drainage patterns on the subject property and adjacent properties. Off-site drainage flow patterns and impacts on the subject property 2. (minimum 200 ft outside property boundary, or until no further off-site contributing flow area is encountered). III. Drainage Design Criteria A. Regulations 1 Discussion of the optional criteria selected or the deviation from the Weld County Storm Drainage Criteria, if any. B. Development Criteria Reference and Constraints Discussion of previous drainage studies (i.e. project master plans)for the 1. subject property that influence or are influenced by the drainage design for the site. Discussion of site constraints such as slopes, streets, utilities, existing 2. structures, irrigation ditches, and the site plan impacts on the drainage plan. C. Hydrological Criteria 1 Identify design rainfall amounts and source of design storm depth information, NOAA Atlas, UD&FCD maps, etc. 2 Identify design storm recurrence intervals. Reference the appropriate information in the Appendix. Identify runoff calculation method(s)and any computer models. Include 3 summaries of the routing and accumulation of flows at all identified design points for minor and major storm runoff. Reference the results in the Appendix. 4 Identify detention discharge and storage calculation methods and computer models. Reference the results in the Appendix. Discussion and justification of other criteria or calculation methods used 5. that are not presented or referenced by the Weld County Storm Drainage Criteria. D. Hydraulic Criteria 1 Identify conveyance capacities from County references and any computer models. Page 2 of 5 C:\Users\kford\NppData\Local\Microsoft\Windows\Temporary Internet Files\Low\Content.l E5\32TCU E N I\Final_Plat_Drainage_Report_Checklist[1].docx Case Name: Case Number: Date: Identify detention outlet type. Include a summary of the 100-year water surface elevation, spillway/overflow facility. Reference the appendix for 2 the calculations. Include summaries of the detention storage sizing and provide a stage-storage table/curve identifying water quality storage, 100- yr detention pond storage, and 1 ft of freeboard. Reference the calculations in the Appendix. 3. Identify check/drop structures criteria used. 4 Identify water quality outlet configuration. Reference the calculations in the Appendix. 5 Identify culverts including diameter, type, and slope. Reference the calculations in the Appendix. 6 Identify storm sewer inlets, manholes, etc. Reference the calculations in the Appendix. 7. Discussion of permanent erosion control features. Discussion and justification of criteria or calculation methods (for water 8. quality, check dams, drop structures, rundowns, etc.) used that are not presented in Weld County CODE. IV. Drainage Facility Design A. General Concept 1. Discussion of concept and typical historical drainage patterns. 2 Discussion of compliance with off-site runoff considerations and constraints. 3 Discussion of the content of all tables, charts,figures, or drawings in the report. 4 Discussion of anticipated hydraulic structures (channels, pipes, rundowns, etc.). B. Specific Details 1 Discussion of compliance with drainage criteria (street, inlet, pipe capacities, etc.) 2 Discussion of drainage problems encountered and solutions at specific design points. 3. Discussion of detention storage and outlet design. Discussion of maintenance access and aspects of the design. Provide 4 operations and maintenance instructions for the proposed stormwater drainage facilities. 2 Provide copies of CDPHE, CAFO, DRMS, or State Engineer's permit applications where applicable. V. Conclusions A. Compliance with the Weld County CODE 1. Statement of whether or not the design will meet Weld County Code. B. Drainage concept 1. Effectiveness of drainage design to control damage from storm runoff. Influence of proposed development on any applicable Weld County 2. Master Drainage Plan recommendations. Page 3 of 5 C:\Users\kford\NppData\Local\Microsoft\Windows\Temporary Internet Files\Low\Content.l E5\32TCU E N I\Final_Plat_Drainage_Report_Checklist[1].docx Case Name: Case Number: Date: Identification of and intent to obtain written approval of affected irrigation 3 company or other property owner(s). Weld County may require that the applicant provide evidence that offsite impacted jurisdictions have been notified of the proposed plans. 4 Reference all criteria and technical resources utilized. The Appendices should include at a minimum the following information. The Drainage Report should be a standalone document and needs to include copies of all pertinent references used in the generation of the Drainage Report. VI. Appendices A. Hydrologic Computations 1 Vicinity Map showing location of the site in relation to surrounding area. Show the approximate boundaries of the site. 2 FIRMette showing location of the site in relation to the FEMA mapped floodplains/floodways. Show the approximate boundaries of the site. 3 Soil Survey Information/Map showing soil types and soil hydrologic groups for the project site. 4 Rainfall Maps with the project location identified. Maps can be from UDFCD or NOAA as applicable. 5. Land use assumptions regarding adjacent properties. 6. Initial and major storm runoff computations at specific design points. (5- yr, 10-yr, and 100-yr) 7. Historic and fully developed runoff computations at specific design points. 8. Computer model input and output. Include model files and/or spreadsheets on a CD-ROM to be attached to the Drainage Report. B. Hydraulic Computations Culvert sizing. Provide computations showing slope, pipe size, material, 1. invert elevations, 100-year energy grade line (EGL100), and hydraulic profile. 2 Storm sewer and storm inlet sizing. Include the street capacity evaluations. 3 Swale or channel sizing. The calculations need to show stability calculations for unvegetated and vegetated conditions. 4 Riprap or other revetment design. The calculations need to include design for bedding and geo-fabric. 5 Pond area/volume capacity and outlet sizing. Show calculations for the 100-year water surface elevations and overflow facilities. 6. Check dam and/or drop structure sizing. Changes to calculation methods. If applicant/design engineer modifies any portion of the UDFCD spreadsheets used for hydrologic or hydraulic 7. calculations,the applicant/design engineer shall identify all changes to calculation assumptions or computer programs as to the type of change and specific factors that were modified. 8. Any computer model input and output. Include model files and/or spreadsheets on a CD-ROM to be attached to the Drainage Report. C. 24 x 36 Maps Drainage Plan of the proposed development shall be provided at a scale 1. of 1"=100' or 1"=200' on a 24"x36" drawing. The plan shall show the following information: Page 4 of 5 C:\Users\kford\NppData\Local\Microsoft\Windows\Temporary Internet Files\Low\Content.l E5\32TCU E N I\Final_Plat_Drainage_Report_Checklist[1].docx Case Name: Case Number: Date: Existing contours at a 2-ft maximum interval. Contours must extend at least 200 feet from all project boundaries or further if necessary to show la. upstream and downstream drainage relationships that impact the proposed development. The plans and report shall describe the horizontal and vertical datum (NGVD-29, NAVD-88, NAD83, etc) used on the plans and reconcile the differences where necessary. lb. Property lines, existing and proposed lot lines, and existing and proposed easements. lc. Streets with names. 1d. Existing drainage facilities, pipes, structures, irrigation facilities, and sizes. le. Overall drainage area boundary and sub-area boundaries. lf. Proposed contours and flow directions using arrows. Location of proposed storm sewers, swales, open channels, culverts, 1g' detention ponds, and other appurtenances. Proposed outfall point(s)for runoff from the development area and lh. facilities to convey flows to the final outfall point without damage to downstream properties. 1i Locations and elevations of all defined 100-year floodplains and . floodways affecting the property. 1j. Location and types of proposed permanent erosion control features. Historic Drainage Basin Map. Show drainage basin boundaries (on-site 2. and off-site), 2 ft on-site and off-site drainage boundaries, design points, historic flow path,flow path length, and flow path slope. Fully Developed Drainage Basin Map. Show drainage basin boundaries (on-site and off-site), 2 ft on-site and off-site drainage boundaries, design 3 points, developed flow path, flow path length, and flow path slope. Show drainage easement including metes and bounds description around all drainage related features. Show any other drainage easements that may exist on the project site. Full set of construction drawings that have been stamped, signed, and 4. dated by a registered Professional Engineer licensed in the State of Colorado. Page 5 of 5 C:\Users\kford\NppData\Local\Microsoft\Windows\Temporary Internet Files\Low\Content.)E5\32TCU E N I\Final_Plat_Drainage_Report_Checklist[1].docx Memorandum TO: Tom Parko,W.C. Planning T r ; DATE: September 11,2012 FROM: Lauren Light,W.C. Department of Public Heath and Environment CASE NO.: MINF12-0001 NAME:Big Thompson Investment Holdings LLC The Weld County Health Department has reviewed thisfinal plat application fora 9 lot industrial zoned minor subdivision on 94.6 acres. The minimum lot size of 5 acres coupled with an overall density of one septic system per 10.5 acres does meet current Department policy.The application was previously reviewed under case number COZ11-0001 in 2011. Water The application has satisfied Chapter 24 of the Weld County Code in regard to water service. Water will be provided by Central Weld County Water District and a referral dated 8/2912012 has been received fromthe District which indicated no conflicts with their interests. The Division of Water Resources returned a referral on 8/8/12 which states: Based on the above,and pursuant to Section 30-28-136(tj(h)(II).C.R.S.,it is our opinion that Me proposed water supply can to proveded vddwut causing material injure to deaeed water rights, and is adequate. It yw cc the applicant has any questions regarding this matter,p ease contact Sarah Brucker of the office Ewa Sewer will be provided by individual sewage disposal systems. A review of the site soil evaluation report from Soilogic, Inc., dated October 24,2011, indicatesthat the site consists of low to moderately plastic sandy loam. Individual percolation tests are required for each lot when septic permits are applied for. Engineer designed septic systems which are approved by the Board of Health will be required for each industrial site. A septic permit(SP-1200173)fora water depot has been approved by the Board of Health and issued by this Department. 1 Dep rtrrem of PlannirgSenvicw 1555 N 17G Ave Greeley,CO 80631 (970)353-6100 September 27,2012 Building Department Review Comments MINF12-0001 FINAL PLAT FOR A NINE(9)LOT MINOR SUBDIVISION(NINE(-3(INDUSTRIAL)ZONE DISTRICT(HICKMAN SUBDVVISION). Panel:1DS7272DDD66 DearSir/Madam, The Weld County Building Department has reviewed the history and investgated any complaint or violations that accompanythe parcelthe establishment resides on.The findings are as followed: There are airrently no building or eatingviolations or complaints on this parcel. Buildingpennits and engineered plans are required for new structures. Any owner or authorized agent who intends to construct,enlarge,alter,repair,move,demolish,or change the ocanpan)/of a building or structure,orto erect,install,enlarge,alter,repair,remove, convert or replace any electrical,gas,mechanical or plumbing system,or to muse any such work to be done,s hall first make application to the building official and Weld Countyto obtain the required permit. Forfurther information or comment please contact the Weld County Building Department. Sincerely, - _h Jonathan Gesidc Plana Examiner and Building Inspector 970-353-6100x-3532 rocst$C ` DEPARTME\TOF NATURAL RESOCKES y`�� i DIVISION OF WATER RESOURCES i fr*,�*f SoI.1 w,HrvtpAXpt,•r .+ g 97 6 r Ganrnlrr Mike Kin. Cxacati coimrbr September 14, 2012 nick wniw.r.I. UIr3Nl Tom Parko Weld County Planring Services Transmission via email: toarko(Tco.weld.co.us RE: Hickman Subdivision, Blg Thompson Investment Holdings, LLC Case No. MINF12.0001 Final Plat See. 23, UN, RBGW, 6'r P.M. • Water Division 1, Watcr Disbict2 Dear Mr. Perko: The proposal seeks to finalize a plat of a 9-lot minor subdivision on 94.6 acres. The lots would each be at least 5 acres In size. Water Supply Demand According toa letter dated August 6. 2012 from AgProfessionats LLC. the anticipated water demand for the subdivision et full build-out is 68 acre-feet par year. Source of Water Supply The proposed water source is the Central Weld County Water(District). On October 24, 2011. the District provided a letter noting that water service can be made available provided all requirements of the District. Northern Colorado Water Conservancy District and the Bureau of Reclamation are satisfied. We do not know if the applicant has met :here other requirements. The District notes that raw water must be prcvlded for subdivisions requiring 10 or more taps. At nine taps, it seems the aoplicanl will not be required to provide raw water. The District provided infomtation about their water supplies. They primarily rely on Colorado-Sig Thompson (C-BT)water to supply retail water customers. The District owns 5,370 C-BT units. The yield of C-BT units varies from year to year based on conditions and stows. The dry year quota applied for District firm yield planning Is 0.6, resulting in a water yield of 3:222 acre-feet per year. In most years, the Districts water yield greatly exceeds the firm yield. In addition, the District continues to develop additional water supplies ircluding partiopsting in the Nerthem Integrated Supply Project (NISP). Water demands forthe District's retell consumers have been around 3;000 acre-feet per year for the last few years. This development would increase average demand to about 3,066 acre-feet per year. Although, average water demand exceeds the firm yield water Supply of the District, the District has adopted a Water Shortage Contingency Plan (Plan) to reduce demand In dry years or under system emergency conditions. For instance, the District initiates Stage 1 of the Plan tinder various circumstances. including when the C-BT quota is less than 0.7. When Stage 1 19 triggered, voluntary reductiors in water usage are expected to reduce demand by 10 percent. This would correspond to a water supply of 3,759 acre-feel and a water demand of spout 3.510 acre-feet. The Plan goes on to greater stages of conservation including mandatory Office of thr Sot:: hntlneee 1313 Sherman Sueet Suite 818•t ei veo,CO S'aNF• 9hpnrc, I- M9i51 . I'ax30.1336E-3589 wwm,AiUr.nsie.m.i + Hickman Subdivision Final Plat Page 2 September 14,2012 water use restrictions intended to reduce demand by 30 percent or more. Therefore,with the addition of water demand for the Hickman Subdiv'sion,the District has an adopted approach to maintain demand levels below the level of water supply availaale from year to year. State Engineer's Office Opinion Based upon the above and pursuant to Section 30.26.136(1)(h)(ll).C.R.S.,the Stale Engineer's office offers the cpinion that wit the District as the water suppler for the development,the propcsed water supply can be provided without causing material injury to existing water rights and the supply is exacted to be adequate. If you orthe applicant has any questions regarding this matter,please contact Tracy Kosloff of this office. Sincerely, oann Williams,RE. esource Engineer JW,tik Hello