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Home My WebLink About20072883.tiff RESOLUTION OF THE WELD COUNTY PLANNING COMMISSION Moved by Bruce Fitzgerald that the following resolution be introduced for passage by the Weld County Planning Commission. Be it resolved by the Weld County Planning Commission that the application for: CASE NUMBER: USR-1582 APPLICANT: City of Aurora PLANNER: Jacqueline Hatch LEGAL DESCRIPTION: N2 SW4; S2 SW4; part SE4 of Section 13, Ti N, R67W of the 6th P.M., Weld County, Colorado and Lot B of RE-1231, part N2 NW4; Lot A of RE-1231 part NW4 NW4 of Section 24, T1 N, R67W of the 6th P.M., Weld County, Colorado. REQUEST: Site Specific Development Plan and Special Review Permit for a Major Facility of a Public Utility(Water Resource Project-Aquifer, Recharge and Recovery) in the A(Agricultural) Zone District. LOCATION: North and south of CR 8 and east of and adjacent to CR 23. be recommended favorably to the Board of County Commissioners for the following reasons: 1. The submitted materials are in compliance with the application requirements of Section 23-2-260 of the Weld County Code. 2. It is the opinion of the Department of Planning Services'staff that the applicant has shown compliance with Section 23-2-400 of the Weld County Code as follows: A. Section 23-2-400.A.-- Reasonable efforts have been made to avoid irrigated crop land or to minimize the impacts on such lands in those cases where avoidance is impractical. The subject site is designated Prime and Other Farmlands by the USDA Soil Conservation Services. The proposed use of the property is compatible with agricultural uses. B. Section 23-2-400.B. -- The facility will not have an undue adverse effect on existing and future development of the surrounding area as set forth in applicable Master Plans. The subject property lies within the three-mile referral area of the Cities of Brighton and Fort Lupton. The City of Brighton in their referral dated October 31,2006 mention two items. The first item being future dedication of road right-of-way for County Road 2 and the second being that any work within the City limits is subject to approval by the City and must comply with all City regulations. This Use by Special Review is for the water storage facility only and does not include the pipe line. The applicant is required as a Condition of Approval to address the concerns/requirements of the City of Brighton prior to recording the plat. The City of Fort Lupton in their referral dated October 26, 2006 state that while the project does not conflicts with the City's comprehensive plan the City has filed an objection in Water District Court concerning impacts to future wells and down stream contamination. C. Section 23-2-400.C.--The design of the proposed facility mitigates negative impacts on the surrounding area to the greatest extent feasible. The proposed facility will be compatible with surrounding land uses. While there are predominantly agricultural uses in the area, Riverbend Gravel Pit AMUSR-1259 is proposed on the surrounding land. USR-1243 for gravel mining is located on the property and will need to be vacated prior to recording the plat. The proposed Conditions of Approval and Development Standards will minimize negative impacts on the surrounding area. D. Section 23-2-400.D. -- The site shall be maintained in such a manner so as to control soil erosion, dust, and the growth of noxious weeds. The Conditions of Approval and Development Standards will ensure that there is no fugitive dust, erosion and will ensure the control of noxious weeds. Section 23-2-400.E. -- The applicant has agreed to implement any reasonable measures deemed necessary by the Planning Commission to ensure that the health,safety and welfare 2007-2883 /91_ /9as Resolution USR-1582 City of Aurora Page 2 E. of the inhabitants of the County will be protected, and to mitigate or minimize any potential adverse impacts from the proposed facility. F. Section 23-2-400.F. — The proposed facility will be supplied by an adequate water supply which has been evaluated with reference to the impacts of the use of such supply on agricultural uses. All reasonable steps have been taken by the applicant to minimize negative impacts on agricultural uses and lands. The source of the water for the project is the water rights already owned by the City of Aurora that will be diverted from the South Platte River through a series of alluvial wells. The water will then be piped to isolated Aquifer Recharge and Recovery(ARR)sites. This application is for the ARR sites. All reasonable steps have been taken by the applicant to minimize negative impacts on agricultural uses and lands. The City of Aurora has already filed such an application in water court(06CW104). The water court may not approve the Prairie Waters Project operational plan unless Aurora proves that its plan will not cause injury to other vested water rights owners. The site includes a caretaker that will reside on site and four part time employees on a daily basis. The applicant has applied for a commercial well. Evidence of a commercial well is required to be submitted as a Condition of Approval prior to recording the mylar. The Conditions of Approval and Development Standards minimize negative impacts on the existing agricultural uses and lands of the area. G. Section 23-2-400.G. -- 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 proposed facility will service the residents of the City of Aurora. H. Section 23-2-400.H. -- This application will create limited, if any, demand for additional government services. Section 23-2-400.1.—It has been determined that the nature and location or expansion of the facility will meet Colorado Department of Health and County air quality standards. The Conditions of Approval and Development Standards will ensure that the nature and location of the facility will meet Colorado Department of Health and Weld County air quality standards. J. Section 23-2-400.J. —Adequate electric, gas, telephone, water, sewage and other utilities exist or can be developed to service the site. The site is proposed to be serviced by Individual Sewage Disposal Systems and wells. K. Section 23-2-400.K. -- The nature and location or expansion of the facility will not unreasonably interfere with any significant wildlife habitat and will not unreasonably affect any endangered wildlife species, unique natural resource,historic landmark or archaeological site within the affected area. The Division of Wildlife did not respond to the referral request. L. Section 23-2-400.L. — The applicant's engineer has certified that the drainage plans developed for and to be implemented on the site will prevent surface drainage from leaving the site which would exceed historic runoff flows. The property is located within the floodplain. As a Condition of Approval the applicant will be required to submit evidence that a Flood Hazard Permit has been approved prior to recording the mylar. M. Section 23-2-400.M—The proposed use has no associated housing requirements. N. Section 23-2-400.N — The proposed site does not lie within a Municipality/County IGA boundary. Resolution USR-1582 City of Aurora Page 3 This recommendation is based, in part, upon a review of the application materials submitted by the applicant, other relevant information regarding the request, and responses from referral entities. The Department of Planning Services'staff recommendation for approval is conditional upon the following: 1. Prior to recording the plat: A. The applicant shall either submit a copy of an agreement with the property's mineral owner/operators stipulating that the oil and gas activities have been adequately incorporated into the design of the site or show evidence that an adequate attempt has been made to mitigate the concerns of the mineral owner/operators. Drill envelopes can be delineated on the plat in accordance with the State requirements as an attempt to mitigate concerns. The plat shall be amended to include any possible future drilling sites. (Department of Planning Services) B. The applicant shall submit written evidence to the Department of Planning Services from the Department of Public Works that a Flood Hazard Development Permit has been approved. (Department of Planning Services) C. The applicant shall vacate USR-1243 for a gravel operation. (Department of Planning Services) D. The applicant shall complete all proposed improvements including those regarding landscaping, screening, access improvements and parking lot requirements or enter into a Private Improvements Agreement according to policy regarding collateral for improvements and post adequate collateral for all landscaping,transportation (access drive,parking areas, etcetera) and non-transportation (plant materials, fencing, screening, water, signage etcetera). The agreement and form of collateral shall be reviewed by County Staff and accepted by the Board of County Commissioners prior to recording the Use by Special Review plat. Or the applicant may submit evidence that all the work has been completed and approved by the Department of Planning Services and the Department of Public Works. (Department of Planning Services) E. The applicant shall submit copies of finalized signed ditch agreements with Lupton Bottom Ditch and Brighton Ditch to the Department of Planning Services. (Department of Planning Services) F. The mobile home located on parcel number 1469 13 000043 permitted under ZPMH-491 as an accessory to the farm shall be removed from the property. Evidence shall be submitted to the Department of Planning Services. (Department of Planning Services) G. The applicant shall submit evidence to the Department of Planning Services, from the Colorado Division of Water Resources, demonstrating that the well(s) are appropriately permitted for the commercial use (Department of Planning Services and Department of Public Health andEnvironment) H. The applicant shall address the requirements (concerns) of State of Colorado Division of Water Resources, as stated in the referral response dated October 5, 2006. Evidence of such shall be submitted in writing to the Department of Planning Services. (Department of Planning Services) The applicant shall attempt to address the requirements(concerns)of the City of Fort Lupton, as stated in the referral response dated October 26, 2006. Evidence of such shall be Resolution USR-1582 City of Aurora Page 4 submitted in writing to the Department of Planning Services. (Department of Planning Services) J. The applicant shall attempt to address the requirements(concerns)of the City of Fort Lupton Public Works Department, as stated in the referral response dated October 13, 2006. Evidence of such shall be submitted in writing to the Department of Planning Services. (Department of Planning Services) K. The applicant shall attempt to address the requirements(concerns)of the City of Brighton,as stated in the referral response dated October 31,2006. Evidence of such shall be submitted in writing to the Department of Planning Services. (Department of Planning Services) L. The applicant shall address the requirements(concerns)of the Weld County Department of Building Inspection, as stated in the referral response dated October 26,2006. Evidence of such shall be submitted in writing to the Department of Planning Services. (Department of Planning Services) M. The applicant shall attempt to address the requirements (concerns) of the West Adams Conservation District,as stated in the referral response dated October 12,2006. Evidence of such shall be submitted in writing to the Department of Planning Services. (Department of Planning Services) N. The applicant shall attempt to address the requirements(concerns)of the Colorado Historical Society, as stated in the referral response dated October 10, 2006. Evidence of such shall be submitted in writing to the Department of Planning Services. (Department of Planning Services) O. The applicant shall attempt to address the requirements(concerns)of the State of Colorado Department of Natural Resources,as stated in the referral response dated October 10,2006. Evidence of such shall be submitted in writing to the Department of Planning Services. (Department of Planning Services) P. The applicant shall address the requirements(concerns)of the Weld County Department of Public Works, as stated in the referral response dated October 28, 2006. Evidence of such shall be submitted in writing to the Department of Planning Services. (Department of Planning Services) Q. The applicant shall submit a dust abatement plan for review and approval, to the Environmental Health Services, Weld County Department of Public Health & Environment. Evidence of approval shall be submitted to the Department of Planning Services. (Department of Public Health and Environment) R. The septic system serving the caretakers residence shall be reviewed by a Colorado Registered Professional Engineer. The review shall consist of observation of the system and a technical review describing the systems ability to handle the proposed hydraulic load.The review shall be submitted to the Environmental Health Services Division of the Weld County Department of Public Health and Environment. In the event the system is found to be inadequately sized or constructed the system shall be brought into compliance with current Regulations. Evidence of approval shall be submitted to the Department of Planning Services. (Department of Public Health and Environment) S. The applicant shall submit evidence of an Above Ground Storage Tank permit from the Colorado Department of Labor and Employment (CDL&E), Oil Inspection Section for any above ground storage tanks located on the site. Alternately, the applicant can provide evidence from the (CDL&E), Oil Inspection Section that they are not subject to these Resolution USR-1582 City of Aurora Page 5 requirements. Evidence of approval shall be submitted to the Department of Planning Services. (Department of Public Health and Environment) T. The applicant shall submit a Spill Prevention, Containment and Countermeasure Plan for review and approval to the Environmental Health Services, Weld County Department of Public Health & Environment. Evidence of approval shall be submitted to the Department of Planning Services. (Department of Public Health and Environment) U. The applicant shall submit a waste handling plan,for approval, to the Environmental Health Services Division of the Weld County Department of Public Health&Environment. Evidence of approval shall be submitted to the Department of Planning Services.The plan shall include at a minimum, the following: 1) A list of wastes which are expected to be generated on site (this should include expected volumes and types of waste generated). 2) A list of the type and volume of chemicals expected to be stored on site. 3) The waste handler and facility where the waste will be disposed (including the facility name, address, and phone number). (Department of Public Health and Environment) W. The applicant shall submit two (2) paper copies of the plat for preliminary approval to the Weld County Department of Planning Services. (Department of Planning Services) X. The plat shall be amended to delineate the following: 1. All sheets of the plat shall be labeled USR-1582 (Department of Planning Services) 2. The attached Development Standards. (Department of Planning Services) 3. The applicant has not delineated any on-site sign(s). If any on-site sign(s) are desired, the signs shall adhere to Article 4 Division 2 of the Weld County Code. Further, the location of the sign, if applicable shall be delineated on the Landscape/Site Plat. All structures, including signs, on site must obtain the appropriate building permits.(Department of Planning Services) 4. The plat shall meet all the requirements of Section 23-2-380 of the Weld County Code. (Department of Planning Services) 5. County Road 23 is classified by the County as a collector road,which requires 80 feet of right-of-way at full build out.There is presently a 60-foot right-of-way. The plat shall delineate the existing right-of-way along with any additional future right-of-way required. The applicant shall verify the existing right-of-way and the documents creating the right-of-way. This road is maintained by Weld County(Department of Public Works) 6. County Road 8 is classified by the County as a local gravel road,which requires 60 feet of right-of-way at full build out.There is presently a 60-foot right-of-way. The plat shall delineate the existing right-of-way. The applicant shall verify the existing right-of-way and the documents creating the right-of-way. This road is maintained by Weld County (Department of Public Works) 7. County Road 2 is classified by the County as a major arterial road,which requires 140 feet of right-of-way at full build out.There is presently a 60-foot right-of-way. The plat shall delineate the existing right-of-way along with any additional right-of-way Resolution USR-1582 City of Aurora Page 6 reservation required. The applicant shall verify the existing right-of-way and the documents creating the right-of-way. This road is maintained by Weld County (Department of Public Works) 8. The applicant shall remove the words"Lot 1 and Lot 2"from the plat. (Department of Planning Services) 2. One month prior to Construction: A. A stormwater discharge permit may be required for a development/redevelopment /construction site where a contiguous or non-contiguous land disturbance is greater than or equal to one acre in area. Contact the Water Quality Control Division of the Colorado Department of Public Health and the Environment at www.cdphe.state.co.us/wa/PermitsUnit for more information. (Department of Public Health and Environment) 3. Prior to operation: A. The applicant shall submit to the Department of Planning Services a copy of any well permit issued by the State Engineer following the procedures set forth in C.R.S.37-90-137. Pursuant to this section, before issuing the permit, the State Engineer must find that hydrological and geologic facts substantiate a finding that the proposed well will not materially injure the vested water rights of others. (Department of Planning Services) B. The applicant shall provide a monitoring and reporting plan for review and approval to the Weld County Department of Public Health and Environment. The intent of the plan should be to quantify accumulations of indicator parameters. At a minimum,the plan should include the routine sampling of the RCRA TCLP parameters, or other appropriate parameters, on an agreed upon frequency. Each report and data interpretation shall be provided the WCDPHE. 4. Upon completion of 1.above the applicant shall submit a Mylar plat along with all other documentation required as Conditions of Approval.The Mylar plat shall be recorded in the office of the Weld County Clerk and Recorder by Department of Planning Services' Staff. The plat shall be prepared in accordance with the requirements of Section 23-2-260.D of the Weld County Code. The Mylar plat and additional requirements shall be submitted within thirty(30)days from the date of the Board of County Commissioners resolution. The applicant shall be responsible for paying the recording fee. (Department of Planning Services) 5. The Department of Planning Services respectively requests the surveyor provide a digital copy of this Use by Special Review. Acceptable CAD formats are.dwg, .dxf,and .dgn(Microstation); acceptable GIS formats are ArcView shapefiles,Arclnfo Coverages and Arclnfo Export files format type is .e00. The preferred format for Images is .tif(Group 4). (Group 6 is not acceptable). This digital file may be sent to mapst@co.weld.co.us. (Department of Planning Services) 6. The Special Review activity shall not occur nor shall any building or electrical permits be issued on the property until the Special Review plat is ready to be recorded in the office of the Weld County Clerk and Recorder. (Department of Planning Services) 7. In accordance with Weld County Code Ordinance 2005-7 approved June 1,2005,should the plat not be recorded within the required sixty (30) days from the date the Board of County Commissioners resolution was signed a $50.00 recording continuance charge may be added for each additional 3 month period. (Department of Planning Services) SITE SPECIFIC DEVELOPMENT PLAN SPECIAL REVIEW PERMIT DEVELOPMENT STANDARDS City of Aurora—Prairie Waters Project USR-1582 1. A Site Specific Development Plan and a Special Review Permit for a Major Facility of a Public Utility (Water Resource Project—Aquifer, Recharge and Recovery) in the A(Agricultural)Zone District, as indicated in the application materials on file and subject to the Development Standards stated hereon. (Department of Planning Services) 2. Approval of this plan may create a vested property right pursuant to Section 23-8-10 of the Weld County Code. (Department of Planning Services) 3. Prior to entry of a water court decree, Aurora shall only operate the well[s] if it first receives an approved 37-92-308(4)substitute water supply plan from the State Engineer; provided,however that pursuant to State Engineer rules, Aurora may operate the wells for well testing purposes, if it immediately returns the test water to the river, without getting a substitute water supply plan. (Department of Planning Services) 4. Copies of the water court decree and all well permits issued shall be submitted to the Department of Planning Services. (Department of Planning Services) 5. The applicant shall submit building plans to the Fort Lupton Fire Protection District for review and approval prior to the issuance of building permits. A letter of approval shall be submitted to the Department of Building Inspection. (Department of Building Inspection) 6. All liquid and solid wastes (as defined in the Solid Wastes Disposal Sites and Facilities Act, 30-20-100.5, C.R.S., as amended) shall be stored and removed for final disposal in a manner that protects against surface and groundwater contamination. (Department of Public Health and Environment) 7. No permanent disposal of wastes shall be permitted at this site. This is not meant to include those wastes specifically excluded from the definition of a solid waste in the Solid Wastes Disposal Sites and Facilities Act, 30-20-100.5,C.R.S., as amended. (Department of Public Health and Environment) 8. Waste materials shall be handled, stored, and disposed in a manner that controls fugitive dust, fugitive particulate emissions, blowing debris,and other potential nuisance conditions. (Department of Public Health and Environment) 9. The applicant shall operate in accordance with the approved"waste handling plan". (Department of Public Health and Environment) 10. The applicant shall comply with all provisions of the Underground and Above Ground Storage Tank Regulations (7 CCR 1101-14). (Department of Public Health and Environment) 11. Fugitive dust and fugitive particulate emissions shall be controlled on this site. The facility shall be operated in accordance with the approved dust abatement plan at all times. (Department of Public Health and Environment) 12. This facility shall adhere to the maximum permissible noise levels allowed in the Commercial Zone as delineated in 25-12-103 C.R.S., as amended. (Department of Public Health and Environment) 13. Adequate handwashing and toilet facilities shall be provided for employees and patrons of the facility. (Department of Public Health and Environment) 14. Sewage disposal for the facility shall be by septic system. Any septic system located on the property must comply with all provisions of the Weld County Code, pertaining to Individual Sewage Disposal Systems. (Department of Public Health and Environment) 15. A permanent, adequate water supply shall be provided for drinking and sanitary purposes. (Department of Public Health and Environment) 16. All potentially hazardous chemicals must be stored and handled in a safe manner in accordance with product labeling and in a manner that minimizes the release of hazardous air pollutants(HAP's)and volatile organic compounds (VOC's). (Department of Public Health and Environment) 17. If applicable,the applicant shall obtain a stormwater discharge permit from the Colorado Department of Public Health & Environment, Water Quality Control Division. (Department of Public Health and Environment) 18. The operation shall comply with all applicable rules and regulations of the State and Federal agencies and the Weld County Code. (Department of Public Health and Environment) 19. The access easement shall be graded and drained to provide an all-weather access. (Department of Public Works) 20. Should noxious weeds exist on the property or become established as a result of the proposed development the applicant/landowner shall be responsible for controlling the noxious weeds,pursuant to Chapter 15, Articles I and II of the Weld County Code. (Department of Public Works) 21. Additional Grading permits will be required before the aquifer construction begins. (Department of Building Inspection) 22. A plan review is required for each building requiring a permit. Plans will require the wet stamp of a Colorado registered architect or engineer. (Department of Building Inspection) 23. Buildings shall conform to the requirements of the codes adopted by Weld County at the time of permit application. (Department of Building Inspection) 24. Building permits shall be obtained prior to the construction of any building. (Department of Building Inspection) 25. A plan review is required for any additional building. Plans shall bear the wet stamp of a Colorado registered architect or engineer. (Department of Building Inspection) 26. Buildings shall conform to the requirements of the various codes adopted at the time of permit application. Currently,the following has been adopted by Weld County: 2003 International Building Code, 2003 International Mechanical Code, 2003 International Plumbing Code, 2002 National Electrical Code and Chapter 29 of the Weld County Code. (Department of Building Inspection) 27. Buildings may require an engineered foundation based on a site-specific geotechnical report or an open hole inspection preformed by a Colorado registered engineer. Engineered foundations shall be designed by a Colorado registered engineer. (Department of Building Inspection) 28. Fire resistance walls and opening,construction requirement, maximum building height and allowable areas will be reviewed at the plan review. Setback and offset distances shall be determined by the Weld County Code. (Department of Building Inspection) 29. Building heights shall be measured in accordance with 2003 International Building Code for the purpose of determining the maximum building size and height for various uses and types of construction and to determine compliance with the Bulk Requirements for Chapter 23 of the Weld County Code. Building height shall be measured in accordance with Chapter 23 of the Weld County Code in order to determine compliance with offset and setback requirements. When measuring buildings to determine offset and setback requirements, buildings are measured to the farthest projection from the building. Property lines shall be clearly identified. (Department of Building Inspection) 30. A Flood Hazard Development Permit shall be submitted for buildings constructed or moved, and grading in the 100-year flood plain. (Departments of Planning Services) 31. The property owner or operator shall be responsible for complying with the Design Standards of Section 23-2-240, Weld County Code. 32. The property owner or operator shall be responsible for complying with the Operation Standards of Section 23-2-250, Weld County Code. 33. Weld County Government Personnel shall be granted access onto the property at any reasonable time in order to ensure the activities carried out on the property comply with the Development Standards stated herein and all applicable Weld County regulations. 34. The Special Review area shall be limited to the plans shown hereon and governed by the foregoing standards and all applicable Weld County regulations. Substantial changes from the plans or Development Standards as shown or stated shall require the approval of an amendment of the Permit by the Weld County Board of County Commissioners before such changes from the plans or Development Standards are permitted. Any other changes shall be filed in the office of the Department of Planning Services. 35. The property owner or operator shall be responsible for complying with all of the foregoing Development Standards. Noncompliance with any of the foregoing Development Standards may be reason for revocation of the Permit by the Board of County Commissioners. Motion seconded by Doug Ochsner. VOTE: For Passage Against Passage Absent Chad Auer—Chair Doug Ochsner—Vice Chair Paul Branham Erich Ehrlich Bruce Fitzgerald Tom Holton Mark Lawley Roy Spitzer James Welch The Chair declares the resolution passed and orders that a certified copy be placed in the file of this case to serve as a permanent record of these proceedings. CERTIFICATION OF COPY I, Donita May, Recording Secretary for the Weld County Planning Commission, do hereby certify that the above and foregoing resolution is a true copy of the resolution of the Planning Commission of Weld County, Colorado, adopted on December 19, 2006. Dated the 19th day of December, 2006.jUSDonita J Secretary • .SUMMARY OF THE WELD COUNTY PLANNING COMMISSION MEETING Tuesday, December 19, 2006 A regular meeting of the Weld County Planning Commission was held in the Southwest Weld County Conference Room, 4209 CR 24.5, Longmont, Colorado. The meeting was called to order by Chair, Chad Auer, at 1:30 p.m. ROLL CALL ABSENT Chad Auer- Chair Doug Ochsner-Vice Chair Paul Branham Erich Ehrlich Bruce Fitzgerald Tom Holton Roy Spitzer James Welch Mark Lawley Also Present: Bruce Barker, Don Carroll,Jesse Hein,Trevor Jiricek,Char Davis, Pam Smith,Chris Gathman, Jacqueline Hatch, Donita May. The summary of the last regular meeting of the Weld County Planning Commission held on November 21, 2006, was approved as read. 1. CASE NUMBER: USR-1580 APPLICANT: Justin & Andrea Davis PLANNER: Chris Gathman LEGAL DESCRIPTION: Part SW4 of Section 32, T12N, R60W of the 6th P.M., Weld County, Colorado. REQUEST: A Site Specific Development Plan and Special Review Permit for a home business (manufacturing steel frames for steel washers) in the A(Agricultural) Zone District. LOCATION: East of and adjacent to CR 99 and approx. 3/4 mile south of CR 136. Chris Gathman, Department of Planning Services, said the applicant was unable to provide sufficient notification due to illness and requested a continuance to the January 2,2007 Planning Commission hearing. The Chair asked if there was anyone in the audience who wished to speak for or against this application. No one wished to speak. Doug Ochsner moved that Case USR-1580, be continued to the January 2, 2007 Planning Commission hearing date. Bruce Fitzgerald seconded the motion. Motion carried. 2. CASE NUMBER: CZ-1132 APPLICANT: Front Range Village LLC PLANNER: Jacqueline Hatch LEGAL DESCRIPTION: Part of the SE4 SE4 SW4 of Section 7, T3N, R66W of the 6th P.M., Weld County, Colorado. REQUEST: Change of Zone from R-5 (Mobile Home Residential)Zone District to C-3 (Business Commercial)Zone District. LOCATION: West of and adjacent to SH 85 and north of and adjacent to CR 34. 1 Jacqueline Hatch, Department of Planning, said Front Range Village LLC do Larry Carroll with the Carroll Group, had applied for a Change of Zone from the R-5 (Mobile Home Residential) Zone District to C-3 (Business Commercial)Zone District. The sign announcing the planning commission hearing was posted on December 4, 2006 by staff. The site is located west of and adjacent to State Highway 85 and north of and adjacent to CR 34. The surrounding property to the east and west is zoned agricultural. Union Pacific Railroad is located east of SH 85. The property to the south is located with the Town of Platteville and currently being farmed. The property to the north is zoned C-3 and is being utilized for commercial uses(Z-124 in 1976 and Z-76 in 1966). No letters had been received from surrounding property owners. The site is located within the Intergovernmental Agreement Area with the Town of Platteville and the three mile referral area of the Towns of Gilcrest and Milliken. The Town of Platteville originally noted on the Notice of Inquiry form dated April 13,2006 that Platteville desires to see the property developed through the Town. In a follow up letter dated July 3, 2006 it was the Town's desire for the property to develop through Weld County. The Town of Platteville in their referral dated November 20, 2006 stated they had no concerns with this application. The Towns of Gilcrest and Milliken in their referrals dated October 31, 2006 and October 23, 2006 state that the property was not located within their Planning Areas and or their Urban Growth Boundary and had no conflicts with this application. The site currently has four mobile homes,three RV's,one stick built home that is vacant, a few outbuildings and some derelict vehicles. Conditions of approval require that the existing improvements on site be removed from the site prior to recording the plat. A Site Plan Review application will be required for any commercial use that is proposed on the site. Items addressed through the Site Plan Review application include, but are not limited to, number of employees, building construction, signage,landscape treatment,drainage,parking,outside storage,loading service areas and environmental criteria. The Site Plan Review will further ensure compatibility with surrounding land uses. The site is currently utilizing Central Weld County Water District and Individual Sewage Disposal Systems. The existing septic systems on site will need to be properly abandoned The site is accessed from County Road 34 and the frontage road along the West side of State Highway 85. In the referral from the Colorado Department of Transportation (CDOT) dated October 23, 2006 states that the proximity of the frontage road to State Highway 85 is too close and increasing traffic to the frontage road proposes a safety risk. CDOT would rather see this frontage road go away completely, and access to the development come by way of County Road 34. The applicant is being required to submit evidence that all CDOT requirements and concerns will be addressed prior to recording the plat. Fourteen referral agencies reviewed this case, six referral agencies had no comments,five referral agencies included conditions that have been attempted to be addressed through the development standards and conditions of approval. No comments were received from the Weld County Sheriff's Office, Platte Valley Soil Conservation District, and the Central Weld County Water District. The Weld County Department of Planning Services was recommending this application be approved. Bruce Fitzgerald asked if the site plan review would be an administrative task. Ms. Hatch said that it would. Larry Carroll,the owner's agent, 132 North Fourth Av, Brighton, CO, said they currently held an active septic permit and were in the process of updating it; abandonment of all of the improvements may not ultimately happen as they wanted to use one of the existing mobile homes for a caretaker's residence. Chad Auer asked if this would require a change in language. Ms. Hatch said the applicant was allowed to keep one mobile home on the property for a caretaker in addition to the stick built building which could be utilized as office space. The Chair asked if there was anyone in the audience who wished to speak for or against this application. No one wished to speak. Public portion of the hearing was closed. 2 Pam Smith, Environmental Health Department, said page six, items twelve and eighteen were duplicates and asked that item eighteen be removed. Bruce Fitzgerald motioned to remove item eighteen from the Development Standards and Conditions of Approval. Roy Spitzer seconded. Motion carried. Paul Branham asked Ms. Hatch if page four, item 1A., needed to be amended to include the new language. Ms. Hatch replied it should be changed to reflect that"the applicant shall provide evidence to the Department of Planning Services that all mobiles homes, except one,the RV's,and vehicles on site have been removed." Paul Branham motioned to amend page four, item I.A. to the language Ms. Hatch provided. Bruce Fitzgerald seconded. Motion carried. Doug Ochsner asked Ms. Hatch for clarification on whether this application would go before the Board of County Commissioners. Ms. Hatch responded the Board of County Commissioners does not review SPR's, they are reviewed administratively. Roy Spitzer asked Pam Smith, Environmental Health Department, about the abandonment of existing septic systems and what was involved. Ms. Smith replied they did not know how many septic systems were presently on the site but she did not believe it had been an active mobile home park and that all septic systems needed to be properly abandoned. The applicants could attach the one home allowed to a new septic system. Ms. Smith referred to condition number nineteen which said that all septic systems located on the property shall be properly abandoned in accordance with Section 30-7-70. She said they could add language regarding whether the septic system stays, but she has not had a conversation with the applicant as to what the proposed plan is for the property. Doug Ochsner asked what her preferences were regarding the property. Ms.Smith said she preferred that all existing septic systems be abandoned and that a new system be installed for the mobile home and the stick built building, but it could be allowed to operate on the existing septic system if it were found to be operational. The Chair asked Mr. Carroll if he was in agreement with the Development Standards and Conditions of Approval. Mr. Carroll said he could not agree as he had not received a packet. The Chair outlined the two changes for Mr. Carroll. Mr. Carroll then agreed to the Development Standards and Conditions of Approval and said it was the owner's intent to put in a new system. Roy Spitzer moved that Case CZ-1132, be forwarded to the Board of County Commissioners along with the amendments to the Development Standards and Conditions of Approval with the Planning Commission's recommendation of approval. Tom Holton seconded the motion. The Chair asked the secretary to poll the members of the Planning Commission for their decision. Paul Branham, yes; Bruce Fitzgerald, yes; Tom Holton, yes; Mark Lawley, yes; Doug Ochsner, yes; Roy Spitzer, yes; James Welch, yes; Chad Auer, yes. Motion carried. 3. CASE NUMBER: USR-1585 APPLICANT: Union Pacific Railroad Company PLANNER: Jacqueline Hatch LEGAL DESCRIPTION: Part of E2 E2 SW4 of Section 7, T3N, R66W of the 6th P.M., Weld County, Colorado. REQUEST: Site Specific Development Plan and a Special Review Permit for a Use by Right, an accessory use, or a Use by Special Review in the Commercial or Industrial Zone District(Vehicle sales establishments) in the A (Agricultural)Zone District. 3 LOCATION: East of and adjacent to SH 85, approximately 1/4 mile north of CR 34. Jacqueline Hatch, Department of Planning Services,said Union Pacific Railroad Company c/o Gregg Larsen for Darrel and Christina Felton, ATM Auto Sales, have applied for a Site Specific Development Plan and a Special Review Permit for a Use by Right, an accessory use,or a Use by Special Review in the Commercial or Industrial Zone District (Vehicle Sales Establishment) in the A(Agricultural)Zone District. The sign announcing the planning commission hearing was posted on December 4, 2006 by staff. The site is located east of and adjacent to SH 85 and approximately 1/4 mile north of CR 34 located within railroad right-of-way. The surrounding properties to the north, west and east are agricultural in nature with few homes in close proximity. The property to the south is currently zoned C-3 and has an approved Site Plan Review,SPR-264, on-site for truck sales, parts and accessories. The Union Pacific Railroad runs along the eastern edge of the property. The applicant is proposing an on-site septic system and the water will be provided by an individual well(septic permit SP-9600314,commercial well permit 198105). The development standards and conditions of approval will ensure compatibility with adjacent properties. The site is currently in violation (VI-0600029)due to the operation of an auto sales yard without the necessary Weld County Land Use permit. This violation has not yet been presented to the Board of County Commissioners through the violation process. If this application is approved by the Board of County Commissioners the violation will be corrected. If this application is denied, the business and all outdoor storage shall be removed within 30 (thirty) days of denial or the violation case will be scheduled before the Board of County Commissioners to proceed though the Violation Hearing process accordingly. No letters have been received from surrounding property owners. The subject property is within the three-mile referral area for the Towns of Gilcrest, Milliken and Platteville. The Town of Gilcrest in their referral dated October 30,2006 states that the subject property is located outside their urban growth boundary and finds no conflicts with their interests. The Town of Platteville in their referral dated October 10, 2006 also indicated no conflicts with their interests. The Town of Milliken in their referral dated October 11,2006 state that the property is a very visible area and it should be landscaped appropriately to buffer visual impacts. The Department of Planning Services has determined that the Town's concerns have been addressed through the Conditions of Approval and Development Standards. Thirteen referral agencies reviewed this case, four referral agencies had no comments, seven referral agencies included conditions that have been attempted to be addressed through the Development Standards and Conditions of Approval. No comments were received from the Weld County Sheriff's Office and the Union Pacific Railroad The Weld County Department of Planning Services was recommending this application be approved. Bruce Fitzgerald asked how long the property had been used as a car lot. Ms. Hatch said she did not know but there was an existing SPR for the property that included the yellow building to the south and that this USR included the property to the north with the car sales lot. Tom Holton asked about a development standard in the application regarding signage, specifically the banners that were presently on site. Ms. Hatch replied the applicant would have to provide a detailed signage plan, specifically addressing the banners but would have to follow County signage requirements. Ms. Hatch then informed the Planning Commission that the applicant had not received a packet prior to this hearing. Darrell Felton,owner, 1105 CR 28, Platteville,CO,said this was the fourth business on this property;the third car lot on the property;was at this location three years before he knew he was in violation;and he had been at this location for four years. Bruce Fitzgerald inquired how long there had been commercial endeavors on the property. Mr.Felton replied 4 it had been a long time,that he had a deal with the railroad for a twenty year paid lease and he has been there four years. The Chair asked if there was anyone in the audience who wished to speak for or against this application. No one wished to speak. Public portion was closed. Doug Ochsner asked if there was anyone present representing the railroad. Mr. Felton said he was representing them. Mr.Ochsner said he would put the fault on the railroad and wished they had been present to explain why they had allowed this lease. Ms. Hatch said the railroad responded in support of the application and there was a lease agreement in the application but there was no communication beyond that. Bruce Barker, County Attorney, said the railroad, in the past, thought they were exempt from requiring their lessees to go through the planning process. The Chair asked the applicant if he was in agreement with the Development Standards and Conditions of Approval. It was noted, for the record, that the applicant had not had a chance to read and review the information as he not received a copy of the packet.The Chair called for a ten minute recess so the applicant, Mr. Felton, could consult with Ms. Hatch regarding his application. Meeting reconvened at 2:15 p.m. Mr. Felton said he would like to have the landscaping and screening requirement removed, and asked for more specific clarification regarding screening requirements. Ms. Hatch said page four, items 1A and 1B were what Mr. Felton was objecting to. Bruce Fitzgerald asked Mr. Felton what he was offering as a substitute to the screening requirement. Mr. Felton said they had a security fence but screening made no sense because if customers couldn't see the cars, they wouldn't buy them. Ms. Hatch said it was an effort at landscaping and screening, and suggested decorative rock in the display areas where water was not available, and some landscaping around the building. The Chair said this requirement was in the Code. Doug Ochsner asked Ms. Hatch if the applicant could provide a landscape plan,which staff could then approve or suggest changes to. Tom Holton asked if staff was requiring screening that would block the view of the applicant's vehicles. She replied that typically they would ask for screening on the north, south and east sides, but the railroad would not allow screening or solid fencing on the railroad line and Planning would not be asking for that in this situation. The Chair asked the applicant again if he agreed with the Development Standards and Conditions of Approval. Mr. Felton said that he was in agreement except for the landscaping plan and screening addressed earlier. The Chair reminded Mr. Felton that the Planning Commission was only making a recommendation today to the Board of County Commissioners, and that he would have further opportunity to present his objections when his case was heard by them. Bruce Fitzgerald moved that Case USR-1585,be forwarded to the Board of County Commissioners along with the Development Standards and Conditions of Approval with the Planning Commission's recommendation of approval. Tom Holton seconded the motion. The Chair asked the secretary to poll the members of the Planning Commission for their decision. Paul Branham, yes; Bruce Fitzgerald, yes; Tom Holton, yes; Mark Lawley, yes; Doug Ochsner, yes; Roy Spitzer, yes; James Welch, yes; Chad Auer, yes. Motion carried. Paul Branham left at 2:22 p.m. • 5 4. CASE NUMBER: USR-1582 APPLICANT: City of Aurora PLANNER: Jacqueline Hatch LEGAL DESCRIPTION: N2 SW4; S2 SW4; pad SE4 of Section 13, Ti N, R67W of the 6th P.M., Weld County, Colorado and Lot B of RE-1231, part N2 NW4; Lot A of RE-1231 part NW4 NW4 of Section 24, T1 N, R67W of the 6'h P.M., Weld County, Colorado. REQUEST: Site Specific Development Plan and Special Review Permit for a Major Facility of a Public Utility (Water Resource Project- Aquifer, Recharge and Recovery) in the A (Agricultural)Zone District. LOCATION: North and south of CR 8 and east of and adjacent to CR 23. The City of Aurora — Prairie Waters Project do Mark Pifher with the City of Aurora have applied for a Site Specific Development Plan and a Special Review Permit for a Major Facility of a Public Utility (Water Resource Project—Aquifer, Recharge and Recovery) in the A (Agricultural)Zone District. The sign announcing the planning commission hearing was posted on December 8, 2006 by staff. The site is located north and south of CR 8 and east of and adjacent to CR 23 and comprises of approximately 393 acres. The source of the water for the project is the water rights already owned by the City of Aurora that will be diverted from the South Platte River through a series of alluvial wells. The water will then be piped to isolated Aquifer Recharge and Recovery(ARR) sites. This application is just for the ARR sites. The City of Aurora has already filed such an application in water court(06CW104). The water court may not approve the Prairie Waters Project operational plan unless Aurora proves that its plan will not cause injury to other vested water rights owners. The site does include a caretaker that will reside on site and four part time employees on a daily basis. The applicant has applied for a commercial well. Evidence of a commercial well is required to be submitted as a Condition of Approval prior to recording the mylar. The surrounding properties are predominantly agricultural uses in the area. Riverbend Gravel Pit AMUSR- 1259 is proposed on the surrounding land. USR-1243 for gravel mining is located on the property and will need to be vacated prior to recording the plat. The proposed Conditions of Approval and Development Standards will minimize negative impacts on the surrounding area. No letters have been received from surrounding property owners. The subject property lies within the three-mile referral area of the Cities of Brighton and Fort Lupton. The City of Brighton in their referral dated October 31,2006 mentioned two items: the first item being future dedication of road right-of-way for County Road 2; and the second being that any work within the city limits is subject to approval by the city and must comply with all city regulations. This Use by Special Review is for the water storage facility only and does not include the pipe line. The applicant is required as a Condition of Approval to address the concerns/requirements of the City of Brighton prior to recording the plat. The City of Fort Lupton in their referral dated October 26, 2006 state that while the project does not conflicts with the city's comprehensive plan the city has filed an objection in Water District Court concerning impacts to future wells and down stream contamination. Prior to operation the applicant shall submit to the Department of Planning Services a copy of any well permit issued by the State Engineer following the procedures set forth in C.R.S.37-90-137. Pursuant to this section, before issuing the permit, the State Engineer must find that hydrological and geologic facts substantiate a finding that the proposed well will not materially injure the vested water rights of others. 6 And as development standards to be placed on the plat: #3-Prior to entry of a water court decree,Aurora shall only operate the well[s] if it first receives an approved 37-92-308(4)substitute water supply plan from the State Engineer; provided, however that pursuant to State Engineer rules,Aurora may operate the wells for well testing purposes, if it immediately returns the test water to the river, without getting a substitute water supply plan. #4 - Copies of the Water Court decree and all well permits issued shall be submitted to the Department of Planning Services. Twenty three referral agencies reviewed this case, four referral agencies had no comments, ten referral agencies included conditions that have been attempted to be addressed through the Development Standards and Conditions of Approval. This case is classified as major facility of a public utility and therefore does not get forwarded to the Board of County Commissioners for final determination per Section 23-2-300 of the Weld County Code. The Weld County Department of Planning Services was recommending that this application be approved. Roy Spitzer and Tom Holton recused themselves from the next case citing conflicts of interest. Chad Auer asked about any objections from referral agencies. Ms. Hatch replied here was one from Fort Lupton and the Health Department was asking for a new condition to be added prior to operation. Ms. Hatch then read the condition into the record. "The applicant shall provide a monitoring and reporting plan for review and approval to the Weld County Department of Public Health and Environment. The intent of the plan should be to quantify accumulations of indicator parameters. At a minimum, the plan should include the routine sampling of the RCRA TCLP parameters, or other appropriate parameters, on an agreed upon frequency. Each report and data interpretation shall be provided the WCDPHE." Mr.Auer then asked if it was added as item 3B., page 9, as prior to operation. Ms. Hatch said that was correct. Dana Ehlen,6835 East Edgewood Way, Highlands Ranch, CO, acting Director of Aurora Water,outlined the project: extremely important for the citizens of Aurora;have a good reputation for working with communities; project was critical due to drought of 2002; looked at fifty four alternatives but this was most expedient way to obtain water; project uses conservation water; described what the site would look like as the project progressed; sustainable, natural purification system; no impact on wetlands; worked with all regulatory agencies to ensure they have met all guidelines;and would complement the agricultural and rural nature of the area. Mark Pifher, 18825 St Andrews Dr, Monument CO, Deputy Director of Aurora Water, talked about project components;aquifer recharging area; advanced water treatment plant next to City of Aurora treatment plant; extends through three counties; multi-barrier approach to water purification; general site location; area will remain open space in nature; ponds will take up sixty three acres total; environmentally sound; wave of the future in western water development; found all Department of Planning Conditions to be acceptable. Mr. Ehlen stepped up to speak about various agency support for their project; designed as a drought relief project for Aurora; excess water would be made available for agricultural uses. Chad Auer asked about the objection from Fort Lupton regarding downstream contamination and adverse effects on future wells. Mr. Pifher responded that Water Court would monitor and impose conditions and they would certainly abide by those;they had retained a consulting firm to determine impacts on water quality and found none; no water quality standards would be violated. Doug Ochsner asked how much water this procedure could expect to process. Mr. Ehlen replied ten thousand acre feet by 2010 and twelve thousand acre feet by 2015. Mr. Ochsner asked if they had worked with the Lupton Bottom Ditch to gain their approval. Mr. Pifher said they had, and would work with them on ditch modification, if necessary, at their own expense. Ms. Hatch emphasized a Condition of Approval, page six, item E., which supported that. Chad Auer asked what was in this for Weld County. Mr. Pifher replied this would be a shared water conservancy and they would lease supplies at least for the short term. 7 The Chair asked if there was anyone in the audience who wished to speak for or against this application. No one wished to speak. Public portion closed. Bruce Fitzgerald said he liked the project and lived in close proximity. Doug Ochsner moved to add item 3.B., to page nine, per the December 19, 2006,WCDPHE memo. Bruce Fitzgerald seconded. Motion carried. The Chair asked the applicant's representative if they had read the Development Standards and Conditions of Approval. Mr. Ehlen said they had read the Development Standards and Conditions of Approval and were in agreement. Bruce Fitzgerald moved that Case USR-1582, be forwarded to the Board of County Commissioners along with the amended Development Standards and Conditions of Approval with the Planning Commission's recommendation of approval. Doug Ochsner seconded the motion. The Chair asked the secretary to poll the members of the Planning Commission for their decision. Erich Ehrlich,yes; Bruce Fitzgerald,yes; Mark Lawley,yes; Doug Ochsner,yes;James Welch,yes;Chad Auer,yes. Motion carried unanimously. Doug Ochsner said he supported the project one hundred percent, but was a bit uneasy passing this application without the approval of the Board of County Commissioners. Meeting adjourned at 3:00 p.m. Respectfully submitted, bt M Donita May Secretary 8 INVENTORY OF ITEMS FOR CONSIDERATION Applicant City of Aurora—Prairie Waters Project do Case Number USR-1582 Mark Pifher with the City of Aurora Submitted or Prepared Prior to At Hearing Hearing 1 Staff Comments X Department of Planning Services Field Check Form X Planning Commissioner Field Check Form Letter to Applicant X Affidavit of sign posting X Legal Notifications X 2 Application X Maps X Deed/Easement Certificate X Surrounding Property/Mineral Owners X Utilities X 3 Referral List X Referrals without comment X Weld County Department of Planning Services, Landscape, referral received X October 23,2006 Platte Valley Soil Conservation District, referral received October 2, 2006 X Weld County Zoning Compliance, referral received September 29, 2006 X Fort Lupton Fire Protection District, referral received October 2, 2006 X 4 Referrals with comments X City of Brighton, Planning, referral received October 31,2006 X City of Brighton, Public Works, referral received October 13,2006 X City of Fort Lupton, referral received October 26, 2006 X State of Colorado, Division of Water Resources, referral received October 5,2006 X Weld County Department of Building Inspection, referral received October 26,2006 X West Adams Soil Conservation District, referral received October 12,2006 X Colorado Historical Society, referral received October 10, 2006 X State of Colorado, Department of Natural Resources, referral received October 10, X 2006 Weld County Department of Public Works, referral received October 3,2006 X Weld County Department of Public Health and Environment, referral received X November 1,2006 5 PC Exhibits X 5.a Memorandum from Trevor Jiricek with the Department of Public Health and X Environment dated December 18, 2006 P� / le,q 5 5.b Memorandum from Jacqueline Hatch with the Department of Planning Services X dated December 19, 2006 6 Planning Commission Resolution X I hereby certify that the twenty eight items identified herein were submitted to the a artment of Planning Services. • Jacqueline Hat/ H Planner fttrig' WFi`PC. LAND USE APPLICATION COLORADO SUMMARY SHEET Case Number: USR-1582 Hearing Date: December 19, 2006 Applicant: City of Aurora—Prairie Waters Project do Mark Pifher with the City of Aurora Address: 15151 E. Alameda Parkway#3600, Aurora CO 80012 Request: A Site Specific Development Plan and a Special Review Permit for a Major Facility of a Public Utility (Water Resource Project — Aquifer, Recharge and Recovery) in the A (Agricultural)Zone District. Legal Description: N2 SW4; S2 SW4; Pt SE4 of Section 13, T1 N, R67W and Lot B RE-1231 Pt N2 NW4; Lot A RE-1231 Pt NW4 NW4 of Section 24, T1 N, R67W of the 6th P.M., Weld County, CO. Location: North and South of County Road 8 and east of and adjacent to County Road 23 Parcel ID #: 1469 13 000008; 1469 13 000042; 1469 13 000043; 1469 13 000011; 1469 24 000026 & 1469 24 000025 Size of Parcel: 393.24 +/-acres POSSIBLE ISSUES SUMMARIZED FROM APPLICATION MATERIALS The criteria for review of this Special Review Permit is listed in Section 23-2-220 of the Weld County Code. The Department of Planning Services' staff has received responses from the following agencies: • Weld County Zoning Compliance, referral received September 29, 2006 • Weld County Department of Public Health and Environment, referral received November 1, 2006 • Weld County Department of Public Works, referral received October 3, 2006 • Weld County Department of Planning Services, Landscape, referral received October 23, 2006 • West Adams Soil Conservation District, referral received October 12, 2006 • Platte Valley Soil Conservation District, referral received October 2, 2006 • City of Brighton, Planning, referral received October 31, 2006 • City of Brighton, Public Works, referral received October 13, 2006 • City of Fort Lupton, referral received October 26, 2006 • Fort Lupton Fire Protection District, referral received October 2, 2006 • Weld County Department of Building Inspection, referral received October 26, 2006 • State of Colorado, Department of Natural Resources, referral received October 10, 2006 • State of Colorado, Division of Water Resources, referral received October 5, 2006 • Colorado Historical Society, referral received October 10, 2006 USR-1582 City of Aurora— Prairie Waters Project Page 1 EXHIBIT The Department of Planning Services'staff has not received responses from the following agencies: • Weld County Sheriff's Office • Weld County Attorney • State of Colorado Division of Wildlife • State of Colorado Department of Public Health • State of Colorado Department of Transportation US Army Corps of Engineers • Big Dry Creek • Lupton Bottom Ditch • Adams County USR-1582 City of Aurora— Prairie Waters Project Page 2 #f$ V,;n4 SPECIAL REVIEW PERMIT ADMINISTRATIVE REVIEW COLORADO Planner: Jacqueline Hatch Case Number: USR-1582 Hearing Date: December 19, 2006 Applicant: City of Aurora — Prairie Waters Project do Mark Pifher with the City of Aurora Address: 15151 E. Alameda Parkway#3600, Aurora CO 80012 Request: A Site Specific Development Plan and a Special Review Permit for a Major Facility of a Public Utility (Water Resource Project — Aquifer, Recharge and Recovery) in the A (Agricultural)Zone District. Legal Description: N2 SW4; S2 SW4; Pt SE4 of Section 13, Ti N, R67W and Lot B RE-1231 Pt N2 NW4; Lot A RE-1231 Pt NW4 NW4 of Section 24, T1 N, R67W of the 6th P.M., Weld County, CO. Location: North and South of County Road 8 and east of and adjacent to County Road 23 Parcel ID #: 1469 13 000008; 1469 13 000042; 1469 13 000043; 1469 13 000011; 1469 24 000026 & 1469 24 000025 Size of Parcel: 393.24 +/- acres THE DEPARTMENT OF PLANNING SERVICES' STAFF RECOMMENDS THAT THIS REQUEST BE APPROVED FOR THE FOLLOWING REASONS: 1. The submitted materials are in compliance with the application requirements of Section 23-2-260 of the Weld County Code. 2. It is the opinion of the Department of Planning Services' staff that the applicant has shown compliance with Section 23-2-400 of the Weld County Code as follows: A. Section 23-2-400.A. -- Reasonable efforts have been made to avoid irrigated crop land or to minimize the impacts on such lands in those cases where avoidance is impractical. The subject site is designated Prime and Other Farmlands by the USDA Soil Conservation Services. The proposed use of the property is compatible with agricultural uses. B. Section 23-2-400.B. -- The facility will not have an undue adverse effect on existing and future development of the surrounding area as set forth in applicable Master Plans. The subject property lies within the three-mile referral area of the Cities of Brighton and Fort Lupton. The City of Brighton in their referral dated October 31, 2006 mention two items. USR-1582 City of Aurora— Prairie Waters Project Page 3 The first item being future dedication of road right-of-way for County Road 2 and the second being that any work within the City limits is subject to approval by the City and must comply with all City regulations. This Use by Special Review is for the water storage facility only and does not include the pipe line. The applicant is required as a Condition of Approval to address the concerns/requirements of the City of Brighton prior to recording the plat. The City of Fort Lupton in their referral dated October 26, 2006 state that while the project does not conflicts with the City's comprehensive plan the City has filed an objection in Water District Court concerning impacts to future wells and down stream contamination. C. Section 23-2-400.C. -- The design of the proposed facility mitigates negative impacts on the surrounding area to the greatest extent feasible. The proposed facility will be compatible with surrounding land uses. While there are predominantly agricultural uses in the area, Riverbend Gravel Pit AMUSR-1259 is proposed on the surrounding land. USR-1243 for gravel mining is located on the property and will need to be vacated prior to recording the plat. The proposed Conditions of Approval and Development Standards will minimize negative impacts on the surrounding area. D. Section 23-2-400.D. -- The site shall be maintained in such a manner so as to control soil erosion, dust, and the growth of noxious weeds. The Conditions of Approval and Development Standards will ensure that there is no fugitive dust, erosion and will ensure the control of noxious weeds. E. Section 23-2-400.E. -- The applicant has agreed to implement any reasonable measures deemed necessary by the Planning Commission 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 facility. F. Section 23-2-400.F. — The proposed facility will be supplied by an adequate water supply which has been evaluated with reference to the impacts of the use of such supply on agricultural uses. All reasonable steps have been taken by the applicant to minimize negative impacts on agricultural uses and lands. The source of the water for the project is the water rights already owned by the City of Aurora that will be diverted from the South Platte River through a series of alluvial wells. The water will then be piped to isolated Aquifer Recharge and Recovery (ARR) sites. This application is for the ARR sites. All reasonable steps have been taken by the applicant to minimize negative impacts on agricultural uses and lands. The City of Aurora has already filed such an application in water court (06CW104). The water court may not approve the Prairie Waters Project operational plan unless Aurora proves that its plan will not cause injury to other vested water rights owners. The site includes a caretaker that will reside on site and four part time employees on a daily basis. The applicant has applied for a commercial well. Evidence of a commercial well is required to be submitted as a Condition of Approval prior to recording the mylar. The Conditions of Approval and Development Standards minimize negative impacts on the existing agricultural uses and lands of the area. G. Section 23-2-400.G. --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 proposed facility will service the residents of the City of Aurora. H. Section 23-2-400.1-I. -- This application will create limited, if any, demand for additional government services. USR-1582 City of Aurora— Prairie Waters Project Page 4 Section 23-2-400.1. — It has been determined that the nature and location or expansion of the facility will meet Colorado Department of Health and County air quality standards. The Conditions of Approval and Development Standards will ensure that the nature and location of the facility will meet Colorado Department of Health and Weld County air quality standards. J. Section 23-2-400.J. —Adequate electric, gas, telephone, water, sewage and other utilities exist or can be developed to service the site. The site is proposed to be serviced by Individual Sewage Disposal Systems and wells. K. Section 23-2-400.K. -- The nature and location or expansion of the facility will not unreasonably interfere with any significant wildlife habitat and will not unreasonably affect any endangered wildlife species, unique natural resource, historic landmark or archaeological site within the affected area. The Division of Wildlife did not respond to the referral request. L. Section 23-2-400.L. — The applicant's engineer has certified that the drainage plans developed for and to be implemented on the site will prevent surface drainage from leaving the site which would exceed historic runoff flows. The property is located within the floodplain. As a Condition of Approval the applicant will be required to submit evidence that a Flood Hazard Permit has been approved prior to recording the mylar. M. Section 23-2-400.M—The proposed use has no associated housing requirements. N. Section 23-2-400.N — The proposed site does not lie within a Municipality/County IGA boundary. This recommendation is based, in part, upon a review of the application materials submitted by the applicant, other relevant information regarding the request, and responses from referral entities. The Department of Planning Services' staff recommendation for approval is conditional upon the following: 1. Prior to recording the plat: A. The applicant shall either submit a copy of an agreement with the property's mineral owner/operators stipulating that the oil and gas activities have been adequately incorporated into the design of the site or show evidence that an adequate attempt has been made to mitigate the concerns of the mineral owner/operators. Drill envelopes can be delineated on the plat in accordance with the State requirements as an attempt to mitigate concerns. The plat shall be amended to include any possible future drilling sites. (Department of Planning Services) B. The applicant shall submit written evidence to the Department of Planning Services from the Department of Public Works that a Flood Hazard Development Permit has been approved. (Department of Planning Services) C. The applicant shall vacate USR-1243 for a gravel operation. (Department of Planning Services) D. The applicant shall complete all proposed improvements including those regarding landscaping, screening, access improvements and parking lot requirements or enter into a Private Improvements Agreement according to policy regarding collateral for improvements and post adequate collateral for all landscaping, transportation (access USR-1582 City of Aurora— Prairie Waters Project Page 5 drive, parking areas, etcetera) and non-transportation (plant materials, fencing, screening, water, signage etcetera). The agreement and form of collateral shall be reviewed by County Staff and accepted by the Board of County Commissioners prior to recording the Use by Special Review plat. Or the applicant may submit evidence that all the work has been completed and approved by the Department of Planning Services and the Department of Public Works. (Department of Planning Services) E. The applicant shall submit copies of finalized signed ditch agreements with Lupton Bottom Ditch and Brighton Ditch to the Department of Planning Services. (Department of Planning Services) F. The mobile home located on parcel number 1469 13 000043 permitted under ZPMH-491 as an accessory to the farm shall be removed from the property. Evidence shall be submitted to the Department of Planning Services. (Department of Planning Services) G. The applicant shall submit evidence to the Department of Planning Services, from the Colorado Division of Water Resources, demonstrating that the well(s) are appropriately permitted for the commercial use (Department of Planning Services and Department of Public Health and Environment) H. The applicant shall address the requirements (concerns) of State of Colorado Division of Water Resources, as stated in the referral response dated October 5, 2006. Evidence of such shall be submitted in writing to the Department of Planning Services. (Department of Planning Services) The applicant shall attempt to address the requirements (concerns) of the City of Fort Lupton, as stated in the referral response dated October 26, 2006. Evidence of such shall be submitted in writing to the Department of Planning Services. (Department of Planning Services) J. The applicant shall attempt to address the requirements (concerns) of the City of Fort Lupton Public Works Department, as stated in the referral response dated October 13, 2006. Evidence of such shall be submitted in writing to the Department of Planning Services. (Department of Planning Services) K. The applicant shall attempt to address the requirements (concerns) of the City of Brighton, as stated in the referral response dated October 31, 2006. Evidence of such shall be submitted in writing to the Department of Planning Services. (Department of Planning Services) L. The applicant shall address the requirements (concerns) of the Weld County Department of Building Inspection, as stated in the referral response dated October 26, 2006. Evidence of such shall be submitted in writing to the Department of Planning Services. (Department of Planning Services) M. The applicant shall attempt to address the requirements (concerns) of the West Adams Conservation District, as stated in the referral response dated October 12, 2006. Evidence of such shall be submitted in writing to the Department of Planning Services. (Department of Planning Services) N. The applicant shall attempt to address the requirements (concerns) of the Colorado Historical Society, as stated in the referral response dated October 10, 2006. Evidence of such shall be submitted in writing to the Department of Planning Services. (Department of Planning Services) USR-1582 City of Aurora— Prairie Waters Project Page 6 O. The applicant shall attempt to address the requirements (concerns) of the State of Colorado Department of Natural Resources, as stated in the referral response dated October 10, 2006. Evidence of such shall be submitted in writing to the Department of Planning Services. (Department of Planning Services) P. The applicant shall address the requirements (concerns) of the Weld County Department of Public Works, as stated in the referral response dated October 28, 2006. Evidence of such shall be submitted in writing to the Department of Planning Services. (Department of Planning Services) Q. The applicant shall submit a dust abatement plan for review and approval, to the Environmental Health Services, Weld County Department of Public Health & Environment. Evidence of approval shall be submitted to the Department of Planning Services. (Department of Public Health and Environment) R. The septic system serving the caretakers residence shall be reviewed by a Colorado Registered Professional Engineer. The review shall consist of observation of the system and a technical review describing the systems ability to handle the proposed hydraulic load. The review shall be submitted to the Environmental Health Services Division of the Weld County Department of Public Health and Environment. In the event the system is found to be inadequately sized or constructed the system shall be brought into compliance with current Regulations. Evidence of approval shall be submitted to the Department of Planning Services. (Department of Public Health and Environment) S. The applicant shall submit evidence of an Above ground Storage Tank permit from the Colorado Department of Labor and Employment (CDL&E), Oil Inspection Section for any above ground storage tanks located on the site. Alternately, the applicant can provide evidence from the (CDL&E), Oil Inspection Section that they are not subject to these requirements. Evidence of approval shall be submitted to the Department of Planning Services. (Department of Public Health and Environment) T. The applicant shall submit a Spill Prevention, Containment and Countermeasure Plan for review and approval to the Environmental Health Services, Weld County Department of Public Health & Environment. Evidence of approval shall be submitted to the Department of Planning Services. (Department of Public Health and Environment) U. The applicant shall submit a waste handling plan, for approval, to the Environmental Health Services Division of the Weld County Department of Public Health & Environment. Evidence of approval shall be submitted to the Department of Planning Services. The plan shall include at a minimum, the following: 1) A list of wastes which are expected to be generated on site (this should include expected volumes and types of waste generated). 2) A list of the type and volume of chemicals expected to be stored on site. 3) The waste handler and facility where the waste will be disposed (including the facility name, address, and phone number). (Department of Public Health and Environment) W. The applicant shall submit two (2) paper copies of the plat for preliminary approval to the Weld County Department of Planning Services. (Department of Planning Services) USR-1582 City of Aurora— Prairie Waters Project Page 7 X. The plat shall be amended to delineate the following: 1. All sheets of the plat shall be labeled USR-1582 (Department of Planning Services) 2. The attached Development Standards. (Department of Planning Services) 3. The applicant has not delineated any on-site sign(s). If any on-site sign(s) are desired, the signs shall adhere to Article 4 Division 2 of the Weld County Code. Further, the location of the sign, if applicable shall be delineated on the Landscape / Site Plat. All structures, including signs, on site must obtain the appropriate building permits. (Department of Planning Services) 4. The plat shall meet all the requirements of Section 23-2-380 of the Weld County Code. (Department of Planning Services) 5. County Road 23 is classified by the County as a collector road, which requires 80 feet of right-of-way at full build out. There is presently a 60-foot right-of-way. The plat shall delineate the existing right-of-way along with any additional future right- of-way required. The applicant shall verify the existing right-of-way and the documents creating the right-of-way. This road is maintained by Weld County (Department of Public Works) 6. County Road 8 is classified by the County as a local gravel road, which requires 60 feet of right-of-way at full build out. There is presently a 60-foot right-of-way. The plat shall delineate the existing right-of-way. The applicant shall verify the existing right-of-way and the documents creating the right-of-way. This road is maintained by Weld County (Department of Public Works) 7. County Road 2 is classified by the County as a major arterial road, which requires 140 feet of right-of-way at full build out. There is presently a 60-foot right-of-way. The plat shall delineate the existing right-of-way along with any additional right-of-way reservation required. The applicant shall verify the existing right-of-way and the documents creating the right-of-way. This road is maintained by Weld County (Department of Public Works) 8. The applicant shall remove the words "Lot 1 and Lot 2" from the plat. (Department of Planning Services) 2. One month prior to Construction: A. A stormwater discharge permit may be required for a development/redevelopment /construction site where a contiguous or non-contiguous land disturbance is greater than or equal to one acre in area. Contact the Water Quality Control Division of the Colorado Department of Public Health and the Environment at www.cdphe.state.co.us/wq/PermitsUnit for more information. (Department of Public Health and Environment) 3. Prior to operation: A. The applicant shall submit to the Department of Planning Services a copy of any well permit issued by the State Engineer following the procedures set forth in C.R.S. 37-90- 137. Pursuant to this section, before issuing the permit, the State Engineer must find that USR-1582 City of Aurora— Prairie Waters Project Page 8 hydrological and geologic facts substantiate a finding that the proposed well will not materially injure the vested water rights of others. (Department of Planning Services) 4. Upon completion of 1. above the applicant shall submit a Mylar plat along with all other documentation required as Conditions of Approval. The Mylar plat shall be recorded in the office of the Weld County Clerk and Recorder by Department of Planning Services' Staff. The plat shall be prepared in accordance with the requirements of Section 23-2-260.D of the Weld County Code. The Mylar plat and additional requirements shall be submitted within thirty (30) days from the date of the Board of County Commissioners resolution. The applicant shall be responsible for paying the recording fee. (Department of Planning Services) 5. The Department of Planning Services respectively requests the surveyor provide a digital copy of this Use by Special Review. Acceptable CAD formats are .dwg, .dxf, and .dgn (Microstation); acceptable GIS formats are ArcView shapefiles, Arclnfo Coverages and Arclnfo Export files format type is .e00. The preferred format for Images is .tif(Group 4). (Group 6 is not acceptable). This digital file may be sent to maps(o�co.weld.co.us. (Department of Planning Services) 6. The Special Review activity shall not occur nor shall any building or electrical permits be issued on the property until the Special Review plat is ready to be recorded in the office of the Weld County Clerk and Recorder. (Department of Planning Services) 7. In accordance with Weld County Code Ordinance 2005-7 approved June 1, 2005, should the plat not be recorded within the required sixty (30) days from the date the Board of County Commissioners resolution was signed a $50.00 recording continuance charge may be added for each additional 3 month period. (Department of Planning Services) USR-1582 City of Aurora— Prairie Waters Project Page 9 SITE SPECIFIC DEVELOPMENT PLAN SPECIAL REVIEW PERMIT DEVELOPMENT STANDARDS City of Aurora— Prairie Waters Project USR-1582 1. A Site Specific Development Plan and a Special Review Permit for a Major Facility of a Public Utility (Water Resource Project — Aquifer, Recharge and Recovery) in the A (Agricultural) Zone District, as indicated in the application materials on file and subject to the Development Standards stated hereon. (Department of Planning Services) 2. Approval of this plan may create a vested property right pursuant to Section 23-8-10 of the Weld County Code. (Department of Planning Services) 3. Prior to entry of a water court decree, Aurora shall only operate the well[s] if it first receives an approved 37-92-308(4) substitute water supply plan from the State Engineer; provided, however that pursuant to State Engineer rules, Aurora may operate the wells for well testing purposes, if it immediately returns the test water to the river, without getting a substitute water supply plan. (Department of Planning Services) 4. Copies of the water court decree and all well permits issued shall be submitted to the Department of Planning Services. (Department of Planning Services) 5. The applicant shall submit building plans to the Fort Lupton Fire Protection District for review and approval prior to the issuance of building permits. A letter of approval shall be submitted to the Department of Building Inspection. (Department of Building Inspection) 6. All liquid and solid wastes (as defined in the Solid Wastes Disposal Sites and Facilities Act, 30-20-100.5, C.R.S., as amended) shall be stored and removed for final disposal in a manner that protects against surface and groundwater contamination. (Department of Public Health and Environment) 7. No permanent disposal of wastes shall be permitted at this site. This is not meant to include those wastes specifically excluded from the definition of a solid waste in the Solid Wastes Disposal Sites and Facilities Act, 30-20-100.5, C.R.S., as amended. (Department of Public Health and Environment) 8. Waste materials shall be handled, stored, and disposed in a manner that controls fugitive dust, fugitive particulate emissions, blowing debris, and other potential nuisance conditions. (Department of Public Health and Environment) 9. The applicant shall operate in accordance with the approved "waste handling plan". (Department of Public Health and Environment) 10. The applicant shall comply with all provisions of the Underground and Above Ground Storage Tank Regulations (7 CCR 1101-14). (Department of Public Health and Environment) 11. Fugitive dust and fugitive particulate emissions shall be controlled on this site. The facility shall be operated in accordance with the approved dust abatement plan at all times. (Department of Public Health and Environment) USR-1582 City of Aurora— Prairie Waters Project Page 10 12. This facility shall adhere to the maximum permissible noise levels allowed in the Commercial Zone as delineated in 25-12-103 C.R.S., as amended. (Department of Public Health and Environment) 13. Adequate handwashing and toilet facilities shall be provided for employees and patrons of the facility. (Department of Public Health and Environment) 14. Sewage disposal for the facility shall be by septic system. Any septic system located on the property must comply with all provisions of the Weld County Code, pertaining to Individual Sewage Disposal Systems. (Department of Public Health and Environment) 15. A permanent, adequate water supply shall be provided for drinking and sanitary purposes. (Department of Public Health and Environment) 16. All potentially hazardous chemicals must be stored and handled in a safe manner in accordance with product labeling and in a manner that minimizes the release of hazardous air pollutants (HAP's)and volatile organic compounds (VOC's). (Department of Public Health and Environment) 17. If applicable, the applicant shall obtain a stormwater discharge permit from the Colorado Department of Public Health & Environment, Water Quality Control Division. (Department of Public Health and Environment) 18. The operation shall comply with all applicable rules and regulations of the State and Federal agencies and the Weld County Code. (Department of Public Health and Environment) 19. The access easement shall be graded and drained to provide an all-weather access. (Department of Public Works) 20. Should noxious weeds exist on the property or become established as a result of the proposed development the applicant/landowner shall be responsible for controlling the noxious weeds, pursuant to Chapter 15, Articles I and II of the Weld County Code. (Department of Public Works) 21. Additional Grading permits will be required before the aquifer construction begins. (Department of Building Inspection) 22. A plan review is required for each building requiring a permit. Plans will require the wet stamp of a Colorado registered architect or engineer. (Department of Building Inspection) 23. Buildings shall conform to the requirements of the codes adopted by Weld County at the time of permit application. (Department of Building Inspection) 24. Building permits shall be obtained prior to the construction of any building. (Department of Building Inspection) 25. A plan review is required for any additional building. Plans shall bear the wet stamp of a Colorado registered architect or engineer. (Department of Building Inspection) 26. Buildings shall conform to the requirements of the various codes adopted at the time of permit application. Currently, the following has been adopted by Weld County: 2003 International Building Code, 2003 International Mechanical Code, 2003 International Plumbing Code, 2002 National Electrical Code and Chapter 29 of the Weld County Code. (Department of Building Inspection) USR-1582 City of Aurora— Prairie Waters Project Page 11 27. Buildings may require an engineered foundation based on a site-specific geotechnical report or an open hole inspection preformed by a Colorado registered engineer. Engineered foundations shall be designed by a Colorado registered engineer. (Department of Building Inspection) 28. Fire resistance walls and opening, construction requirement, maximum building height and allowable areas will be reviewed at the plan review. Setback and offset distances shall be determined by the Weld County Code. (Department of Building Inspection) 29. Building heights shall be measured in accordance with 2003 International Building Code for the purpose of determining the maximum building size and height for various uses and types of construction and to determine compliance with the Bulk Requirements for Chapter 23 of the Weld County Code. Building height shall be measured in accordance with Chapter 23 of the Weld County Code in order to determine compliance with offset and setback requirements. When measuring buildings to determine offset and setback requirements, buildings are measured to the farthest projection from the building. Property lines shall be clearly identified. (Department of Building Inspection) 30. A Flood Hazard Development Permit shall be submitted for buildings constructed or moved, and grading in the 100-year flood plain. (Departments of Planning Services) 31. The property owner or operator shall be responsible for complying with the Design Standards of Section 23-2-240, Weld County Code. 32. The property owner or operator shall be responsible for complying with the Operation Standards of Section 23-2-250,Weld County Code. 33. Weld County Government Personnel shall be granted access onto the property at any reasonable time in order to ensure the activities carried out on the property comply with the Development Standards stated herein and all applicable Weld County regulations. 34. The Special Review area shall be limited to the plans shown hereon and governed by the foregoing standards and all applicable Weld County regulations. Substantial changes from the plans or Development Standards as shown or stated shall require the approval of an amendment of the Permit by the Weld County Board of County Commissioners before such changes from the plans or Development Standards are permitted. Any other changes shall be filed in the office of the Department of Planning Services. 35. The property owner or operator shall be responsible for complying with all of the foregoing Development Standards. Noncompliance with any of the foregoing Development Standards may be reason for revocation of the Permit by the Board of County Commissioners USR-1582 City of Aurora—Prairie Waters Project Page 12 • • ‘tit cc' :zo. DEPARTMENT OF PLANNING SERVICES SOUTHWEST OFFICE 4209 CR LONGMONT, CCO 88050504 PHONE: (720)652-4210, Ext. 8730 FAX: (720)652-4211 Wilk COLORADO September 28, 2006 City of Aurora c/o Mark Pifher 15151 E Alameda Pkwy#3600 Aurora CO 80012 Subject: USR-1582- Request for a Site Specific Development Plan and Special Review Permit for a Major Facility of a Public Utility (Water Resource Project-Aquifer, Recharge and Recovery) in the A(Agricultural)Zone District on a parcel of land described as N2 SW4; S2 SW4; part SE4 of Section 13, T1 N, R67W of the 6th P.M., Weld County, Colorado and Lot B of RE-1231, part N2 NW4; Lot A of RE-1231 part NW4 NW4 of Section 24, Ti N, R67W of the 6th P.M., Weld County, Colorado. Dear Applicant: Your application and related materials for the request described above are being processed. I have scheduled a meeting with the Weld County Planning Commission for December 19, 2006, at 1:30 p.m. This meeting will take place in the Hearing Room, Weld County Planning Department, 4209 CR 24.5, Longmont, Colorado. It is recommended that you and/or a representative be in attendance to answer any questions the Planning Commission members may have. It is the applicant's responsibility to comply with state statutes regarding notice to mineral estate owners. Colorado Revised Statute, C.R.S.24-65.5-103 (adopted as part of H.B.01-1088)requires notification of all mineral estate owners 30 days prior to any public hearing. The applicant shall provide the Weld County Planning Department with written certification indicating the above requirements have been met. It is the policy of Weld County to refer an application to any town or municipality lying within three miles of the property or if the property is located within the comprehensive planning area of a town or municipality. Therefore, our office has forwarded a copy of the submitted materials to the Brighton and Fort Lupton Planning Commission for their review and comments. Please call Brighton at (303)655-2023 and Fort Lupton at(303) 857-6694 for further details regarding the date, time, and place of this meeting. It is recommended that you and/or a representative be in attendance at the Aurora, Brighton and Fort Lupton Planning Commission meeting to answer any questions the Commission members may have with respect to your application. A representative from the Department of Planning Services will be out to the property a minimum of ten days prior to the hearing to post a sign adjacent to and visible from a publicly maintained road right-of-way which identifies the hearing time, date, and location. In the event the property is not adjacent to a publicly maintained road right-of-way, one sign will be posted in the most prominent place on the property and a second sign posted at the point at which the driveway (access drive) intersects a publicly maintained road right-of-way. The Department of Planning Services' staff will make a recommendation concerning this application to the Weld County Planning Commission. This recommendation will be available twenty-four(24) hours before the scheduled hearing. It is the responsibility of the applicant to call the Department of Planning Services' office before the Planning Commission hearing to make arrangements to obtain the recommendation. If you have any questions concerning this matter, please call. Respectfully, 1 Jacque kd - Planner PLANNING COMMISSIONERS' SIGN POSTING CERTIFICATE THE LAST DAY TO POST THE SIGN IS '%FC 9 too6 THE SIGN SHALL BE POSTED ADJACENT TO AND VISIBLE FROM A PUBLICALLY MAINTAINED ROAD RIGHT-OF-WAY. IN THE EVENT THE PROPERTY BEING CONSIDERED FOR A SPECIAL REVIEW IS NOT ADJACENT TO A PUBLICALLY MAINTAINED ROAD RIGHT-OF-WAY, THE DEPARTMENT OF PLANNING SERVICES SHALL POST ONE SIGN IN THE MOST PROMINENT PLACE ON THE PROPERTY AND POST A SECOND SIGN AT THE POINT AT WHICH THE DRIVEWAY (ACCESS DRIVE) INTERSECTS A PUBLICALLY MAINTAINED ROAD RIGHT-OF-WAY. I, Jacqueline Hatch, HEREBY CERTIFY UNDER PENALT OF PERJURY THAT THE SIGN WAS POSTED ON THE PROPERTY AT LEAST E 'i IWI' DAYS BEFORE THE PLANNING COMMISSIONERS HEARING FOR U5la- t 582, IN THE A (AGRICULTURAL) ZONE DISTRICT. AColocci.vc 14 Name of Person Posting Sign —Jacqueline Hatch 1 Lure of rPt? son Posting Sign 1--- g 9 STATE OF COLORADO ) )ss. 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': ....4.::::::::ht.•-• • h::..'•••"• ,: . . h., t, .....Z is §+ t 1.... 0 • • {4� kS ••�_t < it tips . , y ll,:v......r.:..:-.. xx t -k v � 0 . . • • .1..t„..4...-,.."....',,/,-...:E.-_-1:-:-:."...'.. } •g +r9 �� 5• ,r_ y.. S. ?r . 4+. rh. - ' b i#'° a` �(r*r Y .1...4(..,c,...-(...•••, +,. yy"�'i5 „,f o'rf. •• ' ' e t t: 4 i '^t htelrhr 4'4"1:44 a7.• • 1 pil $ r `"°t x`41 o''d d t • 'i: k • ,r y i, i₹: r..r. r. tb' y11. xe eS. '"°., °` FIELD CHECK Inspection Date: 12/8/06 APPLICANT: City of Aurora do Mark Pifher with the City of Aurora CASE# : USR-1582 REQUEST: A Site Specific Development Plan and a Special Review Permit for a Major Facility of a Public Utility(Water Resource Project—Aquifer, Recharge and Recovery)in the A(Agricultural)Zone District. LEGAL: N2 SW4; S2 SW4; Pt SE4 of Section 13, T1 N, R67W and Lot B RE-1231 Pt N2 NW4; Lot A RE- 1231 Pt NW4 NW4 of Section 24,Ti N, R67W of the 6th P.M.,Weld County, CO. LOCATION: North and South of CR 8 and east of and adjacent to CR 23 PARCEL ID#: 1469 13 000008; 1469 13 000042; 1469 13 000043; 1469 13 000011; 1469 24 000026& 1469 24 000025 ACRES: 393.24+/-acres Zoning Land Use N Agricultural N Agricultural E Agricultural E Agricultural S Agricultural S Agricultural W Agricultural W Agricultural Comments: Five homes on site (one a mobile) Agricultural property surrounding Pilot study being conducted on part County Road 8 is gravel County Road 23 is paved Platte River is on the east side Signature o House(s) ❑ Derelict Vehicles o Outbuilding(s) ❑ Non-commercial junkyard (list components) ❑ Access to Property ❑ Irrigation Sprinkler o Crop Productions o Crops ❑ Site Distance o Wetlands ❑ Mobile Home(s) o Oil & Gas Structures o Other Animals On-Site o Wildlife ❑ Water Bodies o Utilities On-Site (transmission lines) o Ditch ❑ Topography Note any commercial business/commercial vehicles that are operating from the site. NOTICE OF PUBLIC HEARING The Weld County Planning Commission will hold a public hearing on Tuesday, December 19, 2006, at 1:30 p.m. for the purpose of considering a Site Specific Development Plan and Special Review Permit for the property described below. Approval of the request may create a vested property right pursuant to Colorado Law. CASE NUMBER: USR-1582 APPLICANT: City of Aurora PLANNER: Jacqueline Hatch LEGAL DESCRIPTION: N2 SW4; S2 SW4; part SE4 of Section 13,T1 N, R67W of the 6th P.M., Weld County, Colorado and Lot B of RE-1231, part N2 NW4; Lot A of RE-1231 part NW4 NW4 of Section 24, T1N, R67W of the 6'" P.M., Weld County, Colorado. TYPE AND INTENSITY OF PROPOSED USE:Site Specific Development Plan and Special Review Permit for a Major Facility of a Public Utility(Water Resource Project -Aquifer, Recharge and Recovery)in the A(Agricultural)Zone District. LOCATION: North and south of CR 8 and east of and adjacent to CR 23. SIZE: 393.24 acres, more or less. The public hearing will be held in the Hearing Room, Weld County Planning Department, 4209 CR 24.5, Longmont, Colorado. Comments or objections related to the above request should be submitted in writing to the Weld County Department of Planning, 4209 CR 24.5, Longmont, Colorado 80504, before the above date or presented at the public hearing on December 19, 2006. Copies of the application are available for public inspection in the Department of Planning Services, 4209 CR 24.5, Longmont, CO 80504. Please call Donita May at(720)652-4210, Ext. 8730, or Fax # (720) 652-4211, prior to the day of the hearing so that reasonable accommodations can be made if, in accordance with the Americans with Disabilities Act, you require special accommodations in order to participate in this hearing as a result of a disability. All cases scheduled before the Planning m r C " n A !LED v Commission for hearing are subject to j_ '1 }is continuance, due to lack of quorum or otherwise. Contact a the 52-421 , f Planning Services at(720)652-4210,ext. ( �• l�. (j betut_tatil 8730,for hearing continuance information. Chad Auer, Chair Weld County Planning Commission To be published in the Fort Lupton Press. To be published one (1) time by November 29, 2006. 11/28/2006 09: 01 3036377955 PAGE 01 Non E OF PUBLIC HEARING PROOF OF PUBLICATION Weld Planning Toe Weld County Planning Commission will hold a publip FORT LUPTON hearing on Tuesday, December 19, 2006, at 1:30 p.m. for the STATE OF COLORADO purpose of considenng a Site Specd,c Development Plan end OUNTY OF WELD SS. Me Spedal Review Permit for e property described below. Approval of the request may create a vested property right c4rauan[ro Colorado Lew. I, Karen Lambert, do solemnly swear that I CASE NUMBER:USR-1582 APPLICANT:City of Aurora am the Publisher of the Fort Lupton Press; PLANNER:Jacqueline Hatch LEGAL DESCRIPTION: N2 SW4; that the same is a weekly newspaper printed S2 SW4, Part SE4 of Section 13, County,C art5E6th dLot to Wald E and published in the County of Weld, State 1231, part N2 NW4; Lot A of RE- of Colorado, and has a general circulation 1231 pert NW4 NW4 of Section 24, TIN, 867W of the 6th P.M., therein; that said newspaper has been Weld County,Colorado. TYPE AND INTENSITY OF published continuously and uninterruptedly PROPOSED USE: Site Specific Development Flan and Specialin said county of Weld for a period of more Review Permit for a Major Facility praeeiPer tit fora Major Resource than fifty-two consecutive weeks prior to the Project - An thy, Recharge and Recovery) In tn< A (Agricultural) and first publication of the annexed legal notice Zone Dlstrla. ocnnoN: North and addth of or advertisement; that said newspaper has CR a and east of and adjacent to CR 23. been admitted to the United States mails as SIZE:393.24 acres,more or less. The public having will be held in second-class matter under the provisions of the Hearing Room, Weld Count Planning Department, 4209 C the act of March 3, 1879, or any 24,5 Longmont, Colorado. comments ti°naColor do amendments thereof, and that said request should be newspaper is a weekly newspaper duly submitted In wntin to the Weld County Department of Plannln , n 4200 CR 24.5, Longmont, qualified for publishing legal notices and 504 Colorado 80 •before the above dad pr Pr604tea at the public advertisements within the meaning of the hearing",December 19,2005. laws of the State of Colorado. That the Copies ' Copies of the application we n available for public Inspection I the merit of Planning annexed legal notice or advertisement was Services. 4209 CR 24,5 g onymont,co sosd4.Pease call published in the regular and entire issue of Don'ts May at (720) 652-4210, Eat 0730.or Fax a 0'20) egg- every number of said weekly newspaper for 4211, prior to the day t of he hearing so that reeao the the period of 1 consecutive insertion(s); and a accordance can be made If, ac oraan a with the Americans that the first publication of said notice w as wit.) al acclltlee Act, you require special accommodations Act, ns in order in the issue of participate In this hearing as a newspaper, dated 29th day of to resistpe of disability. All cases November, 2006, and the last before the on the 29th scheduled°°,°^ for the Planning are day of November, 2006. subject to continuance,due to lack or quorum or otherwise. Contact the Department of Planning Services at (720 652,4210, ext.8730, for hearing continuance information. Chad Auer,Chair • Weld County Planning Commission To be nub fished In the Fort Lupton Press. To be published one (1) time by N°vembe-29.2006. Publisher. Su.scriberr and orn before me, this the 24th day of November, a'6. a,\ LC) ter. ith . Lig-7 1 `t , • ,, _ Pu lie. F: 9 �-0 �a 7`sv^'oN EX?\a� CASE NO.401951 key 35414 SITE SPECIFIC DEVELOPMENT PLAN AND USE BY SPECIAL REVIEW (USR) APPLICATION FOR PLANNING DEPARTMENT USE DATE RECEIVED RECEIPT# AMOUNT$ CASE#ASSIGNED: APPLICATION RECEIVED BY PLANNER ASSIGNED: Parcel Number: 146924000025, 146924000026, 146913000008, 146913000011, 146913000042, 146913000043 Legal Description: PARCEL 1: THE NORTH HALF OF THE SOUTHWEST QUARTER OF SECTION 13, TOWNSHIP 1 NORTH, RANGE 67 WEST OF THE 6TH P.M., COUNTY OF WELD, STATE OF COLORADO, PARCEL 2: THE SOUTH HALF OF THE SOUTHWEST QUARTER OF SECTION 13, TOWNSHIP 1 NORTH, RANGE 67 WEST OF THE 6TH P.M., COUNTY OF WELD, STATE OF COLORADO, PARCEL 3: LOT B OF RECORDED EXEMPTION NO. 1469-24-2-RE 1231, RECORDED JUNE 4, 1990 IN BOOK 1266 AT RECEPTION NO. 2215849, BEING A PART OF THE NORTH HALF OF THE NORTHWEST QUARTER OF SECTION 24, TOWNSHIP 1 NORTH, RANGE 67 WEST OF THE 6TH P.M., COUNTY OF WELD, STATE OF COLORADO, PARCEL 4: LOT A OF RECORDED EXEMPTION NO. 1469-24-2-RE 1231, RECORDED JUNE 4, 1990 IN BOOK 1266 AT RECEPTION NO. 2215849, BEING A PART OF THE NORTH HALF OF THE NORTHWEST QUARTER OF SECTION 24, TOWNSHIP 1 NORTH, RANGE 67 WEST OF THE 6TH P.M., COUNTY OF WELD, STATE OF COLORADO, PARCEL 5: THE SOUTHEAST QUARTER OF SECTION 13, TOWNSHIP 1 NORTH, RANGE 67 WEST OF THE SIXTH PRINCIPAL MERIDIAN, COUNTY OF WELD, STATE OF COLORADO, BEING MORE PARTICULARLY DESCRIBED AS FOLLOWS: BEGINNING AT THE SOUTHEAST CORNER OF THE SOUTHEAST QUARTER OF SAID SECTION 13; THENCE NORTH 90°00'00"WEST ALONG THE SOUTH LINE OF SAID SOUTHEAST QUARTER A DISTANCE OF 2629.95 FEET TO THE SOUTHWEST CORNER OF SAID SOUTHEAST QUARTER; THENCE NORTH 00°03'15"WEST ALONG THE WEST LINE OF SAID SOUTHEAST QUARTER A DISTANCE OF 2641.83 FEET TO THE NORTHWEST CORNER OF SAID SOUTHEAST QUARTER; THENCE NORTH 89°53'37" EAST ALONG THE NORTH LINE OF SAID SOUTHEAST QUARTER A DISTANCE OF 2626.74 FEET TO THE NORTHEAST CORNER OF SAID SOUTHEAST QUARTER; THENCE SOUTH 00°07'25" EAST ALONG THE EAST LINE OF SAID SOUTHEAST QUARTER A DISTANCE OF 2646.71 FEET TO THE POINT OF BEGINNING; COUNTY OF WELD, STATE OF COLORADO. Flood Plain: X Zone District: A , Total Acreage: 393.24 , Overlay District: N/A Geological Hazard: N/A , Airport Overlay District: N/A FEE OWNER(S) OF THE PROPERTY: Name: City of Aurora Work Phone # 303-739-7370 Home Phone # E-mail Address: 15151 E. Alameda Parkway, #3600 Address: City/State/Zip Code: Aurora, Colorado 80012 APPLICANT OR AUTHORIZED AGENT (See Below:Authorization must accompany applications signed by Authorized Agent) Name: Mark Pifher, City of Aurora Work Phone # 303-739-7370 Home Phone # E-mail mpifherVici.aurora.co.us Address: 15151 E. Alameda Parkway, #3600 Address: City/State/Zip Code: Aurora, Colorado 80012 -1- PROPOSED USE: The Prairie Waters Project is a water resources project for the City of Aurora. The portion of this project located within in Weld County includes alluvial wells, water pipelines, water storage at Walker Reservoir and an Aquifer, Recharge and Recovery (ARR) site. This application addresses the ARR site located near the intersection of WCR 23 and WCR 8. The ARR site is proposed to be developed as a natural water purification system which will include: a low-permeability barrier, infiltration basins and recovery wells. There are no aboveground structures proposed with the development of an portion of the Prairie Waters Project within Weld County. One of the existing residences on the City of Aurora's property will be used as a caretaker's residence and control house. 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. Signatures of all fee owners of property must sign this application. If an Authorized Agent signs, a letter of authorization from all fee owners must be included with the application. If a corporation is the fee owner, notarized evidence must be included indicating that the signatory has to l, 7 egal authority to sign for the corporation. Sig um:Owner or Authorized Ag D to Signature:Owner or Authorized Agent Date -2- City of Aurora Weld County laarang Department 9UILDING Water Department SAP 5 2006 Administration 15151 E.Alameda Parkway, Suite 3600 REc t ED art Aurora,Colorado 80012 NIW Phone:303-739-7370 www.aurorawater.org September 21, 2006 Ms. Jacqueline Hatch, Planner Weld County Department of Planning Services 4209 County Road 24 %2 Longmont, CO 80305 RE: Hearing Date for the Prairie Waters Project Use By Special Review Application for a Major Facility of a Public Utility Dear Ms. Hatch: Aurora Water understands that the Weld County Department of Planning Services would like to schedule the public hearing for the Prairie Waters Project Use By Special Review Application for a Major Facility of Public Utility for the December 19, 2006 Planning Commission hearing date. This hearing date is acceptable to us. We look forward to the opportunity to present our application before the Weld County Planning Commission. Sincerely, y • 'Mark Pifher, Depyty Director Aurora Water EXHIBIT I 11.-P:11,„ ' Memorandum from Aurora Water To: Aurora Water Management Staff From: Ron Miller, City Manager; '5 Peter Binney, Director Aurora Water r Date: September 7,2006 Subject: Permit Procedures In accordance with Section 2-62 of the Aurora City Code as adopted by the Aurora City Council, the City Manager possesses the authority to approve and execute applications for permit approvals and related agreements on behalf of the City, including those concerning the extra territorial approvals that may be required for the construction and/or operation of water and wastewater facilities. Pursuant to Section 2-551 of the Aurora City Code as adopted by the Aurora City Council, the Director of Utilities has the responsibility to undertake those actions necessary to plan, construct, operate and maintain the City's water and wastewater systems. Both the City Manager and the Director of Utilities possess the authority to delegate certain duties, as appropriate. The City Manager and the Director of Utilities hereby delegate to the Deputy Director for Water Resources the authority to execute permit applications and related agreements necessary to obtain those approvals required for the construction and/or operation of water or wastewater facilities located outside Aurora municipal boundaries. ® AURORA WATER Prairie Waters Project 15151 E. Alameda Parkway,3rd Floor Aurora,CO 80012 August 31,2006 Ms.Jacqueline Hatch,Planner Mr. Kim Ogle, Planning Manager Weld County Department of Planning Services 4209 County Road 241/2 Longmont,CO 80305 RE: Use by Special Review Application for a Major Facility of a Public Utility, Aurora Water,Prairie Waters Project -located near the intersection of WCR 23 and WCR 8,west of Ft. Lupton,Colorado Dear Ms. Hatch and Mr. Ogle: On behalf of the Aurora Water,we respectfully submit this Use by Special Review Application for a Major Facility of a Public Utility for the Prairie Waters Project. This Use by Special Review application is being submitted to Weld County in response to the requirements found within the Weld County Code,Section 23 (Zoning—Procedures and Permits), Division 5 Special Review Permits for Major Facilities of Public Utility or Public Agency. Aurora Water's water resources project,known as the Prairie Waters Project,includes the following features within Weld County: • Two alluvial well fields along the South Platte River, • An aquifer, recharge and recovery area (ARR Site A), • A water pipeline network, • A private telecommunication network to support Security Control and Data Acquisition (SCADA), operational communications,and other data transmissions,and • Water storage at Walker Reservoir. The legal description for this USR application is defined as the ARR Site A property only,393- acres located near the intersection of WCR 23 and WCR 8. The other portions of the project are either specifically excluded from the code or, as in the case of Walker Reservoir,will be the subject of a future amendment once mining and reclamation activities are complete. However, in an effort to describe how this site is incorporated in the Prairie Waters Project, descriptions for all project components located in Weld County are provided throughout this USR application. In addition,as part of this USR application,Aurora Water will also be requesting that Walker Reservoir be administratively amended to the USR permit by plat when mining and reclamation activities are complete. Weld County Use by Special Review Application August 21,2006 Page 2 of 3 Consistent with the Use by Special Review submittal checklist,the application contains the following: • Application Fee ($5,000) • USR Application Form (1 Original + 19 Copies) • USR Plat Maps(24" x 36") (20 Copies) • Reduced USR Plat Maps (8-1/2" x 11") (1 Copy) • Use by Special Review Questionnaire(20 Copies) • Weld County Road Access Information (20 Copies) • Statement of Adequate Water Supply(2 Copies) • Evidence of Adequate Sewage Disposal (2 Copies) • Deed or Legal Interest In The Property (1 Copy) • Certificates Of Conveyance (1 Copy) • Soils Report(2 Copies) • Affidavit and Certified List of Names and Addresses of Surface Owners within 500' of Property (1 Copy) • Affidavit and Certified List of Names and Addresses of Mineral Owners and Lessees of Minerals(1 Copy) • IGA Notice of Inquiry(1 Copy) • Project Summary Statement(1 Copy) • Project Need Statement(1 Copy) • Site Selection and Alternatives Analysis(1 Copy) • Waste Handling Plan (4 Copies) • Traffic Impact Study(4 Copies) • Hazards and Emergency Response Procedures (4 Copies) • Drainage Report (4 Copies) • Environmental Reports (4 Copies) o Cultural and Archaeological Historic Records Search Results o Threatened and Endangered Species Reports and Clearances o Wetlands Delineation (In progress-to be submitted upon completion) • Land Management and Weed Control Plan (4 Copies) • Pilot Study Technical Data (4 Copies) • Oil and Gas Agreements (1 Copy) • Ditch Company Agreements(1 Copy) For your convenience,we have also provided a bound version of the submittal materials listed above and a CD with all of the documents provided in a PDF format. In addition to the documents listed above,we have enclosed the following separately bound documents in hard copy and electronic format: • Voluntary Clean-up Plan, C:\Documents and Settings\dholm\Local Settings\Temp\Cover Letter Aug_2I_06.doc Weld County Use by Special Review Application August 21,2006 Page 3 of 3 • Phase I and Phase II Environmental Site Assessment Reports, • Geotechnical Investigation and Soils Report,and • Flood Hazard Development Permit Application Please do not hesitate to call me at 303-739-7317,or our permitting representative,Ms.Julie Vlier at 303-772-5282,if you have any questions or concerns. Thank you for your assistance. Sincerely, AURORA WATER Mark Pifher Deputy Director,Aurora Water Attachments C:\Documents and Settings\dholm\Local Settings\Temp\Cover Letter Aug_21_06.doc SUMMARY OF TERMS WELD COUNTY USR Glossary of Terms ARR Aquifer Recharge and Recovery BMPs Best Management Practices CCWCD Central Colorado Water Conservancy District CDPHE Colorado Department of Public Health and Environment CFR Code of Federal Regulations DMG Division of Minerals and Geology IGA Intergovernmental Agreement ISDS Individual Sewage Disposal Systems LPB Low Permeable Barrier NRCS Natural Resource Conservation Service NRHP National Register of Historic Places OSHA Occupational Safety and Health Administration PWP Prairie Waters Project RBF Riverbank Filtration RO Reverse Osmosis SCADA Security Control and Data Acquisition Tt Tetra Tech UGB Urban Growth Boundary USACE U.S. Army Corps of Engineers USFWS U.S. Fish and Wildlife Service USR Use By Special Review PRAIRIE WATERS PROJECT PAGE 1 PROJECT NEED STATEMENT WELD COUNTY USR Project Need Statement The City of Aurora is vigorously pursuing the development of the Prairie Waters Project. It is vitally important that the City of Aurora expand its water supply system to meet existing and future demands. Recent drought conditions have exposed system inadequacies and highlighted the need to improve system reliability. In March of 2003, Aurora's reservoirs were depleted to 26 percent of capacity. A drought of continuing duration could have severely compromised the city's ability to meet even essential demands for potable water. Despite aggressive conservation measures, Aurora's current supply is inadequate to meet all potential service area needs during a drought, and as the city grows additional supplies will be needed to service its residents. The City of Aurora must increase its water delivery and storage capacity, while also maintaining and upgrading pipes, pump stations and treatment plants. A comprehensive, integrated resource plan by the City of Aurora evaluated numerous water supply options, including new reservoir storage, transfer of agricultural water rights, and/or new trans- basin diversions. The plan identified the Prairie Waters Project as the most efficient and effective way to meet the City's water demands. In addition, in comparison to other alternatives, it can be completed in a reasonable lime frame, at an affordable cost, and without adverse impact to the environment. The Project will maximize Aurora's existing water rights in the South Platte River through the beneficial reuse of waters which already belong to the City. It will be capable of delivering approximately 13,200 acre-feet per year by 2010. The Aurora City Council, having been briefed on the water supply situation and means to address existing and future water demands, determined that new water infrastructure and supply investment was necessary. It has endorsed the Prairie Waters Project as an appropriate means of meeting those demands. The Prairie Waters Project consists of three major elements: 1. North Campus Wells and Natural Purification Systems: Wells for bank filtration and an aquifer recharge and recovery system to extract and purify Aurora's water supply. 2. Conveyance Systems: Thirty four miles of pipeline and three pump stations to convey water from the North Campus to the Aurora Reservoir Water Purification Facility. 3. Aurora Reservoir Water Purification Facility: Facility to provide final purification using softening,advanced oxidation and granular activated carbon absorption. This Application for Use by Special Review includes a description of the North Campus facilities that will be located in Weld County. Similar facilities are planned to be located in Adams County. Aurora is currently working with Adams County to address the permitting requirements. The Project can be operated without adversely impacting vested senior agricultural water rights along the South Platte River. This is possible because the Prairie Waters Project utilizes water supplies that either have been introduced to the South Platte River basin through transfers from the Colorado and Arkansas River basin, or are the consumptive use PRAIRIE WATERS PROJECT PAGE 1 OF 3 PROJECT NEED STATEMENT WELD COUNTY USR portion of previously transferred rights. In addition, water stored in gravel pits will be used as an augmentation supply to ensure that Aurora's diversions from the South Platte do not interfere with vested senior water rights in the vicinity of the project. The Prairie Waters Project is the most sustainable means of improving the reliability of the City's supply. The Prairie Waters Project will: • Maximize the use of existing water rights owned by the City • Develop additional water delivery and water purification capacity • Comply with all local,State and Federal regulations • Achieve these goals in an environmentally sensitive manner The Prairie Waters Project will allow Aurora to use its existing water rights by pumping water from the South Platte River alluvium through a series of wells for delivery to isolated recharge areas in a process known as "aquifer recharge and recovery." In addition to providing a reliable and environmentally sound method for diverting water from the South Platte River system, the wells and aquifer recharge and recovery steps will provide natural purification of the new water supply through river bank and recharge area filtration. Combining the best from nature and science, the Project's purification processes will protect public health using sustainable,renewable and cost effective technologies. The aquifer recharge and recovery basins will be created through construction of a low permeability barrier around the perimeter of the protected recharge area. By allowing the water to pass through the sands and gravels, natural cleansing of the water occurs without the addition of chemicals. This purification process is biological in nature and will not adversely impact the quality of the groundwater or the soils in the protected recharge area. As a result, there is no cause for concern about accumulation of pollutants within the ARR facilities. Aurora will build, operate and maintain the Prairie Waters Project in a manner consistent with existing and planned land uses in the County. Aurora is committed to cooperating and coordinating with the agricultural community and industrial and municipal land owners in the project vicinity. Approximately 400 acres of property will be used to create the aquifer recharge and recovery site. The site will be undeveloped and will advance preservation efforts now underway for the riparian wildlife corridor of the South Platte River. Aurora will work with the County in exploring opportunities for recreational access and open-space preservation. The project involves very few structures, and all architecture and landscaping will be designed to comply with Weld County's Comprehensive Plan, and to fit into the rural character of the County. Aurora intends to comply with the Comprehensive Plan (Articles I - V) and Zoning code, including: • Respect for Agricultural Character: The Project will complement the agricultural setting of the area. Short-grass prairie grasses to be planted in large areas in the aquifer recharge and recovery area will provide low-maintenance natural wildlife habitat Buildings are small and will be designed in keeping with the rural character of the area. Aurora will PRAIRIE WATERS PROJECT PAGE 2 OF 3 PROJECT NEED STATEMENT WELD COUNTY USR maintain the landscaping to ensure that the properties remain agricultural in appearance,and will protect vested senior agricultural water rights. • Diversity: The Project represents a low-intensity land use that will be compatible with existing agricultural land uses as well as other future land uses that may include sand and gravel mining, low-density residential development, agriculture, or open space (Article II). The pipeline corridors are designed to parallel existing and future public rights-of-way, unless environmental conditions or landowners' preference dictate otherwise. In the interim, the location of the pipeline corridors will allow affected landowners' to continue to farm their land. The location of the well field near the South Platte River and within its floodplain represents an area that historically has been characterized as non-prime agricultural land and unsuitable for land development. Again, affected property owners will be able to continue to farm their land or develop the gravel resources as they choose. The Project recognizes that mineral resource extraction is an essential industry in the County, while this project will leave existing gravel resources in place at the Aquifer Recharge and Recovery sites. If Aurora decides to use other purification processes in the future, these gravel resources will remain available for mining (Article I). In addition, Aurora is cooperating with adjacent property owners involved in mineral extraction to insure that construction and operation of the aquifer recharge and recovery systems do not interfere with their current and future mining plans. • Compliance with Weld County Planning: Aurora has carefully reviewed Weld County's Comprehensive Plan, and the Project will be designed and constructed to prevent any negative impacts on air, water, waste, noise and public health. The aquifer recharge and recovery site will be cleared of any existing agricultural structures that do not represent a cultural asset to the County, and the site will be cropped and maintained to retain its rural character. The construction contractors will be required to use best- management practices for dust and erosion control, and Aurora will continuously monitor their progress to ensure compliance. Environmental resources such as wetlands and wildlife habitats will be protected, and the construction contractors will not be allowed to disturb these sensitive areas. Finally, testing and analysis of the natural biological purification processes indicates no adverse impacts to the quality of water, sands and gravels in the aquifer recharge and recovery site (Articles IV and V). • Environmental Sustainability: The Prairie Waters Project will allow Aurora to fully utilize water the city already owns. In turn, Aurora will conserve and efficiently manage Colorado's most important natural resource - water. This will create a positive impact on water resources at the local and State levels, which is consistent with the intent of water goals and policies within the Comprehensive Plan (Articles II, III, and IV). The Project also respects the natural environment. The attached USR Questionnaire addresses how the Project will be designed to conserve critical ecosystem components, preserve and enhance the visual character of the area, and remain consistent with the Agricultural zone district designation. PRAIRIE WATERS PROJECT PAGE 3 OF 3 SUMMARY STATEMENT WELD COUNTY USR SUMMARY STATEMENT This summary statement is intended to address the requirements found within Weld County Code,Sec. 23-3-370 (Application Requirements, Item C). The scope of the Prairie Waters Project within Weld County includes: two alluvial well fields along the South Platte River, a water pipeline network, a private telecommunication network to support Security Control and Data Acquisition (SCADA), operational communications, and other data transmissions, water storage at Walker Reservoir and aquifer recharge and recovery (ARR) Site A. However, the legal description for this USR application is defined as the ARR Site A property only. The other portions of the project are either specifically excluded from the code or, as in the case of Walker Reservoir, will be the subject of a future amendment application once mining and reclamation activities are complete. However, in an effort to describe how this site is incorporated in Aurora's larger water resources project, the Prairie Waters Project, descriptions for all of the project components located in Weld County are provided throughout this USR application. 1. Source, capacity, destination and type of facilities, support structures, lines, etc., involved: The Prairie Waters Project (PWP) is a water resources project for the City of Aurora. Within Weld County the project consists of an ARR facility, two well fields, a pipeline corridor, and Walker Reservoir. This application is for the ARR facility (ARR Site A) only,but includes complete descriptions of all project components. The source of the water for the project is the water rights already owned by Aurora that will be diverted from the South Platte River through a series of alluvial wells. The water will then be piped to isolated ARR areas. The three principal components of ARR Site A are the low permeable barrier (LPB), infiltration basins and recovery wells. The LPB will be constructed to contain the water and isolate the naturally purified water from the surrounding alluvial aquifer. Water from the alluvial well fields will be delivered to the four infiltration basins. Recovery wells will collect the water in the ARR and it will be piped to Pump Station #1 in Adams County near S.H. 7 and Riverdale Road. Please refer to the ARR site plan, Figure 1. No new buildings will be constructed at ARR Site A. There are two existing homes and several associated outbuildings located outside the LPB that will remain. One of the existing homes will be used as a caretaker's residence. The second home will either remain a residence or will be converted to office space. The outbuildings will be used for storage and servicing of maintenance equipment, office space and storage of the control equipment for the facilities. Accessory above-ground facilities, such as electrical utility cabinets, will house the electrical equipment to operate the wells. (There will be a total of approximately 9.5 miles of water pipeline corridor in Weld County). 2. Number and description of alternative locations or routes considered, with a summary emphasizing reasons for favoring a particular site or route: Prior to selecting riverbank filtration (RBF) and ARR, Aurora evaluated several options to divert its existing water rights from the South Platte River, while maximizing natural purification processes. Other alternatives considered include mechanical pretreatment and direct diversion utilizing excess capacity in existing ditches. The reasons for favoring RBF and ARR in Weld County are summarized below. PRAIRIE WATERS PROJECT Page 1 of 4 N u `vI-- .., 3 11J oPt � c2 , ..� \} / �-� �1 � •t i \\ f �r J ? Ing Z t.) it it %I . se--.P X IL IL?--a-5- -....__ , .44 IN 44.: z to Q • 4, .I r s • r - ^ / IL im. la If i , „b.., fC{ A is 1 0 1.1.1 g a i k. I, .3 ... �" `uill,...J U - W M9 i_ i, . 1 E II Ca - _ . _ 5, < p . IL- i , 4ro �*� .... ,.. . ,A Ili - - 03 E.) E c, -----#" a.j < u ......„ lis III P . 0 › a_ U , I 150�1 Ti • /w U0 U ,�r r A Sie I 1. 4 J .., 7 IL..„ itik. "S i ' . 4 • O1%1%1 IS .4 liC I ....... ..r �~ - 4+ - I ille . s #1T 'a. II 7.1. Firl4pli .ad I NO N w c. 1, , ,,,,p,- i ,...., Li i i -, . . ' —.141:NseNr.- --I ,_ ,._ �. 1 ...`_`Af • 1 ...,I k i E, \ 1 ---\ .. . . • � i5 h / f I e i 1. • Li I tit te Li r On 1 tir L r `` 1 \( ._,� illiallcitiscsk% Jr> I •• � `�+ `\ •,.....„,c,.. e ii O N.-..---.1„ -1/4„.. 1 c,i, i. , __. _ . ,i.,---, ...._, \\., _ f r O i - ` -- • 2 i, I I 4, OillIllPlli Z.. etallat. 4 N ii, 0 < 44 kin CO •4141.19 l• 4 I if, It a • • 0 di i , 4.. a \ \ .... I i * , - 4 , ! , / .... , _... 1 / . s1,,. . • •...r ` \� • I • r -di asititliP.i ao 7 e r .v r�- r th I 4iiii / air ei 1/4•101 40 At \• . ' ..."...."..N. -� `` i w. r a ``\ ,i .__ Illr ) , N___ .. _ • w .y -. � . • . ., a.. .. . . r—. (..... )49 AA -._ 4 _ • ` , . t z J. ilti• iv ...4 \......1 N... , \ -- -, w. ti ~��. •4. \\� `1 `N. \.�� v.... -� \ ( t rl � \ice..�.,j\w• , /� _ . SUMMARY STATEMENT WELD COUNTY USR • Environmentally sound natural pretreatment processes RBF and ARR avoid the brine waste stream that is associated with a reverse osmosis treatment process, and high power and chemical usage associated with other options. Impacts to cultural or historic landmarks are avoided, as well as potential impacts to threatened and endangered species and wetlands. • Favorable geologic conditions Pilot testing at ARR Site A has verified that the ideal hydrogeologic are present at ARR Site A. • Available lands Aurora was able to acquire strategically located lands for the ARR facility and augmentation storage at Walker Reservoir. These properties and their location with respect to each other are important features of the project. • Low intensity land use compatible with surrounding area The proposed land use is consistent with comprehensive planning documents for Weld County, Ft. Lupton and Brighton. The Prairie Waters Project preserves 99 acres of riparian corridor, supplemented with the creation of 186 acres of short grass prairie. In evaluating pipeline routes, Aurora considered alternative alignments, based on the following criteria: • Avoiding jurisdictional wetlands and sensitive habitat, • Engineering feasibility, • Minimizing pipeline length • Minimizing ditch crossings • Acceptance by affected property owners, and • Minimize traffic conflicts during construction Three separate alternatives were evaluated and descriptions are as follows: Alternate 1 and Alternate 2 The design intent of Alternate 1 is to locate the pipeline corridors within public right-of- way to the maximum extent possible. This alignment is intended to minimize the impacts to surrounding residents from easement acquisition and pipeline construction. Please see Figure 2 for the locations of Alternates 1 and 2. Alternate 2 was developed after discussions with Weld County Public Works indicated that locating the pipeline alignment in public right-of-way would not be feasible. This alternate parallels existing public right-of-way where possible. Based on favorable negotiations with the landowner south of WCR 4.5, the pipeline alignment heads due south until the alignment nearly reaches 168th Street (Baseline Road). PRAIRIE WATERS PROJECT Page 2 of 4 LEGEND - - -�- .1. l7 I ! '- I" ! �� ,I • r ilj _ - �-`_ RIVERS AND CANALS 4 s if e �I FLOODPUUN r Y • O.:FJ.b��.. I Q i tea.' �� — -- — LOW PERMEABILITY BARRIER I a JO - , 34; :,„ ARR PROPERTY LINE it _ ` .+ b I� I �_'L�_,a t a' -495C• EX.CONTOURS i a p - /�}►'4 - f 2 r-. ___•-- it "I" 1 \ 4 FLO•city id r J \ �iII, ERNATE-1 i1B '� I >•_!N 13 - - T4GNMENT-'„ n-� p�o o ALIGNMENTS I• d, ) i. i : o : 41 l a, AR•R SITE A "-PPROPOSED , 1 03 rl �g i� I � • I , LLFRV Ire ALTERNATE-1 • •• O C of i 6\i. t' • �.`i I: 1i '1 :-.4e•--)` ALTERNATE-2 . I q _ 3n_ » L u a v o Nii. t !I ( r _ al "'''T"Or• d" r• ',, - CC . per _ 9 11 1 I( It imi IRRIGATED AGRICULTURAL LAND r ii:1 I ,,,, , , .,,,,..1 ,khfi 1 • �,,. I I Z 'it I .i dl g �. 1 4.PagittftHir. •° " ns 03° r o. fil 4' 24 .,,r ,ice l_o �- ' �r f : , Irt .... Lt71iT — I • ° FLOOD HAZARD INFORMATION: L(:::?... _________, I -i- PORTIONS OF THIS PROPERTY ARE LOCATED WITHIN THE 100YR. +• ,p;.17.N - I . FLOODPLAIN. 1 :} P;�� g FLOODPLAIN INFORMATION IS FROM FIRM FLOOD INSURANCE RATE ALTERNATE 2' r _ , '1.2s `'r MAP, PANEL NO. 080266 0981 C, DATED SEPT. 28. 1982, AND PANEL NO. aLIGN,tENT ' WCR G I 080266 0983 C. DATED SEPT. 28, 1982. lel % ---- _ oc c' '=-4,icn .----L-s---t... " ' ,;. FLOODWAY INFORMATION IS FROM FLOODWAY FLOOD BOUNDARY II ~ e I It ( AND FLOODWAY MAP WELD COUNTY, COLORADO (UNINCORPORATED Sil .-----,..ill ii,,,,..tistrin......!,...,-B)..... ° ,. t AREAS) PANEL 12 OF 14 COMMUNITY PANEL NUMBER 080266 0012, s _ i I l' __ __1:1—r--- -4, I G]) DATED SEPTEMBER 28, 1990. '" �A ,i BASEMAP AND TOPOGRAPHIC I Litt Y tii�l.':`1 ALTErYflRTE-1 { ALTERNATE-1 - r' _ ..A IL ' --f INFORMATION: ll I ALTERNA ALIGNMENT / `� f l ° I) � �11i; IIr! I jUGNMEN�: i a• r./../ _," -. I • . I �14 !! I i t THE BASEMAP INFORMATION WAS COMPILED WITH SURVEY 5 _ _ rCCC __ • '� !: _ * INFORMATION PREPARED BY: WI • s _ I c, v ( i FARNSWORTH GROUP .. i4n J ! 1 8055E TUFTS AVENUE SUITE 850 AL - i, .. / 0,d.• -1,) DENVER, CO 80237 �! ° ;) (303) 692-8838 •ALIGN'. o yr�A TOPO WAS GENERATED FROM FARNSWORTH AERIAL PHOTO. V>111 �, `�1I: 1A ° ,sl a C - UTIUJTY INFORMATION: r "; fi# I1`I Kr!jf UTILITY INFORMATION WAS PROVIDED BY BUCKEYE, DUKE ENERGY, �'; I ! t` r o , ��I`' KERR MCGEE, XCEL, ENCANA, KP KAUFFMAN. 0WEST, AND TODD 1( .,- I L, , P CREEK. f! ‘41 TE-1 i - o a I ( P OIL AND GAS LINE LOCATIONS HAVE NOT BEEN FIELD VERIFIED. 1 thoo- ALTS • . •7J l • %• U +r _f rr 1'� �'rr A_IGNM .1 Hart ' Q ..~o° .f :EXISTINGir= p „ .,.1. g , / SLURRY WALL , / ° I !' I ° s lee./77:ar ALL COMPONENTS OF THIS PROJECT ARE LOCATED OUTSIDE FORT �+!- �°�• LUPTON'S ADOPTED URBAN GROWTH BOUNDARY 1, <, fit " � 2 ` + !! !i a ' TERNAT • / � i r u GNMENT ' T. WALKER ` LMTV OF BRIGHTON USE nCOMPREHENSIVE PLAN ONS: • RESERVOIR, - 1 -lq ,P BRIGHTON URBAN GROWTH BOUNDARY i 2 • T 1 N 1- r ( a :, T 1 S r��% e i „bit .— 8TH ST (BASELINE RD.) d'', ,�+v r}• RURAL RESIDENTIAL iii,._ ,, ' , }. I: . •• .4 l« c1/4 46 AGRICULTURAL � 1 :i �' / 'rte- 41 �3 H.y- I. 2 -.� .p �' : t NOTE flr �, ✓1 1. BRIGHTON COMPREHENSIVE PLAN DESIGNATIONS EAST OF THE r(fIL'r. 1. - ' I�-' t � • I I �I) SOUTH PLATTE RIVER ARE NOT SHOWN AS THIS IS OUTSIDE THE m Y �r L• IMA PROJECT AREA: -2,° PUMP STATION (i �`• I .---,--, ail I: ,.- f,_f -:*'. •I, ' ¢' 2. BRIGHTON URBAN GROWTH BOUNDARY IS PER THE WELD COUNTY ?_ Zi, URBAN GROWTH BOUNDARY & INTER GOVERNMENTAL MAP , .,_ Iibi - - rl t� PRODUCED BY WELD COUNTY PLANNING SERVICES, JULY 2005 L ARR S ITE BI . S;,,, 'r' -_ nL. N �:. t� , , � 1C - THE PRAIRIE WATERS PROJECT IS ENTIRELY OUTSIDE FT. _ SOUTH�}, 41- ` _. aJ. ' 't�r�f 3. LUPTON'S URBAN GROWTH BOUNDARY. ♦ ��' �' �� rI IRRIGATED AGRICULTURAL LAND IDENTIFIED THROUGH REVIEW OF r_It I a I <,''` L_ ^�_1 yl d g 4. DIGITAL GLOBE SATELLITE IMAGERY COLLECTED ON OCTOBER 25, ,, �6'. 2004. Q / r ` i ..',�-1� r. 'I S / , , _. J arm • T it fa Avg n I `v V i _r s g I i i z zg s ve s£ 3 TETRA TECH RMC 0 Masao iiil ,yJ SAGO SI..co AURORA WATER t&Ro%t North 1 o Sal 100(2 X)0(7 NO REVISION DATE BY vaarcr LEr g i - - PRAIRIE VkATERS PROJECT WELD CO"NT" I nar SCALE: 1"=1OOO ALTERNATE PIPELINE ALIGNMENT /MM,I^ I. 'Al Rle I 3/O6 i"=2OOO' t •'"" l` I I9.0476.039.AM I"' 2 OF 3 SUMMARY STATEMENT WELD COUNTY USR Both Alternates 1 and 2 are longer than the preferred alignment. This greater length would result in a greater number of landowners being impacted by the project. Additionally, Alternative 1 has a higher cost and Alternative 2 has greater environmental impacts than the Preferred Alternative. Preferred Alternative The preferred alternative represents further refinement of Alternate 2. Based on continued negotiations with the same landowner south of WCR 4.5, their preference was to shift the alignment so that it generally parallels the west side of the Brighton Ditch. This minimizes the impacts to this agriculturally productive land while locating the pipeline in an existing utility corridor. Please see Figure 3. While the Preferred Alignment is not the least expensive, it is shorter than Alternatives 1 and 2, which results in fewer impacted landowners in the area. This pipeline alignment has been coordinated to coincide with existing and proposed utilities in the area. The potential for environmental impacts is minimized due, in part, to the decreased number of required ditch crossings. 3. Procedures, including reclamation measures, landscaping, buffering techniques or multiple uses, to be employed in efforts to mitigate any adverse impacts: To preserve existing scenic views and the pastoral nature of the area the pipeline will be laid underground, construction of alluvial wells will be at or below grade, 99-acres of grassland riparian habitat will be preserved, and creation of an additional 186-acres of short-grass prairie (at ARR facility) will occur. Disturbed areas will be re-vegetated to prairie-grass land,agricultural cover crop, or other suitable plant palette. Land management strategies to be employed during construction include weed management and establishment of a sorghum cover-crop. Post construction strategies include seeding, establishment, and maintenance of shrubs and short-grass prairie using NRCS recommended plants and seed mixes. 4. Size of anticipated work force, both temporary and permanent: During construction there will be approximately 20-30 persons on-site daily. Post construction there will be one full-time caretaker whose residence will be located at ARR Site A. Aurora anticipates that approximately four part-time employees will be using/accessing the site on a daily basis. In addition, Aurora will use contractors as-needed for land management, weed control and well and pump/motor maintenance. 5. A summary of the proposed water requirements, if any, to include the quantity and quality needed for each use, source, storage facilities, points of diversion, treatment system and distribution system: The only water requirement for the project is to maintain a domestic water supply to the two existing houses and associated outbuildings. There are two existing wells on-site which have historically supplied the two residences with their domestic water supply. Aurora will continue to use the wells to provide a domestic water supply to the two houses. Irrigation water is not required. PRAIRIE WATERS PROJECT Page 3 of 4 LEGEND i `�__,�� RIVERS AND CANALS :sill :-_may.11 ,:i; I FLOODPLAIN "j' IFLOOD WAY i` q0 ' `PI•ti -_rLOW PERMEABILITY BARRIER I � t�l 1 .PREFERRED �' =S �Tx• !' ARR PROPERTY UNE 1011:21 ��j ,.. N ALIGN NT 4411 d I 1:1\ o j.- 1 II� SECTION UNE MARKERS - Ali - - - - - I I - '1965 EX.CONTOURS It L JF, t I 13 - .241/4•-'-...241/4•-'-.. ' I. ye ri III• ALIGNMENTS ARR SITE A PROPOSED 36,. PREFERRED ALIGNMENT i 1r �£L�kRY r! I �i 'HALL II! ' • t r.. t $ � •i1_ niI9 • I. 9Q0 3y0; e '- �' • 0 `36, sG� _•.� — I I I ( PIPE SIZE(9N') �"'--r ^< c--------e-___,_) `_ Q ``\ t`, ) t ,uJ t PIPE MATERIAL U r ^ _� .I •, PVC LESS THANIEOUAL TO 24 INCH DIAMETER I .@.��✓1.; - t + itYNCLi _� STEEL GREATER THAN 24 INCH DIAMETER G tl - - t 4�i ‘, i -1- 1PREFEARE } °' • • ALIGNMEI I I •. Z. I �.,..\\ • I ` nr A.nt Y 9M 1 f Yn� jW �) M �i IRRIGATED AGRICULTURAL LAND 24 -- ` r.}.rj/ �" ' I — -:; - - - _ l`�. . '.2, �REFcRRED 0 Cy ALIGNMENT •L' 0 w , AI . elk � r • eo al. '•If I0 FLOOD HAZARD INFORMATION: f P r r Ili 1v.IJ Old. . oy. - iFi( ! PORTIONS OF THIS PROPERTY ARE LOCATED WITHIN THE 100YR. FLOODPLAIN F, fl L` pL4T� h '1-= FLOODPLAIN INFORMATION IS FROM FIRM FLOOD INSURANCE RATE _ I ---- AM - MAP, PANEL NO.080266 0981 C. DATED SEPT. 28, 1982, AND PANEL NO. • o ..;t-• WCR 6 ►- 1`.. 080266 0983 C, DATED SEPT. 28, 1982. - -` ;;) ;/� ' . t %•__,,-%. `+r + ` FLOODWAY INFORMATION IS FROM FLOODWAY FLOOD BOUNDARY r! le."-;-.14`111 1 • % b L I ! I k AND FLOODWAY MAP WELD COUNTY, COLORADO (UNINCORPORATED • r' IL-�� ' �� I 1 S. �.. „�� - ill • l AREAS) PANEL 12 OF 14 COMMUNITY PANEL NUMBER 080266 0012, — -Ira ; .. _ 3, •J DATED SEPTEMBER 28, 1990. itt.)0 ..,,.di . k . ti, t se.c I I • t; ,- Jr-Li , 'r I o . f% ID , BASEMA� A`�- a , INFORMATION: ( PREFERRED I 16 ,ILIr,'i i;� I. ALIGNMENT • -b' _ • THE BASEMAP INFORMATION WAS COMPILED WITH SURVEY - I} 7 L 6 f �� r- —_ t ice^ INFORMATION PREPARED BY: •4 i tT!_�S t !+t 'i.. , il: ,} r I I • II 0: .. 1Rq � FARNSWORTH GROUP , ,I � •• J��. • `P� 8055E TUFTS AVENUE SUITE 850 j 1 , , - •N. • , o" I DENVER, CO 80237 II ° • k i 't ,jI (303) 692.8838 -EFERRED --,, '•N•�! I P 1 ` I TOPO WAS GENERATED FROM FARNSWORTH AERIAL PHOTO. IGNMENT ' I I' • I '• ' 1 I / r :fl 1''• I 1 ; - c. : I - UTIUTY INFORMATION: -.)°' � f' " �. ~�r r UTILITY INFORMATION WAS PROVIDED BY BUCKEYE, DUKE ENERGY, ' • LP 1; f KERR MCGEE, XCEL, ENCANA, KP KAUFFMAN, OWEST, AND TODD ;%L-, i...,.€2,- . .�' • 4 r CREEK. �. ' fit - I PREFERRED "• d 'Th'i;(' i :,4 ..,_; ALIGNMENT? u `D 1'I.ttttt _l . i'I OIL AND GAS LINE LOCATIONS HAVE NOT BEEN FIELD VERIFIED. ( ALIGNMENT/ r V2.—o I I .-., , p�J,Q I I `I //: •n NOTE PREFERRED P G, / . F .... Jai\ STING I /i ✓''� o 'ri's'ALIGNMENT . SE URRY WALL I i` ,...A.,01,1,- .., t _ I _ • R � � -�' ° / ALL COMPONENTS OF THIS PROJECT ARE LOCATED OUTSIDE FORT • / 4 L � 'fAr4ft°3 y'L• 4 r f�l LUPTON'S ADOPTED URBAN GROWTH BOUNDARY it. V �,$`r ' ''" ' I ek}/ I ty ,e _ _ ��, z J WALKER 461F LAND CITY OF BRIGHTON DESIGN :COMPREHENSIVE PLAN I RESERVOIF4 -t / J BRIGHTON URBAN GROWTH BOUNDARY LO _• • T Ns --- • r 168TH ST. (BASELINE RD.) NO" ,' -Ii• ., 7it1� T i S RURAL RESIDENTIAL I I ij, , i • . AGRICULTURAL I 4 \cs ; .. ....._.. .„ ., _ ____ ....„ . ........._ _, f: i• _ ,.. .. 1 - J LAti i. It - y. . . 1- BRIGHTON COMPREHENSIVE PLAN DESIGNATIONS EAST OF THE • ,1„,71=4 J •- / ;{r' al, II '. SOUTH PLATTE RIVER ARE NOT SHOWN AS THIS IS OUTSIDE THE 1 .'S . IF . - 1.--%,— /' • ,,i.. TI Ft . PROJECT AREA. y s '�"� I •z T+ 2. BRIGHTON URBAN GROWTH BOUNDARY IS PER THE WELD COUNTY ta. Q 1 (1 ; _t �` URBAN GROWTH BOUNDARY & INTER GOVERNMENTAL MAP ti - L )/ II ly,' PRODUCED BY WELD COUNTY PLANNING SERVICES, JULY 2005 • ARR T B tucsnN 4 'r THE PRAIRIE WATERS PROJECT IS ENTIRELY OUTSIDE FT. ` SOUTIt --- 1 1 3. CLIFTON'S URBAN GROWTH BOUNDARY. a HIGHvan'r I' -� ) — , ;• I i� . : ` • t �"airs, i IRRIGATED AGRICULTURAL LAND IDENTIFIED THROUGH REVIEW OF �' I l fi • ;I I 4. DIGITAL GLOBE SATELLITE IMAGERY COLLECTED ON OCTOBER 25, E I ,V I /1‘,... 1 fi.�� t 'I 2004. �j 1 f 7t., - Vl r.JJ S I /,' /� I I. / � CI ( ' Illit rz_ _ .,.. X I • is 9 ICI. � �_ .-` j$]2 I 6 8 1 K (� TETRATECH RMC t iw l ,y J 900 s w , ST. AIR I_r rao laIONt, CO eosot 9 ® 1Nayik mai AURORA WATERca I&RO'C• § North NO REVISION DATE BY "' r'•"" iii 0 500 1000 200O — _ vnwrCr.ILIMIr* * PRAIRIE HAVERS PROJECT WELD COUNTY c. SCALE: I"=IQQQ' PREFERRED PIPELINE ALIGNMENT . ''` RNH 3/06 4X' I'=2000' 8 m-•.u.1 _ I 19.04"76.039.AM I'"w• 3 OF 3 s SUMMARY STATEMENT WELD COUNTY USR 6. A summary of proposed fuel requirements, if any, to include the type and quantity needed, source, and storage facilities: There may be fuel stored on-site for maintenance vehicles (less than or equal to 500-gallons). Aurora will hire a contractor to re-fill the fuel tanks, as needed. The fuel storage vessels will meet all applicable Federal,State and local regulations. In addition, Aurora will ensure that this area is fully compliant with the Spill Prevention, Containment and Countermeasure Plan requirements under the Oil Pollution Prevention regulation at Title 40 of the Code of Federal Regulations, Part 112, (40 CFR 112). 7. A description of the location and method of disposal of all forms of waste: Aurora has developed a Voluntary Clean Up Plan (VCUP) and a Waste Handling Plan. These documents describe the location and method of disposal for all wastes encountered at ARR Site A. PRAIRIE WATERS PROJECT � �� . m�_Page 4 of 4 USR QUESTIONNAIRE WELD COUNTY USR SITE SPECIFIC DEVELOPMENT PLAN AND USE BY SPECIAL REVIEW (USR) QUESTIONNAIRE This Special Use Questionnaire is intended to satisfy the Weld County requirements for a Use by Special Review Application. 1. Explain,in detail,the proposed use of the property. The Prairie Waters Project is a water resources project that will ensure the agricultural character of the area will be preserved while allowing the City of Aurora to: • Divert water from the South Platte River through two alluvial well fields adjacent to the South Platte River,north and south of WCR 6 (Figure 1); • Naturally purify the water at the 393-acre aquifer recharge and recovery (ARR) site located near the intersection of WCR 23 and WCR 8; • Collect and deliver the water from alluvial wells to the ARR site through approximately 9.5 miles of water pipeline corridors (see Figure 6 for pipeline corridor locations); and • Store water to augment depletions in the South Platte River and provide operational flexibility with the water storage rights in Walker Reservoir located west of the South Platte River just north of Baseline Road (168th Street). Aurora is requesting that upon completion of the mining and reclamation activities at Walker Reservoir, that the Prairie Waters Project USR may be administratively amended by plat to include Walker Reservoir. As described in the Project Need Statement, the portion of the Prairie Waters Project located in Weld County is part of a larger water supply project for the City of Aurora. The project capitalizes on existing water rights that Aurora can use to extinction, including trans-basin water from the Colorado and Arkansas River, non-tributary groundwater, and reusable lawn irrigation return flows. This fully consumable water supply is treated and discharged at the Denver Metro Wastewater Treatment Plant and Sand Creek Wastewater Reclamation Plant, and delivered to the South Platte River. Aurora's average annual fully consumable supplies available from its existing raw water system are approximately 40,000 acre-feet (35.7 million gallons per day (MGD)). In the year 2010, approximately 26,800 acre-feet (23.9 MGD) of Aurora's existing fully consumable supplies will be committed to other agricultural, municipal, and industrial uses on an annual basis —leaving approximately 13,200 acre-feet (11.8 MGD) available for diversion from the South Platte River in the year 2010 for the Prairie Waters Project. The Prairie Waters Project consists of the following elements (Figure 2): Alluvial Wells: A series of alluvial wells located along the west side of the South Platte River between Baseline Road (168th Street) and WCR 10 will divert the City's existing water rights. These wells will be placed 150 to 800 feet from the river to avoid PRAIRIE WATERS PROJECT Page 1 of 13 DIVERSION FROM ALLUVIAL WELLS FIGURE 1 WELD COUNTY _____Aliblibit-- .- c . ` " Prairie Waters Project lia r ,. t 4 veto Arra et 0 . . i VVV Y- '=L 1 Or Water Resources sr It . ---._ _ 'idargr- r�. ' { :. �• ✓• Features s - k..., • • , j. . , , ,t A , AQUIFER - •--�"� c RECHARGE J ti ' =, � �� •• , WC �` AND RECOVERY - - - - � ' it ' L r 4 _ = LOW I PERMEABILITY • BARRIER j„ r,. • .--,,,- 7 • '',..,,,.; 7:-.. /'- . .a . I W c 'I fit- •_`t DIVERSION FROM W �_�'-� _ ALLUVIAL WELLS CI. -O '� s _ 4 . J �' N.- \ : lb r l 1 t > r Er rte ; •I _Al•„ � I � • 1 ,=, -•t A�r. WA L K E R .-- r- - - t RESERVOIR A IP\-, e .4-4:14,-,,•L tom-' ^ '� ,L --� -r- -41 . , ,, :Z Reservoir 'J ,i ts r . r Y . r I 4 . ..A p. - W 1oS . . O. 1 ,'1,—,Ciine:R'c 'c ' . I -1 AI- �. r �• -loitt - -- -- ;: pi - - e. FIGURE 2 PRAIRIE WATERS PROJECT OVERVIEW North Campus Prairie Waters Project Schematic Proposed Well Feld _ 41,11 North ra -)P_H Campus tI Pumping , Proposed Pipeline Route Station 1 ------- Alternate Alignments South E-470 Easement Platte J� ? River a. P Proposed' Prot.- Pipeline Well Field 68R ARR Route `, E410tom. . , lit Lake Brant Pipeline IG' 7 ( / / Dit Brighton -Ditty 4� Ba681f19 F 0 Weld County 1 I.. Adam Cou nty unty 1\ , Pumping �? { go . \ Denver Station 1 \ International Pumping Airport Station 2 ' tr , X70 --- v__ d B Easement Conveyance System • T cal : Lt.. Trenchless Crossings co Aurora Reservoir WPF (34-mile pipeline betweenLI Be •41 Conveyance North Campus and ARWPF) f 1 Pipeline •0 Segment 3 � {_ ry D L Wemlinger ISP! -- I Blending {� _ Pipeline Pipeline S. Y Alignment 26th Avenue = -4—Access Road C - Storm Drain - ■ Bypass NW Extension —" Pumping Pumping Flow r _' 5tation 3 Control Center cr © Aurora u t . Reservoir _ s-- � c New 7 I _ � s Water Park Entrance th...cv Wemlinger Station Modifications E ? I Purification � Facilities " ? k t C,3 (A-WPF) O - D 1 L Wemlinaer g � ; I Blending C A Pipeline Aurora k 'eservoir e. 4 - C -- Executive Summary - Map 1-6 Aurora Water Capital Projects Division USR QUESTIONNAIRE WELD COUNTY USR jurisdictional wetlands and provide water quality improvements through natural purification processes involving filtration and biological degradation. This process is known as riverbank filtration (RBF). All of the wells will be permitted in accordance with statutes in the Colorado Water Rights and Administration Act and operated in accordance with Water Court decrees in a manner that protects senior vested water rights. North Campus Conveyance Pipelines: A series of conveyance pipelines will transfer the water collected by alluvial wells to two ARR sites for additional purification in protected recharge areas. Aquifer Recharge and Recovery (ARR sites): Additional water quality improvements will be achieved in the ARR sites through more travel time in the alluvial sands and gravels and through biological degradation of the compounds remaining after riverbank filtration (RBF). The ARR sites consist of three principal components—a low permeability barrier (LPB),infiltration basins,and recovery wells. Walker Reservoir: Upon completion of the sand and gravel mining, reclamation activities, and release of the Division of Minerals and Geology (DMG) permit, Walker Reservoir will provide augmentation and operational storage for the Prairie Waters Project. Conveyance Pipeline and Pump Stations. The water extracted from the ARR sites will be delivered to Pump Station No. 1 in Adams County, and pumped through two additional pumping stations and approximately 34-miles of pipeline for final treatment at the Aurora Reservoir Water Purification Facility (located just north of Aurora Reservoir,in Aurora). The system, when fully developed, will have a peak capacity of approximately 34 million gallons per day (mgd), pumped from the alluvial wells to the ARR sites (located in Weld and Adams County). A maximum of 45 wells will be installed in Weld County in order to achieve capacity. The ARR sites provide additional travel time in the natural sands and gravels, further enhancing the water quality of this supply through additional natural purification and filtration. The project has been designed to integrate into the existing surrounding agricultural, residential and gravel mining land uses as well as future agricultural, residential and open space land uses. The combination of these various elements comprises a cost-effective and environmentally friendly approach to purifying and delivering Aurora's water rights from the South Platte River. The Natural Treatment Process The pumping of alluvial wells provides an important first step in the natural purification processes through RBF. RBF is a natural process in which water is pumped from alluvial wells along a river, forcing water to infiltrate through the natural sands and gravels along the river. The natural purification processes include filtration and biological degradation. With the exception of pathogens and turbidity, the concentration of all regulated compounds in the PRAIRIE WATERS PROJECT Page 2 of 13 USR QUESTIONNAIRE WELD COUNTY USR South Platte River is already below the regulated levels for drinking water, so the first step reduces the concentration of the remaining trace organic chemicals to levels frequently below detection levels (in some cases,parts per trillion). The biological process is responsible for degradation of total organic carbon (TOC), nutrients such as nitrate, and a wide range of organic micro-pollutants. Biological degradation occurs naturally within the alluvial sands and gravels. RBF has been used on public drinking water in Europe for more than 100 years, and in the U.S. for more than 50 years. It is a natural and sustainable process that avoids the use of energy intensive systems such as reverse osmosis, and reduces the chemicals and power required to purify this water supply. More detailed explanations of the individual project elements are discussed in the following paragraphs: Alluvial Wells: The water supply for the Prairie Waters Project is comprised of existing water rights owned by Aurora in the South Platte River. The water will be diverted from the river by alluvial wells located approximately 150 to 800 feet from the river. The wells will be provided with submersible pumps and pitless well head adaptors to extract Aurora's water rights in the South Platte River. A below-grade metering vault will be located near each well head. An above- grade weather proof electrical control cabinet (approximate dimensions 4'H x 4'W x 3' D) will be located adjacent to each vault. The below-grade vaults and electrical control cabinets will be located within the 100-year floodplain. However the electrical control cabinet located adjacent to each well will be set at an elevation one foot above the 100-year base flood elevation to minimize the potential for water damage. The maximum design capacity of each well will be approximately 200 to 600 gallons per minute (gpm). Operation of the alluvial wells will result in the lowering of the water table (drawdown) around the well and diversion of water from the river. The Prairie Waters Project has been designed to mitigate impacts to the alluvial ground water system. The alluvial wells are located between the river and existing or planned gravel mines. The locations of the wells have been sited in consultation with the gravel companies and their locations are compatible with their mine plans. All wells will be operated in accordance with approved permits issued by the Colorado Division of Water Resources and Court Decrees issued in Division 1 Water Court. A groundwater monitoring program will be utilized to develop base line water level data and to monitor future changes in ground water levels. Monitoring wells will be installed at each alluvial well between the well and the river. Water level data presently being collected from an alluvial pilot test well near County Road 2 and the South Platte River indicates that drawdown is limited to a radius around the well of about 200 feet. Given that most of the alluvial wells are located between gravel mines and the river; existing wells will not be adversely impacted by the pumping of the alluvial wells. The limited radius of the drawdown will also minimize impacts to vegetation. However, as the potential exists for impacts to vegetation, a groundwater mitigation plan has been prepared. North Campus Collection and Distribution Pipelines: PRAIRIE WATERS PROJECT Page 3 of 13 USR QUESTIONNAIRE WELD COUNTY USR Water is conveyed from the northern well field (alluvial wells located north of WCR 6) to the ARR Site A in Weld County through a buried transmission pipeline that parallels WCR 8. As pipeline easements and documentation showing evidence of "Legal Right to Enter" are secured for the southern well field (alluvial wells located south of WCR 6), the piping from the southern well field will extend west connecting to the main north/south pipeline where water can flow to the ARR sites, or to the Pump Station No. 1 (located just north of Highway 7 in Adams County). The average depth of burial of the pipe is 5 to 6 feet. Cathodic protection will be installed along the conveyance system, along with blow-off valves at appropriate low lying areas and air relief valves at high points. Aquifer Recharge and Recovery (ARR) Sites: As previously described, RBF is the first step in the natural purification system. After water is pumped from the alluvial wells, the natural treatment will continue at the ARR sites, where the benefits of the biodegradation process will continue to provide purification as it migrates through the ARR sites. As shown on Figure 3, the ARR sites are located on lands owned or under contract by Aurora in Weld County (ARR Site A, east of WCR 23, and north and south of WCR 8) and in Adams County (ARR Site B, north of Highway 7 and on the east and west side of Tucson Street). ARR Site A is 393-acres in size, and includes two existing houses and several outbuildings located on the ARR Site A property. The design intent is to use existing structures where possible to preclude the need to construct new buildings. One of the homes and its associated outbuildings will be used as a caretaker's residence,a control house, office space and storage and servicing of maintenance vehicles. The three principal components of ARR Site A are the low permeable barrier (LPB), infiltration basins, and recovery wells. The LPB will be constructed to contain the water and isolate the naturally purified water from the surrounding alluvial aquifer. It is constructed by excavating a narrow (less than 4-foot wide) trench through the alluvial aquifer (a depth of approximately 50 feet) and backfilling the trench with a clay or cement grout. The LPB will cross Weld County Road 8 in two locations. In these areas the LPB is constructed with grout to provide a stable surface for the road. At the ARR Site A (Figure 4),water from the northern and southern well fields will be delivered to four infiltration basins within the LPB. The largest basin is approximately 30-acres. The other three basins are approximately 11-acres each. Each basin is subdivided into three cells. The basin sizing is based on the assumption that the ARR site will operate at a maximum rate of 21 MGD with an infiltration rate of approximately 3 to 6 feet per day. Basin depths range between approximately 5 and 10 feet. Water enters each ARR site through a below-grade vault, where flow rate and pressure will be measured. Then piping will branch off to feed each of the infiltration cells. Typically one cell will operate at a time. Depending on the actual infiltration rates and desired capacity from the ARR site, one or more cells could be "active" simultaneously, meaning they are receiving water. It is expected that some silt, clay and algae may accumulate in the infiltration basins, and periodic drying and removal of the material may be required. Recovery wells are located between basins and adjacent to the LPB (Figure 4). Similar to the alluvial wells, the recovery wells will be equipped with submersible pumps and pitless well PRAIRIE WATERS PROJECT Page 4 of 13 -,, r. t FIGURE 3 •••08" . l‘ - PRAIRIE r r� -,�itiA• 'k If WATERS � s PROJECT k , �` • rf_r • ti !.... . „ Overview f rt « C • a - • III r J . T 1 • C K cm .x,11 t t : 7' i} :yr�, f4. - 1 f . . . •1 , l( O _ ti .T :ea., -a • i 4 , ,, _ _ i. ,..\:\:.\-‘, ClA ' \\\ r • ,.,_ ._ , , . . , . • .... . . ... .. __f • eq w - i`s$ . qtr-:c�.t c�-5�i~ctitnc' Koi.1� .{'Ayr i - . t irr-ei ,o, - t • y1 -f • - e'en. h 5: . . . ici V. t. # =`t ;: ,.-Ti1 . \ L,n 41: all $ I. On©tux Marcus Rendering,intended fin illustrative purpose only H LI) LID Li. ta Lol wrig ..c 2-` It i kiswesessit: eat . • tiel'. 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V w \ Q ,. �: 2 Vu . ,t . ,1 .I o . < . „....,..„.0 ) - . / rs 1r.:44 • tlit LOI----�`` lit •. i .." /..-.. ,,.., ...T.,;•., , - . _ 4: I\ I. 114 '• SA j 1 41": :,. .:,", I ‘.' \\\ .• -til ) .---.--...-P....... IS.t.‘ i a ',or i L.44 Ili' I ill 41Iti- ' k II \IIIISIIICts.....4. . . . 414t/e Tom' 'mil i. alitie: 1..11 - _ ....:-- r oat it ` IN t 4se....N./ i .11: N. '\ . f • e - ..,e7.., di 0 T. ..\\ //se da; ' .. r . Ns 7 N pm . _ . . . . ... % . __ ... a. - \___ . . ... III t \ ) 1 j - _� 7 USR QUESTIONNAIRE WELD COUNTY USR head adaptors. An above grade weather proof cabinet will be located adjacent to each well to house electrical controls. The recovery wells are located within the LPB, and will not affect the regional groundwater system or operation of existing wells. However, the potential exists for localized mounding and shadow effects from the LPB. Computer modeling of ground water at the ARR site has shown that mounding will be approximately one foot on the up gradient side of the site and drawdown of two feet or less on the down gradient side of the site (shadow zone) may be experienced. A ground water monitoring program will be utilized to develop base line water level data and to monitor future changes in ground water levels. Monitoring wells have been installed around the ARR site. Existing monitoring data near the ARR site indicates that the ground water levels under existing conditions fluctuate about 2-7 feet during the year. Water levels are highest in the summer and lowest in the late winter and early spring. As indicated above, the mounding and shadow effects of the ARR facility are predicted to be less than this range. Potential mounding and shadow effects will be addressed by a monitoring and mitigation plan. Walker Reservoir: The water storage rights in Walker Reservoir are owned by Aurora. This site is currently being mined by Hall-Irwin, with the end use as water storage (USR No. 1172). Since the mining and reclamation activities are not complete at this site, Walker Reservoir is not formally included in this application. However, Aurora is requesting that upon completion of the mining and reclamation activities at Walker Reservoir, that the Prairie Waters Project USR may be administratively amended by plat to include Walker Reservoir. Upon completion of the sand and gravel mining and reclamation activities and release of the Division of Minerals and Geology (DMG) permit, Walker Reservoir will provide augmentation and operational storage for the Prairie Waters Project. Aurora will use the existing pump station located on the east side of Walker Reservoir to pump water from Walker Reservoir to the South Platte River for augmentation purposes. Prior to completion of mining and reclamation by Hall-Irwin, Aurora will provide augmentation using water rights owned by the City that will be available as in-stream flows within the South Platte River. Pilot Study: In April 2006, in order to advance the design activities for Aurora's Prairie Waters Project and obtain the information necessary to complete this Use by Special Review application to Weld County, Aurora received approval from the Board of County Commissioners to conduct a pilot study at ARR Site A. The pilot study consists of an infiltration test and operation of a pilot scale water treatment plant (Figure 5). Over the past two months the pilot study has provided essential data relative to aquifer characteristics and project design. A summary of the pilot study technical data is provided with this application. 2. Explain how this proposal is consistent with the intent of the Weld County Code, Chapter 22. The Weld County Comprehensive Plan is a document that serves as the foundation of all land use and development regulations in the County,with the intent of providing a framework to be used by County government to manage growth. The proposed project delivers water to Aurora PRAIRIE WATERS PROJECT Page 5 of 13 FIGURE 5 WELD COUNTY Pilot Study r, ?, .. "• :t .1• • I. a --c: '0`.;0 a y�rq II 1_ li. • . . . \ il).• •‘'' N• •• 11 .:1.2. 71PS ' tr I -.art .` "' Weld Pilot Site . County Study t. r-,� ` �, / ' Illa* Alonitorinc = , , 1 LLB 1 s vYP�tS Y' v ( f `i r ' util' .{al ill? 4Z r ` • I J '4 Test Infiltration t+ ' ( z ` A �' Basin " ti:-.. , J '` • . - ' •4 Dewatennq -_t r 1 Wells ,}Se ,_ it �� ' ,\e'L Pilot Water a.- �'� . . r Commits 11%, , I Treatment �- �,�. :. ms`s m — Plan' y ," �,. \. , r. .... „ tiS1.74—i �dr 1\1:::., 7- t\I , \ . , 4 ./ Ibort fl � � � . S ,\\L \'V<C. K 3 ti`�_ f� , ' fob i• h; • r ti x 4. ,, ``� - \�I Existing Water Supply Well _ • _ _ a ' \ Prairie Waters Project Property (owned by Aurora ) '' . ' L ;. ..• ;r, 4. J USR QUESTIONNAIRE WELD COUNTY USR and will not result in growth within Weld County. Rather, it will allow Aurora to fully reclaim water they already own and make multiple uses of it. As such, Aurora is requesting Use by Special Review approval for the initial phase of a water infrastructure project that will help Aurora improve system reliability and meet existing and future water demands. In providing an explanation as to how this proposal is consistent with the intent of the Comprehensive Plan, it is important to address the five (5) articles that include: General Provisions, Land Use Categories, Land Use Amenities, Environmental Resources and Natural Resources. The following discussions focus on how this proposal is consistent with the intent of the above referenced articles. Article I-General Provisions The following Guiding Principles establish the philosophical foundation of the Comprehensive Plan and help to clarify its intent. There are three relevant Principles as follows: A. Private Property Rights. Aurora has purchased the properties for ARR Site A in order to provide a reliable water supply to its residents. The property for ARR Site A was acquired through good-faith negotiations with the land owners. Aurora also purchased the water storage rights in Walker Reservoir from Central Colorado Water Conservancy District. Additionally, Aurora has commenced negotiations with land owners and has obtained agreements which allow it to continue investigative activities for the pipelines and well fields. Aurora will continue to coordinate with individual landowners to ensure that the pipeline location meets with their approval. This project is being developed in a manner that is respectful of private property rights. B. Respect for Agricultural Tradition. This application does not involve the conversion of agricultural lands to urban uses which require new or additional infrastructure and services. All components of the Prairie Waters Project, including the buried transmission pipeline, well fields, ARR Site A, accessory structures and the existing house and outbuildings at ARR Site A which will be used as a caretaker's residence and control house, are low impact, passive uses that complement the agricultural setting and zone designation. The pipeline alignment is generally located parallel to section lines and therefore adjacent to existing Weld County road rights-of-way. In areas where the pipeline alignment does not parallel section lines, Aurora has worked in cooperation with area landowners to locate the pipeline to preferred alignments through their property. The result is the City's preferred pipeline alignment shown in Figure 6. This alignment provides the opportunity to coordinate with existing and future utility providers and limits the potential for environmental impacts by reducing the number of ditch crossings. The well fields are located in areas where gravel mining is underway or will occur in the future, thereby minimizing potential impacts to existing agricultural lands. Aurora's decision to use the existing residence at ARR Site A for the caretaker's residence and control house means the majority of the ARR site will PRAIRIE WATERS PROJECT Page 6 of 13 LEGEND - • - '2 .1- - (1*1r .:- • . -` • ` - - - - - - -- y ••• V! - RIVERS AND CANALS I • rte' „r - tr....tha .'I FLOODPLAIN �I r17::1'.:1"14:4 ,t .�� Fii � , -- . FLOOD WAY I} .r 1 ' r� T [ '`�,fl J '. `-I LOW PERMEABILITY BARRIER 1 r� •a /r �:,I li PREFERRED r �� l i o �� ARR PROPERTY LINE 1 i . • �� Y , _ L. +... ALIGNfvgNT - 1 �I� Li SECTION LINE MARKERS • rti / C(J1L' I ! I� r' w. + I „ -• �MI - - - - - - EX.CONTOURS / till* 1.,0 ' i P I IIiI 3 �'g - / �--_ f ,: s - . ALIGNMENTS • 8 ARR SITE A rRDI'OseD "Pi., •r' �• � �F PREFERRED ALIGNMENT siii2RRYI °1 41° LWekLL ,ifr s—; ,30 \- rt, .O o : i. 36 - 4 cr---) ,� ,�� 1 ,e � ,( � ,( PIPE SIZE(7N') ^ -• : • 11 ` 1 PIPE MATERIAL iiiiii‘iti. rY 1. .....• I PVC LESS THAN/EQUAL TO 24 INCH DIAMETER el I to o T _ 1,` 1 I` !! .sue r: } STEEL GREATER THAN 24 INCH DIAMETER l 9 It s- es, ' ELI 4 C5' F I YI' � le }; y :' 111 IF: , li , � JLk- < } - PREFERRE ` po\ 8 t. I t+,t}`, • • I - �� \ ALIGNMEP b 1•ill"��' L + 1 grGNN° • °�-° ' e . - /) >. 6 \tea` ` ' 1 IRRIGATED AGRICULTURAL LAND • -\ (� -r^ S-?RE�RREr r 7 4^-... , /At~IGNMENT I r-• 10• 1 II -,) . .:Illpis15 ?lila r ' ,, ' • FLOOD HAZARD INFORMATION: 1 i 1L rdi: `'• PORTIONS OF THIS PROPERTY ARE LOCATED WITHfN THE 100YR. :. '�t• FLOODPLAIN. al A •1 7 '�^- i' • g ` FLOODPLAIN INFORMATION IS FROM FIRM FLOOD INSURANCE RATE MAP, PANEL NO. 080266 0981 C. DATED SEPT. 28, 1982. AND PANEL NO. __ ,_ •9 , o: ; `3f\ • WCR 6 'S ` 080266 0983 C, DATED SEPT. 28, 1982. —• ss*� — = g" Fr FLOODWAY INFORMATION IS FROM FLOODWAY FLOOD BOUNDARY ) ,� 4,.^1?=,,,WI I, � *q��li 1 AND FLOODWAY MAP WELD COUNTY, COLORADO (UNINCORPORATED �;r ) _ _,j' ` Ffj)" I AREAS) PANEL 12 OF 14 COMMUNITY PANEL NUMBER 080266 0012. -;11, .. _ L. -•- . ' DATED SEPTEMBER 28, 1990. Kf I f' I. "l 1IF `` BABEMAP AND TOPOGRAPHIC i' /• :>r r INFORMATION: c .T 1 s ' • L ` 'r � NI 1 THE BASEMAP INFORMATION WAS COMPILED WITH SURVEY i a��l._' - — A�A r I , — -ai ,, r— INFORMATION PREPARED BY: �. ° $ T ./ I FARNSWORTH GROUP , '� �' �f3 : 8055E TUFTS AVENUE SUITE 850 AP:' y 4 I ri jl 1 DENVER, CO 80237 I (303)692-8838 t I. )itIMENT RRED ' TOPO WAS GENERATED FROM FARNSWORTH AERIAL PHOTO. . I,� r #• bh i -• ?ix( c„:. . - 1-p., Ic 4k. �. { • • .�� it. je t 5 .,�i ., . •I L UTILITY INFORMATION: - _ ,. '�E n 1 ` ' •' - P UTILITY INFORMATION WAS PROVIDED BY BUCKEYE, DUKE ENERGY, / 3d •f'f12•r,4• KERR MCGEE, XCEL, ENCANA, KP KAUFFMAN, OWEST, AND TODD i }! i4,..I 1 CREEK. PREFERRED) .1. - ALIGNMENT 1,` I , ;I� I OIL AND GAS LINE LOCATIONS HAVE NOT BEEN FIELD VERIFIED. �� ?` _ I:CI3( � ✓ - . . 124_-:,--1' PREFERRED EXISTING I r • > ' '?VII y i ALIGNMENT 36 SLURRY WALL I• ref Jp. I N 'A k ` 31 ALL COMPONENTS OF THIS PROJECT ARE LOCATED OUTSIDE FORT �' � fr/� ; LUPTON'S ADOPTED URBAN GROWTH BOUNDARY �, / I • r./r/�`7s °t f~ k1i, I 04/\ , G I,I J iI CC o WALKER I 4' ' r z ' ,. _P 4E CITY OF BRIGHTON COMPREHENSIVE PLAN i n � RESERVOIR 1 ./ } • 'y 1 �: LAND USE DESIGNATIONS: 7.eL c J ki 1fr� T r it BRIGHTON URBAN GROWTH BOUNDARY ,; It f , - i•,t'' w 7,' _ _ TI N J .ti.ro i 168TH ST. (BASELINE RD.) i!i T 1 S RURAL RESIDENTIAL ci' 1 Ir+ .tit -.il' ' III. i . . It AGRICULTURAL 2 :, Y )ra, NOTE: I J, 1 ��yy�� a� �i 1. BRIGHTON COMPREHENSIVE PLAN DESIGNATIONS EAST OF THE .' fr -(1 ,' _.11 ,' SOUTH PLATTE RIVER ARE NOT SHOWN AS THIS IS OUTSIDE THE i''n',e . " ' iici .:*:_. PROJECT AREA ''A, ".1 .i 2. BRIGHTON URBAN GROWTH BOUNDARY IS PER THE WELD COUNTY J p J } t „ URBAN GROWTH BOUNDARY& INTER GOVERNMENTAL MAP �(I I PRODUCED BY WELD COUNTY PLANNING SERVICES, JULY 2005 a T • y� ��_-r § ARR . TUCSON </� '�+(,, THE PRAIRIE WATERS PROJECT IS ENTIRELY OUTSIDE FT. 't ;$OInH , ,'( 3. LUPTON'S URBAN GROWTH BOUNDARY. 8 HIGHWA+ T ..- 'tom-.• ,7 ') - • ,i.�! ------ _ .I'' ---,- _ t, lt• is IRRIGATED AGRICULTURAL LAND IDENTIFIED THROUGH REVIEW OF & ' jy I j+ I q. DIGITAL GLOBE SATELLITE IMAGERY COLLECTED ON OCTOBER 25, 5 - I G 'f_ , I i .: ! '., _ :::L.,,r-:.14X,e I I z i . . 'Ye.' . : 1 i:lw `I z i. a u .. $i cc 1 c TETRA TECH RMC 0 4141f Northval CV la •El. 303.772.5182 IdEM0 303465.6283 CM 303 Ed.'cm/. AURORA WATER o REVISION DATE St c•••,• �.,.<, n 0 507 10W 2000 I nrC,r_I R PRAIRIE HATERS PROJECT WELD COUNTY IT< 3 SCALE: I"=1OOO' PRE=EERRED °'PELINE ALIGNMENT 8 ij i. - • - """ etR.`-I I°"` 3/06 su: I"=2000' a c --glatECI r' r: 19.04 16.039.Ar `' ' 6 8 USR QUESTIONNAIRE WELD COUNTY USR be free from structures with no new aboveground construction. The ARR site design results in the preservation of approximately 99-acres of grass land and riparian corridor along the Lupton Bottom and Brighton Ditch and the creation of 186-acres of short-grass prairie, thereby providing an open space buffer of vegetation and wildlife habitat for the County. While the project involves very few structures, all architecture and landscaping will be designed to comply with Weld County's requirements, to fit into the rural character of the County, and to maintain the County's agricultural tradition. C. Recognition of Weld County's Diversity. Through the design of this project, Weld County's economic and geographic diversity were considered as potential cumulative impacts of the proposed project were evaluated. The Prairie Waters Project recognizes that mineral resource extraction is an essential industry in the County in the following ways: 1. Existing gravel resources will remain in place at ARR Site A, to be used for the natural purification process which will be occurring there. If Aurora decides to use other purification processes in the future, these gravel resources will remain available for mining. 2. The locations of the northern and southern well fields near the South Platte River and within its floodplain are adjacent to existing and proposed gravel mining operations. Aurora is cooperating with adjacent property owners involved in mineral extraction to insure that construction and operation of the well fields complements their current and future mining plans. Article II - Land Use Categories. The support of agriculture is a significant goal of Weld County. The applicant is not proposing a change in the agricultural zone district designation; rather, it is seeking a Use by Special Review to allow a water infrastructure project that is compatible with the surrounding low-density residential, agricultural and industrial land uses. Upon project completion, the landscape of ARR Site A will remain pastoral in nature, with native vegetation in place, thus providing a low-intensity land use which will be compatible with the surrounding land uses in the area. Article III - Land Use Amenities. The Prairie Waters Project will not result in the conversion of agricultural lands to urban uses where increased infrastructure and services are required. As such, there is not a significant change in the need for public facilities and services or transportation. The project does preserve 99-acres of existing riparian corridor and grassland at ARR Site A while creating an additional 186-acre of short grass prairie. In addition, Aurora is willing to explore the potential of multiple-use opportunities within the pipeline easements, for example additional utility corridors and future trail connections through ARR Site A. Article IV- Environmental Resources. As noted in the Comprehensive Plan, Section 22-4-10, "The condition of the environment has been of increasing concern for the residents of the entire nation PRAIRIE WATERS PROJECT Page 7 of 13 USR QUESTIONNAIRE WELD COUNTY USR and the County."Additionally, Section 22-4-10 recommends that Impacts for proposed land uses on air, water, waste, noise,and public should be considered. The Prairie Waters Project considers these items as follows: A. Air - The project will not have a negative impact on air quality. Of the 393-acres reserved for the ARR facility, 99-acres of riparian habitat and existing grassland will be preserved while 186-acres of short-grass prairie is created, thereby facilitating dust suppression. A Dust Abatement plan will be completed to address potential nuisance conditions such as dust throughout the construction phase of the project. B. Water — The Prairie Waters Project will not impact vested senior water rights. The Prairie Waters Project utilizes water supplies that have either been introduced to the South Platte River basin through transfers from the Colorado and Arkansas River basins or are the consumptive use portion of previously transferred rights. Thus, the city has the right to reuse such water. In addition, water stored in gravel pits will be used as an augmentation supply to ensure that Aurora's diversions from the South Platte do not interfere with vested senior water rights. Needless to say, the SEO will ensure that all rights are administered in priority. Aurora is conserving and efficiently managing this precious natural resource, thereby limiting the impacts associated with other water supply options, such as transbasin diversions or agricultural to urban transfers. Finally, consistent with Section 22.4-20, Water Quality, this project is a natural and sustainable process that avoids the use of energy intensive water treatment systems such as reverse osmosis, which produces environmentally damaging brine waste streams. C. Waste—There are no waste impacts from this project. As addressed in the Waste Handling Plan, no chemical or hazardous waste storage will be conducted on- site. Solid waste disposal pick up will be scheduled with a local waste management service in Weld County. D. Noise - There will be no negative impacts on noise levels. Noise levels will be in compliance with the Department of Public Health and Environment standards. E. Public Health - Based on the analysis above, there are no negative impacts on public health of County residents. Article V - Natural Resources This project respects the natural environment. The area in question includes flood plain, jurisdictional wetlands, and riparian areas. The Prairie Waters Project completely avoids threatened and endangered species, jurisdictional wetlands and other waters of the U.S. as encouraged in the Weld County Comprehensive Plan, Article IV, Section 22-4-10-D. The city coordinated with state and federal authorities, including the U.S. Fish and Wildlife Service (USFWS) and the Army Corps of Engineers (USACE), to not only avoid jurisdictional waters, but to ensure no PRAIRIE WATERS PROJECT Page 8 of 13 USR QUESTIONNAIRE WELD COUNTY USR harm to threatened and endangered species. Further, this project was designed to conserve critical ecosystem components, including wetlands and migration corridors consistent with Section 22-5-30 (A.W. Goal 1), Wildlife Goals as well as Section 22-5-30 (W. Policy 2.2) of the Comprehensive Plan wherein destruction of wetlands or riparian areas is strongly discouraged. In the City's coordination with both USACE and USFWS, both agencies have indicated that as long as the Prairie Waters Project is developed as described, then a 404 permit or Section 7 consultation will not be required. The project preserves existing scenic views and the pastoral nature of the area by laying pipeline underground, constructing alluvial wells at or below grade, preserving existing grassland and 99-acres of riparian habitat along the Lupton Bottom and Brighton Ditches and creating an additional 186-acres of short-grass prairie (at ARR facility). The proposed accessory aboveground facilities, such as the electrical control cabinets for the alluvial wells, will be screened by stands of trees and shrubs to maximize scenic resources consistent with Section 22-5-50 (E.O. Goal 5) of the Comprehensive Plan. In addition, an existing residence and associated outbuildings will be used for the caretaker residence and control-house outbuilding at ARR Site A. The view study of the Prairie Waters Project ARR Facility in Weld County is provided on Figure 7. As shown, the project design complements the agricultural Weld County setting. The Prairie Water Project conforms to Section 22-5-50 (2.O. Policy 1.2) of the Comprehensive Plan through mitigating potential visual impacts by strategically placing the northern and southern well fields in areas where gravel mining is occurring or will occur in the future, and by implementing rural architectural features in keeping with the surrounding agricultural and low density residential development in the area. 3. Explain how this proposal is consistent with the intent of the Weld County Code, Chapter 23, (Zoning)and the zone district in which it is located. Chapter 23 of the Weld County Code outlines general provisions, procedures and permits, and zone district designations. The proposed USR application is consistent with the general provisions and procedural requirements in Article II, Division 5, Special Review Permits for Major Facilities of Public Utility or Public Agency. The zoning of the subject property and all surrounding properties is A (Agricultural). Aurora appreciates that agriculture in the County is a valuable resource which must be protected from adverse impacts resulting from uncontrolled and undirected business, industrial and residential land uses. As such, this application does not propose business, industrial or new residential land uses. The proposal is consistent with the intent of Chapter 23 in that the majority of ARR Site A will be a short-grass prairie consistent with property's zone district designation of A (Agricultural). Although there will be accessory structures such as a caretaker residence and outbuilding control-house located outside the boundaries of the LPB, an existing residence and associated outbuildings will be used. The recovery wells and control vaults for the infiltration basin will be constructed at or below-grade, resulting in the preservation of scenic resources. PRAIRIE WATERS PROJECT Page 9 of 13 - i ;. _ �i -- •. " • •• • 'It •-i.e..'.Z•••. ` � t. . _ •• • �- is • ti all •IIII • II!! . .40 ...- I ,.•. . ` Tom . (ID 4 ( • • . v.� 4.4C44ii. • fir•, - '`'• f _ w y • ..r � ' _ _ ••.• - ;[ 1$ ; •i J _ . e .. r 1 ' • ~ r • " 1. i , t ‘ • ! • r. • • ` 'r • •t. • 1 + 4 ; t ` ♦, , - • t • a •• • • 4 t • • . ,, + ,, . • J ,. 117 k ,_ • • _ 1 ` IL ' • -S - � `.... � . S . % `r 1 I ti t �y k._ , _ ,...,„ , . , rt. ... a . - . • t '1,1 ,t •+ '1.. avid J l ; ter-, ..• _ ;‘,"i 'I , 4 ". r • • •/ Y l . ... :z•Ni.f..:. :4:____,_.....;_.,_:__,:.:::_. ..4 •.__.a•Ne:II • t 't 4 I1 j • r,Y , ll • -• • tle • NI., _ I 1 i • f • _` 441 r _ 1 tr I I ..I:I':: . • •r 4. 4. tSt • . %, • t x - i\ i .. f /� 12 fi +I( 4!",,i iiiibila lig; i �' .... - ._ , /4 In '•• . .. .. ,.• • •• ilb • (` ,y — _ • yy • • L 1 USR QUESTIONNAIRE WELD COUNTY USR 4. What types of uses surround the site? Explain how the proposed use is consistent and compatible with surrounding land uses. The types of uses surrounding ARR Site A include farming, low density single family residential, gravel mining, and oil and gas drilling. Aspects of the ARR Site A design, including Aurora's decision to use an existing residence and outbuilding to house the caretaker's residence and control house, combined with the low-intensity nature of the land use ensure that this aspect of the project will be compatible with the agricultural zone district in which it is located. The area around the northern and southern well fields are currently being used for agricultural purposes, but will be mined for sand and gravel in the near future. Aurora has coordinated with landowners in the area to ensure that the pipeline alignment is compatible with their existing or proposed land uses. 5. Describe, in detail, the following: A. How many people will use this site? Much of the facilities on site are underground and do not have exposure to the elements; thus reducing the number of people/employees needed on site. There will be a full-time caretaker whose residence will be located at ARR Site A. Additional operational and maintenance personnel will access the site. Aurora anticipates that approximately three other full-time employees and a couple of part-time employees will be using/accessing the site on a daily basis. In addition, Aurora will use contractors as-needed for land management, weed control and well and pump/motor maintenance. B. How many employees are proposed to be employed at this site? There will be one full-time employee on site daily, the Caretaker/Supervisor, and approximately four part-time employees. These employees may include: a Process Engineer, Equipment Operator, Laborer, Electrician or Water Resources Engineer. Land management, weed control and well and pump/motor maintenance will be provided by subcontractors on an as-needed basis. C. What are the hours of operation? The labor estimates provided above will be staffed during normal business hours, 8am to 5pm, with the exception of the caretaker, who will reside on-site. D. What type and how many structures will • D . be erected (built) on this site? - No new buildings will be ' 4, constructed on this site. At the ARR site there is an existing house (Photo at-1' 1) and several associated outbuildings (Photo 2) located outside the LPB. The existing home will be used as a caretaker's residence. The outbuildings will be used for storage and servicing of Photo 1 .Caretaker House PRAIRIE WATERS PROJECT Page 10 of 13 USR QUESTIONNAIRE WELD COUNTY USR maintenance equipment, office space and storage of the control equipment for the facilities. The caretaker house is located on Aurora's property (2876 Weld County Road 23). A caretaker will live in the home full-time. The home already has existing septic and water service. At the well fields there will be �• various electrical utility cabinets • . ' v • ? (approximate dimensions 4'H x 4'W x 3' D) to house electrical equipment to operate the wells. The utility cabinets are located adjacent to the vertical wells along the South Platte River and the recovery wells in the ARR facility. Photo 2. Typical outbuildings at Caretaker House E. What type and how many animals, if any, will be on this site? Upon construction completion, the site will serve to enhance wildlife habitat due to the cessation of grazing and agricultural production. Other than wildlife, there will not be any animals on the site. F. What kind (type, size, weight) of vehicles will access this site and how often? Day-to-day operation and maintenance activities on site will be headquartered at Pump Station 1, located in Adams County. There will be approximately two (2) pick-up trucks, one (1) backhoe/loader and one (1) electrician service vehicle that will access the site as necessary during normal business hours. Other vehicles, such as passenger vehicles will access the site on a day-to-day basis. Oil and gas company maintenance rigs and vehicles will continue to access the site on as as- needed basis. G. Who will provide fire protection to the site? Fire protection will be provided by the Fort Lupton Fire Protection District. H. What is the water source on the property? (Both domestic and irrigation). The two existing houses and outbuildings have existing water supplies from a pair of existing wells on-site. Irrigation water is not required. What is the sewage disposal system on the property? (Existing and proposed). Each of the existing houses have an existing individual sewage disposal system. It will be maintained per state and local requirements. No other system is anticipated to be needed. J. If storage or warehousing is proposed, what type of items will be stored? Maintenance equipment for the project will be stored and serviced in the outbuildings associated with the caretaker's residence. In addition there may be PRAIRIE WATERS PROJECT Page 11 of 13 USR QUESTIONNAIRE WELD COUNTY USR fuel storage and some chemical storage related to the equipment servicing operations. Aurora will ensure that these operations are fully compliant with the Spill Prevention, Containment and Countermeasure Plan requirements under Oil Pollution Prevention regulation at Title 40 of the Code of Federal Regulations, Part 112, (40 CFR 112) and any other pertinent Federal, State or local requirements. 6. Explain the proposed landscaping for the site. The landscaping plan is included in this application submittal under the Tab labeled Land Management & Weed Control Plan. As described in the plan, the long term landscape condition includes conservation of the existing riparian corridors through ARR Site A as well as some of the grasslands, establishment of a short-grass prairie over a large portion of the site and planting of other shrubs conducive to the Weld County agricultural setting. 7. Explain any proposed reclamation procedures when termination of the Use by Special Review activity occurs. If the use is terminated, then all above-ground structures will be removed, wells will be plugged and abandoned, and the sites will be restored to existing grade. Disturbed areas will be re-vegetated to prairie-grass land, agricultural cover crop, or other suitable plant palette. 8. Explain how the storm water drainage will be handled on the site. The attached drainage report provides details on the storm drainage specifics for the Weld County site. All drainage requirements are in accordance with Weld County's requirements. 9. Explain how long it will take to construct this site and when construction and landscaping is scheduled to begin. An eighteen month construction period is anticipated (Table 1). All construction activities will be permitted in accordance with County and State requirements, including implementation of best management practices (BMPs) and MS4 requirements during and after construction at the site, right-of-way permits, traffic control plans, etc. Approximately 20-30 people will be on-site during construction including several construction managers/inspectors to insure quality construction, safety protocols, and regulatory requirements are implemented. Landscape management is a key component of the construction activities and will continue throughout the life of the project. The ARR site includes a 3-phased approach to landscaping as described in detail in this application under the Tab labeled "Land Management and Weed Control Plan". Weed control has commenced and will be implemented during all landscape phases. Landscape management phases are as follows: • Pre-Construction Landscape - Short-term during pilot study - Primary plant species-sorghum PRAIRIE WATERS PROJECT Page 12 of 13 USR QUESTIONNAIRE WELD COUNTY USR • Construction Landscape - Temporary, during construction - Primary plant species—sorghum and prairie grasses • Permanent Landscape (Post Construction) - Long-term,post-construction Table 1. Summary of Construction Activities and Schedule Duration in Weld County Estimated Estimated Start Anticipated Equipment on Activity Schedule Date Site Duration Install low permeable 3 months July 2007 2 Backhoes and a Bulldozer barrier Drill wells inside low Drill rig,backhoe, and a permeable barrier and 12 months August 2007 service truck install yard piping Earthwork/construct 12 months August 2007 Bulldozer and a backhoe infiltration basin Drill wells along South 8 months August 2007 Drill Rig Platte River Construct a pipe network from wells to ARR, ARR 18 months July 2007 2 Backhoes and 1 bulldozer to County Line Mowing and miscellaneous Landscape Management Ongoing May 2006 landscape equipment. 10. Explain where storage and/or stockpile of wastes will occur on this site. There will be limited fuel and chemical storage in the accessory buildings at the caretaker's residence to fuel and service maintenance equipment for the site. However, no chemical or hazardous waste storage or stockpile of wastes will occur at ARR Site A. Solid waste disposal pick up will be scheduled with a local waste management service in Weld County. Please refer to the Waste Handling included in this application for further details. PRAIRIE WATERS PROJECT Page 13 of 13 SITE SELECTION WELD COUNTY USR Introduction The following report provides a complete analysis of the site selection process for the following components of the Prairie Waters Project: • Aquifer Recharge and Recovery (ARR) Site A, • the Northern and Southern Well fields, and • Walker Reservoir. A separate document has been prepared that provides a complete alternatives analysis for the proposed pipeline network within Weld County. The site selection and alternatives analysis documents are consistent with the requirements outlined in Division 5 Special Review Permits for Major Facilities of a Public Utility or Public Agency, of the Weld County Code. Specifically, this report provides a description of the selection process as well as the analysis described in Section 23-2-330.D.2(a-i), 9 and 13 (a and b) of the Weld County Code for the ARR site, the well fields and Walker Reservoir. The Alternatives Analysis section describes the rationale for the preferred pipeline network using the analysis described in Section 23-2-330.D.2(a-i), 9 and 13 (a and b) of the Weld County Code. Provide a complete description of the facilities, including the source, capacity, destination and type of structures (§ 23-2-330.D. 1 ) An overview of the Prairie Waters Project is provided in the Project Need Statement and the project is described in much greater detail in the Use by Special Review (USR) Questionnaire. As described in the previous sections, Aurora has a vested interest in constructing the Prairie Waters Project as proposed since the city has acquired the land for the ARR facility and the water storage rights in Walker Reservoir. In addition, Aurora has approached each of the landowners affected by the pipeline alignments and well fields in order to secure access agreements to conduct investigative activities as well as demonstrate Aurora's interest in purchasing easements or, in the case of the wells, portions of their land in fee simple. A complete analysis of the alternative routes or sites considered, to include in each case (§ 23-2- 330.D.2): -; ; The responses provided below address both the requirements of the section listed above as well shah.,' . as § 23-2-330.D.3 since this report addresses site .4 ' selection for ARR Site A, well fields and Walker Reservoir. ma- a. Reasons for Consideration (§ 23-2- 330.D.2.a) ARR Site A Photo 1. Existing residence to be used as the caretaker's Aurora evaluated several options to residence. purify the return flows diverted from PRAIRIE WATERS PROJECT Page 1 of 8 SITE SELECTION WELD COUNTY USR the South Platte alluvium. These options included: mechanical pretreatment, riverbank filtration (RBF), and ARR. Having considered a variety of factors, including mechanical treatment technologies, existing and needed water quality, as well as public perception and permitting issues - the decision was made to pursue RBF in combination with ARR as the preferred pretreatment technology. RBF and ARR are natural treatment processes that are recognized by the US EPA. More importantly, they avoid the environmental impacts of other treatment options by reducing power and chemical usage and avoiding the production of the brine waste stream that is associated with a reverse osmosis (RO) treatment process. The disposal of such a waste stream can prove quite problematic. The majority of the proposed ARR facility is located at the northeast corner of the intersection of WCR 8 and WCR 23. A small portion of the site is located on the south side of WCR 8 and east of WCR 23. This 393-acre site is in an area underlain with sand and gravels, a site attribute, which is critical to the proposed use. In addition, the site's size and proximity to the South Platte River are other important factors governing this site selection. Figure 1 is a site plan of c_ the ARR facility. The facility includes r' y� r" :: • - , ' J :: ,, four infiltration basins, which will look A0 like shallow ponds, recovery wells and an existing house and outbuildings which will be kept and used as the caretaker's residence, control house and maintenance and storage facility for incidental equipment used at ARR Site A. Photo 1 shows a picture of the existing residence on the ARR site which will be used for the control Photo 2. Existing outbuildings to be used as the control house. Figure 2 provides a general house. detail of the recovery wells. Northern and Southern Well Fields Aurora evaluated several options to divert existing fully consumable water rights from the South Platte River. Some of the options evaluated included direct diversion utilizing excess capacity in existing ditches and alluvial wells. Considering the same factors as applied to ARR Site A, Aurora decided to utilize alluvial wells in order to get the purification benefits associated with RBF. The alluvial wells will be located in two well fields adjacent to the South Platte River. Both well fields are located between 150 and 800 feet of the west side of the South Platte River. The northern well field extends approximately one mile north of WCR 8 and one-half mile south of WCR 8. The southern well field is located between 168th Street (Baseline Road) and WCR 6. Walker Reservoir Aurora evaluated several options to store existing water rights diverted from the South Platte River and ditch shares owned by Aurora to be used for augmentation purposes. Augmentation storage is critical to ensuring that Aurora's withdrawals do not injure senior water rights on the South Platte River system. This will allow existing senior PRAIRIE WATERS PROJECT Page 2 of 8 0" C.,...) k• ill a al c X44! 3 2 ILI g 5 1 ` 1 - i. -' 1 n 0. 4. 0--' s 11 , ) am.. Z ACC4c r 81 J gill " Z ......i ti W $ r e el - a- __I ICI • ....., • . Py •• ;t w 0 Li till IllicjiZ g .! • , .. 7 • fe lb— En O i- 10 .ti r 10 cin < De II— lie .- . .._J _ -�RI u :5 Id < it• 4. 1 - _. r*it - , -1 al sy ... ,„„,,„. 4,1 ar ■ w 'Jf U 0 Li U !lN r -j c..i..� ,./ Sli.41: ii N �OTT°M I a ilk 10( le X11 Li { e- I :.` its Is- T t� s; • j f , y • .. - -fir ••••,..0 CA ..........��_ c�_ t^� I^•' j . litil \ ' OM Me WI, US le Me /, - •� flail ., r--r�.— v. j 10 IN..„ -ssir-Nk`! '` 40 - 1 y� irOk ., I / L-1 l ¶1 1 Z • .. • se 1 IL IL ___-• a _,.. , , 49 1-aill A • /11‘) CO I II� 1 • I . 1} �t I.:, • O o �, be c `1IT) 2 ��, rQ ; I (4......) �t O Q iAZ/ . . >I4 1 ,- •••• ° DI'. 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The options evaluated included several existing and permitted sand and gravel operations in the area which are adjacent to the South Platte River. Based on its proximity to the South Platte River and the timeframe under which gravel mining and reclamation activities will be complete (August 2009), Walker Reservoir was selected to provide operational and augmentation water storage for the Prairie Waters Project. This site was selected in cooperation with the Central Colorado Water Conservancy District. Currently, Hall-Irwin is mining this site under an existing USR permit held by HIBE, LLC (USR No. 1172). The mining and reclamation activities are expected to be completed within a few more years. Since the mining and reclamation activities are not complete at this time, Walker Reservoir is not formally included in this application. However, Walker Reservoir operations are an integral part of future Prairie Waters Project operations. Aurora requests at this time that the Planning Commission grant the city the ability to administratively amend the USR permit by plat once the Walker Reservoir site is released from the obligations of the Division of Minerals and Geology (DMG) permit. b. Types of Agricultural and Other Land Uses Affected (§ 23-2-330.D.2.b) Most of the parcels within the project area are zoned A-Agricultural. Due to the low- intensity nature of the project, the Prairie Waters Project will have minimal effects on agricultural,low-density residential and industrial land uses in the area. ARR Site A - Prior to their acquisition by Aurora, the ARR Site A parcels, consisting of 393 acres, were used for agricultural purposes, including the raising of cattle and the growing of alfalfa, corn, hay, sugar beets and other grains and vegetables. Aurora intends to preserve 99 acres of riparian corridor and existing grass land habitat along the Brighton Ditch and the Lupton Bottom Ditch to the eastern property line. Aurora will supplement the preserved area with the creation of 186 acres of short grass prairie. Northern and Southern Well Fields - All of the parcels are either currently being mined for sand and gravel or are currently used for agricultural purposes. Most of the parcels in the latter category have USR applications pending to mine the parcels for sand and gravel. In their negotiations, Aurora is coordinating with the landowners and mining companies to locate the well fields outside of existing or proposed mine limits. Walker Reservoir - The site is an existing, permitted gravel mine. The approved reclamation plan for this site includes the creation of water storage. As such, Aurora's use of Walker Reservoir for augmentation or operational water storage will not cause the loss of any agricultural lands or affect other surrounding land uses. Please refer to Figure 3 - Land Use Compatibility Map which shows both the existing zoning designations in and around the project area as well as the approved USRs in the area. PRAIRIE WATERS PROJECT Page 3 of 8 £ VIM WV•6£O'9LK7fal y m Lwow/a, • 9.,,,..„ a09 141$ 4 Sr ;01 II3 dvw u.,lei ISVSWG7 a6rcNY1 3,ut 1006sw1 3�Vr)6 It AsNno7 a'IENI larotd Q21alt'dM albvad : WS an XP 0 •..1e.,1 .....• ♦•nom AG 31W1 N016IA321 ON 44•14,N aa0�` MITAViiOHflV warn asaasaa•fof WI Maras='== Otllil rAWI= 131 WW 4 0 wn 03'1140001401 •rt 31015 ••u S =I WZI HJ3w1111!•13.1 1 r I it I c c — — ,j; S 41 r ('Oa3NIl3S • s) '}SH1891 • - ►- i¢Yt , • a. A ilipin lif II) !MA a 1:—...==: \ S...‘1;!--7_ - rattrarrs ! 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S3RIVONfl08 31IS _ _ _ _ _ _ \ / '� _ - •' i , elPrarlu .— I S3NIl .11213d021d — — — — 1 I _....n._„,_________:-=Sin.alaa ' I tiamall S3NIl NO1103S - - - - - 2i3N2iO3 NOIiO3S ® I E ay-'« I —•way raa,. ��I rr a I 2i38Wf1N NOIlO3S 61 a A .Ma__ 1 O anala 33S) S2l3NMO .11213d021d 0 I — _ o star elimillailliMa S3NI12131VM 03SOdO2ld 1 I —alga�•�' 4;laaaMial a5 a AVM 0001d — ` ' ' ' ' I I I NIVld0001d ��V-aMm-4/0 Lamina '+ I . :pram _ :_; I V321V ONINNV1d HIM02I0 I - - ��-""'� -_ wain NO1dfi11210d I : a 1 I - - 0 - - - - 8 -1 1 i :aN3931 4 • I 1 SITE SELECTION WELD COUNTY USR c. Construction Cost of the Proposed Alternatives (§23-2-330.D.2.c) Aurora developed preliminary cost estimates for various pre-treatment alternatives which factored into the city's decision making process to develop the Prairie Waters Project with the alluvial well fields and ARR sites. Because of standardized construction methods that will be used to develop ARR facilities and well fields, comparative construction costs are not applicable to these portions of the project. Differences in costs for the alternative alignments primarily reflect the differing lengths of pipeline for each alternative. d. Impacts on Mineral Resources (§ 23-2-330.D.2.d) The Project will leave the gravel resource in place at the ARR facility as it is a required component of the natural purification process which will be occurring at the site. Aurora has compiled a list of the mineral owners and lessees located within the Prairie Waters Project limits. Aurora is in the process of negotiating Surface Use Agreements with Kerr McGee and KP Kauffman for ARR Site A to ensure that there are no conflicts between existing mineral resource extraction facilities and ARR facility operations. e. Impacts on Wildlife Habitat (§ 23-2-330.D.2.e) Development of the Prairie Waters Project will not cause an adverse impact on wildlife habitat in the area. Once construction of the ARR facility and the Northern and Southern Well Fields is complete, they will serve to enhance wildlife habitat in the area in the following ways. • The cessation of grazing and agricultural production adjacent to the Big Dry Creek, Lupton Bottom Ditch and the South Platte River riparian corridors will allow the understory vegetation to re-establish. This will provide more diverse habitat, which in turn will encourage a greater diversity of wildlife in the area; • The implementation of a phased landscape management plan at the ARR site which will ultimately result in the establishment of a short grass prairie will provide cover and forage for wildlife in the area;and • The landscape plan, that utilizes a native plant palette to screen portions of the operations, will also expand the areas of diversified wildlife habitat to include upland areas between the Big Dry Creek, Lupton Bottom and South Platte River riparian corridors. In addition, although it is part of a later phase, Walker Reservoir will serve to enhance wildlife habitat in the area through: • The creation of shoreline habitat for migratory birds; and • Establishment of native plant species which will provide food, forage, and cover for wildlife in the area. PRAIRIE WATERS PROJECT Page 4 of 8 SITE SELECTION WELD COUNTY USR f. Impacts on Historical, Archaeological and Scenic Resources (§ 23-2-330.D.2.f) ERO prepared a Technical Memorandum entitled Results of the Class I File and Literature Search Cultural and Historic Resources Prairie Waters Project — North Campus (including the well field and conveyance system) to identify any cultural resource sites that are listed in the National Register of Historic Places (NRHP), potentially eligible for listing in the NRHP, or which require additional data prior to a NRHP eligibility determination. According to the results of the Class I File and Literature Search, there are several cultural resources which have been identified in the geographic vicinity that are either currently listed in the NRHP, potentially eligible for listing in the NRHP or which require additional data prior to determining NRHP eligibility. However, none of the cultural resources identified are located within the Prairie Waters Project limits in Weld County. Aurora has made a concerted effort to minimize the impacts to scenic resources by minimizing the number of aboveground structures associated with this project. No new aboveground structures are proposed with this project. The alluvial wells and the recovery wells at the ARR facility will be constructed at or below grade and only a small utility cabinet will be located adjacent to each well. Aurora will use an existing residence and outbuildings for the caretaker's residence and control house. Aurora will enhance the scenic resources in the vicinity of ARR Site A through the preservation of 99 acres of riparian corridor along the Brighton and Lupton Bottom Ditches and existing grasslands, creation of an additional 186 acres of short-grass prairie and utilization of a landscape plan which specifies a native plant palette for additional shrub and tree plantings to screen portions of the project. Figure 4 is an artistic rendering of the developed ARR Site A as viewed from WCR 23 looking north/northeast. The result will be a project that blends in to the surrounding agricultural setting. g. Visual Impacts Created by Aboveground Facilities (§ 23-2-330.D.2.g) The visual impacts created by aboveground facilities proposed with the Prairie Waters Project will be minimal. The only aboveground structures which will be constructed as part of the project are the small , , ,g �. „...41111. .. electrical utility cabinets which will be -'� > ,, , .k T,, “T located near the alluvial wells and • '� • " }' r' r recovery wells at ARR Site A. As '` mentioned previously, Aurora will use -_ - - . _ _ an existing residence and outbuildings for the caretaker's residence and control house at ARR Site A. Please see Photos 1 and 2 above. Photo 3. The existing pump station at Walker Reservoir. At the Walker Reservoir facility, there is art existing pump station to allow water to be diverted from Walker Reservoir to the South Platte River. Aurora will use this pump PRAIRIE WATERS PROJECT Page 5 of 8 a ` r •� ;lit* . nelliaanilliallaill * • �_ Vii' \ `. _ - -_',, -„Itgift >ft% � � II0 ~•! r ` ue; -'. ; f W (n C .:- ..re�. e. } ft / Ityy O N. i -, ` r ILL • N•4. • • tII 4 I �. re V • • tr ,%-• „.. _. . • _____ _ _ • ..?.. r, • • • • r . ' I. = et i. •• t `.' �' 4 i .S. •v :1 • ' ti t 1 ..;.•r• A'. . ter- t ' . `,tom_ . �,• .;,4 ` • •1 • • • II • � - . 1 L ` -- \- t i lig • V w ' - s• . • / •• 'It ' l: ` •=!�44, `• -.. 1r Jas lit t, -I " -- pt,..H. ,•• _ • It_..\-- t. �' I4 a 7pi.r..,%.4.3.:1/43 _ sr le i,y „a:eow-».LcY. / �. • _ _ _ - r. !• `!� ` • ,'• ^ • I • • • • '•:; r le 4' 4 - , `sl Sim Oidi 4. (..........\.I iiii. i _x c.......# #. 10.4 .44, . { ' • 1 ie' � • ,. 'r, • • .. . . ..... ... .......... ... . ...... , - SITE SELECTION WELD COUNTY USR station to meet their augmentation requirements to the South Platte River, as needed. There are no other aboveground facilities proposed for construction at Walker Reservoir. Photo 3 shows the existing pump station at Walker Reservoir after it was constructed. As the shoreline vegetation is established at Walker Reservoir, the visual impact due to the pump station will be lessened. h. Geologic or Flood Hazard Impacts Which Could Adversely Impact the Development (§23-2- 330.D.2.h) None of the Prairie Waters Project components are located in a Geologic Hazard Area as defined by the Geologic Hazard Area Map of Potential Ground Subsidence Areas in Weld County, Colorado prepared by the Weld County Department of Planning Services from data and information supplied by the Colorado Geological Survey in cooperation with Amuedo and Ivey Geological Consulting Engineers on May 10th, 1978. The Northern and Southern well fields and Walker Reservoir are located within the South Platte River's 100-year floodplain as well as portions of ARR Site A. Development of the project will happen in a manner consistent with all applicable Federal, State and County floodplain development regulations. Aurora has prepared an application for a Flood Hazard Development Permit which is included with this USR application. Please refer to this application for specific information regarding how floodplain development standards have been incorporated into the Prairie Waters Project design. i. Procedures employed to mitigate potential impacts of proposed route or site. (§ 23-2- 330.D.4) Construction Phase The Prairie Waters Project is designed to avoid jurisdictional wetlands and sensitive habitat, including that potentially occupied by any threatened and endangered species. To avoid sensitive habitats, alternative construction methods are proposed, such as microtunneling portions of the pipeline as opposed to an "open-cut" construction method. Aurora had wetlands delineated and sensitive habitat identified for the project (please refer to the "Environmental Reports" section of this USR application). This information was incorporated into the designs of the ARR Facility and the Northern and Southern Well Fields to ensure there are no impacts to wetlands or other sensitive habitats. All delineations have been reviewed by the U.S. Army Corps of Engineers, who have agreed with the assessments. Aurora has developed a comprehensive set of environmental construction specifications the selected contractor will be required to adhere to throughout the project. Aurora will have personnel in the field to provide construction management and ensure that all construction activities comply with the applicable Federal, State and County requirements. It is Aurora's belief that these measures will allow construction to proceed in a manner that is protective of sensitive habitats, limits sediment migration off-site and prevents other nuisance conditions from developing (i.e. weeds or dust). Operational Phase Once the Prairie Waters Project is constructed, there will be little impact to surrounding landowners or the environment. The ARR Facility, Northern and Southern Well Fields PRAIRIE WATERS PROJECT Page 6 of 8 SITE SELECTION WELD COUNTY USR and Walker Reservoir will be fenced off to limit access to the site for security reasons. The proposed landscaping at the ARR Facility and Walker Reservoir will buffer any visual impact. There will be limited visual impacts in the Northern and Southern Well Fields, especially as the understory becomes re-established in the South Platte River riparian corridor. In addition, Aurora has developed a Groundwater Monitoring and Mitigation plan to ensure that there are no adverse impacts to adjacent lands due to the construction of the Low Permeable Barrier (LPB) at ARR Site A or the operation of the Northern and Southern Well Fields. j. Advantages and Disadvantages of Sites Considered (§ 23-2-330.D.2.i) A summary of the benefits and constraints associated with ARR Site A, the Northern and Southern Well Field and Walker Reservoir are presented separately below. Table 3. Summary of Benefits and Constraints of the project alternatives Benefits Constraints ARR Site A A low intensity land use that will be compatible A relatively large footprint is required to maximize with surrounding land uses. water quality improvement benefits. The proposed land use is consistent with Ft. Lupton and Brighton's comprehensive plans in this area. Aurora will preserve 99 acres of riparian corridor and existing grassland habitat on-site. The cessation of grazing and agricultural production will allow the understory vegetation to re-establish,thereby creating more diverse habitat which will encourage greater diversity of the wildlife in the area. There are no new aboveground structures proposed with this project which will minimize the visual impact of the project. ARR Site A eliminates the possibility of reverse osmosis systems for treatment,and the environmental impacts associated with this approach,including the potential discharge of concentrated brine. PRAIRIE WATERS PROJECT Page 7 of 8 SITE SELECTION WELD COUNTY USR Benefits Constraints Northern and Southern Well Fields A low intensity land use that will be compatible A significant number of individual property with surrounding land uses. owners must be contacted to arrange for negotiations of purchase for the numerous well sites. The proposed land use is consistent with Ft. Lupton and Brighton's comprehensive plans in this area. There are no new aboveground structures proposed with this project which will minimize the visual impact of the project. Use of alluvial wells to divert Aurora's water rights presents relatively few environmental impacts compared to direct diversions from the South Platte River. Walker Reservoir Walker Reservoir has already been permitted for Since Walker Reservoir will be a part of Aurora's water storage as the final land use. Its inclusion in water supply system,the reservoir will not be the Prairie Waters Project is consistent with available for recreational uses due to water supply previous land use decisions. and public safety concerns. The location of Walker Reservoir,which is in close proximity to the proposed well fields,is ideal for augmentation water which will be delivered to the South Platte River. The timeframe in which reclamation activities will be completed for Walker Reservoir coincides with the 2010 targeted start date for the Prairie Waters Project. Augmentation storage ensures that Aurora's withdrawals do not injure other municipal or agricultural users on the South Platte River. k. Agreements with the Mineral Owners Associated with the Subject Property (§23-2-330.D.2.j) Please refer to the response to§23-2-330.D.2.d given above. I. Agreements with the Ditch Companies Located On or Adjacent to the Site (§23-2-330.D.2.k) Included with this USR application is a preliminary agreement Aurora has developed with the Lupton Bottom Ditch. Aurora is in the process of finalizing this agreement as well as negotiating an agreement with the Brighton Ditch Company. PRAIRIE WATERS PROJECT Page 8 of 8 ALTERNATIVE ANALYSIS WELD COUNTY USR Introduction The following report provides a complete alternative analysis for the pipeline network proposed in Weld County as part of the Prairie Waters Project. This alternatives analysis report is consistent with the requirements outlined in Division 5 Special Review Permits for Major Facilities of a Public Utility or Public Agency,of the Weld County Code. Specifically, this report provides the analysis described in Section 23-2-370.D.2(a-i), 9 and 13 (a and b) of the Weld County Code for the pipeline network. Description of the facilities, including the source, capacity, destination and type of structures (§ 23-2-370.D.1) In accordance with § 23-2-370.D.1, a description of the three alternatives that Aurora reviewed for the pipeline network in Weld County is presented below. Aurora has approached each of the landowners affected by the pipeline alignments in order to secure access agreements to conduct investigative activities as well as demonstrate Aurora's interest in purchasing easements. The lineal footage estimates for each scenario are based on the actual length of the pipeline corridor. For some portions of the pipeline alignment, dual parallel pipelines are proposed to be installed. The dual pipeline system is not designed to provide additional system capacity. There is a raw water supply pipeline and a processed water distribution pipeline. The supply and distribution of the water for this project can not occur simultaneously in one pipeline. The estimated pipeline lengths presented in each table below is for the portion of the pipeline network located in Weld County only. Alternate 1 Alternate 1 was developed after discussions with Weld County Public Works indicated that locating the pipeline alignment in public right-of-way would not be feasible. This alternate parallels existing public right-of-way where possible. Based on favorable negotiations with the landowner south of WCR 4.5, the pipeline alignment heads due south until the alignment nearly reaches 168th Street (Baseline Road). Please refer to Figure 1 which shows Alternates 1 and 2 for the pipeline network in Weld County. The concept for Alternate 1 is generally described as follows: • The northern well field pipeline alignment generally parallels the west side of the South Platte River for approximately one mile north of WCR 8 and one-half mile south of WCR 8. • The pipeline alignment between the northern well field and ARR Site A parallels WCR 8 until reaching the eastern property line for the ARR site. The pipeline alignment is then located inside the ARR site with one crossing of WCR 8 approximately one-half mile east of its intersection with WCR 23. • The pipeline alignment continues to follow the northern and eastern ARR site property lines until reaching WCR 23. • The pipeline alignment generally parallels WCR 23 until its intersection with WCR 4.5. PRAIRIE WATERS PROJECT Page 1 of 11 ALTERNATIVE ANALYSIS WELD COUNTY USR • The pipeline continues south through the Sakata farms property following the same heading as the section line in this area until the pipeline starts to bear southeast approximately one-quarter mile north of 168th Street(Baseline Road). • The pipeline to Walker Reservoir parallels an existing CCWCD easement and waterline located along the half section line for Section 36, Range 67 West, Township 1 North between the Brighton Ditch and Walker Reservoir. • The pipeline alignment to the southern well field wraps around the northern portion of Walker Reservoir. • A portion of the southern well field pipeline alignment is located along the eastern side of Walker Reservoir. The other portion of the southern well field pipeline alignment heads north from the northern end of Walker Reservoir for approximately one-quarter mile before heading east towards the South Platte River. The pipeline alignment then generally parallels the South Platte River for approximately three-quarters of mile north. Alternate 2 The design intent of Alternate 2 is to locate the pipeline corridors within public right-of-way to the maximum extent possible. This alignment is intended to minimize the impacts to surrounding residents from easement acquisition and pipeline construction. Please refer to Figure 1 which shows Alternates 1 and 2 for the pipeline network in Weld County. The concept for Alternate 2 is generally described as follows: • The northern well field pipeline alignment generally parallels the west side of the South Platte River for approximately one mile north of WCR 8 and one-half mile south of WCR 8. • The pipeline alignment between the northern well field and ARR Site A is located in WCR 8. • Through ARR Site A the pipeline is located in WCR 8 until its intersection with WCR 23 at which point the pipeline turns south and is located in WCR 23 until its intersection with WCR 4.5. • The pipeline is located in WCR 4.5 until the road heads south turning into WCR 23.25. • The pipeline remains in the road as it continues south, eventually turning into WCR 23.5, until it intersects 168th Street (Baseline Road). • The pipeline heads east in 168th Street (Baseline Road) for a short distance until the intersection with Tucson Street. • The pipeline to Walker Reservoir parallels an existing Central Colorado Water Conservancy District (CCWCD) easement and waterline located along the half section line for Section 36, Range 67 West, Township 1 North between the Brighton Ditch and Walker Reservoir. PRAIRIE WATERS PROJECT Page 2 of 11 LEGEND . ''II ,J^'r/ - - ii --- -- 'I ,• --.------------___N---____----- -- RIVERS AND CANALS 11 tt(O`• ' d, il FLOODPLAIN i, .e ip1 -- -- LOW PERMEABILITY BARRIER - ) ARR PROPERTY LINE - II•, ; '`-' - - EX. CONTOURS Jy 7 toms-i._.- \/ c'cipy- . ‘ D j 14 ��r=t;s• Co ERNATE-I 18 %,..---) Z- i ti,, • _ _ 13 ' Q o • ^-- cIn .,, ALIGNMENTS a • r.,f9 °ARR SITE A ,,,00 o, t o p . ! / n — ALTERNATE•t ' 0 0 `� '' ALTERNATE-2 1 • 1j 2 , C4 O 9 \CI 1, \_ An4c, i ly�C° ,F2 88JC -+ / IRRIGATED AGRICULTURAL LAND F ill II I \ toAD • i I_ *. e -->, . s Ib ��'(is SU�NT .� oa••r •1.8�I• � s ? CH N � �' am. �`�ii f !'119 '- aiiiii• r. • 0 1r, FL I • 1 �!, ,. . _ . Q -_. FLOOD HAZARD INFORMATION: 7jfr } I J! tt f A` PORTIONS OF THIS PROPERTY ARE LOCATED WITHIN THE 100YR. • so, \ FLOODPLAIN. i P`F •\' _ r'''.ct FLOODPLAIN INFORMATION IS FROM FIRM FLOOD INSURANCE RATE ALTERNATE-D. ALTERNATE•1 _ N.��!%? �� MAP. PANEL NO. 080266 0981 C, DATED SEPT. 28, 1982, AND PANEL NO. ALIGNME tr ALIGNMENT _ • ,�, ,`' - - I '-., • . .op WCR6 " 080266 0983 C, DATED SEPT. 28, 1982. k -• „(iI • 'r- �'I-`�, •`i,'' 1 1 t !T FLOODWAY INFORMATION IS FROM FLOODWAY FLOOD BOUNDARY r.1 j° =`--I r, = v AND FLOODWAY MAP WELD COUNTY, COLORADO (UNINCORPORATED ;r� ,I..,5r'I : o , I AREAS)PANEL 12 OF 14 COMMUNITY PANEL NUMBER 080266 0012, I .. fl r :=' _ i • L rr + • �•; / s DATED SEPTEMBER 28, 1990. ._01/ \ ' Y - - ' " SABaAP AND TOPOGRAPHIC *'' I ALTEr:I�!¢TE•1 ALTERNAyf! , --- KUGN NT _/ TION: ALTERNATE-2 rti: . /' 1'j c I ALIGNMENT u- ''`• /�• I - s I; THE BASEMAP INFORMATION WAS COMPILED WITH SURVEY _ �� • , - - - ^I INFORMATION PREPARED BY: • e % ALTERNA ' -2 • - f ` ' FARNSWORTH GROUP t-y�.!(1.-1GNM • �4.�' + . i to -1 8055E TUFTS AVENUE SUITE 850 ALTERNATE r•t•• / -'----'-j td.I DENVER. CO 80237 ALIGNMENT ty = 1 • ;'II�•I (303)692-8838 1 — II �I' Ir`1 TOPO WAS GENERATED FROM FARNSWORTH AERIAL PHOTO. I I J�q - tv is, ' y, _ ' , I I ICI "al ili �� A, i 1( 1r1 P'' # NIA ILL` I A I I E.. II Ir �r • ' ' ;,- UTILRY INFORMATION. 1 4j UTILITY INFORMATION WAS PROVIDED BY BUCKEYE, DUKE ENERGY. lilt: i ,j O ` ,I I't' KERR MCGEE. XCEL, ENCANA• KP KAUFFMAN, QWEST, AND TODD ._ ni `si i CREEK. II/ ALTE^.NATE-1 ~' _ `, OIL AND GAS LINE LOCATIONS HAVE NOT BEEN FIELD VERIFIED. + NMENT ,y MS ALTERNATE-I U ,ALIGNMENT ` l.,...�-- tfI .•i• I ' •, ^, EXISTING ' 7, lSLURRY WALL S'tl; •� 31ALL COMPONENTS OF THIS PROJECT ARE LOCATED OUTSIDE FORT r "�'� , ° 4.' LUPTON'S ADOPTED URBAN GROWTH BOUNDARY. 4r •� it - C.r t •.,+t.-1.E•2 >✓ / .. • + ` , T i r2 a,- -% --/';',41 � i • cr CL WALKER CITY OF BRIGHTON COMPREHENSIVE PLAN RESERVOIR : ' 7 •?'.. LAND USE DESIGNATIONS: ,"• 2 (/' � / I .. , cwt . 4 BRIGHTON URBAN GROWTH BOUNDARY•168TH ST. (BASELINE RD.) U�I/ ' III RURAL RESIDENTIAL T1S 1 III17'. 1 r ao. { •. AGRICULTURAL•"'�? C4 _` iP Qj T —� �� l_ i I ' lS � 4 � :mss• • it -4--- . :; • .'• -• •1 :1 NOTE 9t ,Is r - tip. last • II� 1 BRIGHTON COMPREHENSIVE PLAN DESIGNATIONS EAST OF THE *� dr' Lisi,-.- ! , ` . _ _'r., - / J+r�� ( �11 SOUTH PLATTE RIVER ARE NOT SHOWN AS THIS IS OUTSIDE THE '° J. r/.J ! • PROJECT AREA. w I h. + a I�•.'t'1�� d51� +Ia• r ',� b I.I '0 PUMP STATION I I. ( '�, ( :,�,. ., r.- II 2. BRIGHTON URBAN GROWTH BOUNDARY IS PER THE WELD COUNTY Q I i ° w' J X11 I URBAN GROWTH BOUNDARY& INTER GOVERNMENTAL MAP Z ___.L. '" '<IIC'X�.t PRODUCED BY WELD COUNTY PLANNING SERVICES, JULY 2005 ARR SITE Ell TUCSON $ ,;!J/t` THE PRAIRIE WATERS PROJECT IS ENTIRELY OUTSIDE FT. L , 1 . I _ ".SOUTH } A ! ;II�� 3. LUPTON'S URBAN GROWTH BOUNDARY. H I -- - - - - HIGHWAY ; - _ 1 - 1 - � w•_ -_ •_ ® , / ~( ' . I I =, IRRIGATED AGRICULTURAL LAND IDENTIFIED THROUGH REVIEW OF 1$= a' : t„t ''j 3:“1/2! 'I f 4 DIGITAL GLOBE SATELLITE IMAGERY COLLECTED ON OCTOBER 25, ----et, I. 7� ° :I �-.ti I ,N„• 2004.iiziC.- \4 i _______/ Ir -I /, u z I a D 8 1 ri t K .� TETRA TECH RMC ® 41141W5,51000 S. sumo St.. SUM 1-r, LONGMONT, CO +OS01 !` 44 in 303.772.5282 MfTRO mittSt7ID TAX 303.606.6950 Q� AURORA WATER yGROQC g North NO R=vISION DATE BY 0 500 2000 -- ---- --- PROACL: g gi liatillimmiti PRAIRIE HATERS °ROJECT WELD COUNT'! i .nE 7 SCALE: I"=1000' ALTERNATE PIPELINE ALIGNMENT v I DonM i0 i RWH 3/06 I•'=2000' o - 4°'1tt nt i I9.0476.039.AM " I j OF 2 s ALTERNATIVE ANALYSIS WELD COUNTY USR • The pipeline alignment to the southern well field wraps around the northern portion of Walker Reservoir. • A portion of the southern well field pipeline alignment is located along the eastern side of Walker Reservoir. The other portion of the southern well field pipeline alignment heads north from the northern end of Walker Reservoir for approximately one-quarter mile before heading east towards the South Platte River. The pipeline alignment then generally parallels the South Platte River for approximately three-quarters of mile north. Preferred Alternative The preferred alternative represents further refinement of Alternate 1. Based on continued negotiations with the same landowner south of WCR 4.5, their preference was to shift the alignment so that it generally parallels the west side of the Brighton Ditch. This minimizes the impacts to this agriculturally producing land while locating the pipeline in an existing utility corridor. Please refer to Figure 2 which shows the preferred pipeline alignment along with future land use designations and irrigated agricultural land uses in the area. The concept for the Preferred Alternative is generally described as follows: • The northern well field pipeline alignment generally parallels the west side of the South Platte River for approximately one mile north of WCR 8 and one-half mile south of WCR 8. • The pipeline alignment between the northern well field and ARR Site A parallels WCR 8 until reaching the eastern property line for the ARR site. The pipeline alignment is located inside the ARR site with one crossing of WCR 8 approximately one-half mile east of its intersection with WCR 23. • The pipeline alignment continues to follow the northern and eastern ARR site property lines until reaching WCR 23. • The pipeline alignment generally parallels WCR 23 until its intersection with WCR 4.5. • The pipeline generally parallels the western side of the Brighton Ditch through the Sakata farms property. • The pipeline to Walker Reservoir parallels an existing CCWCD easement and waterline located along the half section line for Section 36, Range 67 West, Township 1 North between the Brighton Ditch and Walker Reservoir. • The pipeline alignment to the southern well field wraps around the northern portion of Walker Reservoir. • A portion of the southern well field pipeline alignment is located along the eastern side of Walker Reservoir. The other portion of the southern well field pipeline alignment heads north from the northern end of Walker Reservoir for approximately one-quarter mile before heading east towards the South Platte River. The pipeline alignment then generally parallels the South Platte River for approximately three-quarters of mile north. PRAIRIE WATERS PROJECT Page 3 of 11 LEGEND . . �.:�- a K,g_.i(CU_P�♦- - - -'•a'•,-.'. _.I._.-_..... ..r"_t' L r --�- RNERS AND CANALS I n ,-- { �( -- ,_,�,.� 1 �IJ FLOODPLAIN II `_;;;X c'>•b 1`, � •�~ � i'I r r . i r FLOOD WAY i• ✓� - q „ = + - LOW PERMEABILITY BARRIER • ( 2 I �� ARR PROPERTY LINE �� l'1 PRE - ALIGN NT ! j ' • SECTION LINE MARKERS s FLED 1 uy r. I • }II — — — 4958 — — — EX.CONTOURS OODPL �? 'a' r f . r } — - - 'III ALIGNMENTS • I �' Qo. li PREFERRED ALIGNMENT "�" ARR SITE A0\ PROPOSED ,, 9 � r �•21. i:'RRY 11 c 0 . , r '.VALE nA g°.1 /A/ c rJl1a/ • C Il. �, 8, •Q o a , ,/ r/ d PIPE SIZE CIN•) `\ C--4-- -..-_,/ __.}111 i _I o i/�0 PIPE MATERIAL (�. Ai 4 PVC LESS THAN/EOUAL TO 24 INCH DIAMETER 1�' • 9dK ,�V11CR8 ,. STEEL GREATER THAN 24 INCH DIAMETER ir;z , yl ` 5/ Z r(s. l. t, „. O I\ PREEERRE /a _ u ", 6 c lirALIGNMET '°• Sot Th. ,, = c gR1GMON �` °• • �ti '.. * s1 1 q 6 1 YI�il40 IRRIGATED AGRICULTURAL LAND Vireo . lir• 24 r a, t REFERREDI - • •'• °'.` ALIGNMENT t" I 1 t•cie., • k , 'tt ' ,` f 's I FLOOD HAZARD INFORMATION: y— +s=} ! I; aid • ` ° PORTIONS OF THIS PROPERTY ARE LOCATED WITHIN THE 100YR. • is FLOODPLAIN. 1 • e .. PCAT I, FLOODPLAIN INFORMATION IS FROM FIRM FLOOD INSURANCE RATE -'�� _-" �i MAP, PANEL NO. 080266 0981 C, DATED SEPT. 28. 1982. AND PANEL NO. tr • ) . - . '.!' cA WCR a i"' I 080266 0983 C, DATED SEPT. 28, 1982. p i . ,�I a ' ° • _c �y.t ` I� FLOODWAY INFORMATION IS FROM FLOODWAY FLOOD BOUNDARY — — a ' •tit. ' i y y `' Ifr I AND FLOODWAY MAP WELD COUNTY, COLORADO (UNINCORPORATED �`� r 1�s),I , 11 .(I1 AREAS)PANEL 12 OF 14 COMMUNITY PANEL NUMBER 080268 0012, ^�- ' --1w DATED SEPTEMBER 28, 1990. to o i iii ( --- r t:j .f.,;././.4 l l I ' 3 ; ' ' "�f • t �' TOPOGRAPHIC • •! 8 'sosimE . ! 1 r tic. THE BASEMAP INFORMATION WAS COMPILED WITH SURVEY J -f •' -- "J,��' i I r INFORMATION PREPARED BY: - • ° \? ' • 1 .v ll I . ,/" FARNSWORTH GROUP I • • 8 t � �'+'�= 8055 E TUFTS AVENUE SUITE 850 '!jr� t :r yi DENVER, CO 80237 - I ` ' 04, ' (303) 692-8838 C1 t' f L ' I _ -� Z 2' ,. I I 1 j! TOPO WAS GENERATED FROM FARNSWORTH AERIAL PHOTO. PREFERRED .} I F___" I ,••�� 1 , ALIGNMENT �' • ✓ 1 l ✓ e i 17 :1 , �. i ? , : - . r §� 1 / l ' 7, I I a... r r F ' , y' \' �I 'i It i UTILITY INFORNIATION: UTILITY INFORMATION WAS PROVIDED BY BUCKEYE, DUKE ENERGY, �' c 1 KERB MCGEE, XCEL, ENCANA, KP KAUFFMAN, QWEST. AND TODD II t 1 ti' ;P'I' 4g- ''. rc 4 CREEK. I 4 �I '� - + PREFERRE 1 I r I OIL AND GAS LINE LOCATIONS HAVE NOT BEEN FIELD VERIFIED. Auc,NMENT ` / \ ' ,' ;c . / .' I PREFERRED i' . EXISTING I ' ' / ,�� ' �:`x� — 4 ALIGNMENT SLURRY WALL I/ ^ �s6) .. 0 3J.. ALL COMPONENTS OF THIS PROJECT ARE LOCATED OUTSIDE FORT ro / . I . /lii r LUPTON'S ADOPTED URBAN GROWTH BOUNDARY. ;: `fir i J t az t, 'a � , • r71� e— 1 i if Y7. a PLAN WALKER I % CRY OF BRIGHTON COMPREHENSIVE I RESERVOIf �} rr! -• LAND USE DESIGNATIONS: c ; tp i ce` •., tl ₹• BRIGHTON URBAN GROWTH BOUNDARY c. o• • f any . , j TIN I(. 1 T 1 S RURAL RESIDENTIAL 1681H Si (BASELINE RD-) �`' I 'i r• II AGRICULTURAL * -- • h, tit.' s q • 2 _ •• Nara -._ . . • • / , I 1 BRIGHTON COMPREHENSIVE PLAN DESIGNATIONS EAST OF THE Y1:66-1-----A‘ �• r • SOUTH PLATTE RIVER ARE NOT SHOWN AS THIS IS OUTSIDE THE I """P' - + /� i PROJECT AREA. m ,I • o J i _ " N . is 2. BRIGHTON URBAN GROWTH BOUNDARY IS PER THE WELD COUNTY "' °` l i-- - . . URBAN GROWTH BOUNDARY 8 INTER GOVERNMENTAL MAP /,- '"' PRODUCED BY WELL) COUNTY VLANNING SERVICES, JULY 2005 if:,64- ARR • T B TUCSON .p � ' �1` THE PRAIRIE WATERS PROJECT IS ENTIRELY OUTSIDE FT. •. ;ADP - 3. LUPTON'S URBAN GROWTH BOUNDARY. - SOUTH / r �•- ; ; IRRIGATED AGRICULTURAL LAND IDENTIFIED THROUGH REVIEW OF { III t C 4. DIGITAL GLOBE SATELLITE IMAGERY COLLECTED ON OCTOBER 25,i '{ ' ;t'. iy prlr• l 2004. • 1 / , . if--4-ip R Z _ •i, C 2 z z gi I k ii TETRATECH RMC ® 4IA 1 303 1 2 5162 WEIRSUITE 03.663 6L?S3 co 303 665 6959 �`® ; AURORA WATER '7 'i'y m North NO REVISION - DATE - BY P. 0 we MO aaa7 PRO O * PRAIRIE WATERS PROJEC- WELD CO. R Hilt ei SCALE: 1"=1OOO' PREFERRED PIPELINE A_'GNMENT s aftdr RAH 3/06 =2a 8 IA°.`cr ru 1 19.0476.039 AI./ 2 OF 8 ALTERNATIVE ANALYSIS WELD COUNTY USR Table 1 provides a summary of the lineal footage and the approximate area required as permanent easement dedication and temporary construction easement acquisition for all three pipeline alignments which Aurora investigated. Table 1. Pipeline Alignment Comparison Lineal Footage Temporary Pipeline Permanent of Easement Construction Alignment Easement(ac) Required Easement(ac) Alternate 1 56,800 63.61 52.22 Alternate 2 56,400 29.83 11.04 Preferred Alternative 50,300 59.55 46.26 Calculation based on 25,000 LF pipeline alignment with a 60' permanent easement and 31,800 LF pipeline alignment with a 40' permanent easement. 2 Calculation based on 56,8001,F pipeline alignment with 40' of temporary construction easement. 3 Calculation based on 32,400 LF pipeline alignment with a 40' permanent easement. The remaining 24,000 LF of pipeline alignment is located within existing 60' Weld County road right-of-way. 4 Calculation based on 32,400 LF pipeline alignment with 40' of temporary construction easement. For the 24,000 LF of 20' temporary construction easement adjacent to existing Weld County road right-of- way. 5 Calculation based on 29,000 LF pipeline alignment with a 60' permanent easement and 21,300 LF pipeline alignment with a 40' permanent easement. 6 Calculation based on 56,800 LF pipeline alignment with 40' of temporary construction easement. Upon project approval, Aurora will purchase permanent easements ranging in size from 40 to 60 feet, depending on whether one or two pipes will be located in that portion of the pipeline alignment. Generally, Aurora will also negotiate terms for a 40-foot temporary construction easement. If necessary to meet owner expectations, Aurora will purchase entire parcels. A complete analysis of the alternative routes or sites considered, to include in each case (§ 23-2-370.D.2): a. Reasons for Consideration (§ 23-2-370.D.2.a) Aurora looked at several factors in considering each of the pipeline alignment alternatives. These factors include: • Avoiding jurisdictional wetlands and sensitive habitat, • Engineering feasibility, • Minimizing the overall pipeline length, • Minimizing the required ditch crossings, and • Acceptance by affected property owners. PRAIRIE WATERS PROJECT Page 4 of 11 ALTERNATIVE ANALYSIS WELD COUNTY USR b. Types of Agricultural and Other Land Uses Affected (§ 23-2-370.D.2.b) Construction and operation of the pipeline network for the Prairie Waters Project will not have an impact on agricultural, low-density residential or industrial land uses in the area. Through the negotiations with affected property owners, Aurora has coordinated the design and location of the pipeline to accommodate existing or proposed land uses on their property. Please refer to Figure 3 - Land Use Compatibility Plan in the Site Selection report which shows the pipeline alignment along with the existing zoning and approved USRs in the area. c. Construction Cost of the Proposed Alternatives (§23-2-370.D.2.c) Construction costs for the three alternative alignments are summarized in Table 4 below. The construction costs are presented as a relative cost with Alternates 1 and 2 being compared to the preferred alternative. The overall construction cost is divided into three categories: pipeline construction, ditch crossings and land acquisition. Each category was given equal weight in determining the total relative cost of Alternates 1 and 2 as compared to the preferred alternative. Table 2. Construction Cost Comparison Pipeline Ditch Crossings Land Acquisition Construction Total Pipeline Permanent Relative% Alignment Number Lineal Relative Relative &Temporary Relative Costs of Footage %Cost2 %Cost2 Easements4 %Cost2 Crossings3 (ac) 63.6 Alternate 1 56,800 113% 5 100% 110% +23% 52.2 29.8 Alternate 2 56,400 112% 6 117% 39% -32% 11.0 59.5 Preferred 50,300 100% 5 100% 100% N/A Alternative 46.2 1The lineal footage of pipeline construction is based on the lineal footage of easement required and does not account for areas where parallel pipelines will be installed. 2The relative % cost is based on a comparison of Alternates 1 and 2 to the Preferred Alternative. 3The number of ditch crossings reported is for the portion of the pipeline alignment located in Weld County. 4For each alternative, permanent easement requirement is shown in the top half of the cell and the temporary construction easement in the bottom half of the cell. 5The total relative % cost places equal weight on the pipeline construction,ditch crossing and land acquisition relative costs for Alternates 1 and 2 as compared to the Preferred Alternative. Based on the construction cost estimate provided in Table 4, Alternate 2 is the least expensive option based on a much smaller land acquisition requirement. This is PRAIRIE WATERS PROJECT Page 5 of 11 ALTERNATIVE ANALYSIS WELD COUNTY USR attributable to the design intent to place the proposed pipeline location within Weld County public road right-of-way where ever possible. However, in preliminary discussions with Weld County Public Works, the option to put the pipeline within existing road right-of-way was ruled out based on existing utilities already located within the right-of-way and greater construction-related impacts to surrounding residents. Therefore, the preferred alternative becomes the least expensive alternative based on the smaller quantity of pipeline construction and land acquisition costs. d. Impacts on Mineral Resources (§ 23-2-370.D.2.d) Aurora anticipates minimal impacts to mineral resources due to the construction of any of the pipeline alignments shown. Aurora has compiled a list of the mineral owners and lessees associated with the properties along the preferred pipeline alignment. Aurora will work with the mineral owners and lessees associated with each subject property to coordinate the pipeline alignment through the property to minimize impacts to mineral owners and lessees operations. e. Impacts on Wildlife Habitat (§ 23-2-370.D.2.e) Evaluation of Potential Effects to Federally Listed Species in the Vicinity of the City of Aurora Prairie Waters Project - March 21, 2006 (a copy is provided under the "Environmental Report" tab) was prepared to address potential effects from the Prairie Waters Project to the following threatened and endangered species: • Bald Eagle, • Black-footed Ferret, • Colorado Butterfly Plant, • Ute Ladies'-tresses Orchid, and • Preble's Meadow Jumping Mouse. The report identified several Prairie Dog colonies located within the project area. In the vicinity of the project there is also an active Bald Eagle nest and Bald Eagle winter roost, however the nearest project components are approximately one-quarter mile away from the roost and one-half mile away from the nest. The report concludes that the project will not likely affect threatened or endangered species. This report was submitted to the U.S. Fish and Wildlife Service and Aurora received a letter dated May 8, 2006 indicating USFWS concurrence with the report's conclusion. In addition, Aurora has prepared a Prairie Dog Management Plan which is included under the "Environmental Report" tab. This plan discusses approved methods for removal of prairie dogs from construction areas. Starting from the most favorable method, the list includes: passive relocation, wild-to-wild relocation and lethal control. Construction of the preferred pipeline alignment will not create an adverse impact on wildlife habitat in the area. Once construction is complete, all of the structures PRAIRIE WATERS PROJECT Page 6 of 11 ALTERNATIVE ANALYSIS WELD COUNTY USR associated with the pipeline alignment will be below grade. The pipeline easements will be re-seeded with a dryland grass seed mix. f. Impacts on Historical, Archaeological and Scenic Resources (§ 23-2-370.D.2.f) A report entitled Results of the Class I File and Literature Search Cultural and Historic Resources Prairie Waters Project — North Campus (including the well field and conveyance system) was prepared to identify any cultural resource sites that are listed in the National Register of Historic Places (NRHP), potentially eligible for listing in the NRHP, or which require additional data prior to a NRHP eligibility determination. According to the results of the Class I File and Literature Search, all of the proposed pipeline routes will cross the Hoyt Street to Terry Street Transmission Line (5WL3154.2) which is a linear historic feature; however the NRHP assessment for this historic feature is considered "Field Not Eligible". In addition, all three pipeline routes considered cross the Brighton Ditch (5WL2650.1) and the Lupton Bottom Ditch (5WL2652.1) which are both linear historic features whose NRHP assessments are considered to be "Officially Not Eligible" and "Officially Need Data", respectively. In the preferred alternative pipeline alignment, the pipeline is located in the vicinity of a farm complex (5WL1413) which was listed as "Field Eligible". However, further field investigation of this cultural and historical resource showed that the farm complex is located on the opposite side of the Brighton Ditch from the pipeline location on the west side of the Brighton Ditch. The preferred alternative is also located within the vicinity of the Boulder Valley historic railroad (5AM31) and a Boulder Valley Railroad grade crossing (5WL751). The Boulder Valley historic railroad is a linear historical feature with a NRHP assessment of "Field Not Eligible". The Boulder Valley Railroad grade crossing is a historical feature with a NRHP assessment of"Field Not Eligible." In the event that cultural resources are identified in the field during construction, a qualified archaeologist will review the resource. If it deemed ineligible for listing in the NRHP, the archaeologist will retain the resource until construction activities are complete in that area, at which time the resource will be returned to the landowner from whose property the resources were extracted. The scenic resources in the area will not be negatively impacted because once construction is complete; all of the structures associated with the pipeline alignment will be below grade. g. Visual Impacts Created by Aboveground Facilities (§23-2-370.D.2.g) No visual impacts will be created by any of the three proposed pipeline routes because there are no aboveground facilities associated with any of the alternatives. h. Geologic or Flood Hazard Impacts Which Could Adversely Impact the Development (§ 23-2- 370.D.2.h) None of the pipeline alternatives are located in a Geologic Hazard Area as defined by the Geologic Hazard Area Map of Potential Ground Subsidence Areas in Weld County, Colorado PRAIRIE WATERS PROJECT Page 7 of 11 ALTERNATIVE ANALYSIS WELD COUNTY USR prepared by the Weld County Department of Planning Services from data and information supplied by the Colorado Geological Survey in cooperation with Amuedo and Ivey Geological Consulting Engineers on May 10th, 1978. Portions of all three pipeline route alternatives are located within the South Platte River's 100-year floodplain. However, there are no above-grade structures associated with the pipeline alignments themselves. i. Advantages and Disadvantages of Alternatives Considered (§23-2-370.D.2.i) Presented in Table 3 below is a summary of the benefits and constraints of each pipeline alignment that Aurora explored. Table 3. Summary of Benefits and Constraints of the Pipeline Alternatives Benefits Constraints Alternate 1 Portions of the pipeline alignment parallel This is the longest alignment which results in a existing utilities in the area (i.e. along CCWCD greater number of landowners impacted by easement to Walker Reservoir) the pipeline alignment. This alignment is more expensive than the preferred alternative. This alignment bisects an active agriculturally producing property and therefore results in greater impact to agricultural lands in the area. The portion of the alignment south of WCR 4.5 is not desirable to the landowner Alternate 2 The alignment is generally located in existing This is longer than the preferred alignment Weld County road right-of-way resulting in which results in a greater number of minimal impacts to surrounding property landowners impacted by the pipeline owner's existing or proposed land uses. alignment. This alignment is less expensive and has less However, in preliminary discussions with potential for environmental impacts than the Weld County Public Works it was decided preferred alternative because the majority of that using public road right-of-way was not the pipeline alignment is located in Weld feasible because of existing utilities already County road right-of-way. located there. This alignment results in an increased number of required ditch crossings which translates into a higher construction cost. PRAIRIE WATERS PROJECT Page 8 of 11 ALTERNATIVE ANALYSIS WELD COUNTY USR Benefits Constraints This pipeline alignment does not fully incorporate opportunities to coordinate pipeline location with existing or proposed utilities in the area. Preferred Pipeline Alternative This pipeline alignment is shorter than This pipeline alignment does not represent the Alternatives 1 and 2 which results in a fewer least expensive alternative. However,it did number of impacted landowners in the area. not appear to be feasible to utilize existing public rights-of-way wherever possible. This pipeline alignment has been coordinated to coincide with existing and proposed utilities in the area. This pipeline alignment south of WCR 4.5 is preferred by the landowner. The potential for environmental impacts is minimized, in part due to the decreased number of required ditch crossings. j. Agreements with the Mineral Owners Associated with the Subject Property (§23-2-370.D.2.j) Aurora has compiled a list of the mineral owners and lessees along the preferred pipeline alternative. A mineral rights affidavit has been prepared for all of the affected properties. Please refer to the real estate binder for each parcel's mineral rights affidavit. Aurora will work with the mineral owners and lessees associated with each subject property to coordinate the pipeline alignment through the property to minimize impacts to mineral owners and lessees operations. k. Agreements with the Ditch Companies Located On or Adjacent to the Site (§23-2-370.D.2.k) Each of the three alternative pipeline routes presented includes multiple crossings of the Brighton Ditch and a single crossing of the Lupton Bottom Ditch. Aurora is in the process of negotiating crossing agreements for the crossings associated with the preferred alternative pipeline alignment (See "Ditch Agreements"). Description of the Preferred Alternative Route or Site Selection and Reasons for Its Selection (§ 23-2-370.D.3) Please refer to the description of the Preferred Alternate pipeline alignment that is provided in response to § 23-2-370.D.1 above. The preferred pipeline alignment was selected based on minimizing the overall length of the pipeline, the number of ditch crossings, impacts to wetlands and other sensitive species and the number of property owners impacted by PRAIRIE WATERS PROJECT Page 9 of 11 ALTERNATIVE ANALYSIS WELD COUNTY USR construction of the pipeline. The Preferred Alternate pipeline alignment also incorporates direction Aurora received from affected property owners regarding the location of the pipeline through their property. Procedures to be employed in mitigating any adverse impacts of the proposed routes or sites (§ 23-2-370.D.4) Construction Phase The Prairie Waters Project is designed to avoid jurisdictional wetlands and sensitive habitat, including that potentially occupied by any threatened and endangered species. In most cases, the project will avoid impacts to threatened and endangered species, jurisdictional wetlands, and other waters of the U.S. through detailed site assessments that are incorporated into the site selection and design processes. To ensure that there are no construction-related impacts to sensitive areas, construction mitigation measures include but are not limited to: • Grading, Erosion and Sediment Control BMPs; • Establishment of exclusion areas to protect sensitive habitats and areas of historical or cultural significance; • Development of traffic control plans; • Avoidance of impacts to jurisdictional waters through the use of trenchless technology and other environmental controls provided in the construction specifications;and • Mitigation of all construction-related impacts throughout the pipeline corridor, through professionally managed post-construction reclamation efforts. Aurora will purchase private easements rather than using public right-of-way based on Weld County Public Work's recommendation to locate the pipeline outside of public right-of-way to minimize impacts to traffic flow and utility conflicts along the pipeline alignment. In the areas where the pipeline alignment will cross public right-of-way or where field conditions dictate construction within the public right-of-way, Aurora will apply for all of the necessary permits and work with the Weld County Public Works Department to develop appropriate Traffic Control Plans. Operational Phase Once the pipelines are constructed and operational, there should be very little impact to surrounding property owners. In the event of a waterline break, Aurora has standard operating procedures that are employed to ensure that minimal damage occurs to surrounding property owners. The Feasibility of Utilizing Any Existing Utility Line Corridors (§ 23-2-370.D.13.a) Aurora has explored the option to utilize existing utility line corridors. Where possible, Aurora will take advantage of these opportunities assuming construction of the pipeline will not create utility conflicts. In the case of a utility conflict, Aurora will either work around the existing utility company or coordinate with the company to relocate their utility line. For example, the pipeline alignment between Walker Reservoir and the main north/south pipeline parallels an PRAIRIE WATERS PROJECT Page 10 of 11 ALTERNATIVE ANALYSIS WELD COUNTY USR existing CCWCD pipeline. In addition, where it is feasible, the preferred pipeline alignment parallels existing Weld County road right-of-way, thereby taking advantage of the natural utility corridor that exists with public rights-of-way. Existing Underground Utilities Underlying the Alternate Routes (§ 23-2-370.D.13.b) Aurora gathered both horizontal and vertical utility location data in the vicinity of each of the proposed pipeline routes. A list of the names and addresses of the utility companies which have existing underground utility lines in the area is provided below. Aurora is currently working with each of the utility companies listed below to ensure that adequate horizontal and vertical separation is provided between the water line construction and the existing utility lines. Table 4. Existing Utility Companies Located Within the Vicinity of the Alternate and Preferred Pipeline Alignments Utility Company Address Central Colorado Water Conservancy District 3209 West 28th (CCWCD) Greeley,CO 80634-7554 1907 Powhaton Road Buckeye Partners Aurora,Colorado 80019 370 17th Street,Suite 2500 Duke Denver,CO 80202 1313 Denver Avenue,Building 1 EnCana Oil&Gas(USA)Inc. Fort Lupton,Colorado 80621 635 North 7°i Avenue Kerr McGee Rocky Mountain Corporation Brighton,Colorado 80601 Kc. 1675 Broadway,Suite 2800 P Kauffman Company,In Denver,Colorado 80202-4628 4000 Fisk Rd Merritt Energy Manistee,MI 49660-9750 8679 Weld County Road 4 Mountain View Water Brighton,CO 80603-8901 12121 Grant Street Qwest Thornton,Colorado 80241 21 North 1s'Avenue Todd Creek Farms Brighton,CO 80601 -1637 18551 East 160"'Avenue United Power Brighton,Colorado 80601 55015"'Street,Suite 700 Xcel Energy Denver,Colorado 80202-4256 PRAIRIE WATERS PROJECT Page 11 of 11 HAZARD & EMERGENCY RESPONSE PROCEDURES WELD COUNTY USR Hazard and Emergency Response Procedures The policy of the City of Aurora is to provide and maintain a safe working environment and to implement practices that will allow for a safe environment for employees, consultants, and contractors, thereby resulting in greater efficiency and less incident or injury. This summary will serve to comply with Weld County Code, Section 23-2-370 n. 7-8, and describe the hazard and emergency response procedures to be employed at the aquifer recharge and recovery (ARR) Site A during the construction and operation phases of the Prairie Waters Project. During the construction phase, a third party construction management firm will be hired to oversee construction activities for all components of the Prairie Waters Project. The selected general contractors who will be responsible for constructing portions of the project will be responsible for their own health and safety on-site. Once the Prairie Waters Project has entered the operational phase, Aurora will be responsible for health and safety at ARR Site A. The Prairie Waters Project is a very low-intensity land use. There will be limited fire, explosion or other public health and safety dangers associated with the construction or operation of ARR Site A. There may fuel storage and some chemical storage related to the equipment servicing operations near the caretaker's residence which could pose a fire danger. However, Aurora will ensure that these operations are fully compliant with the Spill Prevention, Containment and Countermeasure Plan requirements under Oil Pollution Prevention regulation at Title 40 of the Code of Federal Regulations, Part 112, (40 CFR 112) and any other pertinent Federal, State or local requirements. Also, as required by Title 29 of the Code of Federal Regulations (CFR), Part 1910.1200, the Occupational Safety and Health Administration (OSHA) Hazard Communication Standard, on-site personnel will be informed of chemical hazards. Additionally, in the event of a waterline break, Aurora will employ standard operating procedures to minimize risk to public health or safety and to ensure that minimal damage occurs to surrounding property owners. In the event of an emergency, the following emergency contacts will be used. Sheriff's Department Dial 911 -or- County Switchboard: 970-356-4000 Ambulance/Paramedic Weld County Ambulance 970-353-5700 x3200 Fort Lupton Fire Protection District 303-857-4603 PRAIRIE WATERS PROJECT Page 1 of 1 fib) TETRA TECH RMC August 24, 2006 Mr. Donald Carroll Engineering Administrator Weld County P.O. Box 758, I 1 11 H Street Greeley, CO 80632-0758 SUBJECT: North Campus Prairie Waters Project Traffic Study Dear Don, The City of Aurora is proposing a riverbank filtration (RBF) and aquifer recharge and recovery (ARR) system for diversion of existing water rights. Water from the South Platte River will be pumped from wells and naturally filtered in purification basins before being transported 34 miles south to the Aurora Reservoir via pipeline. The Prairie Waters Project is located in both Weld and Adams County between Highway 7 and Weld County Road (WCR) 10,just west of the South Platte River and east of WCR 23. This study evaluates the potential traffic impacts associated with the proposed project in Weld County, Colorado (see Figure 1). Within Weld County, the project is located north of Baseline Road (168th Avenue). Project traffic will impact nearby roads most during construction as water pipelines are being built, with negligible post-construction impacts. This study contains the investigations necessary to understand the level of traffic impact to adjacent County roads associated with the construction and operation of the Prairie Waters Project. Key steps undertaken as part of this study are defined below: • Discuss current traffic and roadway data in the immediate area of the site • Discuss traffic conditions during construction • Determine site generated traffic volumes for future roadway conditions • Identify areas of potential deficiencies and recommend measures to mitigate any impact of site generated traffic as appropriate CURRENT SITE CONDITIONS The fringe of the Brighton urban area is located 2-3 miles to the south of the project site. In the immediate area of the site, land uses are generally devoted to other mining and processing operations, as well as agricultural. U.S. 85 is the major north-south roadway serving this area. It provides regional service and is located about IA mile cast of the site. U.S. 85 has two lanes in each direction with auxiliary lanes at F::0476_039\0476.039.0 I Permitting Weld County. 1900 S.Sunset Street,Suite 1-F Longmont,CO 80501 TM:303.772.5282 Fax:303.665.6959 www.ttrmc.com TETRATECH RMC Donald Carroll IMIPage 2 of 4 August 24, 2006 intersections and a posted speed limit of 65 miles per hour. The Annual Average Daily Traffic from CDOT for U.S. 85 was 27,300 in the vicinity of WCR 6 for the year 2005. AADT counts were also collected from Weld County as part of this study, and are noted below for those County roads where counts were available. Intersections were not evaluated using highway capacity procedures since there will be minimal traffic impacts after construction. The following County roads exist in the project area: • Baseline Road/168th Avenue-2-lane paved road, 3-foot gravel shoulders, 45 mph posted speed, signalized intersection with U.S. 85 • WCR 4.5 2-lane gravel road • WCR 6-2-lane paved road, 45 mph posted speed between WCR 23 and Wattenberg, 35 mph through Town of Wattenberg, no shoulder, AADT=2057 (Year 2005) between WCR 23 and U.S. 85, signalized intersection at U.S. 85, serves a limited role in the east-west roadway system given the availability of Highway 7 two miles to the south • WCR 8-2-lane gravel road, non-signalized intersection with U.S. 85, AADT=66 (Year 2004) • WCR 23 (South of WCR 6) 2-lane gravel road • WCR 23 (North of WCR 6) 2-lane paved road, 1-foot paved shoulders, AADT between 400 and 500 vehicles (per Don Carroll), serves a limited role in the north-south roadway system given the availability of U.S. 85 1.5 miles to the east • WCR 23.25 2-lane gravel road • WCR 23.5 2-lane gravel road • WCR 23.75 2-lane gravel road CONSTRUCTION TRAFFIC CONDITIONS County roads will be impacted by the construction of water pipelines and the low permeability barrier(LPB). The pipeline will normally have a 60-foot permanent easement in addition to a 20- foot temporary construction easement on either side of the permanent easement. Pipe will be dropped off within this 100-foot construction area. The LPB will be constructed on City of Aurora property, so no easement is needed. Trucks will be accessing the site to deliver construction materials and pipe throughout the 1 Yz year construction period. These activities will not adversely affect the traffic operations of roadway facilities within the project site since most of the roads are low-volume facilities. Access to local residents will be maintained at all times. Certain County roads will be impacted during construction due to pipeline and LPB crossings (see Figure 1). Pipelines ranging from 20" to 48" will be constructed adjacent to WCR 8 and WCR 23 with crossings at WCR 8, WCR 6, WCR 23, WCR 23.5 and Baseline Road/168'h Avenue. The LPB will cross WCR 8 at two locations. For WCR 8, there will be pipe crossings at three locations and LPB crossings at two locations. The LPB will cross WCR 8 approximately 1000 feet east of WCR 23. Two pipes of 36" and 48" IllTh TETRATECH RMC Donald Carroll EPage 3 of 4 August 24, 2006 diameter each will cross WCR 8 at approximately 2,500 feet east of WCR 23, and an LPB crossing will occur just west of this location. Two pipes of 36" diameter each will cross WCR 8 at approximately 2,800 feet west of U.S. 85 and at 2,000 feet west of U.S. 85. There will be short- term lane closures for this construction, but WCR 8 will not be fully closed. Along WCR 23, the 60' pipeline easement will accommodate two pipes (36" and 48" diameter) and be located along the east side of the roadway right-of-way. To allow for any proposed widening, the edge of the 60' pipeline easement will be located generally 60' from the existing roadway centerline. There will be two pipe crossings (36" and 48") of WCR 6 just east of the intersection with WCR 23. Since this crossing will be bored, there will be no traffic interruption. There will be an additional crossing of WCR 4.5 approximately 700 feet west of the WCR 4.5/23.25 intersection for the 36' and 48" diameter pipes. Short-term lane closures will be required to accommodate this construction, but WCR 4.5 will not be fully closed. There will be two-36" diameter pipes crossing WCR 23.5 in an east-west direction 1400 feet south of the WCR 23.25/WCR 23.75 intersection with WCR 23.5. Short-term lane closures will be required to accommodate this construction, but WCR 23.5 will not be fully closed. There will be two pipe crossings (36" and 48") of Baseline Road/168th Avenue, approximately 1600 feet west of WCR 23.5. This crossing will be bored, so there will be no interruption of traffic. Weld County does not maintain this segment of Baseline Road, but owns one-half of the roadway facility. Dust can be a concern during construction. The project can mitigate for dust on County roads, when appropriate, by reducing speed limits, using dust control agents such as water, magnesium chloride and calcium chloride, and placing gravel in the ingress and egress areas. Per Weld County policy, if the AADT count exceeds 200 vehicles per day, the roadway may be eligible for fugitive dust control mitigation. The AADT count for WCR 8 was 122 in 2002 and 66 in 2004. Vehicle tracking control will be used to prevent the tracking of mud on paved roadways. All traffic control will conform to the provisions of the Manual on Uniform Traffic Control Devices (MUTCD), Part VI, 2003 Edition. Traffic control plans will be provided to the County Transportation Engineer for approval prior to the start of construction. FUTURE TRAFFIC CONDITIONS After the completion of construction, project generated traffic will be minimal. City of Aurora personnel will be using site roads one to two times each day for operations and maintenance. Well maintenance with heavy machinery would be minimal during the post-construction period. TETRATECH RMC Donald Carroll Page 4 of 4 August 24, 2006 There will be three new access locations. In addition, three access locations will be relocated. The return radii at access points will be increased to allow for turning movements from larger vehicles. The U.S. 85/WCR 6 intersection has been identified in the U.S. 85 Access Control Plan as needing reconstruction to an interchange configuration. This improvement is rated as a long-term priority which may or may not happen by 2024. For purposes of this study, the current roadway geometry is expected to remain constant through the long-term. As a result of the proposed use of the ARR site, "soft spots" are not anticipated to affect WCR 8. The proposed infiltration basins under normal operations will hold approximately 18" of water with the bottom of the infiltration basins approximately 5 to 8 feet deep. The existing groundwater on site ranges between 3 and 16 feet deep. The proposed recovery wells located around the perimeter of the LPB will lower the existing groundwater table on site during pumping. Most likely the groundwater table beneath WCR 8 will be lower than the existing conditions. CONCLUSIONS/RECOMMENDATIONS Based on the above documented analyses and investigations, the following can be concluded: • Current operating conditions are acceptable in the area of the Prairie Waters Project. • The Prairie Waters Project will generate one to two trips per day on project site roads. No auxiliary lanes are warranted. These trips can be easily managed. • Acceptable operating conditions will be achieved and maintained through the construction period at all intersections, due to the minimal construction impacts anticipated to the low traffic volumes. In summary, the Prairie Waters Project will not adversely impact the area roadway system. Sincerely, TETRA TECH RMC, INC. Sten Bolander, P.E. Project Manager Attachment Figure 1 — Pipeline and LPB Crossings of Weld County Roads : / \ \ « » ; a?' /_Th / � y . > ( ,- co ` % - % j \ o o © .. . z , «� - Cl)- e I >\ N G :e � . : ) , . : ... . : E« | �� Lu \\ n* : I ( �) i I : | CC rl F. 2 / , z • "~ ' L! '! /- - | . 2 : - - ! •© . , t11 CC { \ \ > _-- z § . ! 0. al e-! \ \ O § e 3. . . 2 co ) . . § _ ^- - •' w s i ) » _ y \ i. / § Ow CO . . . \ ! ( §. } . » g ! \ w • _ \ ... ; e O O . , it. !. ` WELD COUNTY ROAD ACCESS INFORMATION SHEET Road File#: Date: April 3, 2006 RE# : Other Case#: Weld County Department of Public Works 111 H Street, P.O. Box 758, Greeley, Colorado 80632 Phone: (970)356-4000, Ext. 3750 Fax: (970) 304-6497 1. Applicant Name City of Aurora Phone 303-326-6513 Address 14707 E.2nd Avenue, Suite 150 City Aurora State CO Zip 80011 2. Address or Location of Access West of the WCR 8 and U.S. 85 intersection Section Township Range Subdivision Block Lot Weld County Road#: 8 Side of Road N and S Distance from nearest intersection 3. Is there an existing access(es)to the property? Yes X No #of Accesses 4 4. Proposed Use: ❑ Permanent ❑ Residential/Agricultural ® Industrial ❑ Temporary ❑ Subdivision U Commercial U Other 5. Site Sketch Legend for Access Description: AG = Agricultural RES = Residential O&G = Oil&Gas D.R. = Ditch Road = House = Shed = Proposed Access = Existing Access See Attached Site Sketch Ni ..... OFFICE USE ONLY: Road ADT Date Accidents Date Road ADT Date Accidents Date Drainage Requirement Culvert Size Length Special Conditions ❑ Installation Authorized ❑ Information Insufficient Reviewed By: Title: r d w M = [--•. I LL O O . N O T- 2 :L C O ` 0 • ,_ w 0 < 0 < C N I— a ~ W ~ _- s W q`, U.S- 85 _ co z Ho . _ 0 O �� N Q O 0 LL C2 w 1 - C t a� is I w O _Z = CC F- 1 _ U E (A H u_ I (n cn (n W cnO S4ik° WI Q _ t 0 C as COI- zz z ow w- ` O w 44` 4 O OH Hp . •s y - Zi DITCH ,. a w Z �� j . . � • W w cow �� W -0 0 of U <a. CO Q W aW ` UPTON o Q o r •. . w w w,_ I ` C Q O ? O =a �, a Il I— a_ O0 co I-w CC tF I 2U W W a oC w U I C ¢ Q WO_ z zC cn Q d co-pcc zw I ¢ d� o C] w� V 'V O ad ul� s-4 ' ow W -m (!) oa O W O ¢z �� W U = In m C ¢ �a i 2 d gtt m B1G DRY • CREEK 0 ¢ a i_wU l 1 C 3 r / WCR 23 r -• a ( g J u) 0L • O U w `v . w w Ds co _�•._� Q Cou.i � o Q w o o d ! v- 1 0 - c0ct W'ill / t- . ..-- U w o2S C Lij W Q cY O 5 _ IGA NOTICE OF INQUIRY WELD COUNTY USR The Prairie Waters Project is not located within the Fort Lupton Urban Growth Boundary (UGB). However, Aurora has provided information to and coordinated with the City of Fort Lupton (Ft. Lupton) to develop the components of the Prairie Waters Project in a manner that is consistent with the Fort Lupton Comprehensive Plan. Fort Lupton is currently in the process of updating the comprehensive plan, which will include an expansion of the UGB. With this expansion, portions of the Prairie Waters Project may be contiguous or within the Fort Lupton UGB. Aurora is committed to continuing an on-going dialog with Fort Lupton to ensure that the Prairie Waters Project is also consistent with their future comprehensive planning efforts. Please refer to the attached letter provided by Tom Parko, Planning Director for Fort Lupton. Portions of the Prairie Water Projects are located within the City of Brighton (Brighton) UGB. Aurora has also been in communication with the Brighton regarding the Prairie Waters Project. A letter from Brighton is expected and will be provided upon receipt. In addition, Aurora has initiated discussions with Adams County regarding permitting requirements for the portions of the Prairie Waters Project located within Adams County. Please refer to the attached letter from Abel Montoya, Planning Manager at Adams County dated August 7, 2006 regarding the Prairie Waters Project. PRAIRIE WATERS PROJECT Page 1 of 1 IGA NOTICE OF INQUIRY WELD COUNTY USR Public Outreach Aurora is committed to working with northern Colorado communities to ensure that the Prairie Waters Project is located, constructed and operated in an acceptable manner. Additionally, the City is committed to approaching businesses, residents and land owners with the respect that they deserve. The Prairie Waters Program is developing a proactive public information program that will employ a number of methods to ensure that public information needs are met throughout the program. These methods include: • Conduct one-on-one meetings with project neighbors. • Coordinate presentations to give to community organizations and civic groups. • Hold open house and/or other organized events. • Publish specialized literature for project neighbors, such as fact sheets, newsletters or project update mailers. Prairie Waters Project representatives have been working with land owners and impacted parties along the project alignment to answer questions and explain project components. Throughout the public involvement process the Project Team will work to make sure that each question and issue raised by individuals is answered in the most efficient manner possible. PRAIRIE WATERS PROJECT Page 1 of 1 Robert D. Coney ;, ;_ Planning and DIRECTOR ,,!• Development Department 12200 Pecos Street ADAMSCOUNTY Westminster, CO 80234 till v V 1� 1 1 PHONE 303.453.8800 COLORADO FAX 303.453.8829 www.co.adams.co.us August 7, 2006 City of Aurora Water Department • Administration Attn: Peter Binney 15151 East Alameda Parkway, Suite 3600 Aurora, Co. 80012 RE: Proposed Intergovernmental Agreement / Major Extension of Domestic Water Treatment System I Riverdale Road and HWY 7 / PD # 837706 / PRE2006-00065 Dear Mr. Binney, The Adams County Department of Planning and Development has reviewed the preliminary submission package for the Aurora Water Prairie Waters Project dated July 12, 2006, concerning the proposed intergovernmental agreement (IGA) pertaining to Aurora's Major Extension of Domestic Water Treatment System located near Riverdale Road and HWY 7. On July 25, 2006 we meet and discussed a number of issues, which included, 1 . the initial IGA process, 2. additional information, and 3. additional concepts which need to be addressed in the context of the IGA. 1 . The initial IGA Process: Once you have completed the preliminary submission package for the Aurora Water Prairie Waters Project the County will internally review the completed package to verify all requirements have been satisfied. Once satisfied, the County will request a draft IGA, which we will review. If there are any outstanding issues we will request the City submit the additional information as soon as possible. The anticipated response time from the County after a complete draft IGA is received will be approximately 30 days. Once all outstanding issues have been resolved we will forward the draft IGA and a copy of the Aurora Water Prairie Waters Project final draft to pertinent referral agencies in accordance with Section 6-07-02-12. Referral packets will also be mailed to pmperty owners within a minimum of 500 feet from the boundaries of the preferred and alternative routes. At the end of the 30 day referral period the Department of Planning and Development will evaluate the referral comments. It will be the responsibility of the BOARD OF COUNTY COMMISSIONERS W. R. "Skip" Fischer Alice J. Nichol Larry W. Pace DISTRICT 1 DISTRICT 2 DISTRICT 3 City of Aurora to comment and respond to all referral and citizen inquires and concerns. Once completed to the satisfaction of the County, the Planning Commission hearing and Board of County Commission hearing dates will be established in accordance with Section 6-11 . 2, 3. Additional information / additional concepts which need to be addressed in the context of the 'GA: After careful review the Department of Planning and Development has identified a number of areas where more information is required to be submitted in order to deem the application complete and ready to be reviewed. Those areas include: A. Submittal of a detailed plan, which identifies the preferred and alternative routes, impacted parcel numbers and property owner information, impacted easements, location and names of roads impacted a detailed map of land uses and zoning, differentiation of jurisdictions, and the location of County owned property impacted by the transmission line and/or ancillary apparatus. B. Clarification as to the land entitlement time frame, land acquisition status and time frame, and construction phasing and time frames. C. Approval from the E-470 Authority concerning the location of the transmission line within the Multiple-Use-Easement (MUE). D. Clarification concerning the location of the transmission line within portions of the City of Brighton, and adjacent to future development. E. Clarification of the proposed City of Brighton trail system west of Riverdale Road. F. Clarification of the proposed location of the transmission line in relation to the proposed interchanges at I-76 and Potomac Street. G. Explanation of the resolution of the transmission line alignment with South Adams County Water and Sanitation District, Commerce City, E- 470, and developers in the area including Adams Crossing developers. H. Explanation of the portions of the proposed alignments, which were investigated and the reasoning behind the determination of infeasibility due to environmental and engineering constraints. • 1. Submittal of the detailed analysis of water supply, demand and storage capacity data considered by the Aurora City Council. J. Submittal of Comprehensive storm water management plans and, grading, erosion, and sediment control plans. K. A Detailed list of Property Rights, Permits and Other Approvals as defined in the draft Prairie Waters Project report, Section 5.0, dated July 12, 2006. L. Clarification concerning the East Cherry Creek Valley Water and Sanitation Disttict (ECCV) and the Todd Creek Metropolitan District relationships or roles with the City of Aurora.. M. Submittal of a site plan and detailed elevation drawings concerning the proposed maintenance building. N. Description and location of temporary nuisances and historical and cultural resources including unique agricultural lands. O. Submittal of a Socioeconomic Assessment. P. Clarification and confirmation of the need and location of potential new recreational opportunities which shall be reviewed with the Adams County Parks Department as soon as possible. Q. Description and location of all above ground structures along with screening and landscaping proposals. R Clarification and description of the City of Aurora's comprehensive Voluntary Clean Up Plan (VCUP) for the proposed ARP site located north of Hwy 7. S. A detailed summary of the residents attending the three neighborhood meetings and a summary of their issues and your proposed resolution of any perceived conflicts. T. Submittal of opportunities and proposals to meet mutually beneficial objectives with municipal and special districts in the area. • 4 U. Description of how the proposed project will affect urban/rural development patterns, densities, and propagate development. V. Description, association, and/or obstacles concerning other municipal and district water projects in the area. In addition, I have included a copy of the mailing labels and map of the residents you are required to notify for the neighborhood meeting. As you are aware, the County encourages the IGA process to promote mutually beneficial relationships and effectively address areas and activities of state and regional interest, however, the County may elect to enter into an IGA, at its sole discretion. We are aware the City of Aurora has submitted engineering documents to the Adams County Department of Public Works, Engineering Section, for review. Those plans are currently under review and I am unfortunately unable to comment concerning relevant engineering concerns at this time. Once you have submitted the above information, the County will be better able to inform you of outstanding preliminary issues and concerns. The second component will include an official referral to, but is not limited to, County, State and Federal agencies. The referral period will take thirty (30) days to complete. At that time, the Department of Public Works, Engineering Section's comments, referral agency comments, and community concerns will be evaluated. The third step will be to draft the IGA, after which, a study session with the Board of County Commissioners would be most beneficial. If the County is satisfied with the draft IGA, the Department of Planning and Development will schedule two public hearings before the Planning Commission and Board of County Commissioners. The time required to complete the entire process is largely dependant on how quickly the City can submit the information listed above and how quickly the City can respond to community and referral agency comments. Additional issues or concerns may arise during potential land use submittals that are not included within the letter. After the neighborhood/scoping meeting and referral period have satisfactorily concluded, the hearing process may take approximately eight (8) weeks to complete. The following County contacts would be very helpful if you were to contact them concern specific questions within their respectful fields. Mark Omoto, Engineering 303-453-8782 Dale Arpin, Traffic 303-853-7129 Crystal Gray, Director of Parks and Community Resources 303-637-8005 Please do not hesitate to contact me in our offices to discuss this matter further. Sincerely, Abel. M. Montoya Planning Manager (303)453-8815 AMontoya@Co.Adams.Co.us CC: J. David Holm, Environmental Permitting Manager 15151 E. Alameda Parkway, Suite 3600 Aurora, CO. 80012 Mark Miller, Deputy Director for Water Resources 15151 E. Alameda Parkway, Suite 3600 Aurora, CO. 80012 Tetra Tech Attn: Julie Vlier, Manager, Water Resources 1900 S. Sunset Street, Suite I-F Longmont, CO. 80501 Rob Coney, Director of Planning and Development Jim Robinson Hal Warren Crystal Gray, Director of Parks and Community Resources Besharah Najjar, Engineering Manager Mark Omoto, Adams County Department of Public Works Larry Haynie, Chief Building Official Robert Fleming, ADCO Consulting C FORT !Ur City of Fort Lupton 18 t . Plannin and Building .,toaflO Department Performance, Integrity, Teamwork, Accountability and Service (303) 857-6694 x 125 Tom Parko, Planning Director Fax (303) 857-0351 130 S. McKinley Avenue e-mail: planner@frii.net Fort Lupton, Colorado 80621 http://www.fortlupton.org August 14, 2006 Weld County Planning Department Attention: Jacqueline Hatch 918 10th Street Greeley, Colorado 80631 RE: City of Aurora's Prairie Waters Project. Dear Ms. Hatch: The City of Fort Lupton hereby acknowledges that the City of Aurora will be applying for a Use by Special Review Permit in Weld County regarding Prairie Waters. The City of Aurora and their consultant, Tetra Tech RMC, have been in contact with City staff on various occasions and made a presentation before the Fort Lupton Council highlighting the key components of Prairie Waters. Fort Lupton has reviewed its comprehensive plans and cannot find any conflicts in land uses or transportation. However, the City has filed an objection with the State Water Court concerning the impacts from the proposed alluvial well systems on the west bank of the South Platte River and the status is pending. Regards, Tom Parko Planning Director City of Fort Lupton Cc: Jim Sidebottom, Fort Lupton Administrator Shannon Crespin, Mayor - 1 - OIL AND GAS SURFACE USE AGREEMENTS WELD COUNTY USR Aurora is in the process of negotiating the necessary Surface Use Agreements. These agreements will be provided to the County upon receipt. PRAIRIE WATERS PROJECT PAGE 1 TECHNICAL MEMORANDUM Tetra Tech Infiltration Test Plan North Campus Prairie Waters Project PREPARED FOR: Aurora Water Capital Projects Division PREPARED BY: Tetra Tech RIM DATE: August 25, 2006 Purpose The purpose of this memorandum is to outline the test plan for the Prairie Waters Project, North Campus, Aquifer Recharge and Recovery (ARR) infiltration testing. The testing will occur between July 2006 and May 2007 at the infiltration test basin facilities located approximately one- half mile east of County Road 23 and one-quarter mile north of County Road 8 in Weld County. The testing is being conducted in accordance with a temporary Substitute Water Supply Plan approved by the State Engineer's Office. Specifically, the test will accomplish the following: • Improve the design team's ability to model and predict the full-scale capacity of the ARR sites. • Improve the design team's ability to model and predict the locations pumping capacities and of ARR extraction wells. • Provide direct measurement of the infiltration rate in the area of a mud lens. The basin location was chosen to include a mud lens. • Provide for an evaluation of infiltration drying maintenance cycles. We do not currently understand how the rate of algae growth will impact the infiltration capacity with time. The testing provides for infiltration drying and maintenance to evaluate this element of the ARR operation. • Provide an array of monitoring wells to allow for an evaluation of the flow paths through or around the mud lens. • Provide a source of riverbank filtration(RBF)water for the ARR infiltration basin. The RBF well was chosen because it will provide a source of water that is similar to the water quality that will be provided by the North well field for the first 8 to 15 years of operation. The infiltration testing will be conducted for assessment of the vertical infiltration rates at the ARR A test site. The infiltration tests will initially be conducted with native material in the infiltration basin bottom and may be followed with tests of various basin bottom amendments. F:44740_007_03\Correspondence\Infiltration Test Water Monitoring Memo Weld USR 8-24-06 draft.doc INFILTRATION TEST PLAN-NORTH CAMPUS PRAIRIE WATERS PROJECT Infiltration Testing The ARR A infiltration test basin is designed to facilitate assessment of the vertical infiltration rate of groundwater through alluvial aquifer materials. The infiltration test basin is also designed to allow analysis of infiltration utilizing the network of monitoring wells, pumping wells, and the riverbank filtration well. Figure 1 shows a detail of the infiltration basin. Though specific testing procedures will largely be dictated by site conditions and the actual properties of the materials being tested, the following is a general description of the procedure for infiltration testing. 1. The existing riverbank filtration well (the McWilliams Well) has been tested. The well was pumped and the water was diverted around the infiltration test basin and discharged directly to Big Dry Creek. 2. Ongoing periodic static water level monitoring was performed at regular intervals in order to evaluate groundwater level conditions while not under the influence of pumping or basin filling. 3. Two of the four pumping wells have been pump tested to estimate horizontal hydraulic conductivity beneath the basin. Each well was pumped at a constant rate of approximately 300 GPM for 24 hours. Water levels were recorded using a data logger in the pumping well and the two closest monitoring wells. Water levels were manually measured in the monitoring wells in the vicinity of the test well, and the closest monitoring wells in the basin bottom throughout the test period. 4. Following the pump testing described in step 3, the system was allowed to recover for six days in order to establish equilibrium conditions prior to the start of infiltration testing. 5. The infiltration testing will be occurring in the following phases: a. Infiltration has been tested without any test well pumping. Water was introduced into the basin at a rate of approximately 200 GPM in an attempt to keep the basin water level depth at one foot. Basin water levels were monitored and recorded on two staff gauges installed in the basin bottom. Flows were monitored and recorded by regular readings of the inlet flowmeter. Water levels in the monitoring wells were measured and recorded regularly using a combination of three pressure transducers and manual measurements. Manual water level measurements in all wells were measured at least once per day. b. Infiltration was tested with each test well pumping at 100 gpm with the intent of lowering the level of groundwater below the basin bottom. c. The basin is now being cycled wet-dry to evaluate cycle times for drying and maintenance needs. The basin will then be re-filled until steady state conditions are reached in the monitoring wells. F:14740_007_031Correspondencellnf ltration Test Water Monitoring Memo Weld USR 8-24-06 draft:doc INFILTRATION TEST PLAN-NORTH CAMPUS PRAIRIE WATERS PROJECT d. During the recharge periods (described in c) the pumping rates of the wells may be adjusted to observe any effects on the infiltration rate. The water levels in nested monitoring wells in the basin will be measured frequently to monitor head and saturation below the basin. e. If the infiltration rate is observed to be adversely impacted by algal growth, the algae will be disked or removed and another infiltration test will be run to evaluate the effectiveness of the algae treatment. f. After the initial infiltration testing program is complete, infiltration with basin bottom amendments will be tested. The amendment testing will begin by dividing the basin into three segments to test different percentages of basin bottom amendments. The infiltration testing(as described in c) will be repeated with the amendments. g. Infiltration testing with drilled vertical rock drains or columns may be conducted if low infiltration rates are found in the previously described tests. If the testing is conducted, the procedure described in c would be repeated with the rock columns. Water Level Monitoring Water level monitoring will be conducted with data logging pressure transducers and hand water level measurements. The pressure transducers will be installed in up to six of the monitoring wells. The following two schedules have been identified for the hand water level measurements: Pumping and Basin Filling Changes: During periods of site operation changes, hand water levels will be measured at approximately 30 minute intervals for a period of about two hours. If equilibrium conditions are not achieved,the field scientist or engineer will make a decision to progressively decrease the frequency of water level measurements until stable water levels are observed. Equilibrium Water Level Conditions: After groundwater levels have stabilized, measurements will be made approximately twice daily. The water level monitoring activities may be adjusted to coordinate with other site activities, such as the pumping of groundwater and filling of the infiltration basin. Hand water levels to date are included as Attachment A. Current Conditions Update This test has begun and is currently in item 5c from above. Data collection is on-going and the interpretation is still incomplete. However, initial evaluations of data have yielded the following preliminary data: • Hydraulic conductivity o hydraulic conductivity estimates obtained from pump tests have ranged from 800 to 2000 ft/day F:14740007_031CorrespondenceUnfltralon Test Water Monitoring Memo Weld USR 8-24-06 dra0.doc INFILTRATION TEST PLAN-NORTH CAMPUS PRAIRIE WATERS PROJECT ■ Infiltration rate o infiltration rate estimates range from 7 to 9 ft/day • Hydrographs of groundwater level conditions. Attached are representative hydrographs of monitoring wells that create a cross section across the test basin. (Figures 2 through 15) Data collection and interpretation will continue until sufficient data has been obtained from the variations in basin operations and construction. F:14740_007_031Correspondencellnfilfa ion Test Water Monitoring Memo Weld USR 8-24-06 draft.doc APPENDIX A HAND WATER LEVELS 00/ o i i C _. 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CZ C�') ` ,-t I:2 � Ilr ^ 'IO O N N N N N NN N N NN N 1 to tO m ID CO CO m CO m ID tD m ID CO CO CO m m m 11 CD m r '.I.- n r r n n n n n N I.R:-. n l n - Inn r n ,n n n r r n r n r n n r n n I 4 i I I Technical Memorandum TETRA TECH Prairie Waters Project North Campus: Land Management Strategy PREPARED FOR: CITY OF AURORA PREPARED BY: Tetra Tech DATE: August 2006 Summary This technical memorandum presents the short and long term re-vegetation and land management plan on parcels owned by the City of Aurora (City) for the Prairie Waters Project's ARR Site A in Weld County. Three stages of development will require a phased approach to the land management. These phases have been designated as "Pre-construction," "During Construction," and "Post Construction" (See Exhibits Al, A2, and A3). The goals and benefits of the program are summarized below: Goals • Preserve and manage the existing riparian corridors • Establish a temporary cover crop on the existing cropland • Establish a healthy stand of short-grass prairie • Improve the visual quality of site, so that ultimately the land becomes sell-sustaining and a benefit to the environment • Meet state and local permitting requirements Benefits • Prevent excessive soil and water loss • Improve water quality • Provide guidelines for long term weed management • Established plantings provide valuable wildlife food and cover Site Description, Weld County The Weld County site encompasses 393-acres. At the present time, the existing cover conditions include agricultural crop residue, open areas of native grasses with pockets of weeds and mature riparian species (trees, shrubs, and grasses) along Big Dry Creek and Lupton Bottom Ditch (See Exhibit Al). The majority of the site has been previously farmed and is currently corn stubble (< 12" in height), recently treated with herbicides for weed control and seeded with sorghum. PRAIRIE WATERS PROJECT Page 1 of 8 LAND MANAGEMENT STRATEGY WELD COUNTY USR Descriptions of Land Management Strategies Several land management strategies are recommended for this site and implementation of temporary landscape management strategies have already commenced. The following sections provide an overview of each strategy,benefits,and a detailed description of the implementation process (see Exhibits Al, A2, and A3,and the "Land Management Timeline" memo). On an Annual Basis: Existing grassland & riparian corridors to be maintained by a weed management company. Overview: A weed management company was hired in May 2006 to assess and treat Site A for noxious and perennially invasive weeds. Benefits: Weed management is essential to the successful establishment of prairie grasses. Additionally, weed management is a regional issue and eradication of noxious species on this site will help reduce any risk of local weed infestations. Implementation: Pesticide applicators are required to be licensed by the Colorado Department of Agriculture. All herbicides will be approved by Aurora Water and the Weld County Weed Division prior to application. All herbicides are to be applied per label instructions. Mowing will occur as necessary to control weed species, and prevent seed formation. Mowing on existing crop fields will initially be done in spring, and depending on precipitation rates additional mowing may be need. Several jurisdictional wetlands are located on site. These areas shall be assesses and treated for noxious and perennially invasive weeds with approved herbicides. Herbicide applications shall be applied per the label instructions by a licensed pesticide applicator. When properly applied these herbicides shall not negatively impact the wetlands or adjacent waterways. Herbicides currently approved for use by the Aurora Water and Weld County: Herbicide Rate/Acre Target Species Transline 12 to 16 oz. Thistles, Knapweeds, etc. Telar 1 to 1.75 oz. Thistles, P. Pepperweed, Hoary Cress Milestone 5 to 7 oz. Thistles, Knapweeds, etc. Plateau 4 to 12 oz. Leafy Spurge, Downy Brome Journey 12 to 32 oz. Leafy Spurge,Downy Brome 2,4-D 4# 1 to 2 qt. Many(aquatic label) 2 LAND MANAGEMENT STRATEGY WELD COUNTY USR TEMPORARY(MAY OCCUR ANNUALLY UNTIL CONSTRUCTION OCCURS) Existing crop stubble treated with herbicide, and planted with sorghum cover crop Overview: Annual cover crop to be grown until permanent grasslands can be established. Benefits: Weed management is essential to the successful establishment of the prairie grasses. Additionally weed management is a regional issue and eradication of noxious species on this site helps reduce the risk of local weed infestations. Implementation for establishing a cover crop : The recommended cover crop is Hybrid Sudan Sorghum var.Arikaree. Seed bed preparation: Fields or areas that are too Bullied,hummocky or in need of mechanical conservation measures should be shaped as necessary to plant and grow a suitable cover crop. The ground should be worked no more than twice, typically with chisel and harrow or disc and harrow until a weed free firm seedbed is prepared. Fertilizer application should be according to soil test recommendations in order to grow an effective cover. Planting: The cover crop will be drilled rather than row cropped. The maximum width will be 20 inches. The desirable width will be 12 inches. For clay and loam soils drill between May 15th to June 30th, and drill between 6 to 8 pounds to the acre. Normal planting depth will be one inch. Harvesting: Minimum stubble height (12 inches) of dead litter should be left at the end of the growing season to prepare for the next crop. Stalks should be strong and well rooted with a minimum circumference of 1/2 inch at the base. Irrigation: Supplemental irrigation may be necessary if there are drought conditions during the establishment period. Existing alfalfa/hay cover crops to remain with weed control Overview: Existing fields of alfalfa/hay should be mowed as necessary with a mulching style rotary mower. Benefits: Mowing the existing fields of alfalfa/hay maintains the existing cropland in good condition by controlling the spread of weeds, and preventing erosion. 3 LAND MANAGEMENT STRATEGY WELD COUNTY USR Implementation: Allow alfalfa/hay to grow throughout the season without irrigation. Mow alfalfa/hay fields in June to control weeds. Note: If the area receives high amounts of moisture, additional mowing may be needed in the fall. This will completed on a yearly basis, and depending on the type of weeds to be managed there may need to be additional mowing required. DURING CONSTRUCTION Existing alfalfa/hay crops to be removed and planted with sorghum crop. Overview: Existing hay is to be killed with an herbicide application. Annual cover crop to be grown until permanent grasslands can be established. Benefits: Weed management is essential to the successful establishment of the prairie grasses. Additionally weed management is a regional issue and eradication of noxious species on this site helps reduce the risk of local weed infestations. These areas will also be flexible during the construction phase. Implementation for establishing a cover crop : The recommended cover crop Hybrid Sudan Sorghum var. Arikaree. Seed bed preparation: Herbicide application to kill existing hay. Planting: The cover crop will be drilled rather than row cropped. The maximum width will be 20 inches. The desirable width will be 12 inches. For clay and loam soils drill between May 15th to June 30th and drill between 6 to 8 pounds to the acre. Normal planting depth will be one inch. Harvesting: Minimum stubble height(12 inches) of dead litter should be left at the end of the growing season to prepare for the next crop. Stalks should be strong and well rooted with a minimum circumference of 1/2 inch at the base. Irrigation: Supplemental irrigation may be necessary if there are drought conditions during the establishment period. POST CONSTRUCTION(PERMANENT) Permanent Establishment&Maintenance of Short-Grass Prairies Overview: After final grades have been established and construction has been completed the prairie grass will be seeded. The areas to be seeded with the short-grass prairie mix will also include other areas in Weld County disturbed as part of construction (for example areas disturbed by the installation of the pipeline). Preparation for the seeding of the prairie mix will begin the 4 LAND MANAGEMENT STRATEGY WELD COUNTY USR preceding spring. This will begin with additional preparation to the seed bed before the sorghum is planted. The prairie grass seeding will then occur the following winter. Additional maintenance will be necessary for three years after planting to ensure successful establishment. Benefits: Re-vegetation of the land into the native short grass prairie grasses will restore the plant community that has been eradicated by agricultural practices and over grazing. The short grass prairie is indigenous to Colorado and through proper land management practices (weed control) will become a self-sustaining environment in perpetuity. Implementation for establishing the Short Grass Prairie: Method: A dead litter stubble of cover sorghum will be left standing to give maximum protection from blowing. Harvested sorghum with a stubble height of 12 inches or more may be used,providing there is adequate cover to protect the grass seedlings and the soil from wind and water erosion for several years following grass seeding. Weeds and volunteer sorghum will be controlled as needed to prevent competition with the grass seedlings. Seeding: Grass seed mix will be seeded with the type of grassland drill recommended by the NRCS and described below. Grasses will be seeded according to the rates and dates stated on the plans. Grasses will be seeded directly into the cover crop stubble after November 15th (as long as the soil is not frozen) and no later than April 15th the next spring. If irrigation water is available seeding can take place at later dates. Seed: Seed will be placed at a depth of 1/4 inch to 1/2 inch. Seed will be certified and must originate from a point no more than 200 to 250 miles south and/or 100 to 150 miles north and/or 200 miles east or west of the site to be planted. All seed tags will be kept and given to NRCS along with receipts for purchased seed. Seed tag must show a test date no more than 12 months prior to the date of seeding. Equipment: An approved grassland drill has 7 to 12 inch spacing between double disc furrow openers with depth bands on every disc, packer wheels, seed box with agitator and picker fingers,and a separate small seed box. The seed tubes will drop seed between disc openers-not behind them. Maintenance: All seedlings must have adequate maintenance to insure proper establishment of the seeded species, including: o Any areas that are damaged by wind or water erosion will be shaped, if needed, and re-seeded. o Weeds should be controlled until grasses are fully established,but most especially the first 2 or 3 growing seasons. Control methods may include any or all of the following: • Mowing-weeds should be mowed prior to flowering before the seeded species are impacted (2-3 times per season). Mowing can take place when grasses have reached a height of 6+ inches. 5 LAND MANAGEMENT STRATEGY WELD COUNTY USR • Herbicides can be applied to introduced grasses when the seedlings are at the 4 to 5 inch leaf stage. • Seed Mix PLS rates PLS/Ae Min,Rate Species Variety Ire to use PLS 1b1Ac /•in Mix Non-Irr (100%) Western Wheat Ariba or 16.0/8.0 8.0 1.6 20 Grass Barton Sideoats grama Vaughn or 9.0/4.5 4.5 0.9 20 Butte Blue grama Hachita or 3.0/1.5 1.5 0.4 25 Lovington Buffalograss(bur) Texoka, Bur 16.0/8.0 8.0 1.6 20 Green Needle Grass Lodorm 10.0/5.0 5.0 0.8 15 5.3 100 Shrub Plantings Overview: Shrub beds are proposed adjacent to Weld County Road 8 and along the southern most property boundary. Shrubs shall be installed as seedlings to promote acclimation to the site conditions. Benefits: Plantings add visual interest to the landscape with seasonal color form and texture. They provide food and cover and corridors for wildlife, provide screening and barriers. Implementation of the Shrub Plantings: • Seed bed preparation: Apply herbicide in early spring to kill new weed growth when it first begins to emerge. Roto-till before planting. Install filter fabric. All edges shall be buried to a depth of±6 inches. Additionally, metal staples shall be used secure the fabric. Cut 12 inch by 12 inch crosses in the fabric where seedlings are to be planted per plans. Planting: Plants shall be bare-root seedlings, and planted by May 30th. Leave bare root bundles intact and store in a cool place (under 50 degrees Fahrenheit) if planting is to occur within 48 hours of delivery. If planting is not planned for more than two days, open the bundle, separate the seedlings and place them in a trench,cover the roots with loose soil, and fill the trench with soil. Keep the soil in the trench moist and protect the roots from exposure to air. • Create a slurry by mixing a shovelful of soil, in a five gallon bucket half-filled with water. Open the bundle and place seedlings immediately into the bucket, submerging the roots completely in the slurry. Plant as quickly as possible. (Do not store seedlings this way for more than two hours or root death may occur.)Dig a round hole at least one foot in diameter. Make a small mound of soil in the bottom of hole. Take the seedling from the 6 LAND MANAGEMENT STRATEGY WELD COUNTY USR bucket of slurry and spread the roots out in all directions using the mound as a root support. Pull loose soil back over roots, filling the hole half way. Lightly tamp soil down or fill with water. Then, back fill the rest of the hole, tamp soil again or re-water. Do not compact the soil by tamping wet soil. • Irrigation: Water seedlings 1 gallon of water per seedling per week. A water truck may be used for watering. All irrigation water should be free of pollutants. • Install tree guards to prevent browsing damage from wildlife. • Species: Common Name Botanical Name Nanking Cherry Prunus tomentosa Common Chokecherry Prunus Virginiana Yellow Flowering Currant Ribes Aureum Three Leaf Sumac Rhus trilobata Silver Buffaloberry Shepherdia argentea 7 REFERENCES National Resource Conservation Service Technical Field Memorandums • Cover crop recommendations • Prairie Grass establishment and maintenance Weld County Weed Division • Weed control, and selected herbicides Colorado Forest Service • Seedling planting recommendations PRAIRIE WATERS PROJECT Page 8 of 8 . , • z , o an > W QcnzQ � Hz < ILL' w it4k3/4, Ialzwg wO. .11La . 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I+�� 'I �• -_ ? o Li�J 6 — =:- ` — Its .i ri el i __ SI if a. i- 2 Ipaall IL GO §'� .—_-•' .;: .'.: - �.�.► � �. � •: �' ■ or V• gliiir .._.1 . • S. Ill -� ... III 2.. (,t .� ' '.7 _ 1©i� 0 - U..I ' i - ,o1 v I •I'� J Z W . EZUOM EZ2:1OMii 42, < t a. O . Naal0 Aii0_010 co § LT 44 it i O w Ni - o ° 1~ ZZ I C99 11 Q (1) CL Ew -- 1 z-1i WETLANDS DELINEATION WELD COUNTY USR 4 Aurora has prepared a wetlands delineation and is working with the USACE towards concurrence. This report as well as correspondence with USACE will be forwarded upon receipt. PRAIRIE WATERS PROJECT PAGE 1 ENT ' N\Il/y., r' . United States Department of the Interior ''s= ''' FISH AND WILDLIFE SERVICE �4eccA`"` Ecological Services Colorado Field Office P.O.Box 25486, DFC(MS 65412) Denver,Colorado 80225-0486 IN REPLY REFER TO: ES/CO: T&E/Concurrence MS 65412 LK MAY - 82006 Mark Pither City of Aurora 15151 East Alameda Parkway, Suite 3600 Aurora,Colorado 80012 Dear Mr. Pifher: The U.S. Fish and Wildlife Service(Service)received your letter of March 21, 2006, and accompanying report by ERO Resources Corporation regarding the City of Aurora Prairie Waters Project, Weld,Adams, Denver,and Arapahoe counties, Colorado. You requested concurrence that the proposed project would not affect federally-listed threatened or endangered species. The following comments have been prepared based on the authority conferred to the Service by the Endangered Species Act of 1973 (ESA),as amended(50 CFR §402.14). Based on the information you have provided,the Service concurs that the proposed project is not likely to affect threatened or endangered species. Be aware that if additional information regarding listed or proposed species becomes available, this determination may be reconsidered under the ESA. The federally-listed bald eagle is increasing as both a nesting species and winter resident through the project area. Information on eagle occurrence, especially nesting sites and winter night roost sites, should be updated as the project plans are finalized and the project is implemented. If the Service can be of further assistance, contact Peter Plage of this office at (303)236-4750. Sincere y, - doviet_ (401.a Susan C. Linner Colorado Field Supervisor i (` cx P3 t'cw e_( -L1-) mp k ; United States Department of the Interior k` -i FISH AND WILDLIFE SERVICE ---►° Ecological Services 764 Horizon Drive,Building B Grand Junction,Colorado 81506-3946 IN REPLY REFER TO: ES/CO:FW S/ES/Spiranthes TAILS 65413-2006-I-0102 July 25,2006 Mark Pifher City of Aurora Water Resources 15151 E. Alameda Parkway, Suite 3600 Aurora, Colorado 80012 Dear Mr. Pifher: • Based on the authority conferred to the U.S.Fish and Wildlife Service(Service)by the Endangered Species Act of 1973 (ESA),as amended(16 U.S.C. 1531 et seq.), the Service has reviewed the habitat assessment report for Spiranthes diluvialis (Ute ladies' tresses orchid), Gaura neonrexicana spp. coloradensis(Colorado butterfly plant),black-footed ferret(Ivfustela nigripes), Preble's meadow jumping mouse(Zapus hudsonius preblei), and bald eagle (Haliaeetus leucocephalus)submitted with your letter of March 31, 2006. This report regards the proposed City of Aurora Prairie Waters Project in the Denver Metropolitan Area, Colorado. Given the negative habitat assessments conducted by ERO Resources Corporation, the Service agrees that suitable habitat for the orchid and the butterfly plant, as well as for the black-footed ferret and Preble's meadow jumping mouse is not present within the project area. Thus, the Service concurs with the determination that the impacts resulting from the proposed project are not likely to adversely affect these species. Regarding the bald eagle, the report states that construction could occur within '!2 mile of a known eagle nest and a communal roost. The Service recommends the following buffer zones and seasonal restrictions for avoiding disturbance to bald eagles. Nesting Conservation Measures Year round No Surface Occupancy within Y4 mile radius of both occupied and unoccupied nests. Definition of`occupied nest' [from Northern States Bald Eagle Recovery Plan 1983, page D4] : a) young were observed, b)eggs were laid (eggs or eggshell fragments observed), c) one adult observed in incubating ("sitting low") posture on the nest during the incubation period,d) two adults observed at an empty nest or within the breeding area, and e) one adult and one eagle in immature plumage at or near a nest, especially if mating or reproductive behavior(display flights,copulation, nest repair, etc.)was observed. • No human activity or other permanent surface disturbance within %2 mile radius of occupied nests from November 15 through July 31. No Surface Occupancy within 100 meter radius of abandoned nests (unoccupied for 5 consecutive years, but with all or part of the nest remaining). Winter Conservation Measures Human activities within '/, mile of known winter hunting perches and %2 mile of critical night roosts should be restricted from November 15 to March 15. Buffers can be reduced to '/,mile for night roosts and %g mile for hunting perches if the activity is visually screened by vegetation or topography. Development may be permitted at other periods. If periodic visits (such as oil well maintenance work) are required within the buffer zone after development, activity should be restricted to the hours of 1000 and 1400 hours from November 15 to March 15, Exceptions will require consultation for each individual action. Avoid cutting down any native tree that is 12 inches dbh or greater, and within 100 feet of a river bank or other foraging area. Exceptions will require consultation for each individual action. If you are unable to comply with the above bald eagle measures, additional consultation will be required. We appreciate your submitting this report to our office for review and comment. If the Service can be of further assistance,please contact Ellen Mayo at(970) 243-2778, extension 14, or ellen_mayo@fws.gov. Sincerely, Allan R. Pfister Western Colorado Supervisor cc: COE,Littleton EMayo:FWSESCityofAurofaPrairic WatasProjcctSpirantLesSurveyLtr.doc:07250G 2 TECHNICAL MEMORANDUM RESULTS OF THE CLASS I FILE AND LITERATURE SEARCH CULTURAL AND HISTORIC RESOURCES PRAIRIE WATERS PROJECT-NORTH CAMPUS (INCLUDING THE WELL FIELD AND CONVEYANCE SYSTEM) REVISED,MARCH 2,2006 Introduction On behalf of MWH,Colorado Historical Society Office of Archaeology and Historic Preservation(CHS OAHP)conducted a file search for the North Campus properties, including the proposed well field and conveyance system(North Campus), associated with the proposed Prairie Waters Project(PWP). Legal location of the file search area was provided to OAHP as GIS shape files; results of the file search were provided to ERO Resources Corp. (ERO) in the same format. The North Campus search area addressed by this memorandum is located along the South Platte River, near Brighton, Colorado, and includes the North Campus properties, proposed well field, and conveyance system, with a 1,000-foot file search buffer around the perimeter of the search area(see Table I for legal locations). The purpose of the file and literature search was to compile information on whether any cultural resource sites that are listed in the National Register of Historic Places(NRHP), potentially eligible for listing in the NRHP, or which require additional data prior to a NRHP eligibility determination, are located within the search area(Table 1). The file and literature search resulted in the identification of seven previous cultural resource inventory surveys conducted in the area(Table 2),which documented 14 sites (Table 3) within the search area(Table 1). The North Campus properties are located primarily in Weld County; the southern portion of the North Campus is located in Adams County. 1 ERO Resources Corporation TECHNICAL MEMORANDUM RESULTS OF THE CLASS I FILE AND LITERATURE SEARCH-CULTURAL AND HISTORIC RESOURCES PRAIRIE WATERS PROJECT-NORTH CAMPUS Table 1. Legal Location for Selected Project Locations. Facility Type Legal Location North Campus TIS/R66W,all or portions of Sections I and 6; Brighton U.S.G.S.7.5' quadrangle TI S/R66W,all or portions of Sections 36,31,30,25,24, 19, 13,and 18;Fort Lupton U.S.G.S.7.5'quadrangle Previous Surveys Seven previous cultural resource inventories have been conducted within the North Campus search area(Table 2). Table 2. Previous Cultural Resource Surveys Undertaken Within the North Campus Search Area. Total Survey Cultural Survey ID# Survey Name Resources in Acreage Current Project. Top of Form Electrical Development in the United States Unknown 5 W L3154.2 MC.E.R41 MC.CPO.R27 Colorado Farm and Ranch Inventory,Weld Unknown 5WL.I385 County 5 W L.1386 5WL.1387 5WL.1388 MC.CH.RI25 Adams/Weld County Line Project 9.8 5WL.945 5AM.371 MC.CH.B Colorado Bridge Survey,CDOT Unknown 5AM.258 MC.CH.R6l Adams/Weld County Line Project at South Platte Unknown 5AM.258 River WL.E.RI6 KN Wattenberg Transmission Line 227.7 5WL.2650.1 5 W L.2652.I WL.CH.NR8 Bridge Replacement Survey on Weld County Road 1.2 None in current 6,CDOT project area Note: Sites 5WL.1040 and 5AM.31 could not be placed with a specific survey. Five of the recorded sites were documented as a result of the Colorado Farm and Ranch Inventory. The remaining inventories include transmission line development, a pipeline, and Colorado Department of Transportation(CDOT) projects. Cultural Resource Sites Fourteen cultural resource sites were identified in the North Campus search area. Of the 14 total cultural resource sites identified in the area, eight sites are recommended field not eligible(5WL.3154.2, 5WL.1040, 5WL.1385-5WL.1388, and 5AM.31); three are 2 ERO Resources Corporation TECHNICAL MEMORANDUM RESULTS OF THE CLASS I FILE AND LITERATURE SEARCH-CULTURAL AND HISTORIC RESOURCES PRAIRIE WATERS PROJECT-NORTH CAMPUS officially not eligible(5WL.945, 5AM.371, and 5 WL.2650.1); one site is recommended as officially needs data(5WL.2652.1); one site is officially eligible(5AM258), and one site is recommended field not eligible (5WL.751). Table 3. Cultural Resources Previously Documented Within the North Campus Search Area. Smith.ID. Site Type Site Name UTM NRHP Assessment Coordinates 5WL945 Historic Feature McCanne Ditch Linear Officially Not Eligible (numerous) 5WL75 1 Historic Feature Boulder Valley Railroad 13 Field Not Eligible Grade Crossing 513420 mE 4427600 mN 5WL1040 Historic Feature Powars Station(Railroad) 13 Field Not Eligible 516420 mE 4431940 mN 5WL1385 Farm Complex None 13 Field Not Eligible 512900 mE 4431520 mN 5WL1386 Farm Complex None 13 Field Not Eligible 512900 mE 4432720 mN 5WL1387 Farm Complex None 13 Field Not Eligible 512900 mE 4432700 mN 5WL1388 Farm Complex None 13 Field Not Eligible 512900 mE 4433500 mN 5WL1413 Farm Complex None 13 Field Eligible 513290 mE 4429080 mN 5WL2650.1 Historic Feature Brighton Ditch Linear Officially Not Eligible (numerous) 5WL2652.1 Historic Feature Lupton Bottoms Ditch Linear Officially Needs Data (numerous) 5WL3154.2 Historic Feature Hoyt St.to Terry St. Linear Field Not Eligible Transmission Line (numerous) 5AM3I Historic Boulder Valley Linear Field Not Eligible Railroad (numerous) 5AM258 Historic Feature Baseline Bridge 13 Officially Eligible 514788 mE 4427604 mN 5AM371 Historic Feature McCanne Ditch Linear Officially Not Eligible (numerous) 3 ERO Resources Corporation TECHNICAL MEMORANDUM RESULTS OF THE CLASS I FILE AND LITERATURE SEARCH-CULTURAL AND HISTORIC RESOURCES PRAIRIE WATERS PROJECT-NORTH CAMPUS All of the 14 sites documented within the North Campus search area are historic site types. Five of the sites are farm complexes, none of which have Centennial Farm status (a state program that recognizes historic farms, single owners, greater than 100 years old) and only one of which is recommended field eligible (5 WL.1413). Five of the sites are historic linear types, including a transmission line(5 WL.3154.2),the Lupton Bottoms Ditch (5WL2652.1), the McCanne Ditch(5WL.945/5AM.371), and a segment of the Boulder Valley Railroad(5AM.31). The remaining sites are related to railroad operations and transportation, including a grade crossing of the Boulder Valley Railroad (5 WL.751), the Powars Station of the Denver-Pacific Railroad(5WL.1040), and the Baseline Road bridge(5AM.258). Of the 14 sites documented, only three sites are potentially eligible for listing in the NRHP: 5WL.1413 (farm complex), 5AM.258 (Baseline Road bridge), and 5WL2652.1 (Lupton Bottoms Ditch). Summary and Management Recommendations A total of 14 archaeological resources have been documented within the North Campus search area. Eligible or potential eligible sites 5AM.258, 5 WL.1413, and 5WL2652.1 are all located within the 1,000-foot search area but outside proposed facility footprints and will not be impacted by ground disturbing impacts if constructed as currently proposed(Figure 1). All sites recommended field not eligible must be reviewed by SHPO and a concurrence of eligibility rendered prior to any of these sites being impacted by construction. The North Campus Project Manager and ERO need to coordinate to ensure that the three sites listed above are not adversely affected by project construction. 4 ERO Resources Corporation • it ( . Ilk -- tertnarM • ( _ •1 si -lt i . _ . . _ . .. i. . 5WL.1040 rF , 'p c_ _ -_ - 44, - .. • . • SM.sas< 1"h...7 - . Wl .• 1 ` ` 1 ) (36 I \i I, a 5WL.1/13 - . • 1 •_ i s.. _ I • w. a. .":11 . _ 17•. �i 6Wt •1 MCCH R128 I • Yt r 11).- : cum) r �1 i 1 ' 1 r 4 t - I f0 Prairie Waters Project Search Area Figure 1 City of Aurora nu North Campus Properties Cultural and Historic Resource Search ERO Resources Corp. IMII Previous Cultural Surveys North Campus 1842 Clarkson StreetNM Cultural Sites N Denver,CO 80218 0 1,250 2,500 /1 (303)8341188 Feet N Prepared for: MWH Americas Fax: 830 1199 lint.=2501 FM Fr2599•nortttcampus and well lkb cu buret]1x17.mxd (Sft) February 27,2006 Consultants in natural resources and the environment Denver • Boise • Durango EVAI.t JATION OF POTENTIAL EFFECTS ITo FEDERALLN LISTED SPECIES IN THE VICINITY OF THE CITY OF AURORA PRAIRIE WATERS PROJECT I ' Prepared Pr— City of Aurora Utilities OP Division 14707 E. 2nd Avenue, Suite 150 Aurora, Colorado 80011 01 For Submission to— U. S. Fish and Wildlife Service Ecological Services Colorado Field Office P.Q. Box 25486, DFC (MS 65412 ) Denver, Colorado 80225-0486 Prepared hr ERO Resources Corporation ' 1842 Clarkson Street Denver, Colorado 80218 1 11O J March 21 , 2006 ERO Resources Corp. 1842 Clarkson S+reef Denver, CO 802 ) 8 ( 303 ) 830 - 1188 Fox: (303; 830- 1199 www e•oreso:,rces corn e rces.corn MO Resourre Concretion CONTENTS 1.0 Project Description 1 2.0 Previous Coordination with the U.S. Fish and Wildlife Service 2 3.0 Methods z 4.0 Project Area Description ; 5.0 Federally Listed Species With Potential to Occur in the Project Area 3 5.1 Bald Eagle 3 5.2 Black-footed Ferret 4 5.3 Colorado Butterfly Plant and lite Ladies'-tresses Orchid 5 5.4 Prcble's Meadow Jumping Mouse 6 6.0 Conclusions 7 7.0 References 3 Attachment 1: U.S. Fish and Wildlife Service comments dated May 19, 2005 TABLES Table 1. Federally threatened and endangered species with potential to occur within the vicinity of the Prairie Waters Project 3 FIGURES Figure 1. Project location. Figure 2. Habitats with potential to support federally listed species. Figure 3. Prehle's meadow jumping mouse locations in the vicinity of the North Campus. EVALUATION OF POTENTIAL.EFFECTS TO FEDERALLY LISTED SPECIES IN TIIE VICINITY OF CITY OF AURORA PRAIRIE WATERS.PROJECT MARCH 21,2006 1.0 Project Description The City of Aurora CIP Utilities Division is designing the Prairie Waters Project (previously referred to as the South Platte Project). During severe and protracted drought conditions,the City of Aurora has had to rely on aggressive conservation measures,over- drafting of the various reservoirs and short-term leases to supplement the yields of its core water rights portfolio. The City's ability to meet customers' water needs in the future will require the addition of a new and significant water source by Year 2009- The Prairie Waters Project(Project)will provide that source of water and represents the best alternative, from a water rights, environmental, and engineering perspective, for meeting the City's near-term demand. The Project is necessary, regardless of any other specific long-term system enhancements that may be implemented by Aurora. The Project will consist of three primary components: 1)an alluvial well system located along the South Platte River that would collect the City's reusable return flows and recharge this water using rapid infiltration into an aquifer recharge and recovery system for natural treatment(North Campus);2)a pumping station and pipeline system that would convey the water approximately 34 miles to the Aurora Reservoir area (Pipeline); and 3)a conventional water purification facility located north of Aurora Reservoir that would treat the water tbr distribution through the City's existing potable water system(A.RWPF) and includes a blended water pipeline that will connect the new water purification facility with the existing Wemlinger Treatment Facility(Figure 1). All Project facilities and construction activities would be sited so as to avoid adverse impacts to sensitive resources,including wetlands and other waters of the United States. Project planning and design has been coordinated with and reviewed by the U.S. Army Corps of Engineers. The Project will not involve a discretionary federal agency action. The Project will not occur on federal lands.will not require federal authorization and does not p.'25i8;projceu'Z599 north dclivu y.yalcm!&t repo l'.prdine water:.project- -3-I-46 dm: EVALUATION OF POTENTIA1.EFFr-c-rs To FEDERALLY LIS lED SPECIES iN TIIE VICINITY OF CITY O1-AURORA PRAIRIE WATERS PKOJEC I involve federal funding. Although there is no discretionary federal action, Section 9 of the Endangered Species Act of 1973,as amended (ESA)and its implementing regulations prohibits unlawful take of fish and wildlife species that are federally listed as threatened or endangered under the ESA. This report addresses the potential of the Project to adversely affect federally listed species and/or their habitats in the Project area. 2.0 Previous Coordination with the U.S. Fish and Wildlife Service The City of Aurora and their consulting team met with the I.I.S. Fish and Wildlife Service(Service)on May 19, 2005 to discuss the Project and its potential effects upon federally listed species utilizing the Platte River in Nebraska. Responding to a letter from the City,the Service stated that: "In your May 26,2005, letter, you presented three assumptions for addressing ESA compliance related to any potential depletive effects of the subject Project on Federally-listed species in Nebraska. If these assumptions prove to be true,that is, a Platte River Recovery Implementation Program (Program),which covers Aurora's South Platte Project, is in place(established and implemented)and the City has demonstrated that there is no federal nexus with the Project; then, the Service would concur that implementation of the Program would provide the necessary ESA compliance for the potential depletive effects of the Project to listed species in Nebraska"(Attachment 1). This previous coordination with the Service did not address any potential effects of the Project on federally listed species and/or their habitats in the Project area. This report addresses potential effects to federally listed species in the Project area. 3.0 Methods During 2005 and 2006,ecologists with ERO Resources Corporation reviewed properties proposed to be included within the project area for habitats for federally listed species. This included the footprints of the proposed North Campus, a 160-foot wide alignment of the pipeline, the blended pipeline alignment and a proposed footprint of the ARWPF. The pipeline alignment, buffer width, and footprints of the North Campus and ARWPI' were provided to ERO Resources by M WH,.l'etra'I'ech and CI-12M Hill, the City of Aurora's engineering consultants. EVALUATION OF Poit?rrIAI.EFFECTS To FEDERALLY LISTED SPECIES IN THE VICINI1 V OF CITY OF AURORA PRAIRIE WATERS PROJECT 4.0 Project Area Description The Project area covers approximately 34 linear miles from north of Brighton in Adams County to near Aurora Reservoir in Arapahoe County(Figure 1). Most of the Project area is comprised of lands that have a history of disturbance from agriculture, aggregate mining,oil and gas production, and urbanization. The North Campus component of the Project occurs in the vicinity of the South Platte River. The South Platte River corridor and its riparian habitat has the greatest potential in the Project area to support federally listed species. 5.0 Federally Listed Species With Potential to Occur in the Project Area Construction of the proposed Project is not expected to adversely affect any federally listed species that could occur in the vicinity of the Project. There is no federally designated critical habitat in the Project area. Several federally listed species potentially could occur in the vicinity of the Project(Table I). Table 1. Federally threatened and endangered species with potential to occur within the vicinity of the Prairie Waters Project. Potential to be Common Name Scientific Name Federal Status Found in the Project Area Bald eagle flaliaeetus leucocephalus Threatened Present along the South Plane River Black-footed ferret +llusrela nigripes Endangered Low Colorado butterfly plant i Gaura newnexicana ssp. Threatened Low coloradensis Preble's meadow jumping 7.npus hudsonius preblei Threatened Low mouse the ladies'-tresses orchid Spiranthes diluvialis Threatened Low The South Platte River and its associated riparian habitats provide habitat for bald eagles and could provide habitat.for Preble's meadow jumping mouse, lte ladies'-tresses orchid and the Colorado butterfly plant. Additionally, black-tailed prairie dogs colonies in the vicinity of the Project could potentially support the black-footed ferret. 5.1 Bald Eagle Bald eagles have the potential to occur occasionally throughout the Project area during the winter as they hunt for prey. Bald eagles are commonly observed along the EVALUATION OF POTENTIAL EFFECTS To FEDERALLY LISTED SPECIES IN Tt tE VICINITY OF GiTY OF AURORA PRAIRIE WATERS PROJECT South Platte River in Adams and Weld counties. A communal winter roost at the Rocky Mountain Arsenal National Wildlife Refuge,about 10 miles south of the North Campus, supports the largest concentration of wintering bald eagles in the area. Eagles from the Refuge range widely during the day, occasionally using the riparian habitats and nearby prairie dog colonies along the South Platte River in Adams and Weld counties. One bald eagle pair has recently established a nest at the nearby Wattenburg aggregate mining site. This nest occurs between the southern and northern portions of the North Campus, but does not occur within the North Campus properties(Figure 2). An active winter communal roost site for bald eagles also occurs in the vicinity of the nest site,but does not occur within the North Campus properties(Figure 2). The Service has proposed to delist the bald eagle. If delisted, the bald eagle would remain protected under the Migratory Bid Treaty Act and the Bald and Golden Eagle Protection Act. No bald eagle communal roost sties or nests are known within the Project area. The City will continue to monitor the Project vicinity periodically for bald eagle use. The City will coordinate with the Service regarding any Project construction within 0.5-mile of a known bald eagle nest or communal roost if construction would occur during the time of year when bald eagles may be present in the area. 5.2 Black-footed Ferret Black-footed ferrets are associated with prairie dog colonies where they depend on this species for food and shelter. The Service has developed a block clearance zone for the Denver metropolitan area, which includes Arapahoe and Adams counties, within which no surveys are required. Currently the portion of the project within Weld County is outside the current block clearance zone. In 1992, this area was proposed for inclusion in the black-footed ferret block clearance area. Current FWS criteria for defining potential black-footed letTet habitat consist of any black-tailed prairie dog town or complex of greater than 80 acres(FWS 1989). Prairie dog colonies occur within the Project area,but all of the colonies are less than 80 acres (Figure 2). Taken as a complex,there are more than 80 acres of prairie dogs within the project area in Weld County. The City will coordinate with the Service on the need for a 4 EVALUATION OF POTENTIAL EFFECTS To FEDERALLY LISTED SPECIES iN THE VICINITY OT CITY OF AURORA PRAIRIE WATERS PROJECT black-footed ferret survey prior to construction in areas occupied by prairie dogs on the North Campus in Weld County. 53 Colorado Butterfly Plant and Ute Ladies'-tresses Orchid The Colorado butterfly plant is associated with riparian habitats, and Ute ladies'- tresses orchid is associated with wetland and riparian habitats along Colorado's Front Range. The wetland and riparian habitats of the South Platte River are the only portions of the Project area with potentially suitable habitat to support these species, but the potential is limited. The Colorado butterfly plant is not known to occur in the Denver metropolitan area. The open moist swale habitat associated with riparian habitats that typically support this species was not observed in the Project area. Ute ladies'-tresses orchid is known to occur on the west side of the Denver metropolitan area in Wheat Ridge along Clear Creek. Although numerous surveys have been conducted for this species,no locations of the orchid are known along the South Platte River in the Denver metropolitan area. • Drainages in the Project area other than the South Platte River(e.g.,Coal Creek, Senac Creek, First Creek,Second Creek, and Third Creek)do not provide potentially suitable habitat for the butterfly plant or orchid. These drainages arc either grossly disturbed (First Creek), are dry in the Project area(Senac Creek),or have riparian habitats that are too dry to support the butterfly plant or orchid (Coal Creek). Neither the orchid or butterfly plant were observed during wetland mapping and natural resource reviews of the Project area,and it is highly unlikely that these plants occur in the Project area. The Project is unlikely to adversely affect the Colorado butterfly plant or the Ute ladies'-tresses orchid because the best information available indicates that these species are not present in the Project area. Additionally, federally listed plant species are not afforded full protection from take under Section 9 of the ESA. The taking prohibition applies to plants when they are removed and reduced to possession from areas under federal jurisdiction or are on non-federal lands and are removed,maliciously damaged,or destroyed in violation of state law. The Lite ladies'- tresses orchid and Colorado butterfly plant are not currently protected by Colorado law. 5 EVALUATION OF POTENCEAL EFFECTS To FEDERALLY LISTED SPECIES IN THE VICINITY OF CITY OF AURORA PRAIRIE WATERS PROJECT 5.4 Preble's Meadow Jumping Mouse Preble's is known to occupy riparian habitats below 7,600 feet elevation along the Front Range from north of Colorado Springs to southeast Wyoming. Critical habitat has been designated for Preble's, but there is no designated critical habitat for Preble's within or near the Project area. Preble's has been proposed by the Service to be delisted; however, the Service has delayed a final decision on delisting until at least August 2006. Most of the Project area occurs within the Service's designated Denver metropolitan block clearance area for Preble's(Linnet.2004). The Service does not require surveys for Preble's within the block clearance area. Based on historical records and surveys and habitat assessments,the Service has determined that it is unlikely that Preble's occurs within the block clearance area. Portions of the pipeline and the proposed new water treatment facility occur west and south of the block clearance area boundary(Figure 2). Preble's is not known to occur in the drainages of the Project area that are west and south of the block clearance area(e.g.,Coal Creek, Senac Creek,First Creek, Second Creek, and Third Creek). These drainages are either grossly disturbed with little riparian habitat (e.g.,First,Second,and Third creeks),or have well developed cottonwood gallery woodlands with a sparse dry undcrstory(e.g., Coal Creek and Senac Creek). None of the drainages west or south of the block clearance area within the Project area provide the dense moist riparian shrub habitat that can support Preble's. The northern boundary of the block clearance area is the Adams/Weld county line (168`h Street or Baseline Road). The North Campus extends about 4.5 miles north of the northern boundary of the block clearance area. The majority of the North Campus occurs within 300 feet of the 100-year flood plain of the South Platte River(Figure 3). The Service considers areas within 300 feet of the 100-year flood plain to be potential habitat for Prcble's. A review of the Service's Preble's survey data base and ERO Resources' records indicates several negative trapping surveys and habitat assessments for Preble's within the vicinity of the North Campus(Figure 3). ERO Resources reviewed the North Campus properties and determined that the area of the potentially highest quality habitat for Preble's within the North Campus has been previously trapped with negative results. 6 EVALUATION OF POTENTIAL EFFECTS To FEDERALLY LISTED SPE.C'IF.S IN THE VICINITY OF CITY OF AURORA PRAIRIE WATERS PROJECT Based on site reviews and existing information on past negative trapping surveys and habitat assessments,ERO Resources has determined that the Project is unlikely to result in any take of Preble's, and additionally trapping surveys for Preble's in the Project area are not needed, for the following reasons: • The majority of the Project occurs within the Denver metropolitan block clearance area for Preble's. • Portions of the Project to the west and south of the block clearance area do not provide suitable Preble's habitat. • Portions of the North Campus that occur north of the block clearance area have been adequately trapped and evaluated with negative results for Preble's. • There are no known locations for Preble's within or near the Project area. 6.0 Conclusions As proposed,the Prairie Waters Project will not result in the take of any federally listed species or species proposed for federal listing. Five federally listed species have the potential to occur in the Project area(Table 1). The Project area was reviewed for each of these species and their potential habitats. Only the bald eagle is known to occasionally occur within the Project area,and there are no known nests or communal roosts in the Project area. Based on current projections,Project construction will likely begin in 2007 and conclude in 2009 or 2010. The City will continue to monitor bald eagle use in the vicinity of the North Campus and will coordinate with the Service if construction will occur within 0.5 mile of an active bald eagle nest or communal roost during the season when eagles are likely to be present. The city will coordinate with the Service prior to any construction in active prairie dog colonies in Weld County regarding the need to address any potential effects to black-footed ferrets. The City also will monitor new information on known locations of federally listed species in the Project area and any new listings of species in the Project area. Should the Project area change,the City will perform comparable reviews in the new portions of the Project area to determine if there will be any adverse effects to federally listed species. .7 EVALUATION OF POTENTIAL EFFECTS TO FEDERALLY LISTED SPECIES IN THE VICINITY OF CITY OF AURORA PRAIRIE WATERS PROJECT 7.0 References Linner, S.C. 2004. Letter from Susan Limier,Colorado Field Supervisor, U.S. Department of the Interior Fish and Wildlife Service to Mark Hunter, Urban Drainage and Flood Control. January 27. FWS(U.S. Fish and Wildlife Service). 1989. Black-footed ferret survey guidelines for compliance with the Endangered Species Act. Denver,CO and Albuquerque,NM. April. ZS , General vicinity of North Corn.us and well field • t «ice? / v - t Y! / •••4 •nstructi•n ct• .i . . • . ,' - p . tor ... r• 4e i ice` j C i w,..... 1 ea- :fWrtf tf f), \ ' c S .1 •••►'+ -t 1• 4 — _ - -•' r a ,, f. lineSe.ment 1 © . _ _ - 5 • UV* C•nstruct •n s • •m. •r<"• II P ,W.fr rh u) - • ..... . tk • nag"Om Ps. _ Sr* i �....•. i• �( ,� I .im• St.tivn < - � • . i t. M�••r.w•-.•T ` 4 r w L .4141•144a �. 1 . F•+• "r l....I 4 a s ft., • ' • tit.•r f I Si............... • ............. I in ... . 1. ►!btri.ti { - - ."�..•»....• ..... i�j ! .. ....„, ,�•� -I... ..•.......¢.• �..'(lstrvcti.n St• •In. . rC'• Y. .<o • 1 .•r a. ,.. ,`� ••r.. L.•.' Pump Station 2 •i• =Gne 5• •men? 3 • Agave { I I 11:1 1 N ( C•nSff{lCti•r` St• •In! •rC• �•.,*•,� I ~ r' ..,ii i ; I , �'j f • r il K`:rn!ingerWTP ti l� �I r• 1 '* • .1 ' GA•..•••. Quincy Blended Water Pipeline ., 1 it . a•..•, - i How Control Center e . ERO Proposed Prairie Waters Project Fig ure 1 :vow, a�:i^. ..n1 n.3r .; .iv � i,. " ... " O !�Uitt�l(. WArltit $ Frc-f:. 14.i.••t P. •r:: Propei't ttcotlon ft F_. •.. •.f t imet!rtidw,'Wae: Reef . n'•• • PS f im.-.•.:n ! . '!0 Wtn, Pvti-a4'r'. 4..•r •• 1 ' - ' ` ' r .•.a f J-'r>i Q4.•L'tW} 'm •• 9 . . ..1 N I. -.1 4 , .f^.{ .'- a•: .Ill - 4 E f - hit At dtol\Icin,ty ct ,` NcAb • ..ell Fl. . i I . d - 1 (a Cal it tochtNlto Nrld(ean(n !^ . II !✓i H. t . ,',..1• 1 . V. w S. `. - . -I ! _ F i I Brighton• �� i< .„ • I `� _:: \ •a • 1! �orol.ualcn•wglogo,ea - 14 c>� ,. .,....r .«._ -s II . I •• �: . � . r I /M .-i'hotnton a • • • i As' 4_ .I C . lac r_ -% t / 1 , ips. . — NorthQ/- r °�` •• �.,»+ ---• Is( n l..._— ` k , • . ♦ s I C.: •u^ • 1 :" 1. it /Comment* •City -a,. • • I :. a- —ie __J • w� I • rl • . Denys/ p I d• 1 I I • P/m,p Slaltan 2 . . tit: I ` A1 / i _.i__i r J j I • .1 re ".. ea I i • ' ., w --- -T _ �• • I I ••�••� 1 I — 1 I 1...-I-..i ir t : 1 a I I t • * . I l� 3 is si• t � ;_-,, i I • r, ..S r-- L i& — ° t0 , — -.,,,ill li. -;--- .e,-• -I ! .— i 1 i la Iw. •ii-k Y . Denver- I `'►w.`C I— �� L••fir" 1 '• tjam, r nu "I nt1 • ' '• . -�....�`4-_ - II,...---------.÷4...1....n-1„.....2_- ........_1...._--"-•--.'_-.-. ..►a_-...;..Ail—— .,mr A .._, f_ _'.....ii •! . ' :1 - •-• -- -- GEOMMei as••• .. I Lit- - -_ I - I T .- • 1 — .. ' ?Ma.= -I , • tt r► Ia.. 7--" ,, ay I �. �'<'�---r' _. — _ 1 lit . • to t1 . • ....._ \‘j 1- • I .,. - I. -"-; -_,,... • .�. V r' C. • F i' ; _ • . I . M • r I ! •,-- • Cr1•rry Nil! Village�. I "•ca.". C) r tS ••••i I , ��• a.a,...y `—.. e_* . 4s( • S.neat ••Cla1 •• 1 M •4 orL-�-- Quincy ri.ndtld Wnl•t Plpilu,a .• , Wear ce*r•Arwr . . Proposed Prairie Waters ProIject I. 11Q w: is cjr, :nJ /' apahoe Coun.,ro- AURORA WAl11t Figure 2 PI,IIIC I Prulccl Habitats ...nth Potential to P•wkI CPC"Ct•cren:. Zaps •.• Pp•1. •Amps. . Suppon Federally END t xrl,t:t: C::u IY InPrOr if.Dog C'Not p Pwnc SbSon Listed Species 1847 C&ybon shoat t�rw•t.CO 80�!g IND Inv Engle weds( goon Q Nair ifatb t•r P'a uo'tt1 rndiR sot Ecgd.Craws,-a'Soon --C twnll.8rv,dttrl t i o-i t tie I '88 0 yd.•Hold fog* Napo AO:GI P4nF+ 0000 2901 N he�q� �'1�I A411rr,(f a C,lit rot iane,tw !icy Yil,,i` Fab 1599 h;urr 7 Ttf wit J I 7 4 m Ned Rifle .-27 _ - .. 1' v i. ,r S` r !Tjt ;' -EP t. 7 CI,` �� - :4..t, _ 3a - ..i_.. r�R J, 1 ; - : Ft l a I '4_i 7 4� p--' . nf= • ' r t « -i- n 1�a— _ 1- - _.-._ ._ I. ._ - 1.�.s. t. .11=a[ �rre --_�- • •- - _ ` 7 r _ • . . -'-- -t .,Z __- _______ I_ « r - - ar , i. -- , . • 1 i• • Wr _i -yin. Ii • r , iiiii tr t iiiti MIS t.ii;IF rr. �• • pit bi. wit: , - 4,.,.... eil 4 ,- 5. ) ,. . T Ift\ '1f • , « - S^ •4 .ri .. , . I 14 ,41 • Illhp a -? 1 . -e: S- ,i ll' _ • . . _ _ -'---_ •'{. _k "i 141E _ �- 44.1.'ilk; i Mt_- �•tf . 1�,•� 76140 I r 1 74 f r t :f,:I �i :7; 5 i _ • j - - ._ _ . _ _ • _ 1.• ' ��• ft ' F1\�'�/ Proposed Prairie Waters Project AURORA WATER Figure 2b �( Weld, Adams and .4tn►O1 of Ccun'un P I alas w.,.i, 'soft.: Habitats with Potential to J Ca.rw Ca i d tfo.,h cnlnua fRi3i3 is .,•:4--,r; n i..lda•w... 6yiR0 Support Federally Listed 1842 IJi,4rne •irwt — i,"Dufat NALF� Species in the Vicinity of the North Campus D.nw, CO 80219 hams tMg Latv., ;e ► 31 830 1188 O RAW wensloov AlroatMacaw - 2004 N bred It (sty AAirx:U1E!re;ilF Ie. 13031830 .199 ;A;, *owl, kid foa•NayMar ft6 2549 fy:.ye;:b i7.(pit a 5011000 2000 ' A kill 2006 itba lt .y lc-a �'=K I A ; - , I. IL - - . 2004 - ifr t` t3 ` ot • • .1)::.i---,. 2004 2003 t .• • • - 1 - . r tip., :;.: • rl y. 1 A 3 * ®1090 •_ I •••I - -_ -. . - - - _ 2003 .. , •I ' l jt ' ` t t. - �.- r • 1: < ! • • k - • I. t• 1 .t�� i. a �. .- _l, . . ( i - — - — — I ' r.Y ={ _- s f '� ` _ __• • ., 1r - - - 7,- •-•,.. . - 7001 S r 3 _ { Y r s t • !. '� � 1 r .t _ I i c MD 14 • milt: :_-- - - _4.4' .. . ( . 4 in gag _ - +� . ._ _ _ , .,.i, . . f. � �_ .. I , -«, , it.... _.l + .-•, --• . J r i 1 l' ` ..♦. .lit tialit •J t `' . ' 109? I I - I i+ s - r- • w ' IR r . h • V1._ - _ -- -- ` 1997 ' - mI. il '•x ?' f a . . 1 tt l i. ' • k e i. C?• jj 1' • r. --1 . - 1 _ • • S•.. i • . f ice.{ . l• • r � Proposed Prairie Waters Project AURORA WATER Figure 3 ERC„) Weid, Dams Of ti A:opuhor Counties Pnn,• Wild'. r:..t•ti Prebic'3 Meadow Jumping FRO t l e.L napE) Propr.•n Renewed by ERO Amble's Hab$ot Evaivatia+ and hopping lototiorn Mouse Survey Locations in the — - Proposed�'p•Lns E.ah:eyd Nni Te Vicinity of the North Campus R12 Clodson Y••d app•- P Dens. CO HO?;, 300 fool Dille of FL•odplo•r e Treppod • NV Fw-d Q n �, o' o ap- h•f.11�1 fu (At, >>4'i�i, 411 ,I.. �fl :QJ 410 118E t0 .>««m Fh xf a 4:'., F ih); = A IS, 1594 Fixna 3 NM?. pal For •3734830 tiR•: f1 'i:1 _- . M*I(P 100f, ATTACHMENT 1: U.S. FISH ANI)WILDLIFE SERVICE COMMENTS DATED MAY 19, 2005 r,,.. United States Department of the Interior "' ?�• FISH AND WILDLIFE SERVICE Ecological Services Colorado Field Office P : .5".26E 755 Parfet Street, Suite 361 Fla: Lakewood,Colorado 80215 Oats: 6 -21 06- initial. IN REPLY REFER TO: ES/CO: SPlatte/Concurrence Mail Stop 65412 JUN 2 2 2005 Mr. Tom Jacobs Manager of Capital Projects Division City of Aurora 15151 E. Alameda Parkway. Suite 3600 Aurora,Colorado 80012 Dear Mr. Jacobs: The U.S. Fish and Wildlife Service (Service)received your letter dated May 26, 2005, regarding the City of Aurora's proposed South Platte Project. These comments have been prepared under the provisions of the Endangered Species Act of 1973 (ESA),as amended(16 U.S.C. 1531 et. seq.). In your May 26, 2005, letter, you presented three assumptions for addressing ESA compliance related to any potential depletive effects of the subject Project on Federally-listed species in Nebraska. if these assumptions prove to be true,that is, a Platte River Recovery Implementation Program(Program),which covers Aurora's South Platte Project, is in place (established and implemented the City has demonstrated that there is no federal nexus with the Project;then, the Service would concur that implementation of the Program would provide the necessary ESA compliance for the potential depletive effects of the Project to listed species in Nebraska. As you described under Assumption#3,potential impacts from the Project to any Federally- listed species in Colorado will need to be addressed separately with the Service in accordance with the ESA. If the Service can be of further assistance,please contact Sandy Vana-Miller of my staff at (303) 275-2370. Sincerely, Susan C.Linner Colorado Field Supervisor cc: FWSR6,D. Anderson, M. Butler FWSR6/ES/GI, S. Anschutz, M. Tacha FWSR6/ES, S. Vana-Miller Following is a description of the water to be used by the Prairie Waters Project. The Project is designed initially to deliver 10,000 acre feet of water in 2010. Table 1, provided in the attachment, provides a summary of the Reusable Water Rights that will supply the Project. The water supply for the Project is derived from Aurora's core water rights portfolio. Most of the water owned by the City is legally reusable. Aurora Water plans to re-divert legally reusable water, through alluvial wells along the South Platte River in southern Weld County, to supply the Project. As a general rule in Colorado, appropriators are allowed one use of water and the water left over after that use goes downstream to the next user. The exception to this rule is legally reusable water. This supply is water from trans-basin sources (Aurora's Colorado River and Arkansas River water rights), deep wells (Aurora and East Cherry Creek Valley's Denver basin wells) or previously water court changed rights (Aurora's South Park water rights). Right to re-use is 37-82-106; Thornton v. Bijou, 926 P2d. 1, 65 (1996) Water Supply & Storage Co. v. Curtis, 733 P.2d 680, 682-83 (Colo.1987). The majority of Aurora's water supply fits one of the three categories of reusable water. Most of Aurora's water supply is imported water. The average amount imported from the Colorado and Arkansas basins is approximately 18,000 acre-feet (32%) and 16,000 acre-feet (28%), respectively. South Platte basin sources provide the rest of the water supply of 23,000 acre-feet (40%). The water from the Colorado and Arkansas basins is pumped into the South Platte Basin via the Otero Pumping Station, a component of the Homestake Project. The South Platte reusable sources arise mainly from Park County changed water rights. Aurora Water also owns reusable returns from deep non-tributary wells operated by East Cherry Creek Valley Water and Sanitation District. See Exhibit B attached. After its first use, a portion of the reusable water returns to the river system through reclamation plant discharges or irrigation return flows. Aurora Water's reusable return flows re-enter the natural stream system at the Denver Metro Wastewater Reclamation Plant, the Sand Creek Wastewater Reclamation Plant and, in the case of lawn irrigation, at various points in the service area drainage system. The average annual reusable supply available for the Prairie Waters Project in 2010 is 13,200 acre feet. Colorado water law does not currently require water court approval to re-divert legally reusable water if the water is withdrawn through a ditch diverting from a stream. The state engineer set this policy based on 37-82-106 and the case law interpreting this provision, primarily Thornton v. Bijou, 926 P2d. 1, 62-77 (1996). In order to provide additional water treatment, Aurora Water does not plan to divert its yield through ditches and instead plans to divert the water through tributary wells constructed close to the South Platte River. Tributary wells affect stream flow on a delayed basis and as a result Colorado water law requires all tributary wells in over-appropriated basins (the South Platte Basin is over- appropriated) to obtain water court approved plans for augmentation. On requiring an augmentation plan: Southeastern Colorado Water Conservancy Dist. v. City of Florence, 688 P.2d 715(Colo. 1984). Aurora Water filed its application seeking approval of a plan for augmentation for the Prairie Waters Project on May 31, 2006, Case No. 06CW104, Water Division 2. During the time the augmentation plan is pending before the water court, Aurora Water may operate its Prairie Waters Project wells pursuant to a substitute water supply plan approved by the State Engineer 37-92-308(4)C.R.S. (2005). The water court will approve a plan for augmentation if Aurora Water demonstrates that the time, location and amount of the well depletions equal the reusable water sources Aurora Water has available at the same location on the stream 37-92-305(8) C.R.S. (2005). There are no water supply development alternatives that are more cost-effective or timely than reusing the already-decreed renewable sources of supply owned by Aurora Water. Aurora Water is very interest in keeping the USR process moving smoothly, and in particular, initiating the referral process with outside agencies. Hopefully the attached information meets your needs. However, should you require anything further, do not hesitate to call me at 303-739-7317. Mark Pifher Deputy Director, Water Resources Table 1: Estimate of Average Annual Reusable Supplies Available for Aurora's Prairie Waters Project . Item Volume Jacre-feet) 2015 1. Aurora's Annual Demand 59,500 64,700 2. Aurora's municipal indoor^ de ma cl 33.500 36,400 3. Aurora's municipal outdoor 26,000 28,300 ilernarxl_ _ 4. Aurora's reusable effluent 30,000 32.000 • 5. East Cherry Creek Effluent 4,200 4,200 fi -.m Volume of reusable lawn 5,800 6,400 irrigation return flows 7. Aurora's Total Reusable Return Flows prior to 40.000 43,200 comniitmer.tts 8 Aurora's existing reusable effluent commitments (20,800) (20,SU0) e 9 I Reusable effluent available after commitments ___.__ 13,200 22,7{10 z oP q, in �y� N Hy � Qr o n N N N N N N N N N IR V� w N V u N � v c4i `v `�i u v v u u v oo 'et (,� � OMO NN VI ^-: 00 G La a _:l$ ••d: c::: V g. .51 -,..1 V �nei N 1-1, V 00 ,C � 2 Z 3 V vii Z MMr) MMM C�'fMMMM c+1MM MM •w �. 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CL < Q ¢ a) 0 '0' 7 CI U 0 ❑ L.17 > L `mE 0 Ca o ca- o c - ' Q ua > O RI a >, v• •V "0 a2 O H ti C e • O •;b 0 ,0 10 rn v S y 5 - C Ner, � a < g3 2 cN O O a) p C 3 O 0 C 0 CA bi) ti ai >, Z 0 7 � 0 4o Z w 0 O y 0 0� n OA 0 0 5 O"0 el 0 = W `J Y O •y O z Q o o y 0 w v m d `oU� QQQQ a) a ro .°2 aX) a waawm „ o < 3 1 ;, _ oa oxt 0 • N1 N ¢ M fry M (y�1 0 C/] a) [n Q O 00 .a 07 QQ F Z Z Z O ^, a) O �\ Z ..z "..0 The File contains Four Final Reports for Modified Phase I - Environmental Site Assessments for the following : Robbins Property Leon Property Rosenbrock Property RML Property Please see originals in File Consultants in natural resources and the environment FINAL REPORT MODIFIED PHASE I ENVIRONMENTAL SITE ASSESSMENT ROBBINS PROPERTY 2876 WELD COUNTY ROAD 23 WELD COUNTY, COLORADO Prepared for MWH Americas, Mc. 380 Interlocken Crescent, Suite 150 Broomfield, CO 80021 Prepared by ERO Resources Corporation 1842 Clarkson Street Denver, Colorado 80218 (303) 830-1188 December 22, 2005 ERG, ERO Resources Corp. 1842 Clarkson Street Denver, CO 80218 (303( 830- 1188 Fox: 1301830-1199 Denver • Boise wwa eroresources tom. ero`.eroeso�zes-cone ERO Resources Corporation • CONTENTS Summary Introduction 1 Purpose Methods 3 Site Description 3 Location and Legal Description 3 Site and Vicinity Characteristics 3 Current and Past Uses of Property and Adjoining Properties 5 Records Review 7 Publicly Available Environmental Records 7 Local Records 9 Site Reconnaissance 10 Findings, Opinion, and Conclusions 12 Findings 12 Data Gap Summary 13 Opinion 14 Conclusions 15 References 16 S TABLES Table 1. Summary of publicly available environmental records. 7 Table 2. COGCC records summary for property wells. 10 Table 3. Recognized Environmental Conditions 15 FIGURES Figure 1. Property Location 2 Figure 2. Site Plan 4 APPENDICES Appendix A— Site Photographs Appendix B Environmental Records Appendix C Qualifications of Environmental Professionals Appendix D Disclaimer • ERO Resources Corporation • Summary MWH Americas, Inc. retained ERO Resources Corporation (ERO) to conduct a Modified Phase I Environmental Site Assessment (M-ESA) for the Robbins property, located at 2876 Weld County Road 23, generally southeast of County Road 23 and County Road 8, in Weld County, Colorado (hereafter called "the property"). ERO performed this M-ESA according to the "Standard Practice for Environmental Site Assessments: Phase I Environmental Site Assessment Process" (American Society for Testing Materials E 1527-00, 2000), except property owners were not interviewed as part of this M-ESA. The M-ESA consisted of a review of historical information, and federal, state, and local records; interviews with local government officials; and a site reconnaissance. The property consists of one parcel of agricultural land totaling about 68.6 acres. Historically the property and surrounding area have been used for agricultural, residential, and oil and gas production purposes. Federal, state, and local records indicate two plugged and abandoned oil and gas wells (Isom, Robert M. Unit #1 and Robert M. Isom Unit B#1) and one active oil and gas well (Robbins #4-24) on the property. During the site reconnaissance, ERO inspected the property by walking the perimeter and traversing the interior. The majority of the property consists of cultivated agricultural fields with a residence, two grain silos, one unattached garage, and one barn. The residence was not accessed during the site reconnaissance. Numerous containers of household, lawn, and automotive chemicals in residential consumer quantities, were • observed in the unattached garage on the property. Oil and fuel staining was observed on the concrete floor of the barn and an area of oil staining was observed in the driveway outside the barn. One 250-gallon aboveground gasoline storage tank (AST) and two 55- gallon drums, one containing an oily liquid and one empty, were observed adjacent to the barn. A buried solid waste disposal area containing two empty 55-gallon drums was observed south of the residence, and one active oil and gas well (Robbins #4-24) was observed in center of the property. ERO performed a Phase I Environmental Site Assessment in conformance with the scope and limitations of ASTM Practice E 1527, except property owners were not interviewed as part of this M-ESA. Any exceptions to, or deletions from, this practice are described in the Introduction section of this report. This assessment revealed no evidence of recognized environmental conditions in connection with the property, except for the two abandoned and one active oil and gas wells, the residential garage with numerous individual size containers of household and automotive chemicals, the barn with oil and fuel staining on the concrete floor, the aboveground gasoline storage tank with two drums stored adjacent to the tank, and an area of buried solid waste disposal containing two empty 55-gallon drums. For this reason, ERO recommends a limited subsurface investigation to assess the soil and ground water quality in the vicinity of the current and former oil and gas wells, solid waste disposal site, the garage with chemical storage, the gasoline AST and the two stored drums, and adjacent to the barn with fuel and oil staining observed within. In addition, the COGCC does not have any regulations restricting the surface • development over plugged and abandoned well; however, COGCC and ERO do not fRO 1 Resources Corporation • recommend situating structures over the former well locations. Should the well casing for the wells be encountered during site development activities, the well casing should be cut off and the well abandoned according to COGCC requirements. COGCC records do not indicate the location of product flow lines from the wells and regulations do not require the lines to be removed as part of the abandonment procedure. For this reason, disconnected product flow lines as well as minor, undetectable leaks in active product flowlines may have been present on or adjacent to the property and adjoining parcels and may have associated petroleum impacted soils able to be assessed without line excavation. In accordance with the ASTM standard, the findings and conclusions of this ESA are valid for 180 days from the date of this report. In accordance with the ASTM standard, the findings and conclusions of this ESA are valid for 180 days from the date of this report. • • ERO ii Resources Corporation Consultants in natural resources and the environment FINAL REPORT MODIFIED PHASE I ENVIRONMENTAL SITE ASSESSMENT LEON PROPERTY NORTHEAST OF COUNTY ROAD 23 AND COUNTY ROAD 8 WELD COUNTY, COLORADO Prepared for MWH Americas, Inc. 380 Interlocken Crescent, Suite 150 Broomfield, CO 80021 Prepared by— ERO Resources Corporation 1842 Clarkson Street Denver, Colorado 80218 (303) 830-1188 December 22, 2005 ERO ERO Resources Corp. 1842 Clarkson Street Denver, CO 80218 (303) 830-1188 Fax: (303)830-1199 Denver • Boise www eroresources-corn ERU ero.d eroresourcesmm Resources Corporation CONTENTS Summary Introduction 1 Purpose 1 Methods 3 Site Description 3 Location and Legal Description 3 Site and Vicinity Characteristics 3 Current and Past Uses of Property and Adjoining Properties 5 Records Review 6 Publicly Available Environmental Records 6 Local Records 8 Site Reconnaissance 10 Findings, Opinion, and Conclusions 12 Findings 12 Data Gap Summary 12 Opinion 13 Conclusions 14 References 16 • TABLES Table 1. Summary of publicly available environmental records. 7 Table 2. COGCC records summary for property wells. 9 Table 3. Recognized Environmental Conditions 14 FIGURES Figure 1. Property Location 2 Figure 2. Site Plan 4 APPENDICES Appendix A—Site Photographs Appendix B —Environmental Records Appendix C Qualifications of Environmental Professionals Appendix D Disclaimer • ERO Resources Corporation • Summary MWH Americas, Inc. retained ERO Resources Corporation (ERO) to conduct a Modified Phase I Environmental Site Assessment(M-ESA) for the Leon property, located on the northeast corner of County Road 8 and County Road 23 in Weld County, Colorado (hereafter called "the property"). ERO performed this M-ESA according to the "Standard Practice for Environmental Site Assessments: Phase I Environmental Site Assessment Process" (American Society for Testing Materials E 1527-00, 2000), except property owners were not interviewed as part of this M-ESA. The M-ESA consisted of a review of historical information, and federal, state, and local records; interviews with local government officials; and a site reconnaissance. The property consists of about 80 acres of agricultural land. Historically the property and surrounding area have been used for agricultural, residential, and oil and gas production purposes. Federal, state, and local records indicate three oil and gas wells, the Kiefer George W. Unit B 2A, George Kiefer B-4, and Kiefer Pooling Unit 1, are located on the property. A leak of approximately 60 to 70 barrels of oil condensate from an underground consolidation line associated with the Kiefer George W. Unit B 2A well was reported to the Colorado Oil and Gas Conservation Commission (COGCC) in August 1996. Historical aerial photographs show the approximate location of the impacted areas across the width of the property in the eastern portion of the cultivated fields. During the site reconnaissance, ERO inspected the property by walking the perimeter • and traversing the interior. ERO observed a mobile home, solid waste disposal, three oil and gas wells, and one oil and gas tank battery on the property. Within the area of solid waste disposal in the central portion of the property, ERO observed numerous empty tanks, empty 55-gallon drums, one 250-gallon aboveground diesel storage tank (AST), areas of stained soil beneath the tank and associated with miscellaneous 1-gallon containers of various petroleum products, and oil and gas production equipment piping, signage, and valves. ERO performed a Phase I Environmental Site Assessment in conformance with the scope and limitations of ASTM Practice E 1527, except property owners were not interviewed and the private mobile home residence was not inspected as part of this M- ESA. Any exceptions to, or deletions from, this practice are described in the Introduction section of this report. This assessment revealed no evidence of recognized environmental conditions in connection with the property except for: • Three active oil and gas wells (Kiefer George W. Unit B 2A, George Kiefer B-4, and Kiefer Pooling Unit 1) • A spill associated with the Kiefer George W. Unit B 2A consolidation line • One oil and gas tank battery • A solid waste disposal sites containing steel storage tanks of various sizes • One 250-gallon AST and miscellaneous containers of petroleum product • ERO t Resources Corporation For these reasons, ERO recommends a subsurface investigation to assess the soil and ground water for petroleum hydrocarbons and volatile organic compounds in the vicinity of the oil and gas wells, the oil and gas tank battery, solid waste disposal site, and the reported spill associated with the Kiefer George W. Unit B 2A oil and gas well collection line. In addition, ERO recommends interviewing the current property owner and tenants to identify any incidences on the property that may indicate suspect environmental conditions associated with the property. COGCC records do not indicate the location of product flow lines from the wells and regulations do not require the lines to be removed as part of the abandonment procedure. For this reason, disconnected product flow lines as well as minor, undetectable leaks in active product flowlines may be present on or adjacent to the property and adjoining parcels and may have associated petroleum impacted soils unable to be assessed without line excavation. In accordance with the ASTM standard, the findings and conclusions of this ESA are valid for 180 days from the date of this report. 0 • ERO li Resources Corporation Consultants in natural resources and the environment FINAL REPORT MODIFIED PHASE I ENVIRONMENTAL SITE ASSESSMENT ROSENBROCK PROPERTY 1/4 MILE NORTHEAST OF COUNTY ROAD 23 AND COUNTY ROAD 8 WELD COUNTY, COLORADO Prepared for MWH Americas, Inc. 380 Interlocken Crescent, Suite 150 Broomfield, CO 80021 Prepared by ERO Resources Corporation 1842 Clarkson Street Denver, Colorado 80218 (303) 830-1188 December 22, 2005 ERO ERO Resources Corp. 1842 Clarkson Street Denver, CO 80218 (303) 830-1188 Fax:(303)830-1199 Denver • Boise www.eroresources com MO e-or d,eroresources.com Resources Corporation • CONTENTS Summary Introduction 1 Purpose 1 Methods 3 Site Description 3 Location and Legal Description 3 Site and Vicinity Characteristics 3 Current and Past Uses of Property and Adjoining Properties 5 Records Review 6 Publicly Available Environmental Records 6 Local Records 8 Site Reconnaissance 10 Findings, Opinion, and Conclusions 12 Findings 12 Data Gap Summary 13 Opinion 14 Conclusions 15 References 16 S TABLES Table 1. Summary of publicly available environmental records. 6 Table 2. COGCC records summary for property wells. 9 Table 3. Recognized environmental conditions 14 FIGURES Figure 1. Property Location 2 Figure 2. Site Plan 4 APPENDICES Appendix A Site Photographs Appendix B— Environmental Records Appendix C Qualifications of Environmental Professionals Appendix D—Disclaimer • ERO Resources Corporation • Summary MWH Americas, Inc. retained ERO Resources Corporation (ERO)to conduct a Modified Phase I Environmental Site Assessment (M-ESA) for the Rosenbrock property located % mile north of County Road 8 and County Road 23 in Weld County, Colorado (hereafter called "the property"). ERO performed this M-ESA according to the "Standard Practice for Environmental Site Assessments: Phase I Environmental Site Assessment Process" (American Society for Testing Materials E 1527-00, 2000), except property owners were not interviewed as part of this M-ESA. The M-ESA consisted of a review of historical information, and federal, state, and local records; interviews with local government officials; and a site reconnaissance. The property consists of about 80 acres of agricultural land. Historically,the property and surrounding area have been used for agricultural, residential, and oil and gas production purposes. Federal, state, and local records indicate one plugged and abandoned oil and gas well (Rosenbrock #1) and one active oil and gas well (Donald Rosenbrock #2A) are located on the property. Aerial photographs from 2000 show a possible production pit or frac tank immediately north of the Donald Rosenbrock #2A well. During the site reconnaissance, ERO inspected the property by walking the perimeter and traversing the interior. ERO observed one active oil and gas well (Donald Rosenbrock #2A) and numerous containers of various sizes containing petroleum products or paint within the barn, minor soil and concrete staining on the floor of the • barn, and two areas of solid waste disposal containing empty 55-gallon drums were observed south and west of the barn. No surface indication of the abandoned oil and gas well (Rosenbrock #1) was observed on the property because of its location in a cultivated cornfield. Because of restrictions against contacting property owners, ERO was not able to interview current property owners. ERO performed a Phase I Environmental Site Assessment in conformance with the scope and limitations of ASTM Practice E 1527, except property owners were not interviewed as part of this M-ESA. Any exceptions to, or deletions from,this practice are described in the Introduction section of this report. This assessment revealed no evidence of recognized environmental conditions in connection with the property, except for the two oil and gas wells (Rosenbrock #1 and Donald Rosenbrock #2A), numerous containers containing petroleum products and paint used and stored within the barn on the property, and the two areas of unpermitted solid waste disposal containing empty 55- gallon drums located to the south and west of the barn. For this reason, ERO recommends a subsurface investigation to assess the soil and ground water quality in the vicinity of the oil and gas wells, the area to the south and west of the barn and historical use and storage of petroleum product in the barn. In addition, because of the lack of property owner or tenant information regarding the history of the property, ERO recommends interviewing the current property owners for historical information regarding the property use. In accordance with the ASTM standard,the findings and conclusions of this M-ESA are valid for 180 days from the date of this report. • ERO j Resources Corporation Consultants in natural resources and the environment MODIFIED PHASE I ENVIRONMENTAL SITE ASSESSMENT RML PROPERTY 11717 WELD COUNTY ROAD 8 WELD COUNTY, COLORADO Prepared for MWH Americas, Inc. Aurora Program Office 14707 East 2"d Avenue, Suite 150 Aurora, Colorado 80011 Prepared by ERO Resources Corporation 1842 Clarkson Street Denver, Colorado 80218 (303) 830-1188 November 30, 2005 ERO ERO Resources Corp. 1842 Clarkson Street Denver, CO 80218 (303) 830-1188 Fox: )303)830-1199 Denver • Boise www.eroresources.corn ERO ero(p eroresources.corn Resources Corporation • CONTENTS Summary i Introduction I Purpose I Methods 3 Site Description 3 Location and Legal Description 3 Site and Vicinity Characteristics 3 Current and Past Uses of Property and Adjoining Properties 5 Records Review 6 Publicly Available Environmental Records 6 Local Records 8 Site Reconnaissance 10 Findings, Opinion, and Conclusions 12 Findings 12 Data Gap Summary 13 Opinion 14 Conclusions 15 References 16 0 TABLES Table I. Summary of publicly available environmental records. 6 Table 2. COGCC records summary for property wells. 9 Table 3. Recognized environmental conditions 14 FIGURES Figure 1. Property Location 2 Figure 2. Site Plan 4 APPENDICES Appendix A Site Photographs Appendix B—Environmental Records Appendix C—Qualifications of Environmental Professionals Appendix D Disclaimer • ER0 Resources Corporation • Summary MWH Americas, Inc. retained ERO Resources Corporation (ERO)to conduct a Modified Phase I Environmental Site Assessment (M-ESA) for the Rosenbrock property located ''A mile north of County Road 8 and County Road 23 in Weld County, Colorado (hereafter called "the property"). ERO performed this M-ESA according to the "Standard Practice for Environmental Site Assessments: Phase I Environmental Site Assessment Process" (American Society for Testing Materials E 1527-00, 2000), except property owners were not interviewed as part of this M-ESA. The M-ESA consisted of a review of historical information, and federal, state, and local records; interviews with local government officials; and a site reconnaissance. The property consists of about 80 acres of agricultural land. Historically, the property and surrounding area have been used for agricultural, residential, and oil and gas production purposes. Federal, state, and local records indicate one plugged and abandoned oil and gas well (Rosenbrock#1) and one active oil and gas well (Donald Rosenbrock #2A) are located on the property. Aerial photographs from 2000 show a possible production pit or frac tank immediately north of the Donald Rosenbrock #2A well. During the site reconnaissance, ERO inspected the property by walking the perimeter and traversing the interior. ERO observed one active oil and gas well (Donald Rosenbrock#2A) and numerous containers of various sizes containing petroleum products or paint within the barn, minor soil and concrete staining on the floor of the • barn, and two areas of solid waste disposal containing empty 55-gallon drums were observed south and west of the barn. No surface indication of the abandoned oil and gas well (Rosenbrock #1)was observed on the property because of its location in a cultivated cornfield. Because of restrictions against contacting property owners, ERO was not able to interview current property owners. ERO performed a Phase I Environmental Site Assessment in conformance with the scope and limitations of ASTM Practice E 1527, except property owners were not interviewed as part of this M-ESA. Any exceptions to, or deletions from,this practice are described in the Introduction section of this report. This assessment revealed no evidence of recognized environmental conditions in connection with the property, except for the two oil and gas wells(Rosenbrock #1 and Donald Rosenbrock#2A), numerous containers containing petroleum products and paint used and stored within the barn on the property, and the two areas of unpermitted solid waste disposal containing empty 55- gallon drums located to the south and west of the barn. For this reason, ERO recommends a subsurface investigation to assess the soil and ground water quality in the vicinity of the oil and gas wells, the area to the south and west of the barn and historical use and storage of petroleum product in the barn. In addition, because of the lack of property owner or tenant information regarding the history of the property, ERO recommends interviewing the current property owners for historical information regarding the property use. In accordance with the ASTM standard, the findings and conclusions of this M-ESA are valid for 180 days from the date of this report. • ERO i Resources Corporation File contains three notebooks regarding the Voluntary Clean-up Plan Volume 1 - Report Volume 2 - Appendices Volume 3 - Appendices Please see originals in File CITY OF AURORA PRAIRIE WATERS PROJECT - NORTH CAMPUS AQUIFER RECHARGE AND RECOVERY SITE A VOLUNTARY CLEAN-UP PLAN VOLUME I - REPORT Prepared for: CITY OF AURORA 14707 East 2"d Avenue, Suite 150 Aurora, CO 80011 Prepared by: TETRA TECH,INC. 1900 South Sunset Street, Suite 1-F Longmont, Colorado 80501 In Cooperation With: CH2M Hill 9193 South Jamaica Street Englewood, Colorado 80112 Tetra Tech Job No. 19-4740.007.12 July 2006 el TETRA TECH, INC. • TABLE OF CONTENTS Page 1.0 INTRODUCTION 1-1 1.1 General Information 1-1 1.1.1 Contact Information for Site Owner 1-1 1.1.2 Property Location 1-2 1.1.3 Current Land Use and Types and Sources of Contamination 1-2 1.1.4 Proposed Land Use 1-3 1.2 Program Inclusion 1-3 1.3 Organization of this Document 1-4 2.0 SITE HISTORY 2-1 2.1 RML Property 2-2 2.2 Rosenbrock Property 2-3 2.3 Leon Property 2-4 • 2.4 Robbins Property 2-5 3.0 CLEAN-UP LEVELS 3-1 3.1 Remediation Levels for Contamination Inside the Low Permeability Barrier 3-1 3.2 Remediation Levels for Contamination Outside the Low Permeability Barrier 3-2 4.0 SITE CHARACTERIZATION 4-I 4.1 Regional Geology and Hydrogeology 4-I 4.2 ARR Site A 4-2 4.2.1 RML Phase II ESA Findings 4-2 4.2.2 Rosenbrock Phase II ESA Findings 4-3 4.2.3 Leon Phase II ESA Findings 4-4 4.2.4 Robbins Phase II ESA Findings 4-6 4.2.5 Summary of ARR Site A Areas Exceeding Clean-up Levels 4-8 4.3 Remedial Actions Implemented at ARR Site A 4-9 5.0 MATERIALS MANAGEMENT PLAN 5-1 • 5.1 Identified Wastes, Materials and Source Areas 5-1 PRAIRIE WATERS PROJECT NORTH CAMPUS i July 2006 SITE A VCUP F:A4740_007AVCUP\ReportVVCUP-Site A\Site A Final Report.doc 5.1.1 Demolition Wastes 5-1 • 5.1.2 Individual Sewage Disposal Systems (ISDS) 5-3 5.1.3 Miscellaneous Domestic and Agricultural Related Chemicals 5-3 5.1.4 Private Solid Waste Disposal Areas 5-4 5.1.5 Above Ground Storage Tanks (ASTs) 5-5 5.1.6 Miscellaneous Petroleum Stained Soils 5-5 5.1.7 Groundwater Contamination 5-9 5.1.8 Water Well and Monitoring Well Abandonment 5-10 5.1.9 Oil and Gas Exploration and Production (E&P) Infrastructure 5-10 5.1.10 Electrical Transformers 5-I1 5.2 Contingency Plan 5-12 5.2.1 Notification Protocol 5-12 5.2.2 Sampling and Waste Characterization 5-13 5.2.3 Site Control 5-15 6.0 COMPLETION REPORT 6-1 6.1 Confirmatory Sampling and Analyses 6-1 6.1.1 Soil 6-1 6.1.2 Groundwater 6-2 • 6.2 Reporting 6-3 6.3 Schedule 6-4 7.0 REFERENCES 7-1 List of Tables Table 1 Physical Description of ARR Site A Property Location Table 2 Summary of Publicly Available Environmental Records Reviewed During Phase I ESAs Table 3 Summary of CDPHE Soil Remedial Objectives Table 4 Summary of CDPHE Groundwater Standards Table 5 Summary of COGCC Allowable Concentrations and Levels in Soil and Groundwater Table 6 ARR Site A Phase I ESA Recognized Environmental Conditions Table 7 Summary of ARR Site A Phase II ESA Soil and Groundwater Sample Analyses Table 8 Summary of ARR Site A Phase II ESA Soil and Groundwater Sample Results • Table 9 Location and Estimated Volume of Petroleum Impacted Soils on ARR Site A PRAIRIE WATERS PROJECT NORTH CAMPUS ii July 2006 SITE A VCUP F:\4740 007\VCUP\Report\VCUP-Site A\Site A Final Report.doc • List of Figures Figure 1 ARR Site A and B Vicinity Map Figure 2 ARR Site A—Future Development Features Figure 3 Generalized Geologic Map and Cross Sections South Platte River Alluvial Aquifer Figure 4 Regional Alluvial Potentiometric Surface Map Figure 5 SEO Water Well and COGCC Gas/Oil Well Location Map ARR Site A List of Sheets Sheet No. 1 Demolition and Environmental Plan, ARR — Site A Sheet No. 2 Demolition and Environmental Plan, ARR— Site A NW Sheet No. 3 Demolition and Environmental Plan, ARR— Site A NE Sheet No. 4 Demolition and Environmental Plan, ARR— Site A SE Sheet No. 5 Demolition and Environmental Plan, ARR—Site A SW Sheet No. 6 Demolition and Environmental Plan, ARR— Site A South • List of Appendices Appendix A ARR Site A Phase I and II Environmental Site Assessment Reports A.1 RML Property A.2 Rosenbrock Property A.3 Leon Property A.4 Robbins Property Appendix B Report on Soil Excavation on the RML Property (ARR Site A) • PRAIRIE WATERS PROJECT NORTH CAMPUS iii July 2006 SITE A VCUP F:A4740_007\VCUP\Report\VCUP-Site A\Site A Final Report.doc CITY OF AURORA PRAIRIE WATERS PROJECT - NORTH CAMPUS AQUIFER RECHARGE AND RECOVERY SITE A VOLUNTARY CLEAN-UP PLAN VOLUME II - APPENDICES Prepared for: CITY OF AURORA 14707 East 2nd Avenue, Suite 150 Aurora, CO 80011 Prepared by: TETRA TECH,INC. 1900 South Sunset Street, Suite 1-F Longmont, Colorado 80501 In Cooperation With: CH2M Hill 9193 South Jamaica Street Englewood, Colorado 80112 Tetra Tech Job No. 19-4740.007.12 July 2006 IDTETRA TECH,INC. CITY OF AURORA PRAIRIE WATERS PROJECT - NORTH CAMPUS AQUIFER RECHARGE AND RECOVERY SITE A VOLUNTARY CLEAN-UP PLAN VOLUME III - APPENDICES Prepared for: CITY OF AURORA 14707 East 2❑d Avenue, Suite 150 Aurora, CO 80011 Prepared by: TETRA TECH,INC. 1900 South Sunset Street, Suite 1-F Longmont, Colorado 80501 In Cooperation With: CH2M Hill 9193 South Jamaica Street Englewood, Colorado 80112 Tetra Tech Job No. 19-4740.007.12 July 2006 lb TETRA TECH,INC. The File contains Drainage Report - North Campus Prairie Waters Project AAR Site A Please see original in File DRAINAGE REPORT NORTH CAMPUS PRAIRIE WATERS PROJECT ARR SITE A WELD COUNTY, COLORADO Prepared for: WELD COUNTY Client: CITY OF AURORA-CAPITAL PROJECTS DIVISION 14707 East 2n°Avenue, Suite 150 Aurora, Colorado 80011 (303) 326-6550 Prepared by: TETRA TECH RMC 1900 S. Sunset Street, Suite 1-F Longmont, Colorado 80501 Tetra Tech RMC Job No. 19-0476.039.13 August 2006 60% Design Submittal tit) TETRA TECH RMC EMIIt) TETRATECH RMC August 31, 2006 Mr. David Bauer, P.E. Weld County— Public Works 1111 H Street Greeley, CO 80632 Re: Drainage Report for North Campus Prairie Waters Project—ARR Site A Weld County, Colorado 60% Design Submittal Tetra Tech RMC Job No. 19-0476.039.13 Dear Mr. Bauer: Tetra Tech RMC is submitting this Drainage Report for ARR Site A of the North Campus Prairie Waters Project. This report provides information regarding existing and proposed drainage patterns, as well as temporary and permanent water quality measures. This drainage report corresponds to the 60% design submittal construction plans. Additional design information must be developed before the construction plans are approved. Such information includes more detailed design for the on-site swales and access road drainage crossings. More details about construction phasing and temporary stormwater drainage controls must also be provided. If there are any questions or comments, or if you would like additional information concerning this report, please feel free to contact us. Sincerely, TETRA TECH RMC, INC. 4k7„,,, Rebecca Norton, P.E. Jul' Vlier, P.E. Project Engineer Project Manager Attachment F:\0476 039\0476.039.01\Permitting\Weld County\USR for Major FAcilities of Public Utility\Drainage Renort\60% Design Submittal\Report Text\Drainage Report-60%.doc 1900 S.Sunset Street,Suite 1-F Longmont,CO 80501 Tel:303.772.5282 Fax:303.665.6959 www.ttrmc.com ENGINEER'S CERTIFICATION I hereby certify that the design for this "Drainage Report for North Campus Prairie Waters Project -ARR Site A (60%Design Submittal)" was prepared under by me or under my direct supervision in accordance with the Urban Storm Drainage Criteria Manual Volumes 1, 2 and 3 and the Weld County Code for the owners thereof. a 00 ON V 18.11o. Itk d 40293 z Rebecca E. Nort , Jgppo Registered Professional Engineer State of Colorado No. 40293 F:\0476_039\0476.039.01\Permitting\Weld CountyWSR for Major FAcilities of Public Utility\Drainage Renort\60% Desien Submittal\Renort Text\Dminage Report-60%.dac 1900 S.Sunset Street,Suite 1-F Longmont,Co 80501 Tel:301772.5282 Fax:303.665.6959 www.ttrmc.com TABLE OF CONTENTS Page 1.0 INTRODUCTION 1 2.0 INTENT 1 3.0 DESIGN CRITERIA 1 4.0 EXISTING DRAINAGE CHARACTERISTICS 1 4.1 Existing Site Description 1 4.2 Hydrologic Analysis 2 5.0 PROPOSED DRAINAGE CHARACTERISTICS 3 5.1 Proposed Site Description 3 5.2 Hydrologic Analysis 3 5.3 Hydraulic Analysis 5 6.0 WATER QUALITY 5 6.1 Temporary/Construction Erosion Control Measures 5 6.2 Long-Term Water Quality BMPs 6 7.0 FLOODPLAIN ANALYSIS/FHDP APPLICATION 6 8.0 CONCLUSION 6 - i - List of Tables Table 5.2.1 — Storm Drainage Comparison 4 List of Appendices Appendix A—Vicinity Map A Appendix B — Existing Hydrologic Calculations B Appendix C —Proposed Hydrologic Calculations C List of Drawings Proposed Conditions Drainage Plan Back Pocket - ii - Hello