KUM & GO 300 SUBDIVISION THORNTON, COLORADO

Transcription

1 FINAL UTILITY STUDY KUM & GO 300 SUBDIVISION THORNTON, COLORADO PREPARED FOR: KUM & GO, L.C WESTOWN PARKWAY WEST DES MOINES, IOWA PH: (515) CONTACT: RYAN J. HALDER PREPARED BY: OLSSON ASSOCIATES 4690 TABLE MOUNTAIN DRIVE, SUITE 200 GOLDEN, CO PH: (303) CONTACT: JOSH ERRAMOUSPE, PE AUGUST 25, 2014 OLSSON ASSOCIATES PROJECT NO

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3 FINAL UTILITY STUDY TABLE OF CONTENTS I. GENERAL LOCATION AND DESCRIPTION... 1 A. Location... 1 B. Description of Property... 2 II. BASINS AND PRESSURE ZONES... 2 A. Major Basin Description... 2 III. DESIGN CRITERIA... 3 A. Regulations... 3 B. Development Criteria Reference and Constraints... 3 C. System Design Criteria... 3 IV. CONCLUSIONS... 4 A. Compliance with Standards... 4 V. REFERENCES... 4 APPENDIX A: DEMAND CALCULATIONS APPENDIX B: WATER MODEL OUTPUT APPENDIX C: SEWER MODEL OUTPUT APPENDIX D: CSP UTILITY PLANS Kum & Go 300 Subdivision Thornton, CO Olsson Project # ii

4 FINAL UTILITY STUDY I. GENERAL LOCATION AND DESCRIPTION This Final Utility Study has been prepared for Kum & Go 300 Subdivision (the PROJECT) by Olsson Associates. This study evaluates the PROJECT s planned water & sanitary sewer extensions & connections to the City s system in order to assess impacts to the City s existing utility infrastructure. A. Location The PROJECT encompasses the development of Lots 1-3, Kum & Go Subdivision 300 located within the Southeast 1/4 of Section 21, Township 2 South, Range 68 West of the Sixth Principal Meridian, City of Thornton, County of Adams, State of Colorado. Refer to Figure 1 for project location. The PROJECT is situated at the northeast quadrant of the intersection between W. 88 th Avenue and Pecos Street. W. 88 th Avenue has a ROW width of 100 ft, while the Pecos ROW width is approximately 80 ft adjacent to the site. PROJECT LOCATION Figure 1: Vicinity Map Kum & Go 300 Subdivision 1 Thornton, CO Olsson Project #

5 FINAL UTILITY STUDY Currently, the majority of the existing property is vacant with a small area dedicated as a donation center drop-off. The site is bordered by a manufactured home park on its north, a condominium/apartment complex on its east, commercial development to the south, and an amusement water park on its west side. The property is zoned community retail and allows for a variety of retail uses including high visibility pad uses with or without drive through orientations, free-standing; multi-tenant retail buildings, anchor and junior anchor buildings. B. Description of Property The PROJECT consists of 6.354± acres (combined area of Lots 1-3, exclusive of the additional ROW to be dedicated along Pecos Street). A high point exists near the shared property line between Lots 2 & 3, with gentle slopes towards the northeast & south. Native vegetation currently covers the majority of the existing parcel of land. Phase I of the development will include construction of a convenience store & fueling canopy on Lot 1 during the Spring of Phase II of the development is anticipated to include full build-out of Lots 2 & 3, as depicted on the preliminary utility plans within Appendix A. At the time of this study, the timing of Phase II had not yet been determined. During the construction of Phase I improvements, an 8 sanitary sewer main will be extended from an existing manhole within Osage Street to the north boundary of Lot 1. The convenience store will extend two separate 4 service lines to the new main (one for kitchen waste & one for domestic waste). Upon Phase II development, it is expected that the buildings on Lots 2 & 3 will extend service lines to the main extension installed during Phase I. Refer to the preliminary sanitary sewer plan within Appendix D for proposed Phase I & II improvements. During the construction of Phase I improvements, an 8 water main will be extended from an existing 16 water main within Pecos Street, along the north boundary of Lot 1. The convenience store will extend a 2 service line to a meter placed just south of the new main, and will tap the new main with a 1.5 service. Additionally, the new main will include a tap for a fire hydrant lateral & assembly due south of the north boundary of Lot 1. A fire hydrant lateral will also be tied-into an existing 8 main within 88 th Avenue, and a hydrant will be installed within the north side of the 88 th Avenue ROW, due south of the convenience store. Upon Phase II development, the new 8 main will be extended along the south & east sides of Lot 3, and will tie-into an existing 8 main within the adjacent multifamily project. It is expected that the buildings on Lots 2 & 3 will extend service lines to the main extension installed during Phase II. Refer to the preliminary water plan within Appendix D for proposed Phase I & II improvements. II. BASINS AND PRESSURE ZONES A. Major Basin Description Per the City s 2010 Water and Wastewater Systems Master Plan (the MASTER STUDY), the PROJECT is located within Sewer Basin A and Pressure Zone 4. Conversations with City staff indicated that utility reports for adjacent subdivisions are non-existent. Kum & Go 300 Subdivision 2 Thornton, CO Olsson Project #

6 FINAL UTILITY STUDY According to the MASTER STUDY s future land use map, the PROJECT is located in an area of anticipated commercial development. Furthermore, no immediate improvements are recommended or anticipated for Basin A or Pressure Zone 4. III. DESIGN CRITERIA A. Regulations The design of utility extensions and the subsequent information contained within this study were prepared in accordance with criteria set forth in the City of Thornton s Standards & Specifications for the Design & Construction of Public & Private Improvements, October 2012 (the MANUAL). At this time, requested deviations from the MANUAL s criteria are, neither, necessary nor sought. B. Development Criteria Reference and Constraints According to the MASTER STUDY, the highest elevation and associated lowest observed pressure within Zone 4 are 5526 ft and 40 psi, respectively. Additionally, the lowest elevation and associated highest observed pressure within Zone 4 are 5370 ft and 117 psi, respectively. Zone 4 reservoir s low hydraulic grade line is 5602 ft, while the same reservoir s high hydraulic grade line is 5640 ft. Since the MASTER STUDY identifies future commercial development within the PROJECT area, and did not identify any immediate required improvements to either Zone 4 or Basin A (besides addressing water quality and tank tracking within Zone 4), development of the PROJECT as depicted on the plans located in Appendix D is not anticipated to adversely affect the City s existing utility infrastructure. C. System Design Criteria Water and sewer improvements for the PROJECT were designed according to Sections 200 & 300 within the MANUAL. Water demand and sewer flow estimates were also obtained from the same said Sections within the MANUAL. WaterCAD and SewerCAD software was used to model the proposed utility improvements for the PROJECT. Modeling output indicates that the proposed improvements meet the City s water distribution system design criteria set forth in Section of the MANUAL, except for B.1. Because the PROJECT is situated (vertically) near the lower threshold of Zone 4 elevations, we expected to see higher static system pressures. When no demands are placed on the proposed system, static pressures are in excess of 100 psi. To that end, we do not anticipate any modifications to the existing infrastructure, but recognize the need for PRVs within the PROJECT s planned buildings. Furthermore, modeling output indicates that the proposed improvements meet the City s sanitary sewer design criteria set forth in Section of the MANUAL. Refer to Appendix A for water demand & sewer flow calculations, and Appendices B & C for water model and sewer model output. Kum & Go 300 Subdivision 3 Thornton, CO Olsson Project #

7 FINAL UTILITY STUDY IV. CONCLUSIONS A. Compliance with Standards It is anticipated that construction of Phase I & II improvements described in this study will not adversely impact the City s existing infrastructure. The PROJECT s buildings will not create an inordinate demand on the City s water system, nor will it add significant waste to the City s sanitary sewer system. V. REFERENCES 1) Standards and Specifications for the Design and Construction of Public and Private Improvements, City of Thornton, October ) Volume 1: Water and Wastewater Systems Master Plan for the City of Thornton, The Engineering Company, May Kum & Go 300 Subdivision 4 Thornton, CO Olsson Project #

8 FINAL UTILITY STUDY APPENDIX A: DEMAND CALCULATIONS Kum & Go 300 Subdivision Thornton, CO Olsson Project #

9 KUM & GO 300 SUBDIVISION THORNTON, COLORADO WATER DEMAND CALCULATIONS Bldg Size (SF) (GPD/1000SF) (GPM) Flow (GPM) Lot 1 4,992 V B NO 2, , Lot 2 3,150 V B NO 1, ,000 3, Lot 3 9,035 V B YES 1, , Total 17,177 12, Average Daily Demand: Shopping Center: 680 GPD per 1,000 SF building area Fast Food: 1,000 GPD per 1,000 SF building area Peaking Factors: Max Day Demand: 1.8 Peak Hour Demand: 3.24 Construction Type Sprinklers? Fire Flow (GPM) No. Hydrants Average Day Demand Average Day Demand (GPD) Max Day Demand Max Day Demand + Fire Peak Hour Demand (GPM) Peak Hour Demand (GPM): 28.5 Max Day Demand + Fire Flow (GPM): (max day demand + one hydrant) Design Constraints: 1. Pipe pressure must be between 50 PSI & 100 PSI with no demand on the system. 2. Pipe pressure at peak hour demand must be greater than 40 PSI, max velocity less than 5 ft/s. 3. Pipe pressure at max day demand + fire flow must be greater than 20 PSI, max velocity less than 11.2 ft/s (8" pipe), max velocity less than 10 ft/s (all other pipe diameters).

10 KUM & GO 300 SUBDIVISION THORNTON, COLORADO SEWER FLOW CALCULATIONS Lot Size (Acre) Average Day Flow (GPD/Acre) Lot , Lot Lot , Total , Average Daily Flow: Commercial: 600 GPD/ACRE Average Day Flow (GPD) Peak Hour Flow (GPM): 9.3 Peaking Factor Peak Hour Flow (GPM) Peak Hour Flow (CFS) Design Constraints: 1. Pipe must be designed to carry peak flow at no more than 50% maximum pipe capacity (pipes smaller than 15"). 2. Pipe must be designed to carry peak flow at no more than 80% maximum pipe capacity (pipes 15" & larger). 3. Use Manning n = Minimum main diameter shall be 8". 5. Minimum & maximum slopes for 8" pipes shall be 0.40% and 5.00%, respectively. 6. Minimum & maximum slopes for 4" services shall be 2.00% and 8.00%, respectively.

11 FINAL UTILITY STUDY APPENDIX B: WATER MODEL OUTPUT Kum & Go 300 Subdivision Thornton, CO Olsson Project #

12 R 5285 McWhinney Boulevard Suite 160 Loveland, CO TEL

13 R 5285 McWhinney Boulevard Suite 160 Loveland, CO TEL

14 R 5285 McWhinney Boulevard Suite 160 Loveland, CO TEL

15 R 5285 McWhinney Boulevard Suite 160 Loveland, CO TEL

16 R 5285 McWhinney Boulevard Suite 160 Loveland, CO TEL

17 R 5285 McWhinney Boulevard Suite 160 Loveland, CO TEL

18 R 5285 McWhinney Boulevard Suite 160 Loveland, CO TEL

19 R 5285 McWhinney Boulevard Suite 160 Loveland, CO TEL

20 FINAL UTILITY STUDY APPENDIX C: SEWER MODEL OUTPUT Kum & Go 300 Subdivision Thornton, CO Olsson Project #

21 R 5285 McWhinney Boulevard Suite 160 Loveland, CO TEL

22 R 5285 McWhinney Boulevard Suite 160 Loveland, CO TEL

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24 FINAL UTILITY STUDY APPENDIX D: CSP UTILITY PLANS Kum & Go 300 Subdivision Thornton, CO Olsson Project #

25 PROJECT TEAM: OWNER: RAYMOND W. ELLISON NON-EXEMPT MARITAL TRUST P.O. BOX 1747 VENTURA, CA ATTN: JOSEPH ELLISON PH: DEVELOPER/APPLICANT: KUM & GO L.C WESTOWN PARKWAY WEST DES MOINES, IA ATTN: RYAN HALDER PH: ENGINEER: OLSSON ASSOCIATES 4690 TABLE MOUNTAIN DRIVE, SUITE 200 GOLDEN, CO CONTACT: JOSH ERRAMOUSPE PH: LANDSCAPE ARCHITECT: OLSSON ASSOCIATES 7157 VISTA DRIVE WEST DES MOINES, IA CONTACT: JOSEPH STOBERL PH: GEOTECHNICAL ENGINEER: OLSSON ASSOCIATES 8720 SOUTH 114TH STREET, SUITE 107 LA VISTA, NE CONTACT: ED SCHNACKENBERG PH: SURVEYOR: OLSSON ASSOCIATES 4690 TABLE MOUNTAIN DRIVE, SUITE 200 GOLDEN, CO CONTACT: DANA SPERLING PH: KUM & GO 300 SUBDIVISION PRELIMINARY UTILITY PLAN LEGEND PRELIMINARY NOT FOR CONSTRUCTION 4690 Table Mountain Drive Suite 200 TEL OA # Golden, CO FAX BENCHMARKS: 1. PROJECT BENCHMARK: HORIZONTAL CONTROL WAS ESTABLISHED USING COLORADO NORTH ZONE STATE PLANE (NAD83). PROJECT COORDINATES ARE MODIFIED TO GROUND USING THE PUBLISHED VALUES OF NGS CONTROL POINT "THORNTON 2", USING A SCALE FACTOR OF VERTICAL CONTROL WAS ESTABLISHED USING THE PUBLISHED VALUES OF NGS CONTROL STATION "S 411". EL= (NAVD88) 2. SITE BENCHMARK: A CHISELED "X" IN THE BACK OF THE SIDEWALK IN THE NORTHEAST CORNER OF THE PROPERTY (POINT NO. 103). EL= (NAVD88) CITY OF THORNTON GENERAL UTILITY NOTES: 1. ALL WATERLINES AND SANITARY SEWER LINES SHALL BE CONSTRUCTED PER THE CITY OF THORNTON STANDARDS AND SPECIFICATION FOR THE DESIGN AND CONSTRUCTION OF PUBLIC AND PRIVATE IMPROVEMENTS AND ALL APPLICABLE MASTER PLANS IN EFFECT AT THE TIME OF DEVELOPMENT. LARGER LINES SHALL BE CONSTRUCTED IF NECESSARY TO SERVE THE DEVELOPMENT. LINE SIZES SHALL BE DETERMINED WITH THE FINAL UTILITY REPORT Westown Parkway West Des Moines, Iowa P: F: ALL OFF-SITE EASEMENTS REQUIRED FOR THE CONSTRUCTION OF THE WATER AND SANITARY SEWER SYSTEMS SHALL BE ACQUIRED BY THE DEVELOPER PRIOR TO APPROVAL OF THE SUBDIVISION PLAT. THE RECEPTION NUMBERS FOR THESE EASEMENTS SHALL BE INCLUDED ON THE PLAT. 3. ALL WATERLINES CONSTRUCTED SHALL BE LOOPED; IN ADDITION, THE SYSTEM PRESSURE REDUCING VALVES SHALL BE UTILIZED TO KEEP THE STATIC PRESSURES BELOW 100 PSI. A MINIMUM STATIC PRESSURE OF 40 PSI SHALL BE MAINTAINED FOR THE SITE. 4. COORDINATION IS REQUIRED FOR SERVING WATER AND SANITARY SEWER TO THE ADJACENT PROPERTY OWNERS. STUB-OUTS SHALL BE PROVIDED FOR FUTURE DEVELOPMENT OF THESE PROPERTIES. 5. THE DEVELOPER IS RESPONSIBLE FOR ANY IMPROVEMENTS TO APPLICABLE LIFT STATIONS WHICH ARE NECESSARY TO SERVE THIS DEVELOPMENT. IMPROVEMENTS WILL BE DETERMINED WITH THE FINAL UTILITY REPORT. PROJECT LOCATION 6. A FINAL UTILITY REPORT WILL BE REQUIRED WITH THE DEVELOPMENT OF EACH PLANNING AREA. A SANITARY SEWER BASIN STUDY IS REQUIRED WITH THE REPORT TO EVALUATE THE EXISTING SANITARY SEWER SYSTEM DOWNSTREAM OF THE PROPOSED DEVELOPMENT, AS WELL AS ANTICIPATED DEVELOPMENT UPSTREAM FOR THE SIZING OF THE FACILITIES. ALL NECESSARY IMPROVEMENTS REQUIRED TO SERVE THE DEVELOPMENT ARE THE RESPONSIBILITY OF THE DEVELOPER. 7. THE OWNER AGREES TO PARTICIPATE IN ALL REIMBURSEMENT AGREEMENTS ASSOCIATED WITH THE PROPERTY. 8. ALL METERS SHALL BE SIZED IN ACCORDANCE WITH THE ADOPTED VERSION OF INTERNATIONAL PLUMBING CODE AND ALL ADOPTED APPENDICES IN EFFECT AT THE TIME OF APPROVAL. SHEET INDEX 1 COVER SHEET C0.0 2 PRELIMINARY WATER PLAN C1.1 3 PRELIMINARY SANITARY SEWER PLAN C2.1 NOTE: DATE REVISION DESCRIPTION REVISIONS VICINITY MAP 1" = 600' Know what's THIS PROJECT IS REGISTERED UNDER THE LEED GREEN BUILDING CERTIFICATION PROGRAM. R CALL 811 SEVENTY-TWO HOURS PRIOR TO DIGGING, GRADING OR EXCAVATING FOR THE MARKING OF UNDERGROUND MEMBER UTILITIES.

26 5K - B - L SQ. FT. (PHASE I) (PHASE II) ZONING MH - MANUFACTURED HOME KUM & GO 300 SUBDIVISION PRELIMINARY UTILITY PLAN 4690 Table Mountain Drive Suite 200 TEL OA # Golden, CO FAX PRELIMINARY NOT FOR CONSTRUCTION LOT 2 - FUTURE PECOS STREET (R.O.W. VARIES) (PHASE I) (PHASE II) RESTAURANT W/ DRIVE THRU 61,323 SF / ACRES 3,150 SF BLDG LOT 3 - FUTURE COMMERCIAL / RETAIL 76,943 SF / ACRES 9,035 SF BLDG ZONING MF - MULTI FAMILY FLAG NOTES: (PHASE II) (PHASE I) (PHASE II) (PHASE I) 6400 Westown Parkway West Des Moines, Iowa P: F: WATER ZONE 4 ZONING MF - MULTI FAMILY LOT 1 COMMERCIAL 139,862 SF / ACRES 4,992 SF BLDG FEDERAL HEIGHTS CITY LIMITS THORNTON CITY LIMITS NOTE: DATE REVISION DESCRIPTION REVISIONS W. 88TH AVENUE (100' R.O.W.) ZONING CR - COMMUNITY RETAIL ZONING MF - MULTI FAMILY THIS PROJECT IS REGISTERED UNDER THE LEED GREEN BUILDING CERTIFICATION PROGRAM. R Know what's CALL 811 SEVENTY-TWO HOURS PRIOR TO DIGGING, GRADING OR EXCAVATING FOR THE MARKING OF UNDERGROUND MEMBER UTILITIES.

27 5K - B - L SQ. FT. (PHASE I) (PHASE II) ZONING MH - MANUFACTURED HOME KUM & GO 300 SUBDIVISION PRELIMINARY UTILITY PLAN FLAG NOTES: CR - COMMUNITY RETAIL MATCHLINE, SEE OVERALL PLAN MATCHLINE, SEE CONNECTION PLAN W. 88TH AVENUE PRELIMINARY NOT FOR CONSTRUCTION 4690 Table Mountain Drive Suite 200 TEL OA # Golden, CO FAX PECOS STREET (R.O.W. VARIES) (PHASE I) (PHASE II) LOT 2 - FUTURE RESTAURANT W/ DRIVE THRU 61,323 SF / ACRES 3,150 SF BLDG LOT 3 - FUTURE COMMERCIAL / RETAIL 76,943 SF / ACRES 9,035 SF BLDG ZONING MF - MULTI FAMILY PRELIMINARY SANITARY SEWER PLAN NOTES: OSAGE STREET (PHASE II) (PHASE I) (PHASE II) (PHASE I) CONNECTION PLAN 1" = 40' 6400 Westown Parkway West Des Moines, Iowa P: F: ZONING MF - MULTI FAMILY ANTICIPATED PEAK FLOW TABLE LOT 1 LOT USE LOT AREA (AC) GAL per AC per DAY AVERAGE DAILY DEMAND (GPD) PEAKING FACTOR MAX. DAILY AVERAGE DAY (GPD) FEDERAL HEIGHTS CITY LIMITS THORNTON CITY LIMITS COMMERCIAL 139,862 SF / ACRES 4,992 SF BLDG MATCHLINE, SEE OVERALL PLAN MATCHLINE, SEE CONNECTION PLAN LOT 1 LOT 2 LOT 3 CONVENIENCE / FUEL RESTAURANT W/ DRIVE THRU COMMERCIAL / RETAIL ,000 3, , ,000 1, , ,000 1, ,298 TOTAL SITE MIXED USE ,000 6, ,155 NOTE: DATE REVISION DESCRIPTION REVISIONS W. 88TH AVENUE (100' R.O.W.) ZONING CR - COMMUNITY RETAIL ZONING MF - MULTI FAMILY THIS PROJECT IS REGISTERED UNDER THE LEED GREEN BUILDING CERTIFICATION PROGRAM. R Know what's CALL 811 SEVENTY-TWO HOURS PRIOR TO DIGGING, GRADING OR EXCAVATING FOR THE MARKING OF UNDERGROUND MEMBER UTILITIES.