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Home My WebLink AboutTIDAL WAVE CARWASH - PDP - 38-01 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTIM wm � PROJECT SITE 11 c, cr D G > a d,pgy, d rAuaa � a rT riiF c 'ScT 4� i py aaia.r n /� cW'`+ir cr I � 3 d $ �� w gWS1W i 33 oa, nes cr MA Im[ O [ IWtII100➢11D FS 6 ? swq.T n +� ulaYm � own,Imc a W[d 'II A[4mM �' � Wn (i Tad% �xS!_fi3e ' 'Y� i I KY Yw�rw n sarx c S * 9�: �i` ..2� •.�rl. z. wnun n [� sonu M � I [� �w1W � a OaY)6IIt n 6 IIGAA•II Ci AtlM Yr S S oWaux C A. Yommco n ,. Yo.wm n �^4 66C Wp °xrrl aaYgr n 41 , I. S�I [r 4�t cr S T 6 °'Y��'T agnrw nm ayp yt, a 4 a <� 11MA9Q S k \ 4S • d w geea ■ � sA'or ooK uI ■pR � cu[ L a [D c��j � ySrQ F 3G d W'� Mk6 iO rAMYN W p c-Tok OrYM L /1 > yplR VIAL w IMR � Mr10AlR F Ey Y 4 Yr cr S 4 y d y Sh s noun 4 a,4A aY 4 • ruxYAr uI rI>tYAr ui �. z i. vlracr ora CT x o.A YAAw cr ux aA ct I 1 APPENDIX A VICINITY MAP 11 1 1 1 I I I 1 A I 7. REFERENCES 1. City of Fort Collins, "Storm Drainage Criteria Manual", (SDCM), dated March, 1986. 2. The Final Drainage Report for the Market Place by Parsons & Associates dated July, 1989. 3. The Final Drainage Report for Heart Special Improvement District by Engineering Professionals, Inc. dated January 1985. 4. Urban Drainage and Flood Control District, "Urban Storm Drainage Criteria Manual", Volumes 1 and 2, dated March, 1969, and Volume 3 dated September, 1992. 6 I shown on the Detail Sheet with base material consisting of 6" coarse aggregate. The contractor will be responsible for clearing tracked mud on a daily basis. 5.5 Maintenance All temporary and permanent erosion and sediment control practices must be maintained and repaired as needed to assure continued performance of their intended function. Silt fences will require periodic replacement. Maintenance is the responsibility of the contractor. 1 6. CONCLUSIONS ' 6.1 Compliance with Standards ' All computations that have been completed within this report are in compliance with the City of Fort Collins Storm Drainage Design Criteria Manual. 1 6.2 Drainage Concept The proposed drainage concepts presented in this report and on the construction plans adequately provide for the detention and transmission of developed on -site runoff to the ' existing storm system. The impact of the development of this site on existing downstream facilities is not substantial. Detention is being provided to meet requirements set by the Final Drainage Report for the Market Place and the Final tDrainage Report for Heart Special improvement District. If, at the time of construction, groundwater is encountered, a Colorado Department of Health Construction Dewatering Permit would be required. 6.3 Erosion Control Concept Since the site is less than 5.0 acres, a NPDES permit is not required. During construction, erosion control shall be maintained to minimize erosion on this site and transport of silt downstream. 1 5 I I 1 4.4 Variance Requests 1 No variances are being requested at this time. 1 5. EROSION CONTROL 1 5.1 General Concept This site lies within the Moderate Rainfall and Wind Erodibility Zone per the City of Fort Collins Zone Maps. A potential exists for silt movement from the site to be transported into the existing ponds located to the south of the site. All erosion control measures necessary to minimize sediment transport have been shown on the Erosion Control Plan. 1 5.2 Specific Details ' To limit the amount of silt leaving the site, several erosion control measures shall be implemented during construction. Silt fence shall be installed along the southern and eastern sides of proposed site. Also, vehicle -tracking pads shall be installed at the two 1 entrance the existing asphalt drive to control the mud being tracked onto the existing pavement. During overlot grading, disturbed areas are to be kept in a roughened ' condition and watered to reduce wind erosion. ' 5.3 Dust Abatement During the performance of the work required by these plans, the contractor shall carry out proper efficient measures wherever and as necessary to reduce dust nuisance, and to prevent dust nuisance, which has originated from his operations from damaging crops, orchards, cultivated fields and dwellings, or causing nuisance to persons. The Contractor will be held liable for any damage resulting from dust originating from his operations under these plans, on right-of-way or elsewhere. 5.4 Tracking Mud Wherever construction vehicles access routes intersect paved public roads, provisions shall be made to minimize the transport of sediment (mud) by runoff or vehicles tracking onto the paved surface. A stabilized construction entrance is required per the detail 4 I I 3.4 Hydraulic Criteria All hydraulic calculations within this report have been prepared in accordance with the City of Fort Collins Drainage Criteria and are also included in Appendix B of this report. 4. DRAINAGE FACILITY DESIGN 4.1 General Concept ' The runoff from this site will flow south in the parking lot via pans and curb & gutter to ' the proposed detention pond. The flow will be detained in the proposed pond and released at the predetermined rate discussed above. ' 4.2 Specific Flow Routing A summary of the drainage patterns within each basin is provided in the following paragraphs. For more specific details see the calculations located in Appendix B of this report. Sub -basin 1 contains the east portion of the site including the east half of the building, a portion of the drive areas and a portion of the landscaped area. Runoff from this basin flows to the east to the proposed curb which will convey the flow south to a curb opening. ' The flow then is conveyed by a concrete pan to the detention area. Sub -basin 2 contains the west portion of the site including the west half of the building and a portion of the drive areas. Runoff from Sub -basin 2 collects in a concrete pan in the drive and is conveyed directly into the detention pond. 4.3 Drainage Summary The storm conveyance system is a surface and sub -surface system and has been designed for minimal maintenance. The proposed storm sewer system (outlet structure and pans) and the detention pond will be owned and maintained by the property owners. The existing storm system shall be maintained by the City of Fort Collins or other responsible parties. 3 c I 1 3. DRAINAGE DESIGN CRITERIA 1 3.1 Regulations 1 This report was prepared to meet or exceed the "City of Fort Collins Storm Drainage Design Criteria Manual' specifications. Where applicable, the criteria established in the 1 "Urban Storm Drainage Criteria Manual' (UDFCD), 1984, developed by the Denver Regional Council of Governments, has been used. 1 3.2 Development Criteria Reference and Constraints 1 The runoff from this site and the allowable release rate has been routed to conform to existing drainage reports completed that have included this area. The streets and associated drainage systems surrounding the site are existing. There is a storm system existing on the south west comer of the site. This site is intended to discharge into that system. Therefore, a pipe is proposed to be stubbed from the existing manhole into the proposed detention area. 1 Detention is proposed for this site and release will be restricted to the previously calculated rate of 0.87 cfs per acre (0.66 cfs). Runoff from the site was calculated based on the rainfall criteria adopted by the City of Fort Collins on March 26, 1999. Water quality measures will also be provided in the form of extended detention. 3.3 Hydrologic Criteria Runoff computations were prepared for the 2-year minor and 100-year major storm frequency utilizing the rational method. i All hydrologic calculations associated with the basins are included in Appendix B of this 1' report. Standard Form 8 (SF-8) provides time of concentration calculations for all sub - basins. Standard Form 9 (SF-9) provides a summary of the design flows for all Sub - basins and Design Points associated with this site. 1 2 I 1 GENERAL LOCATION AND DESCRIPTION 1.1 Location This site is located in a tract of land in the Southwest Quarter of Section 36, Township 7 North, Range 69 West of the Sixth Principal Meridian, in the City of Fort Collins, County of Larimer, State of Colorado. See the location map in Appendix A. ' The project is located north of Troutman Parkway and west of JFK Parkway. The site is bounded by existing commercial development on the west and north boundaries and by ' existing streets on the south and east boundaries. 1.2 Description of Property The entire project consists of 0.82 acres of land. The land is currently undeveloped and slopes to the southwest at approximately 1% to 4%. The runoff from the site currently appears to pond on site without a point of release. ' The project will consist of a single structure which will be a 6 bay car wash and associated drives and queuing area. The site will access from an existing asphalt drive which loops from Troutman to JFK. 2. DRAINAGE BASINS AND SUB -BASINS 2.1 Major Basin Description The proposed development lies within the McClellands Mail Creek Drainage Basin. The site is included in the area covered by the Final Drainage Report for the Market Place and the Final Drainage Report for Heart Special Improvement District. Portions of these reports are included in Appendix E. These reports allow for a release from this site of 0.87 cfs per acre which was calculated to be the 2-year historic runoff by the above mentioned reports. This runoff will discharge into the No. 2 Canal south of the site. 2.2 Sub -basin Description Sub -basins are described thoroughly in Section 4.2. 1 11 I I TABLE OF CONTENTS 'TABLE OF CONTENTS.............................................................................................................................m 1. GENERAL LOCATION AND DESCRIPTION 1.1 Location...............................................................................................................................I 1.2 Description of Property ........................................................................................................1 ' 2. DRAINAGE BASINS AND SUB -BASINS 2.1 Major Basin Description......................................................................................................1 2.2 Sub -Basin Description......................................................................................................... I 3. DRAINAGE DESIGN CRITERIA 3.1 Regulations..........................................................................................................................2 3.2 Development Criteria Reference and Constraints................................................................2 3.3 Hydrologic Criteria..............................................................................................................2 3.4 Hydraulic Criteria................................................................................................................3 ' 4. DRAINAGE FACILITY DESIGN 4.1 General Concept..................................................................................................................3 4.2 Specific Flow Routing.........................................................................................................3 4.3 Drainage Summary ..............................................................................................................3 4.4 Variance Requests...............................................................................................................4 ' 5. EROSION CONTROL 5.1 General Concept..................................................................................................................4 5.2 Specific Details....................................................................................................................4 5.3 Dust Abatement...................................................................................................................4 5.4 Tracking Mud......................................................................................................................4 5.5 Maintenance........................................................................................................................ 5 ' 6. CONCLUSIONS 6.1 Compliance with Standards................................................................................................5 6.2 Drainage Concept................................................................................................................ 5 ' 6.3 Water Quality and Erosion Control Concept.......................................................................5 7. REFERENCES.................................................................................................................................6 APPENDICES B C D 1 1 Vicinity Map Hydrologic Computations Detention and Water Quality Calculations Figures and Tables Excerpts from Previous Reports iii r I North Star �AOOIA*mm, design, inc. ISeptember 4, 2001 Basil Hamdan City of Fort Collins Stormwater 700 Wood Street Fort Collins, CO 80522-0580 ' RE: Final Drainage Report for Tidal Wave Car Wash Dear Basil, ■ I am pleased to submit for your review and approval, this Final Drainage & Erosion Control Report for Tidal Wave Car Wash. I certify that this report for the drainage design of Tidal Wave Car Wash was prepared in accordance with the criteria in the City of Fort Collins Storm Drainage Manual. I appreciate your time and consideration in reviewing this submittal. Please call if you have any questions. Si ely, 1 Patricia Kroetch, P.E. North Star Design, Inc. 1 ii 700 Automation Drive, Unit I Windsor, Colorado 80550 t970-686-6939 Phone 970-686-1188 Fax FINAL DRAINAGE AND EROSION CONTROL REPORT TIDAL WAVE CAR WASH Prepared for: Rhey Wright 5238 Fox Hills Drive Fort Collins, CO 80526 Prepared by: North Star Design, Inc. 700 Automation Drive, Unit I Windsor, Colorado 80550 Ph# (970) 686-6939 Fax# (970) 686-1188 September 3, 2001 Job Number 159-01