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Home My WebLink AboutKENNY ROGERS ROASTERS PUD - PRELIMINARY & FINAL - 6-87F - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORT� PRELIMINARY/FINAL GE AND EROSION CONTROL STUDY FOR KENNY ROGERS ROASTERS FORT COLLINS, COLORADO � v.r � PRELIM{NARY/FINAL DRAINAGE AND EROSION CONTROL STUDY FOR KENNY ROGERS ROASTERS FORT COLLINS, COLORADO December 2, 1993 Prepared for: Client: Curtis Zock 205 Dartmouth Trail Fort Collins, Colorado 80525 Prepared by: RBD, Inc. Engineering Consultants 209 South Meldrum Fort Collins, Colorado 80521 (303) 482-5922 RBD Job No. 563-002 � � � �r � � � � � ,�INC. E�ac�ineering Consultants ��09 S. Meldrum Fort Collins, Colorado 80521 ;0^/4II2-5922 =AY,: 303/482-6368 November 9, 1993 � Mr. Glen Schleuter City of Fort Collins Utility Services Stormwater � 235 Mathews Fort Collins, Colorado 80522 � RE: Preliminary/Final Drainage and Erosion Control Study for Kenny Rogers Roasters � � � � !� Dear G{en: We are pleased to submit to you, for your review and approval, this Preliminary/Final Drainage and Erosion Control Study for Kenny Rogers Roasters. All computations within this report have been completed in compliance with the City of Fort Collins Storm Drainage Design Criteria. We appreciate your time and consideration in reviewing this submittal. Please call if you have any questions. RespectFulfy, RBD Inc. Engineering Consultants � rry P. Mc n � • � Kevi W. Gingery, P. . � � �� Other Offices: Derner 303/458-5526 • Vail 303/476-f340 � "� .... TABLE OF CONTENTS �ESCRiPTdt,�N I. GENERAL LOCATION AND DESCRIPTION A. LOCATION B. DESCRIPTION OF PROPERTY II. DRAINAGE BASINS A. MAJOR BASIN DESCRIPTION � B. SUB-BASIN DESCRIPTION III. DRAINAGE DESIGN CRITERIA A. REGULATIONS B. DEVELOPMENT CRITERIA REFERENCE AND CONSTRAINTS C. HYDROLOGICAL CRITERIA D. HYDRAULIC CRITERIA E. VARIANCES FROM CRITERIA lV. DRAINAGE FACILITY DESIGN A. GENERAL CONCEPT B. SPECIFIC DETAILS V. STORM WATER QUALITY A. GENERAL CONCEPT B. SPECIFIC DETAILS VI. EROSION CONTROL A. GENERAL CONCEPT VII. CONCLUSIONS A. COMPLIANCE WITH STANDARDS B. DRAINAGE CONCEPT C. STORM WATER QUALITY D. EROSION CONTROL CONCEPT REFERENCES APPENDIX A VICINITY MAPS HYDROLOGY EROSION CONTROL PAGE 1 1 1 2 2 2 2 2 3 3 3 3 4 4 4 5 5 5 5 A1 A2 .s�. � � PRELIMINARY/FINAL DRAINAGE AND EROSION CONTROL SiUDY FOR KENt�Y ROGERS ROASTERS FORT COLLlNS, COLORADO I. GENERAL LOCATION AND DESCRIPTION A. B. Location The proposed restaurant Kenney Rogers Roasters is to be located at the southeast corner of East Monroe Avenue and South Coilege Avenue in the commercial shopping mall, "The Square". The site is shown on a Vicinity Map in the appendix: More particularly, the proposed development is located in the Southwest Quarter of Section 25, Township 7 North, Range 69 West of the Sixth P.M., Larimer County, Colorado. Descri�tion of Propertx The site for Kenny Rogers Roasters contains approximately 0.63 acres of area that is currently a part of the paved parking lot for the shopping mall "The Square". The perimeter of the site is landscaped with turf grass, trees, and shrubs. The property is bounded on the north by East Monroe Avenue, on the west by South College Avenue, and on the east by an entrance drive to the mall. A section of the existing paved parking lot along the south side of the site will remain in place. The site generally slopes downward from northwest to southeast at approximately 5 percent grade. The Larimer County No.2 Canal crosses the northwest corner of the site. II. DRAINAGE BASINS A. Ma�or Basin Description The site is located in the a map in the Appendix (SWMM) study by Reso� Foothills Basin. This drainage area is shown on taken from a Storm Water Management Model rce Consultants, Incorporated. � � I► +w � B. Sub-Basin Descriptior� � Existing developed drainage patterns for the site are southeasterly. Runoff flows offsite along the entrance drive on the west and south side of 'The � Square". Flows from "The Square" enter an offsite storm sewer on John F. Kennedy Parkway that carries it to Warren Lake. Sub-basin 1 incorporates the entire site as well as some of the landscaping along the � north and west sides of the site. This preliminary report addresses no other off-site runoff. lil. DRAINAGE DESIGN CRITERIA A. Regulations All regulations as established by the City of Fort Collins Stormwater Utility will be used for this preliminary drainage study. B. Development Criteria Reference and Constraints Drainage criteria are in accordance with the City of Fort Collins Storm Drainage Design Criteria and Construction Manual. On-site detention is not required for the site. The impervious area of the site would decrease from 0.515 acres (existing) to 0.47 acres after the project is completed. Therefore, existing off-site drainage patterns will not be adversely effected at all. Flow patterns proposed for the site will remain nearly the same as for the existing conditions. The only exception is that runoff from the north or west sides of the proposed building will be intercepted by the drive-through lane which conveys it around the building. C. Hydrological Criteria The rational method was used to determine the peak runoff peak from the site. The 10 and 100 year rainfall criteria, which was obtained from the City of Fort Collins, is the criteria which was utilized for this study. The calculations are included in the Appendix. D. Hydraulic Criteria All calculations within this study have been prepared in accordance with the City of Fort Collins Storm Drainage Criteria. 2 � � � � �r,�r► 'w►' '...� E. Variances from Criteria A variance is requested from a required sediment/oil separator with the trash enclosure. A structure like this is more applicable to a restaurant that disposes of large amounts of oil from deep fat friers. Kenny Rogers Roasters cooks using roasting ovens, thereby eliminating the need for sediment/oil separator. IV. DRA{NAGE FACILITY DESIGN A. General Concept As construction on the site progresses, the drainage and erosion control concepts shown on the Preliminary Drainage and Erosion Control Plan, in the back pocket of this report, should be followed. B. Specific Details If groundwater is encountered during construction, a Colorado Department of Health Construction Dewatering Permit will be required. The site has adequate elevation relief to provide for surface drainage. Runoff will flow generally from the northwest corner of the site. It would flow around the proposed building and across the parking lot to converge at the southeast corner of the site (Design Point #1). V. STORM WATER QUALITY A. GENERAL CONCEPT Beginning in October of 1992, the water quality of storm water runoff was required to be addressed on all final design utility plans. The Kenny Rogers Roasters development is anticipating construction beginning in 1994. Therefore, for this study, we have sought to find various Best Management Practices for the treatment of storm water runoff. 3 � � � � � � VI. � � � � � Vlt. � � ... B. SPECIFIC DETAiLS It is our understanding that, for this site, storm water quality should address the prevention of contamination of runoff. This can be accomplished during the daily operation of the restaurant itself. Since most of the site is paved parking, sediment control is not going to be a problem. But, the owner should address operational procedures for pollution control and keeping the area trash free. EROSION CONTROL A. General Conceqt Kenny Rogers Roasters lies within the Moderate R�infall Erodibility Zone and the Moderate Wind Erodibility Zone according to the City of Fort Collins zone maps. The City of Fort Collins Erosion Control Reference Manual for Construction Sites specifies that the erosion control performance standard will need to be calculated and appropriate measures taken to control erosion from the site. Erosion control features are shown on the Preliminary/Final Drainage, Grading, and Erosion Control Plan. Gravel mulch and sandbag barriers will be the main erosion control measures used during construction. Gravel mulch will be used over a 4,000 square foot area to protect bare ground south of the proposed building from erosion. Sandbag barriers are to be used to temporarily detain runoff to allow settfing of sediment. The erosion control pertormance standard and e�ciency for the measures to be used on-site are shown in calculations in the Appendix. All construction activities must also comply with the State of Colorado permitting process for Stormwater Discharges Associated with Construction Activity. A Colorado Department of Health NPDES Permit will be required before any construction grading can begin. con�c�usiorvs A. Gompliance with Standards All computations within this report have been completed in campliance with the City of Fort Collins Storm Drainage Design Criteria. � � � �'� �. � � � Irl Drainage Cancept The drainage of stormwater runofF from the site will be less concentrated after construction of Kenny Rogers Roasters than for the existing site conditions. The previous drainage plan for "The Square" adequately hanc{les the runoff for the existing site, therefore, no site detention nor additional drainage structures are required. Flows in the irrigation canal will remain the same as before the project is constructed. If groundwater is encountered during the construction of any portion of the site and dewatering is used to install utilities, then a State of Colorado construction Dewatering Wastewater Discharge Permit will be required in order for this water to be discharged into any waters of the United States. � Storm Water Wuaiitv Because storm water quality has become a requirement, the site will need to address this storm water aspect. After construction, the owner of the restaurant will have to be responsible for keeping the site clean so that runoff is not polluted. � Erosian Control Conceqt Appropriate erosion control measures and calculations of the overall performance standard for the site have been completed according to the City of Fort Collins Erosion Control Reference Manual for Construction Sites. � REFERENCES 1. 2. Storm Drainage Design Criteria and Gonstruction Standards, by the City of Fort Collins, Colorado, May 1984, revised March 1991. Erosion Control Reference Manual for Construction Sites, by the City of Fort Collins, Colorado, January, 1991. 5 �