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HomeMy WebLinkAbout08 - Design Report - CVS Pharmacy - Stormwater STORM WATER MANAGEMENT DESIGN REPORT FOR CVSIPHARMACY BOZEMAN, MONTANA August 2008 Prepared For: CVS/pharmacy c/o The Velmen Companies 5757 West Maple Road, Suite 800 West Bloomfield, MI 48322-2277 %",' 1� MORRISON �- k F MMERLEINC. ` An Employee-Owned Company Prepared By: Morrison-Maierle, Inc. 2880 Technology Boulevard West Bozeman, MT 59718 Phone: (406) 587-0721 Fax: (406) 922-6702 MMI Project No. 4480.001.01.020.0310 ANI RFUSON t Storm Wlater Management De ign Report— CVS/pharmacy PURPOSE OF REPORT AND DESIGN OBJECTIVES This design report summarizes the management plan for storm water runoff from the CVS/pharmacy site'redevelopment proposed to be located in Bozeman, Montana. The information contained in this report summarizes the basis of design for necessary storm drainage improvements. The methodology and analysis procedures utilized in this report are based on the standards found in the City of Bozeman De ign Standards and Specifications Policy, February 2008. PROPOSED DEVELOPMENT Location The proposed development is located in Bozeman, Montana on Lots 1 and 2A, Block 8 of West Park Manor, First Addition in the southeast quarter of the northeast quarter of Section 11, Township 2 South, Range 5 East, Principal Meridian of Montana. Generally, the property is bordered by North 19th Avenue to the east,West Main Street to the south, North 20th Avenut and Pierce Flooring to the west, and the Town &Country grocery store to the north. The site location is depicted in Figure 1. Development Description The proposed site would include four buildings on a total site area of approximately 4.36 acres (189,728 fe). The proposed CVS/pharmacy building would be approximately 14,480 square feet(fe) in size. The additional buildings proposed for the site include two potential retail uses (6,000 and 4,460 ftz) as well as a potential office/bank/retail building approximately 12,000 fe in size. The proposed site layout is shown in Figure 2. Development Horizon It is currently proposed to install the improvements necessary to serve the proposed CVS/pharmacy site with the initial development. Additional site improvements would be completed with the development of each remaining building pad site. It is estimated that full build-out of the site would occur by 2012. 1 MORRISON MAI�9 Storm 1VaterManagement Design Repod— CVS/pharmacy ii T,„3 _ ".-. P mj pi it E ,,._dam� � � _t "''_jl�---•-a��{�...i,., 4 f � £.._..._� �9 �•� ,i�j� \ �.,,. d, I- lq ,� �``i�� it � .� ki— '�` �� �h'_"�`7�!�""�� i ��`-,. � � • ' �l ....� MIN � -ems.. fg q 'ci Ed PROPOSED "I F { r �� . � SITE AiLS � i � `� r t ��. AN LLI 191ULU ! ! 4q3 / 141 i Figure 15ite Location 2 RMON MO Storm Water Mana ement De ri n Report— CVS/pharmacy ll�lrill , �. 8 g M fey ip.wMYx+'wltampxvfi � 1 i t ti Mat B-4 l of \� y RU as.e Ni9TH AT, 1 ycM�l.ra Figure 2 Site Layout EXISTING AREA CONDITIONS The proposed site redevelopment is located on property currently occupied by the JC Billion automotive dealership. Presently, there is not a functioning storm water management system in place on the site. Additionally, the site is nearly 100 percent impervious surfaces as there is very limited landscaping. Storm water runoff surface flows across the property and either drains onto North 19th Avenue or North 20th Avenue. There is some ponding on-site in depressed areas where the pavement surface has settled. 3 iA Aist111 Storm IYlaterMana ement Deri n Re port CVS karma � 1 »��.. d d if g STORM RUNOFF CALCULATIONS Storm water runoff calculations were performed using the Modified Rational Method for post- development conditions. Pre-development conditions were not analyzed as the existing site is nearly completely impervious and storm water is surface drained to the adjacent streets. The proposed improvements will incorporate on-site detention with overflows for large storm events. This will be an improvement over the existing situation. Calculations used for sizing of the on-site systems can be found in the appendix. MAINTENANCE Maintenance of detention basins and storm drainage facilities is essential. General objectives of maintenance are to prevent clogging, standing water and the growth of weeds and wetland plants. This requires frequent unclogging of the outlets, inlets, and mowing. Cleaning out sediment with earth-moving equipment may also be necessary in 10 to 20 years. Inlets and storage facilities should be inspected at least once a year. Any necessary repair or maintenance should be prioritized, and scheduled through the spring, summer, and fall. 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