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CWM E.r'GLNEERriG . - LANDSCAPE ARCHITECTURE 84 ENVIRONMENTAL SERVICES LIU3 N PLAT NLNG CONSTRUCTION SERIME5 MEMORANDUM .DATE: August 2, 2000 TO: File 10320 FROM: Don Shaffer SUBJECT: Stormwater Drainage for Apache Plaza Animal Hospital Addition HKS Project No. 10320 The proposed development consists of a building addition to the existing animal hospital located north of 37`h Avenue in St. Anthony, Minnesota. Included with the building addition,a new parking area will be constructed on the east side of the addition. Also,the parking area west of the existing building will be increased. Existing Conditions: An existing animal hospital and associated parking are located on a 1.55-acre parcel of land. Access to the site is from 37`h Avenue NE. Stormwater for the site currently drains overland to the north to a ditch along the railroad, east to an adjacent parcel of land and south to 37`h Avenue NE. Approximately 1.05 acres drains to the north, 0.29 • acres drains to 37`h Avenue NE and 0.21 acres drains to the east. The drainage areas are shown on the attached drainage area map. Storinv.ater draining from this site is carried east in the gutter to a catch basin approximately"300 feet from the east property line.No catch basins are located on 37'y Avenue NE adjacent to this site. City" staff indicated that the storm se«"er system in 37`h Avenue NE is at capacity and that any additional drainage could not be accepted by the system. Develoned Conditions It is proposed to construct an addition to the existing building, new parking area on the east side of the addition and increase the parking are on the west side of the existing building. The attached site plan indicates the proposed construction. Stormwater for the majority of the developed site will be carried overland and directed to the north. Storm% ater drainage from the west parking lot will be carried to 37`h Avenue NE. However, the stormwater from the east parking lot will be directed away from 37`�Avenue NE and carried to the north. Also, t!ie amount of stormwater carried to the adjacent parcel to the east will be decreased. The stornnwater on the parking lots-will drain overland to the north curb line. Curb cuts%vill be provided to permit the stormwater to drain over the grass area to the ditch along the railroad tracks. Riprap will be placed at tl e crab cuts to minimize erosion and also to help in dispersing the water. HKSASSOCIATL_`I.`•(, • 821 R_kYNOND ANINUE SUIT ill ST.PALZ,-%1N;;;" PHONE 651165 9.9-9' F.A-x 65"O;•)- . E-�Ltil: infu3hls��:uciu:::• : ..:.