Agenda - Planning Commission - 10/02/2003

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Pleasureland RV - Site Plan September 24, 2003 Page 5 of 6 Drainage and Grading: At the .present.. time, discharge from the street and sm'rounding vacant property flows overland to a point in the south curb line of Riverdale Drive, which is approximately 240 feet west of Alpaca Street. This low point discharges through a bituminous spillway into a ~ass-lined swale which flows approximately 300 feet south into a iow area on the property located at 14322 Alpaca Street, which is encumbered with a drainage and utility easement. The proposed grading and drainage plans anticipate directing tl{e parking lot and building runoff overland fi'om west to east into two ponds. The pond located on the southeast comer of the northern portion of the development is 140 feet by 50 feet and contains 0.56 acre feet. This pond discharges tbh'ough a storm sewer to a second pond which is located along the southern boundm'y of the southern half of the development. This pond is 50 to 105 feet in width and is 560 feet long. This southerly pond also accepts runoff from the southern half of the development. The ponding system is designed to hold runoff from a 100-year storm event fhlling on the deve. topment site. Any flows in excess of this amount would be discharged into ~he roadside ditch on the west side of Alpaca Drive. This ditch flows south and west and eventually discharges to the Mississippi River. Staff offers the ~bllowing comments on the g/:ading and drainage plan: Curbing must surround all paved areas including those adjacent to the detention pond. Additional catch basin structures may be required. Overland drainage fi'om the site must be contained on the site. It must not discharge onto Riverdale Drive. Additional elevations on the curb and gutter must be provided. This development requ/ires'(and has received) a permit ti'om the Lower Rum River Water Management Organization. A pmznit fi'om the Mi~mesota Pollution Control Agency is also required. Access: The site proposes four accesses onto Riverdale Drivel two fi:om the north sales lot and two from the south sales lot. The accesses on the south and north sides of the roadway should be realigned so that they are directly opposite one another. This is the safest arrangement ~br traffic exiting the site. The access into the service bay is proposed to be 108 feet wide, to be expanded to 212 feet when the additional service bays are constructed. This width of driveway is not acceptable. [t is recommended that the driveway be limited to a maximum of 35 feet in width. Storm Water Management Fee: The City has enacted a StmTnwater Management Fee and the cra'rent rate is Th~'ee Thousand Seven Hundred Forty One Dollars ($3,741.00)per commercial acre. The amount of Stormwater Management Fee due on the 10.5-acre parcel is Thirty-Nine Thousand Eight Two Hundred Eighty, Dollars ($39,280.00). A cash payment will be required prior to the City issuing a Building Permit.