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City of Sun Prairie Recycling Center Relocation Storm Water Management and Erosion Control Plan August 1998 Conditional Use Permit— 1508 This storm water management and erosion control plan are a supplement to the May 27, 1998 report by Larry Herman,Sun Prairie Director of Public Works,and a response to comments from Brian Standing, DCRPC,dated July 23, 1998. This report was prepared by Katherine Kalscheur,P.E.,MSA Professional Services, Madison, WI at the request of the City of Sun Prairie. Existing Conditions The site is currently used for clean fill by the Sun Prairie Water&Light Commission. The fill is rough graded and approximately 1.4 acres in size. The site is currently accessed through the paved entrance to the little league ballfields on Bird Street, then south across the gravel parking area. Hellenbrand Landscaping is located to the east adjacent to the site. See the attached site map. Drainage: The area around the site generally drains to the south and west toward a tributary to Koshkonong Creek. The filled area is currently graded to drain to the north east—away from the creek. Groundwater: We assume ground water movement in this area is also south and west toward Koshkonong Creek. Properties with wells in this area are located southeast of the site. The well at the Flamme property is currently tested by the City due to it's proximity to the old landfill. Proposed Facilities Entrance: The Recycle Center will be located south of the existing gravel parking area. A 24-foot wide "drive"will be paved along the east side of the existing gravel parking area. The remainder of the gravel parking area will be unchanged. The south side of the existing gravel parking area will be fenced and screened, and a gate will be located across the end of the paved"drive". A 100'x30' gravel drive will extend into the Recycle Center from the south end of the paved"drive". Only the currently filled area will be used for the Recycle Center, and the existing fill soils will be the base of the Recycle Center. The existing fill area will be finish graded to constant surface. The fill will be covered with a minimum of 4 inches of wood chips. This will provide a stable surface capable of withstanding the light vehicle traffic typical at the Recycle Center. The City has an ample supply of wood chips from their brush collection. Drainage: The existing drainage pattern—from the southwest toward the northeast will be maintained for the Recycle Center drainage. This will maximize the flow distance from the recycle Center to the NSA PROFESSIONAL TRANSPORTATION•MUNICIPAL•REMEDIATION DEVELOPMENT•ENVIRONMENTAL 1 G:\projects\30s\36\369834\stm_rpt.wpd