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ci u tV 1. SRAQ1��_i��_pB�1N A Stormwater Management Plan is being prepared as part of the required grading and drainage plan. The col lege is applying for a permit from the Rice Creek Watershed District under which a detailed plan and computer model showing all elevations, pipe design. pond sixes and runoff rates will be shown. The Stormwater Management PI an is expected to be approved prior to PUD acceptance. The enclosed Grading and Drainage PI an, Exhibit F, addresses information included In the Stormwater Management Plan, and describes all grading and drainage improvements to the existing facilities. The majority of the area of the cot lege in Roseville drains to the exi sti ng pond I ocated just west of the exi sti ng resl dense hai I s. Observations of existing conditions at the pond show the OHW (ordinary high water) to be approximately Elevation 902.5. Historic water levels between storms tends to be close to Elevation 901. Since the current pond outlet is set at 905.6, It shows this area to have a high i of i I trati on rate. Observations by college personnel indicate that the elevation of the pond only infrequently reaches the outlet elevation. The existing outlet structure is designed to skim oils and f I catabl a materi al s as requi red by the Rice Creek Watershed District. The following Is a I i st of proposed improvements to the existing campus plan and the drainage modifications needed to meet requirements of the Rice Creek Watershed District. New Parking Lots A $ B are proposed to drain into the existing pond. Exi st-i ng contours show the parki ng I ots natural I y drai n toward the pond. Some ponds ng and/or drainage swat es or cuI verts w i I I be used i n the parki ng I ots to improve drai nage to the pond. 2. New Parking Lots C and D are proposed to be designed to provide controlled ponding and runoff on the lots themselves. Al I new roads and parking lots are to be constructed with curb and rgutter to allow better drainage control. Additional pondi ng and erosion control w i I I be prov ided as necessary to control the runoff to Rice Creek and Little Johanna. 3. An existing low area adjacent to the proposed Life and Health Fitness Center, which currently does not normally have standing water, will be developed to provide storage and detention for runoff from the Life and Health Fitness Center and the proposed new residence hall. Limited roof pondi ng will be provided on both bu i I d i ngs . 1 -12- 8621