04/25/2001 Env Bd Packet - Laserfiche WebLink

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CYAN buildings and tied into the city main near the two sanitary sewer connections stated above as well as connecting to the 77th Street water main. Refer to utility plans. Building down spouts and the majority of the parking lot storm water runoff is being planned to convey through a system of new storm sewer on site and connect to a new runoff and treatment pond located on the east side of the site. Storm water runoff calculations are included in Exhibit F of this narrative for verification purposes. Planned earthwork will involve the excavation, filling, export and import of soil materials. On site balance, without import and export of materials cannot be achieved due to the extent of organic soil material on the site. APPLICANT is intending to use BMP's (Best Management Practices) for storm water runoff that meet City and watershed district objectives. APPLICANT has incorporated depressed islands and areas to improve infiltration properties. Along the backs of curb and gutter section, where appropriate, infiltration trenches are planned to reduce storm water runoff. A bio -swale along the south side of 77th Street and north of SuperTarget will also be constructed. In addition, bio- retention basins in the northeastern and southeastern comers of the site aid to increase over all infiltration objectives. APPLICANT had a number of soil borings on the site. Refer to Exhibit H Soil Borings for additional information concerning site soil conditions. The APPLICANT also requests preliminary Development Plan review and approval of a Planned Development Overlay District. PARSONS TRANSPORTATION GROUP Barton- Aachman • Da Lauw, Lather, • Steinman Town Center Narrative Page -6- 04/ 09/01