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f • Austin, George April 24, 1984 Page 8 "The City of Madison should construct permanent detention basins in the South Fork Pheasant Branch Creek subwatershed. The detention facilities should provide residence times of at least 24 hours . . . and should provide for . . . infiltration, where feasible." The original plan recommended two sites near the Beltline Highway for such detention. One of these sites has some serious limitations which will .limit its usefulness in meeting the plan's objectives. Thus, opportunities for large-scale public detention on the proposed research park site should be thoroughly evaluated. The site may offer one of the few remaining opportunities for Madison to reduce excessive peak flows and sediment in the South Fork caused by existing upstream development. Further, such detention might be carefully integrated into the natural topography of the proposed development site to enhance its overall aesthetic quality and attractiveness without reducing the area available for industrial development. In addition to the potential of the site to meet Madison's commitment to • control excessive peak flows and sediment from upstream off-site develop- ment, on-site runoff and erosion control must be thoroughly addressed. Madison should assist the developers of the site in identifying innova- tive and effective measures to meet the city's erosion and runoff control , ordinance. The amount of land disturbing activity proposed on the site will require extensive and thorough control of sediment to minimize additional loads to Pheasant Branch Creek and alleviate concerns which could be expressed by Middleton. Additional runoff generated by the research park could be addressed by combining required detention with that provided for off-site purposes, or by a combination of infiltration practices on each industrial users site and small , scattered detention basins throughout the site. To summarize, Madison must assess the opportunities offered by the Rural Insurance property to assist in meeting management objectives for the upper South Fork Pheasant Branch Creek. Stormwater detention on the site, if feasible, would be undertaken as part of a multi-site strategy. • In addition, thorough control of sediment generated during development of the research park and additional runoff from new impervious areas should be exercised. Sanitary Sewer Extension and Environmental Corridors Comments The Commission staff has received the sanitary sewer extension request for the RIK proposal for review. This review will be for the purposes of assuring: 1 ) that the proposed extension is not designed to serve lands outside of the Urban Service Area (during the planning period) ; 2) that no sewer service is proposed to be provided to lands within the designated environmental corridors; and 3) that the proposed extension '►,