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DANE COUNTY 'ci j r s LAND CONSERVATION DEPARTMENT 104 TT-_ yrri, FEN OAK RESOURCE CENTER 1 Fen Oak Ct.,Rm. 208,Madison,Wisconsin 53718-8812 PH:608/224-3730•FAX: 608/224-3745 TO: Dane a � Coun ty Zonin g , Jim Gregorius FROM: Aicardo Roa ° JAN T 9 !„.1n Urban Conservationist DATE: January 8, 1997 D.C.PLANNING&DEVELOPMEN 1- PROPERTY RECORDS RE: Review& Comments -Rezone/Cup# 7096/1490 w----------^-- Soil Erosion Control and Runoff Issues and Recommendations: Dates and period of the construction site to ensure that minimum sediment will be leaving the site under construction. Proposed design, suggested location and phased implementation of Erosion Control Plan to prevent and limit total off-site soil loss to an annual cumulative rate not to exceed 7.5 tons per acre per year. Descriptions of Methods by Which Sites Are To Be Developed: The method by which the site is going to be developed is important. In urban areas and under high density residential development,it is customary to disturb all the area. This complete disturbance requires controls for the construction period because the high probability of soil loss to the sensitive areas-- in this case Lake Windsor and the pond near the site to be developed. Provisions For Sequential Steps Mitigating Erosive Effect of Land Disturbing Activities: The site must present a buffer strip to mitigate the increase in runoff by the parking lots. The buffer strip also reduces the amount of sediment delivered to the pond and lake. The buffer strip filters the post development pollutants such as chlorides, heavy metals (copper, zinc, oil and grease, and fluids) associated with overnight parking exposed to rainfall. Provisions To Ensure No Increase In Surface Water Drainage From Sites During or After Construction: High density areas increase runoff and add pollutants that did not exist before such as chlorides, zinc, and copper. In many instances, a pond is required to reduce the runoff increase and the added pollutants to sensitive areas such as the pond and the lake.