08-20-1984 Planning Packet - Laserfiche WebLink

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enue North - 1 and SEction i required for I Avenue North ‘ North casement 000 sf of a 1 City has a designated at limner that the on area. The >f the wetland b wet times of rate to slow alvert in the assimilative of open water Irainage area he size of the ter #2 back to >y the NCWD and 'I- The City Engineer's report suggests a need to modify our current ordinance on wetlands. During the review of the Raster application eary this summer, the Council considered the many conflicts in the reports presented by the various reviewing agencies and the traditional position of the City regarding the alteration of designated wetlands. Council decided there was no need to change the ordinance but merely to set up criteria for such reviews and that if specific findings could be made, the alteration of the wetland would be considered. Review Criteria 1.Disposal of soils: Soils excavated from wetland could not be used to grade and fill banks of pond but had to be placed a minimum of 50 feet away from pond/wetland basin and hay bales staked around the spoils area. 2.Time of year alteration is performed: Suction dredging remains the best method but not always feasible. Early winter is the best time to dredge wetlands. In this application given the type of soils make up, early winter may be a must. 3.Location of dredged area within wetlands: Vegetation must not be disturbed between pond and outlet from wetland. Vegetation must remain to catch or filter sediment and slow down rate of flow. In this case, the grassy area at the 1032 elevation leading to culvert will serve as buffer—Conservation and Flowage easement should be amended to include newly defined protected area. 4.Replacement Factor - If the reviewing staff confirms reduction in assimilative capacity of wetland created by alteration than a matching area must be set aside to replace assimilative capacity. The extension of the protected wetland area south to the culvert providing additional grassy, permeable surface will provide replacement but adequacy of that replacement should be confirmed by hydraulic information. Staff Recommendation To approve the partial alteration of the designated wetlands on Lot 2, Willow Run based on the following findings: 1. The wetlands functions as a localized, seasonal collection basin and is not part of a major wetlands system. 2. Wetland is located in the outer edges of the watershed leading to Lake Minnetonka. 3. The grassy, seasonal wetlands assimilative capacity can be replaced by minor grading changes along the southern part of the lot. ■ V I f f M- I- -s V • ApproV Sta reg the the nec 25C (Cc thi Th a en li Th ve