02/27/2008 Env Bd Packet - Laserfiche WebLink

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ecologist should work with individual home builders, landscape contractors, and homeowners to ensure that this important site preparation step is accomplished on a lot by lot basis. Vegetation Establishment in Stormwater Ponds Stormwater treatment ponds within Foxborough's conservation areas have been excavated and rough graded during the initial site grading process in spring and summer of 2005. Water control structures, such as inlet and outlet pipes and weirs where installed prior to the initial grading of each stormwater basin. As required by the Minnesota Pollution Control Agency, silt fences have been installed along all edges of stormwater basins to minimize sedimentation of these basins or erosion of sediment into the surrounding conservation areas or off site wetlands. Stormwater treatment ponds will be fmal graded during the final phases of the overall site grading. Stormwater treatment ponds within the conservation area should be seeded and maintained as natural or semi - natural wetlands that compliment the surrounding natural communities within the conservation area. Therefore, only native, non - invasive plant species should be seeded into stormwater ponds. Native plant species that can tolerate fluctuating water levels and increased sediments, salt, and nutrients should be selected for each basin, and native seed mixes should be tailored to the design hydrology, soils, side slop e profiles, and topographic configurations of each stormwater treatment pond. Compensatory Wetland Mitigation Area A 1.99 -acre wetland mitigation area is under construction within the conservation area to mitigate for wetland impacts associated with the creation of residential lots and associated infrastructure within the Foxborough conservation development. This mitigation area has been excavated from a sandy upland knoll in the southeastern comer of the site during the site grading process in the summer of 2005. As required under the Minnesota Wetland Conservation Act rules, monitoring of the vegetation and hydrology of the mitigation area is required for a minimum of 5 years following completion of the wetland mitigation construction and planting. A mitigation monitoring plan will need to be developed in 2005 -2006, and will need to be implemented each year from 2006 through 2011. The Rice Creek Watershed District requires an annual wetland mitigation monitoring report at the end of each growing season during this 5 -year period following the initial construction of the compensatory wetland mitigation area. The mitigation monitoring report should include all data required under the Minnesota Wetland Conservation Act rules, such as monitoring of vegetation establishment, wetland hydrology, soils, and representative photographs from fixed photo - reference points, and any problems associated with the establishment of vegetation and hydrology as specified in the wetland mitigation plan. Foxborough Conservation Development Restoration and Management Plan 30 • • •