07/29/2009 Env Bd Packet - Laserfiche WebLink

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• • • Natural Heritage ranking of C or better or reestablishment of Native Prairie, woodlands or forest. Because the area meets these requirements, 0.85 inches of depth over the area will be given to meeting the 0.5 inch volume requirement when using the restored upland area. The results are the need for a 1.5 acre upland conservation area to meet the RMP -3 requirements. The Applicant will than convey the 1.05 acres to conservation to meet the RMP -3( c )b requirement.. According to the Findings of the RCWD, the applicant proposes to treat the runoff for the new impervious area created by two new bio- filtration basins adjacent to the new parking area. See (Attachment 6). The two new bio- filtration basins were designed to treat the volume from a 2.3- inch rainfall meeting the requirements of RMP -3 b (i). Also, rules C.8(a)(1) and C.8(a)(2) require pretreatment and limit the drawdown time for infiltration basins respectively. The applicant is proposing bio- filtration as the form of treatment and is not required to follow the design requirements in rule C.8(a). The bio- filtration basins will have either sod or a vegetated strip around the perimeter of the basin that will serve as pretreatment and the submitted hydrologic calculations show that the 2.3 -inch storm event will drawdown within 48 hours. The applicant will follow the RCWD Better Site Design worksheet to comply with rule RMP -3 8(b) techniques of better site design requirements. Rate control compliance has been verified and in compliance with rule C.6. Wetlands -- The proposed project does not impact any wetlands. The parcel is located in the landscape level Wetland Preservation Corridor. The applicant must according to the CAPROC, record a declaration establishing the vegetated buffer and upland habitat as part of the permit. The applicant must also submit a management plan for the vegetated buffer and must be approved by the Watershed district approval. Floodplain -- There are no floodplain impacts. National Heritage Issues —There are no National Heritage (threatened and endangered) issues of concern on this site. Erosion Control —An acceptable erosion control plan has been submitted. An NPDES permit must be obtained for this project. The erosion control plan, permits and inspection reports must be located on