07/29/2009 Env Bd Packet - Laserfiche WebLink

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• • RCWD Permit Number 09 -048 have either a sod or vegetated strip around the perimeter of the basin that will serve as pretreatment and the submitted hydrologic calculations show that the 2.3 -inch rainfall event will drawdown within 48 hours. A RCWD Better Site Design worksheet has been provided by the applicant addressing the techniques of Better Site Design complying with RMP -3 8(b). The applicant has provided rate control analysis for the existing and proposed conditions. The submitted hydrologic modeling provides verification of compliance with Rule C.6. 3. Wetlands — The proposed project does not impact any wetlands. The wetlands of the site were delineated and approved under the previous project RCWD File # 03 -073. RCWD staff find the original delineation represents the wetlands of the site. The parcel is located in the landscape level Wetland Preservation Corridor and was further delineated at the site level. The applicant must record a declaration establishing the vegetated buffer and final Wetland Preservation Corridor and other wetland buffer and upland habitat as a part of a permit. The applicant must provide a vegetation management plan for District approval of the buffer area. 4. Floodplain — The proposed project does not impact the regulatory floodplain. 5. Erosion Control — The project proposes 3 methods of erosion and sediment control. They include silt fence, routine street sweeping, and rock construction entrance. These methods comply with RCWD standards. An NPDES Permit is required due to the disturbance of greater than 1 acre of land. As noted in the Recommendations Section, the applicant must identify the use of inlet protection on the plans. 6. Documenting Easements and Maintenance Obligations — Applicant needs to provide drainage and flowage easements, draft maintenance declaration, and receipt showing recordation once approved. 7. Previous Permit Information — Permit 03 -073 approved the existing site development. The permit approved the stormwater treatment. An Environmental Assessment Worksheet (EAW) was done at that time and included the current expansion proposal in the initial plans found in the EAW. The permit also involved the realignment of Anoka County Ditch 72 Branch 1. An easement was provided over the realigned section of the ditch. The applicant also provided a 14± acre conservation easement to the District I hereby certify that this plan, specification or report was prepared by me or under my direct supervision and that 1 am a duly Registered Professional Engineer under the laws of the state of Minnesota. Brent Johnson MN Reg. No 20378 oseph Lewis MN Reg. No 46215 r7 4, -Lo Houston Engineering Inc Page 4 of 4 7/16/2009