5.4. PCSR 05-13-2008 - Laserfiche WebLink

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Page 3 June 8, 2004 WTEP meeting with water levels recorded in feet NGVD for four rounds of water level observations. Mining is proposed to be conducted to 45 feet below the water table or to an elevation of approximately 900 feet at the deepest point of mining. It is anticipated that the mining will ultimately result in approximately 10 acres of Type 5 wetland being created where there is currenfly type 2 wetland with reed canary grass making up the dominant vegetation {refer to Plan Sheet 2). in the process, one small wetland, Area C (0.43 acres -impact area. 2) on the north side of the site, a portion of wetland Area B (1.10 acres -impact area 3) and a portion of wetland Area A (0.51 acres - impact area 1 } are located within the proposed mining area and would be excavated (Impacted). Anderson Engineering of Minnesota, LLC is submitting a wetland application and replacement plan for the impacted wetlands under separate cover which outlines the on-site mitigation activities required to replace the impacted wetlands at the site. .Due to the elevation of the water table in the area of the project {approximately 944-945 feet, based on existing hydrogeologic data. for the region and observations of the on-site monitoring wells) it is not believed that mining of the property will significantly impact the existing wetlands on site. The results of the topographic survey mapping and observed water table elevations support the opinion that these wetlands have hydrology that is supported primarily by groundwater. In addition, the soil borings completed at the site did not indicate the presence of a significant low permeability soil layer that would lead to perched shallow water table conditions m the azea. Mining below the water table is proposed to be eonductecl using a drag line. No dewatering will be conducted at the site at any time. Drainage from mining area will be directed to the open areas created during mining. (Refer to Plan Sheet 3}. J & B Mining will apply for coverage under a National Pollutant Discharge Elimination System (NPDES) Pemmit MNG490000 and a Storm Water Pollution Prevention Plan {SWPPP) has been prepared and is included with the CUP submittal package. As indicated in the SWPPP, surface water runoff and erosion controls are proposed to control surface water discharge off site. The proposed. controls will include installation of silt fence and/or vegetative buffers, hay bales, rip-rap placeme~ in drainage ways, and phased topsoil replacement and seeding of completed mining areas. Silt fence/vegetative buffers, hay bales andrip- rap will be placed in areas deemed necessary during mining operations. The SWPPP also includes discussion of Best Management Practices {BMP's) to be utilized during mining operations. The Honed gravel material will be hauled primarily to EIk River Bituminous located approximately lf4-mile southwest of the Property using a private access road_ Mining operations be conducted between the hours of 7:00 AM and 7:00 PM as required by the City of Elk River. Vau-iance Reouest In conjunction with the Conditional Use pemait application the applicant requests a variance to allow mining activities within five feet of the property line instead of 40 feet as required in Section 16 of the Sherburne County Zoning Ordinance. Slopes within the 40 foot area of the property line are proposed to be no greater than 4:1. The reduced setback is requested to allow for connection of the open water area with that on the Schmidt Mining azea to make open water area. suitable for the proposed shared fisheries habitat that will cross the property line, The applicant believes that this