5.1. SR 09-07-2004 - Laserfiche WebLink

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Page 2 Mr. Steve Rohlf March 29, 2004 · Jurisdictional Wetland Identification and Wetland Delineation for Proposed Schmidt Gravel Mine, Elk River, Minnesota, prepared by Liesch Associates, Inc., dated May 2003. · Memo to file from Leon Zeug, Liesch Associates, Inc., RE: Sediment Pond Design, Schmidt Gravel, dated May 15, 2003. · Plan Sheet 1 of 2 - Existing Conditions, Property Boundary, Watershed Boundaries and Wetlands Map, and Plan Sheet 2 of 2 - Development Phasing Plan and Details, Schmidt Gravel Mine, Elk River, Minnesota, prepared by Liesch Associates, Inc., dated May 2003. Description of Pro}ect Schmidt Gravel is proposing to mine an additional area, Phase 4, located on the eastern portion of the Property, east of Phase 1 (see Plan Sheet A). Phase 4 consists of approximately 5.5 acres. Approximately 94,000 cubic yards of material will be removed. Mining of Phase 4 is proposed to be conducted from Phase 1 to up to the boundary of the adjacent wetland Area E to the east. Two soil borings (iA and 2A) were completed in the area of Phase 4 on November 19, 2003. The locations of the borings are indicated on Figure 2. The boring logs 'indicate that soils in that area of Phase 4 consist of poorly graded sand with silt and gravel. Water levels were measured at the time of drilling however; it is not believed that they represent the actual water level. The boring logs are attached to this letter. Mining is proposed to be conducted to 15 feet below the water table or to an elevation of approximately 933 feet. It is anticipated that Phase 4 will ultimately produce 3.5 acres of Type 5 wetland (see Plan Sheet A). In the process, two small wetlands, Area F (0.10 acres) and Area G (0.09 acres), as shown on Figure 2, are located within the proposed Phase 4 and would be removed. These wetlands are um-egulated due to their small size. The perimeter of the newly created wetland will be properly seeded upon completion. Due to the elevation of the water table in the area of the project (approximately 948-950 feet, based on information provided in the Environmental Assessment Worksheet prepared for the Property) it is not believed that mining of Phase 4 will significantly impact wetland Area E, as Area E is expected to be a gound water influenced wetland (elevation approximately 948 feet). Upon completion of mining activities, it is anticipated that a natural transition between the boundary of wetland Area E and the newly created Class 5 wetland of Phase 4 will occur. A "Part 1: Basic Application, Minnesota Local/State/Federal Application Form for Water/Wetland Projects" as required by the City, is included with the Application. Mining below the water table will be conducted using a drag line. No dewatering will be conducted at the site at any time. Drainage from Phase 4 will be directed to the open hole during mining (see Plan Sheet A). The Property is currently operating under' a National Pollutant Discharge Elimination System (NPDES) Permit MNG490000 and a Storm Water Pollution Prevention Plan (SWPPP) and will continue to do so during Phase 4 mining. 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/hay bales, rip-rap placement in drainageways, and phased topsoil replacement and seeding of completed phases. Silt fence/hay bales and rip-rap will be placed in areas deemed necessary during mining operations. The SWPPP has been t/pdated to include Phase 4 and is included with the Application. THE LIESCH COMPANIES MINNEAPOLIS, MN MADISON, WI SCO'fq'SDALE, AZ