8.2. SR 11-07-2016 - Laserfiche WebLink

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Table 10-1 Soil Types Soil Number Soil Name Acres Percent of Percent Complex Composition Site (Stonelake-Sandburn-Minor Components) 1253B Stonelake-Sand burn 44.6 31.5% 60%-30%- 10% Complex, 1 to 6%slopes 1253C Stonelake-Sand burn 47.8 33.7% 65%- 25%- 10% Complex, 6 to 15%slopes 1253E Stonelake-Sandburn 44.7 31.5% 65%-25%- 10% Complex, 15 to 40%slopes 730B Sandburn fine sandy loam, 4.6 3.3% 2 to 6 percent slopes The topography of the Site is irregular, with elevation ranging from 971 to 1049 feet above mean sea level (msl) across the Site. Naturally occurring slopes as steep as 1.5:1 (H:V) are found on the Site. These steep slopes do not present a limitation to Site development as a sand and gravel mine as slopes this steep are common to mining operations and reclamation will result in more gradual and stable slopes. Sheet Cl: Existing Conditions, includes topography from Twin Cities Metro region LiDAR data, collected during the spring and fall of 2011. Figure 2, USGS Quad Map Excerpt, illustrates the topography of the Site and surrounding area. The proposed area of soil excavation (mining) is 119 acres, with the remaining area of the Site utilized as setback, buffer and right of way areas. The estimated volume of soil excavation associated is approximately 16 million cubic yards. This includes topsoil and overburden as well as the sand and gravel deposit both above and below the water table. A portion of the deposit may not be suitable for aggregate uses and will remain at the Site and used for reclamation. Additional material may be imported to the Site and used for reclamation. Typically the imported fill will come from a grading project with excess soils. Aggregates will be delivered to the jobsite and the excess soils will be backhauled to the mine site. Material used to backfill created waterbodies will be granular in nature to allow suitable compaction where future development is planned. In the future Baldwin St. NW and 225th Ave. NW may be lowered along common mining borders which would result in additional material to be excavated. NOTE: For silica sand projects, the EAW must include a hydrogeologic investigation assessing the potential groundwater and surface water effects and geologic conditions that could create an increased risk of potentially significant effects on groundwater and surface water. Descriptions of water resources and potential effects from the project in EAW Item 11 must be consistent with the geology, soils and topography/land forms and potential effects described in EAW Item 10. Environmental Assessment Worksheet Page 12 Elk River Sand and Gravel Mines:Tiller Corporation and Max Steininger, Inc.