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Western Mining District 18-Left Shaft Site Baseline Soil Investigation <br />• Table 1. <br />Twentymile Coal Company <br />Western Mining District <br />18-Left Shaft Soil Descriptions <br />Soil <br />Core Soil Map <br />Unit A-Horizon <br />Depth B- Horizon <br />Depth <br />1 Binco-D10 7 25 <br />2 Binco-C10 7 18 <br />3 Binco-D10 7 24 <br />4 Binco-C10 6 28 <br />5 Elkhead-110 16 44 <br />6 Elkhead-110 14 43 <br />RECOMMENDATIONS <br />Soil core descriptions, surface vegetation, and topographic relief suggest that <br />approximately 45.8 acres of the ventilation shaft pad are located on a suitable upland <br />Binco soil series. The areas mapped as Elkhead clay loam, 0-5% (2.5 acres) and saline <br />. seep soils (1.2 acres) are located along the far southern boundary of the ventilation shaft <br />pad and immediately adjacent to an intermittent drainage channel. These soils along <br />north side of the intermittent channel have the potential for flooding during extreme <br />precipitation events. Disturbance above this intermittent channel will require <br />appropriate BMP's to minimize erosion and sedimentation outside of the development <br />area. <br />• <br />Habitat Management, Inc. 3 <br />01/12/2009