2009-04-29_PERMIT FILE - C1982056 (4)

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Western Mining District 18-Left Shaft Site Baseline Soil Investigation • RANGE IN CHARACTERISTICS: Soil moisture regime: ustic. However, it occurs on a flood plain and receives additional moisture from endosaturation. Mean annual soil temperature: 39 to 44 degrees F. Mean annual summer soil temperature: 45 to 50 degrees F. Thickness of the mollic epipedon: 24 to 55 inches Linear extensibility (estimated): 6.0 to 8.0 cm Depth to calcic horizon: 20 to 40 inches Depth to redox concentrations: 30 to 40 inches to masses of iron accumulation Water table: depth is 2.5 to 3.5 feet, kind is apparent, months are April to June and usually 3.5 feet to 5 feet the remainder of the year. Particle-size control section (weighted average): Clay content: 35 to 45 percent A horizon: Value: 2 to 4 dry, 2 or 3 moist Chroma: 1 to 3 dry or moist Reaction: neutral or slightly alkaline Bw horizon: Value: 3 to 5 dry, 2 or 3 moist Chroma: 2 or 3 dry or moist • Texture: SICL, CL, SIC, C Clay content: 35 to 45 percent Reaction: neutral or slightly alkaline Bk horizon: Hue: IOYR to 5Y Value: 4 to 7 dry, 3 to 6 moist Chroma: 2 to 6 dry or moist Texture: SICL, CL, SIC, C Clay content: 35 to 45 percent Calcium carbonate equivalent: 15 to 40 percent Reaction: slightly alkaline or moderately alkaline COMPETING SERIES: There are no competing series. The series in a closely related family are Chubbflat, Clover Sprites, and Polich. Chubbflat, Clover Springs, and Polich have fine-silty particle-size control sections. GEOGRAPHIC SETTING: Parent material: alluvium derived from shale. Landform: flood plains. Slopes: 0 to 3 percent Elevation: 6,500 to 8,000 feet Mean annual air temperature: 37 to 40 degrees F. Mean annual precipitation: 18 to 25 inches. 0 Habitat Management, Inc. A3-4 01/15/2009