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Baseline Survey of Soil Resources - Collom Mining Area July, 2006 <br />( Shawa Loam <br />The Shawa series consists of very deep, well- to moderately well-drained soils formed in thick co-alluvial <br />materials derived from sedimentary rocks with loess influence in the upper portion of the profile. The <br />Shawa series is found in upland slopes and swales and on alluvial fans throughout the Survey Area. The <br />series has high nutrient content in the topsoil and a thick epipedon with minimal subsoil development. <br />The primary limiting characteristics of this soil are the less altered materials and coarse fragments found <br />deep in the subsoil. <br />may Fine Sandy Loam <br />The Skyway series consists of moderately deep, well-drained soils that formed from deep, coarse <br />textured loess deposits over siltstone and sandstone colluvium and residuum. This series occurs on wind <br />sheltered surfaces, including; slight swales on near level surfaces, leeward side-slopes, and throughout the <br />southern portion of the Survey Area. Taxadjuncts to this series include similar skeletal soils, which <br />generally do not exceed 50 percent coarse fragments in the top 25 inches. This soil is comparable to the <br />finer textured Rhone series. The primary limiting characteristics of this soil are the high erodibility and <br />high coarse fragment content of the soil, generally below a depth of 20 inches. This soil is lower in <br />nutrient content than most of the other nearby Cryolls. This likely results from the coarser texture with <br />its attendant lower nutrient and moisture holding capacity. <br />Thornburgh Channery Loam <br />The Thornburgh series consists of moderately deep, well-drained soils that formed in colluvium and <br />alluvium derived from sedimentary rocks. The weakly developed Thornburgh soils are found on steep side <br />slopes and toe slopes in the southern portion of the Survey Area. The primary limiting characteristics of <br />this series are low nutrient content, weak development and high coarse fragment content of the subsoil. <br />This soil is lower in nutrient content than most of the other nearby Cryolls. This likely results from the <br />coarser texture and attendant low moisture holding capacity, which allows for leaching of nutrients <br />through the profile. <br />C <br />Tolman Channery Loam <br />The Tolman series consists of well-drained soils that are shallow to hard bedrock. They formed in slope <br />alluvium, colluvium and residuum from sedimentary beds, with many pedons exhibiting notable loess <br />influence. This series is found in a variety of positions on the plateaus in the central portion of the Survey <br />Area. The series is limited by bedrock depths from 10 to 20 inches below ground surface. The generally <br />coarse texture, high coarse fragment content, and shallow depth of this soil varies in response to <br />variations in the sedimentary rocks from which the soil developed. Taxadjuncts to this series include <br />skeletal soils as a notable component of most map units, including Tolman. This series is comparable to <br />the coarser textured Duffymont series, which lacks an argillic horizon. This soil is lower in nutrient <br />content than most of the other. nearby Ustolls. This likely results from the inhospitable conditions and <br />limited plant growth attributed to the shallow depth to bedrock. <br />Vandamore Stony Clay Loam <br />The Vandamore series consists of shallow to moderately deep, well-drained soils formed in material <br />weathered from sandstone. This series is found on wind-swept ridges and steep or convex slopes in the <br />extreme southern portion of the Survey Area. The use of this soil is limited by the extremely high content <br />of coarse fragments within the top 15 inches of the soil surface. The high coarse fragment content and <br />minimal pedon development make the subsoil poorly suited as a plant growth medium. Taxadjuncts with <br />bedrock contact within 20 inches (lithic) are common, but are generally non-limiting due to the nature of <br />the soil. Although no samples were collected from this series, it is assumed to have very low nutrient <br />content. <br />Waybe Clay Loam <br />The Waybe series consists of shallow, well-drained soils that formed in material weathered from clayey <br />shale. This series is found on ridge crests and steep and convex slopes in the southern portion of the <br />Survey Area. This soil is limited by the high clay content and paralithic contact with shale, usually within <br />• <br />Tetra Tech, Inc. 8