2010-12-17_REVISION - C1981019 (142)

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Baseline Survey of Soil Resources - Collom Mining Area July, 2006 15 inches of the soil surface. Although no samples were collected from this series, it is assumed to have very low nutrient content. Weed Loam The Weed series consists of very deep, well-drained soils formed in alluvium and residuum derived from sandstone and interbedded sandstone and shale. Soils of this series are located in swales and other relatively low lying water and wind depositional areas in the northern portion of the Survey Area. The surface horizons of this soil are heavily influenced by loess deposits, similar to other soils in the area. This soil has few limiting characteristics, with a thick topsoil horizon and suitable subsoil below. Salvage depths are generally limited to depths above 40 inches, where carbonates and higher rock content usually occur. Yamo Fine Sandy Loam The Yamo series consists of moderately deep to very deep, well-drained soils that formed in colluvium, alluvium, and residuum. This series is found on ridges and steep slopes in the extreme northern portion of the Survey Area. The Yamo soils are limited by their very low nutrient content throughout the profile, and their high carbonate content generally beginning 20 inches below ground surface. The nutrient contents of this soil were the lowest of all soils sampled. This is largely attributed to the arid climate and relatively low plant biomass relative to other nearby Aridisols. Other soils Other soils similar to those named series were encountered and described throughout the Survey Area. Where these soils are a major component of a map unit, the attendant map unit description identifies the limiting characteristics of this component. Representative profiles can be found by comparing the unit name to the taxonomic classification of the pedons described in the survey area and presented elsewhere in this report. For reference, all lithic components have bedrock within 20 inches of the soil surface and skeletal soils generally have more than 35 percent coarse fragment content within 10 to 40 inches of the soil surface. Non-named primary map unit components, general information about the soil, and potentially similar series for reference follow. • Haplocryalfs - soils generally with high clay content and frequently high coarse fragment content in the subsoil. See: Campspass, Waybe, and Vandamore. • Haplocryepts - soils with a cryic temperature regime and minimal subsoil development. See: Campspass, Waybe, and Vandamore. Ustifluventic Haplocambids - Soils in an aridic moisture regime that are heavily influenced by alluvial deposits that have limited subsoil horizon development. See: Battlement and Havre. • Fluventic Haplustolls - Soils with a dark surface layer in an ustic moisture regime that are heavily influenced by frequent alluvial depositional episodes that have limited subsoil horizon development. See: Redthayne and Battlement. • Lithic Haplocryoll - very similar to the Duffymont series, but with a Cryic temperature regime. • Ustic Haplocambids - Minimal soil development in an aridic moisture regime. See: Yamo, Forelle, and Pinelli. • Entisols - soils with a variety of moisture and temperature regimes but very little, if any, subsoil development. Most of these soils have six inches, or less, material available for salvage. • Haplustepts - soils with an ustic temperature regime and minimal subsoil development. See: Waybe, Vandamore, and Danavore. • Aridic Haplustolls - soils with a dark topsoil, but found in a relatively dry moisture regime. See: Redthayne, Kemmerer, and Yamo. Soil Map Unit Development Interpretation of aerial photography, satellite imagery, topographic maps, and a hillshade model of the Survey Area, in combination with field observations and preliminary map unit designations made during the field effort, resulted in development of final map units of soil types within the Survey Area. Within the Order II Survey Area, these units were identified as consociations, where possible, and complexes where the pattern of the soil distribution could not be identified with the data available. More associations were Tetra Tech, Inc.