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Baseline Survey of Soil Resources - Collom Mining Area July, 2006 <br />Nortez Loam <br />The Nortez series consists of moderately deep, well-drained soils that formed from loess deposited over <br />alluvial and residual materials originating from sedimentary rocks. Sandstone and siltstone bedrock is <br />found at depths ranging from 20 to 40 inches below ground surface. The primary limiting characteristics of <br />this soil are the shallow depth to bedrock and high coarse fragment content (usually over 35 percent) <br />found deep in the subsoil. The coarser textured Maudlin series is very similar and is likely found in <br />association with Nortez. <br />Northwater Loam <br />The Northwater series consists of deep, well-drained soils formed in loess and colluvial material derived <br />from sedimentary rocks. This series occurs in large headwater bowls and other wind sheltered areas in <br />the extreme southern portion of the Survey Area. This soil has very high nutrient content and a very <br />loamy texture comparable to Lamphier, but with a more pronounced argillic horizon deep in the subsoil. <br />The limitations for use include high erodibilty. <br />Owen Creek Loam <br />The Owen Creek series consists of well-drained soils that are moderately deep to shale and sandstone. <br />These soils formed in residuum, alluvium and colluvium weathered from shale, and are found on the tops <br />of plateaus and ridges in the southern portion of the Survey Area. Variants to this series include soils with <br />bedrock within 20 inches of the soil surface (lithic) within skeletal textural families. Taxadjuncts include <br />similar soils with thicker (pachic) epipedons. The characteristics limiting the use of this soil include high <br />clay and coarse fragment contents commonly found in the subsoil. <br />Pinelli Loam <br />The Pinelli series consists of very deep, well-drained soils formed in thick, calcareous alluvium derived <br />from sedimentary rocks. This series is found in association with the slightly coarser textured Forelle <br />series on alluvial fans and gentle slopes in the extreme northern end of the Survey Area. The limiting <br />Ask characteristics of the series are high clay content, free carbonates, and low nutrient content in the subsoil. <br />" Pinridge Clay Loam <br />The Pinridge series consists of very deep, well-drained soils formed in alluvium derived from sedimentary <br />rock. The series primarily occurs on stream terraces and alluvial fans in valley bottoms in the northern <br />portion of the Survey Area. The soil has few limiting characteristics and, while the subsoil lacks notable <br />development, it is generally suitable as a plant growth medium. This soil is found in close association with <br />the 5hawa (non•cumulic Mollisol) and Battlement (Torrifluvent) series. <br />Redthayne Channery-Loam <br />The Redthayne series consists of very deep, well-drained, moderately permeable soils formed in alluvium <br />and colluvium derived from interbedded sandstones and shales. This soil has a weakly developed profile <br />and is commonly found on steep slopes in association with Haplustepts and Typic Haplustolls throughout <br />the Survey Area. The mollic epipedon is likely attributable to the influence of loess and alluvial deposition <br />of eroded topsoil. The primary limiting characteristics of the soil are the weak profile development and <br />abundance of coarse fragments in the subsoil, especially deeper than 20 inches below ground surface. <br />Rhone Loam <br />The Rhone series consists of deep, well-drained soils formed primarily from loess deposits over colluvium <br />derived from interbedded sandstone and siltstone. The Rhone series is found on slopes throughout the <br />southern portion of the Survey Area. In the Survey Area, many of the soils classified as Rhone include <br />variants with extremely high coarse fragment content, including loamy-skeletal phases, but without <br />bedrock content within 40 inches of the soil surface. This soil has very high nutrient contents comparable <br />to other Cryolls in the area. 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 very <br />comparable to the coarser textured Skyway series and is similar to the Lamphier series, which is usually <br />free of coarse fragments within the top 35 inches. <br />• <br />Tetra Tech, Inc.