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Baseline Survey of Soil Resources - Collom Mining Area July, 2006 <br />Grimm (variant) Gravelly Loam <br />The Grimm series consists of shallow to moderately deep, somewhat excessively-drained soils that <br />formed in residuum and colluvium derived from sandstone and siltstone. This series occurs to a very <br />limited extent in the Survey Area and is generally found in association with sandstone residuum and <br />outcrop. This series is not representative of the typical Grimm series. due to the shallow depth to <br />bedrock. The primary limitations of this series are the shallow depth to bedrock and high coarse fragment <br />content. <br />Havre Clay Loam <br />The Havre series consists of very deep, well-drained soils that formed in stratified, loamy alluvium. These <br />soils are on flood plains, alluvial fans and stream terraces located in the drainage bottoms of the northern <br />portion of the Survey Area. While these soils are variable, most support good grass growth and are <br />expected to be good for use in reclamation. The use of these soils is limited by their minimal development <br />and the variable nature of their stratified subsurface materials. The nutrient content of these soils is <br />variable and dependent on the origin of the stratified deposits. These soils are comparable to, and closely <br />associated with, the slightly drier Battlement series. <br />Jerry Loam <br />The Jerry series consists of moderately deep, well-drained soils that formed from colluvium and alluvium <br />on steep slopes in the southern end of the Survey Area., These soils are generally not as deep as the <br />typical Jerry series. The primary limiting factors are the high clay content (over 35 percent) and high <br />coarse fragment content (from 20 to over 35 percent) of the deeper subsoil. This soil is commonly found <br />in association with the Thornburgh and Cochetopa series and has similar characteristics. <br />Lamphier Loam <br />The Lamphier series consists of very deep, well-drained soils that formed in a mixture of loess, alluvium <br />and colluvium derived from sedimentary rocks. The soils are found on concave slopes, valley headwaters, <br />and in drainageways in the southern portion of the Survey Area. The loamy texture of this soil is very <br />lie conducive to plant growth. Although the tested soils revealed only moderate nutrient content, this soil <br />was observed to be the most productive of the Survey Area. The primary limitations for use are the <br />instability (sloughing commonly observed) and erodibilty of the soil. <br />The variation in the depth of loess and related alluvial and colluvial accumulation is notable in the Survey <br />Area. In the higher topographic positions the depth of accumulation is 16 to 20 inches. However, this <br />rapidly increases (accumulates) in downslope positions where organic stained materials are found at <br />depths well over 72 inches below ground surface. <br />Maudlin Loam <br />The Maudlin series consists of moderately deep, well-drained soils formed in residuum derived from <br />sandstone. Maudlin soils are on plateaus and ridge tops throughout the Survey Area. Loess influence can <br />be identified in some of the profiles and may account for the fine-loamy textural classification of several <br />profiles. The primary limiting characteristics of this series are the bedrock and high coarse fragment <br />content (often over 35 percent) commonly found in the subsoil below a depth of 25 inches. The finer <br />textured Nortez series is very similar and is likely found in association with Maudlin. <br />Morapos Loam <br />The Morapos series consists of very deep, well-drained soils that formed in slope alluvium and residuum, <br />derived primarily from shale and siltstone, with notable influence by loess. The Morapos soils are located <br />primarily in shallow drainages, swales, and other relatively low-lying areas on the tops of the plateaus in <br />the center of the Survey Area. The primary limiting characteristic is the high clay content (commonly 40 <br />to 60 percent) and free carbonates found deep in the subsoil. Profiles with thick topsoil are common and <br />those with Mollic epipedons exceeding 16 inches (Pachic) are included as taxadjuncts. <br />• <br />Tetra Tech, Inc.