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• <br />*_5 <br />BASELINE SURVEY OF SOIL RESOURCES <br />COLLUM MINING AREA <br />MAP UNIT DESCRIPTIONS <br /> <br />i I <br />Map lJnit Slope Pct Components . % Surf Text Topsoil Subsoil Limiting Factors Inclusions Comment <br /> Soils with bedrock contact within 40 inches <br /> Loam & Fine High carbonate content in the (Kemmerer) and variants with high loess influence These soils formed on short slopes in the northern <br />9 10-35 Yamo (Steep Phase) 65 Sandy Loam 6 16 lower subsoil and more rocks at are present. Soils in moist areas have weak end of the project area. <br /> depths over 22 inches. argillic horizon development (Pinelli). All are non- <br /> limiting within the proposed salvage depths. <br /> These soils formed in areas of accumulation such <br /> <br />Loam & Fine High carbonate content and less Soils with argillic horizon development as alluvial fans, terraces, toe slopes, and other <br />gentle topography at the extreme north end of the <br />10 0-20 Yamo 65 Sandy Loam 12 24 altered materials in the lower (Forelle/Pinelli) are present, but non-limiting within study. These soils are in uplands with minimal run- <br /> subsoil. the proposed salvage depths. on moisture, keeping them in the aridic moisture <br /> regime. <br /> High carbonate content or Non-limiting soils without finer textures (Pinelli), These soils are found on old terraces, benches, <br />11 0-20 Forelle 75 Loam 6 15 gravel is often present at depths argillic horizons (Yamo), and those formed in and plains in the northern part of the study area. <br /> beyond 20 inches. slightly more moist areas (Evanot) are found The presence of carbonates readily marks the <br /> within this unit. lower boundary of the most suitable soil. <br /> Forelle v. <br />(Fine-Loamy/Loamy-Skeletal <br />65 Loam & Clay <br />6 <br />8 High rock content and bedrock This map unit is located on shallow slopes of hill <br /> <br />12 <br />0-20 <br />Ustic/Lithic Ha lar ids Loam at shallow depths. Some less limiting deeper soils (Yamo, Pinellie, <br />F <br />ll <br />t crests and ridges at the north end of the project <br /> <br />soil <br />salvage due to rock ore <br />e) are presen <br />. area. The potential for salvage varies considerably <br /> Rock Outcrop / Extremely Shallow 20 co <br />ntent. <br />co depending on bedrock depth. <br /> Poor soil development in all <br /> Lithic / Typic Haplustepts 45 Loam 5 12 profile with unaltered or <br />comparatively poor material This unit primarily occurs on southwest facing <br /> <br />13 <br />0-60 <br />below subsoil depth. <br />Similar Mollisols and Entisols occur in this unit as slopes and hogbacks of northwest facing slopes in <br /> <br />Torriorthents <br />25 <br />Loam <br />4 <br />Little or no soil development, <br />do some weakly developed Aridic Haplustalfs. the northern portion of the survey area. More soil <br />is present on the shallowest slopes and <br /> hi h rock and clay content. <br /> depressions within this unit. <br /> Rock Outcrop / Extremely Shallow 20 No soil salvage due to rock <br /> content. <br /> Typic/Lithic Haplustepts 40 5 12 Minimal soil development with The unit primarily occurs on northwest facing <br /> <br />14 <br />20 60 <br />Loam <br />hi <br />h <br />k <br />d <br />l <br />t <br />t <br />t Torriorthents occur to a limited extent. Rock slopes where minor loess deposits over colluvium <br /> Duffymont & Typic Haplustolls 40 7 12 g <br />roc <br />an <br />c <br />ay con <br />en <br />a <br />depth <br />. outcrop is present in less than 5% of the unit. and greater moisture retention account for the <br /> mollic horizon. <br /> High clay content in the subsoil Non-limiting inclusions are similar Mollic soils This map unit is located on the crests of ridge tops <br /> <br />15 <br />0-20 Campspass v. <br />60 Clay & Clay 6 12 with sandstone and shale at (Maudlin & Nortez) and the typical Campspass and elsewhere in the central portion of the study <br /> (Shallow / Lithic) Loam shallow depths <br />. soils. Rock outcrop is present in as much as 5% area where slopes are shallow and shale weather <br /> of this unit. over residual sandstone. <br /> Non-limiting soils include Mollisols (Morapos) and Thi <br /> <br />Very high clay content in the <br />soils formed in clay over sandstone bedrock (e.g., s map unit is located on very shallow sloping <br />16 0-20 Campspass 80 Clay Loam 6 20 subsoil with additional clay and Nortez) are also present. Small resistant ridge tops in the central portion of the study area. <br /> carbonates at greater depth. sandstone outcrops and Torriorthent inclusions The argillic horizons of this unit are very well <br /> are also present in <5% of the area. developed. <br /> <br />Campspass v. High clay content in the subsoil <br />Non-limiting inclusions are similar Mollic soils <br /> (Shallow / Skeletal) 50 Clay & Clay 6 18 with sandstone and shale at (Maudlin and Duffymont). Some Torriorthents are This unit is quite variable with generally weak <br />17 20-60 L shallow depths. u <br />l <br />t <br />10 <br />ith argillic horizons and shallow depths to unaltered <br /> <br />Haplustepts <br />35 oam <br />4 <br />12 <br />Little or no soil development, <br />a <br />so presen <br />(max <br />/o <br />) w <br />no subsoil available <br />for salvage. <br />parent materials. <br /> high rock and clay content. <br />N:\TYPING\ENV-FAC\5520068\Collum Soil Data\Table B-5 Page 2 of 7