2010-12-17_REVISION - C1981019 (156)

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T-5 BASELINE SURVEY OF SOIL RESOURCES COLLUM MINING AREA MAP UNIT DESCRIPTIONS MapjUnit slope.Pct. ' Components % Surf Text I Topsoil Subsoil Limiting Factors Inclusions Comment Maudlin v. 35 Loam 12 12 High rock content in the subsoil (Fine-Loamy/Loamy Skeletal) and below. Non-limiting inclusions present in this unit are These soils form on steep shaded slopes in the skeletal Mollisols (Tolman and Duffymont) and center of the project area where vegetation holds 28 0-50 Campspass v. Loam & Clay High clay content in the subsoil Inceptisols. Entisols are also present and offer a loess/colluvium mixture in relatively moist (Shallow / Lithic) 35 Loam 12 with sandstone and shale very little soil for salvage. environments. colluvium at shallow depths. High rock content in the subsoil This is one of the most northerly of the ustic units Maudlin 55 Loam 8 16 and below. Transitional soils with (Tolman) and without argillic which is located on ridges and benches with a 29 0-10 horizons (Typic Haplustolls). These soils are non north or northeast aspect, which keeps them cool. Some loess influence in the surface accounts for Loam and The subsoil generally has limiting. the Loam texture and lack of coarse fragments Y Du mont ? 25 Channe ry 12 var. extremely high rock content. contrary to other soils in adjacent units. Loam High rock content in the subsoil Typic Haplustolls and Pachic soils (Weed & This unit occurs in the northern portion of the project area on stable surfaces with weathered 30 0-35 Maudlin 75 Loam 8 16 and below. Especially high rock Shawa) are likely present to a limited extent. sandstone and siltstone. Loess influence is noted content in subsoil of steeper Bedrock outcrop occurs in less than 5% of the on the steeper north facing slopes with rocky slopes. unit. colluvium in the subsoil. Loam, Silt Very high clay content, shale, Morapos 60 Loam, & 10 20 and carbonates are present in Where bedrock is present at depths between 20 These soils develop from weathered shale Clay Loam the subsoil and below. and 40 inches Maudlin is present. Soils formed in residuum and colluvium on ridge tops and gentle 31 0-20 clay over sandstone bedrock (e.g., Nortez), small slopes. The beginning of the subsoil is marked by Very high clay content in the resistant sandstone outcrops, and Torriorthent the notable increase in clay content. The argillic Campspass 25 Clay Loam 6 20 subsoil with additional clay and inclusions are also present. horizons of this unit are very well developed. carbonates at greater depth. These soils develop from weathered shale Loam, Silt Very high clay content, shale, Where bedrock is present at depths between 20 residuum and colluvium on ridge tops and gentle 32 0-20 Morapos 70 Loam, & 10 20 and carbonates are present in and 40 inches Maudlin is present. Some soils in slopes. The beginning of the subsoil is marked by Clay Loam the subsoil and below. this unit do not exhibit mollic colors (Campspass). the notable increase in clay content. The argillic horizons of this unit are very well developed. Non-limiting inclusions are more loamy textured This unit is located on ridge tops and formed from 33 0-35 Nortez 65 Loam 8 16 Higher clay content and coarse (Maudlin), deeper (Morapos), and shallower thin loess deposits over shale with sandstone fragments at greater depth. (Owen Creek) Mollisols. Bedrock outcrop is bedrock at depths generally less than 40 inches. present, but occurs in less than 2% of this unit. High clay and rock conterft in This unit is located on ridge tops and swales and Weed 55 Loam 16 24 the subsoil and below. Finer textured soils without a pachic horizon developed from highly weathered shale residuum 0 (Morapos) and soils without an argillic horizon with a notable loess and alluvial influence 34 0-2 (Shawa and Typic Haplustolls) may be present to accounting for loamy textures. Loess influence is High rock content in the subsoil a limited extent. especially notable on the steeper north facing Maudlin 30 Loam 8 16 and below. slopes. Soils without a pachic epipedon (Morapos) and This unit is located on ridge tops and swales and 35 0-20 Weed 70 Loam 16 24 High clay and carbonates are shallower soils (Maudlin) are likely present in this developed from highly weathered shale residuum present deeper in the soil. unit. with a notable loess and alluvial influence accounting for loamy textures. N:\TYPING\ENV-FAC\5520068\Collum Soil Data\Table B-5 Page 4 of 7