2010-12-17_REVISION - C1981019 (156)

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T#5 BASELINE SURVEY OF SOIL RESOURCES COLLUM MINING AREA MAP UNIT DESCRIPTIONS Map Unrt Slope Pct. - Components % Surf Text Topsoil Subsoif Limiting Factors Inclusions Comment' Steep eroded slopes along This map unit occurs along the lower wet portions Fluvaquents 60 narrow wet (saturated) channels of the major drainages in the project area. The uni 1 0 10 l f al li it t nti r a Eroded remnants of Shawa Pinrid e and Yamo receives eriodic moisture from runoff events and - var. m po e a o s v ge. , g , . p Battlement 40 Depths and textures of materials seasonal/perennial moisture from up channel vary. springs. Erosion is active. Gravelly-L & The soils of this unit are very This unit is primarily present on very steep slopes Lithic/Ustic Torriorthents 60 L 6 0 poorly developed with unaltered inceptisols and alfisols Inclusions Some similar and topography with hard bedrock. Soils are very 2 0-75 oam material at shallow depths. . are non-limiting. poor relative to most other units. Many of the slo es have boulders that will further limit salva e Bedrock Outcrop 30 salvage due to rock p g operations. content. co The soils of this unit are very Lithic/Ustic Torriorthents 45 a 6 0 poorly developed with unaltered L Loam m & & material at shallow depths. This unit is primarily present on very steep slopes with ver minimal soil develo Soils are ver ment 3 25-75 Loam Minimal soil development with Few inclusions. y p . y Fine-Loamy /Loamy-Skeletal 30 5 6 high rock and clay content at relative to most other units. Outcrops poor occur Typic Haplustepts depth. as ledges. Rock Outcrop / 20 No soil salvage due to rock Extreme) Shallow content. Ridge tops on the south end, loess pockets and 4 0 35 Entisols 45 Loam 4 0 Hi h rock content at de th Rock outcrop (-5%), Torriorthents (-10%), and areas of more soil development. Argillic horizons - g p occasional mollisol pockets. of alfisols are weak and border on cambic Haplocryalfs/Haplocryepts 35 Loam 10 10 (Haplocryepts). Ustifluventic Haplocambids 45 Loam Terraces and alluvial fans of canyons in north end 5 10 0 8 15 Weak rofile develo ment Other similar soils of study area. The soils in this unit are all very - p p . comparable, but highly variable in texture and the Battlement / Havre 45 Loam nature of the stratified deposits. Shallow / Skeletal 50 These poorly developed soils Skeletal phases of the primary soils and similar, These poorly developed soils are generally on Ustic Haplocambids have high clay content and weakly developed soils, are present. Some argillic steep slopes and ridge tops at the north end of the 6 0-70 Loam 6 var. coarse fragments at depths (Haplargids) soils are likely found in areas of project area. Variable geology results in variable Torriorthents 25 below 6 inches. moisture accumulation. Rock Outcrop occurs subsoil conditions. across approximately 15% of the unit. Redthayne/Yamo v. Some loess and more altered Unit is variable and inclusions are similar. This unit is primarily located in the Order III survey 7 10-70 (Fine-Loamy/Loamy-Skeletal Ustic 75 Loam 6 12 materials above shale and Translocated clays and carbonates may or may area. Many of the slopes are very steep. The soil sandstone colluvium in subsoil. not be present in the subsoil. Lithic soils may moisture regime is borderline between ustic and Hapocambids/Haplargids) Less alteration below 18 inches. occur in approximately 15% of the unit. aridic. Thin topsoil over thick subsoil This unit is formed from outwash materials Loam & Fine with high gravel content. Higher Similar deeper soils (Yamo) and soils with argillic F ll lik l i deposited over interbedded 8 0-20 Kemmerer 80 Sandy Loam 6 24 carbonate content or less ore e) are y present, but are non- hor zons ( e sandstone/siltstone/shale on ridge tops. Subsoil is alteration below 30 inches. limiting. variable, but generally of poor quality. Bedrock is generally present within 40 inches. N:\TYPING\ENV-FAC\5520068\Collum Soil Data\Table B-5 Page 1 of 7