2010-12-17_REVISION - C1981019 ‎(156)‎

• Permit No: C1981019
• IBM Index Class Name: REVISION
• Doc Date: 12/17/2010
• Doc Name: Exhibit 9 Item 8 Appendix B Report Tables
• Type & Sequence: PR3
• Email Name: JRS
• Media Type: D
• Archive: No

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BASELINE SURVEY OF SOIL RESOURCES
COLLUM MINING AREA
MAP UNIT DESCRIPTIONS
•
Map Unit Slope-.Pct. Components % Surf Text Topsoil Subsoil Limiting Factors Inclusions Comment
High clay content and shale Soils with horizons not classified as argillic are Loess deposited over shale colluvium dominates

57
0-35
Cochetopa
75 Loam & Silt 20 12 colluvium/residuum in subsoil more appropriately classified as Rhone in this unit. the parent material of this unit. These soils form
Loam and more common at depths These soils are non-limiting. Jerry and Thornburgh on ridges and gentle slopes where weathering has

below 32 inches.
may also be present. formed true argillic horizons in the subsoil (i.e.,
loess-colluvium interface).
High clay content in subsoil and Skeletal phases of the primary soils and skeletal
Cochetopa 45 Clay Loam 16 8 commonly bedrock contact phases of soils with thinner loess deposits This unit occurs primarily on northwest facing
within 40 inches.

High content of rock fragments (Thornburgh v. & Jerry v.) are found in this unit. slopes in the canyons and on wind and sun
58 10-60
and clay/shale in subsoil with Topsoil and subsoil salvage (best material) may sheltered slopes in the extreme south end of the

Rhone
35 Loam & Clay 18 12
residuum and unaltered be limited to 6 and 12 inches, respectively. Soils study area where loess has accumulated over
Loam
colluvium at depths from 30-40 without an argillic horizon and bedrock contact colluvial and residual shale and sandstone.

inches. (Skyway) are also present.

Loam & Silt Subsoil has higher rock and clay Soils with less coarse fragments (Cochetopa) and Most soils in this unit are deep and are largely
59 4-50 Northwater 65
Loam 24 12 content, but is frequently high shallower depth to bedrock (Skyway & Rhone) are comprised of loess deposits over colluvium and

quality.
present, but are non-limiting within 36 inches. residuum. Pockets of the thickest loess deposits
would allow for salvage of 60+ inches of soil.
60 Landsli de: Mixed components with limited potential for salvage.
61 Areas disturbed at the time of the survey, not including recent drill pads or roads.
62 0-6 Hydric soil s and some Orthents - More detail collected as part of wetland surveys.
Legend: Map Unit: As presented on Soil Survey Maps Appendix D of this document
Components: Soil Series or Textural Family classification level
% = Percent composition of map unit
Surface Texture = Predominant surface texture
Topsoil = Typical salvage thickness of topsoil horizons
Subsoil = Typical salvage thickness of subsoil horizons
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