PERMFILE129975

• Permit No: C1980005
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: TAB 09 ATTACHMENT 9-6 SOIL BASELINE STUDY EAST WADGE EXTENSION AREA
• Media Type: D
• Archive: No

ADDENDUM 9-6-2 (Cont.)
So11 Interpretations
FOOTNOTES
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6 Available Water Holding Capacity (RWHC): the relative amount of water that a soil, from 0-60 inches or to a parallth is or lithic contact, can hold
available for use by plants. Affected by such cha racteristlcs as soil texture, depth, structure, salts, and organic matter. AWHC modifiers are
site-speclf is for the sampled soil profiles. Class cri terla is taken from USDA-SCS (May 1981), Wyoming So11 Interpretation Procedure Guide, p. 31 and SCS
(1981), Soil Survey Manual, p. 4-33. Classes are: Very Low: 0-3 inches; Low: 3-fi inches; Moderate: 6-9 inches; High: greater than 9 inches.
7 Rate of Runoff: This indicates the relative rate that water is removed by flow over the surface of the soil. Classes are defined in the SCS (1981), Soil
Survey Manual. p. 4-34 and 4-35.
8 Typical Reaction Class: narrative range of pH of surface (A horizon)/subsoil (B horizon, or if B 1s lacking, the first L horizon).
Extremely acid: less than 4.5; very (V) strongly (S t) acid: 4.5-5.0; strongly acid: 5.1-5.5; medium acid: 5.6-fi.0; Slightly (Sit) Acid: 6.1-fi.5; Neutral:
6.6-7.3; Mildly (Mild) Alkaline (Alk): 7.4-7.8; Moderately Alkaline: 7.9-8.4; Strongly Alkaline: 8.5-9.0; Yery Strongly Alkaline: greater than 9.0
Soils that are mildly alkaline usually are calcareous. So cis of moderate alkalinity or stronger are assumed to be calcareous. Strongly alkaline soils have
increased sodium concentrations.
9 Wind Erodibility Group: This is an arbftra ry grouping of soils based on texture and aggregation. Values range from 1 to B, with lower numbers ind lcating
increased susceptibility to riind erosion. The N1nd Erodibility Group classification is far the surface layer only, but could be applied to any layer wf th in
a soil profile. Classes are defined in the USDA-SCS (July 1983) National Soils Handbook, p. 603-31, and USDA-SCS, (May 1981), Wyoming Soil Interpretation
Procedure Guide. ~D• 35.
WEG Soil Te zture of Surface Layer
Very High Erodibility 1 Very fine sand, fine sand, sand, or coarse sand
2 Loamy very fine sand, loamy fine sand, loamy coarse sand
High Erodibility (H) ~ 3 Very fine sandy loam, fine sandy loam, sandy loam, or coarse sandy loam
4 Clay, silty Clay, noncaltareous clay ldam, or silty clay loam with more than 35 percent clay content
4L Calcareous loam and silt loam, or calcareous clay loam, and silty clay loam
Medium Erad ibility (M) 5 Nonca lcareous loam and silt loam with less than 20 percent clay content, sandy clay loam, or sandy clay
6 Noncalcareous loam and silt loam with more than 20 percent clay content, or noncaltareous clay loam with less than
35 pe rc~ent clay content
Low Erodibility (L) 7 Silt, noncaltareous silty clay loam with less than 35 percent clay Content
8 Sails not suitable for cultivation due to coarse fragments or wetness, wind erosion not a problem