2010-12-30_PERMIT FILE - P2010026 ‎(5)‎

• Permit No: P2010026
• IBM Index Class Name: PERMIT FILE
• Doc Date: 12/30/2010
• Doc Name: New NOI- MP, CONF, Appendix B & C
• From: Shell Frontier Oil and Gas
• To: DRMS
• Email Name: SSS
• Email Name: THM
• Media Type: D
• Archive: No

• TABLAcontinued) •
RD&D LEASE COC-69166
SOIL TINTEMEIA IMINS
8
Typical Reaction Class: narrative range of pH of surface (A horizon)/subsoil (B horizon, or if B is lacking, the first C horizon).
Reaction Description pH Range
Strongly Acid 5.1-5.5
Medium Acid 5.6-6.0
Slightly Acid 6.1-6.5
Neutral 6.6-7.3
Mildly Alkaline 7.4-7.8
Moderately Alkaline 7.9-8.4
Strongly Alkaline 8.5-9.0
Very Strongly Alkaline <9.0
Soils that are mildly alkaline usually are calcareous. Soils of moderate alkalinity or stronger are assumed to be calcareous. Strongly alkaline soils have increased sodium concentrations.
9
Wind Erodibility Group (WEG): This is an arbitrary grouping of soils based on texture and aggregation. Values range from 1 to 8, with lower numbers indicating increased susceptibility
to wind
erosion. The Wind Erodibility Group classification is for the surface layer only, but could be applied to any layer within a soil profile. Class are defined in the National Soils Handbook
(USDA-NRCS
2007).
WEG Soil Texture of Surface Laver
Very High Erodibility 1 Very fine sand, fine sand, sand, or coarse sand (I = 220)*
2 Loamy very fine sand, loamy fine sand, loamy coarse sand (I = 134)
High Erodibility 3 Very fine sandy loam, fine sandy loam, sandy loam, or coarse sandy loam (I = 86)
4 Clay, silty clay, noncalcareous clay loam, or silty clay loam with more than 35 percent clay content (I = 86)
4L Calcareous loam and silt loam, or calcareous clay loam, and silty clay loam (I = 56)
Medium Erodibility 5 Noncalcareous loam and silt loam with less than 20 percent clay content, sandy clay loam, or sandy clay (I = 56)
6 Noncalcareous loam and silt loam with more than 20 percent clay content, or noncalc.clay loam with less than 35 percent clay content (I = 48)
Low Erodibility 7 Silt, noncalcareous silty clay loam with less than 35 percent clay content (I = 38)
8 Soils not suitable for cultivation due to coarse fragments or wetness, wind erosion not a problem (I = )
HEL (Wind) and HEL (Water) status taken from "Highly Erodible Soil Map Unit List (HEL), dated 1/1/90 (NRCS 2001).
* I Factor: This value indicates the relative amount of soil that can be expected to erode, through wind influence, in Tons-Per-Acre-Per-Year (T/AC/YR). It is related to the wind erodibility
group
number and the percent of dry soil aggregates >0.84 mm in diameter.
10
Water Erosion Hazard: taken from Soil Survey of Rio Blanco County (Tripp et. al. revised 1992). HEL Water list (NRCS 2001). Water erosion hazard rating includes many factors including
the
surface soil, precipitation, length, and steepness of slope.
u
K Factor: This value indicates the relative susceptibility of a surface soil to water erosion. Values may range from 0.00 to 0.70. Higher K values indicate higher erosion susceptibility.
Soils with K
factor over about 0.40 are generally considered to be highly susceptible to water erosion. It should be noted that the K factor is derived primarily from physical characteristics of
the soil, and does not
reflect other soil erosion factors such as management practices, precipitation, or length and steepness of slope.
Erodibility Potential "K" Value
Low Erodibility 0.20 or less
Moderate Erodibility 0.21 to 0.40
High Erodibility >0.40
20