2010-05-07_PERMIT FILE - C2009087 ‎(14)‎

• Permit No: C2009087
• IBM Index Class Name: Permit File
• Doc Date: 5/7/2010
• Doc Name: Soils Information
• Section_Exhibit Name: Exhibit 2.04.9-E1 Soils Information
• Media Type: D
• Archive: No

• 3.2 Soil Map Unit Descriptions for Non - Affected Areas
As stated above, the soils data -base for the non - affected areas (approximately 10,000
acres) of the Soils Study Area is the Order 2 Routt County soil survey (NRCS, 2008).
Twenty soil series were mapped in thirty -six map units along with three additional
miscellaneous area map units. Two soil description tables have been compiled to present
this information.
Table 1 (Soil Map Unit Characteristics) includes: (1) Map Unit Number and Name, (2)
Recommended Soil Salvage Depth, (3) abbreviated Soil Profile Description, (4) Slopes and
Terrain, (5) Parent Material Type, (6) Land Capability Class, (7) Range/Woodland Site, and
(8) Acres and Percent of Total Area. Recommended soil salvage depths were determined
by Jim Nyenhuis based on an evaluation of all relevant soils information and are given in
case an area is later proposed to be surface - affected.
Table 2 (Soil Interpretations) includes: (1) Soil Series Name and Map Units in which it is
a major component, (2) Texture of the Particle -Size Control Section, (3) Soil Depth Class,
(4) Effective Rooting Depth, (5) Internal Drainage and Permeability, (6) Available Water
Holding Capacity, (7) Rate of Surface Runoff, (8) Typical Reaction Class, (9) Erosion
Factors including Wind Erodibility Group, Water Erosion Hazard, and Erosion Potential "K"
Factor, (10) Hydrologic Group, and (10) Thickness of "A" Horizon Surface Layer.
Extensive footnote information describes these soil interpretation parameters.
• 3.3 Soil Map Unit Descriptions and Recommended Salvage Depths for Potential
and Proposed Surface- Affected Areas
Table 3 (Soil Map Unit Legend, Salvage Depths, Sample Sites, and Information)
presents information for soils mapped in areas of proposed or potential surface
disturbance, both within and adjacent to the Seneca II Mine permit area, and also along the
potential transportation corridor. These areas also include the potential waste rock
disposal area, the primary mine portal area, several additional mine portal /pothole
excavation areas, the transportation corridor hilly ridge "gap" area adjacent to the south
end of the Seneca II Mine permit area and its extension south to the Foidel Creek Mine
area.
Information presented in the table includes: (1) Map Unit Symbol and Name, (2) the
recommended soil salvage depth for the map unit as a whole, (3) sample site numbers for
the new soil sampling, and (4) the source of additional descriptive information for the
various map units — SII (Seneca II), EW (Seneca II Mine East Wadge Extension Area), Y
(toast), FC (Foidel Creek Mine), SC (Sage Creek), or NRCS (Order 2 Routt County soil
survey). Detailed Order 1 map unit and soil profile descriptions, soil sample sites, and
salvage depth information is contained in the baseline soil reports for the currently
permitted areas (Seneca II Mine - SCC, 1997; Foidel Creek Mine - TCC, 1979 and 1999).
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