2009-08-25_PERMIT FILE - C1991078

• Permit No: C1991078
• IBM Index Class Name: Permit File
• Doc Date: 8/25/2009
• Section_Exhibit Name: 2.04 Environmental Resources
• Media Type: D
• Archive: No

• 2.04.9 SOILS RESOURCE INFORMATION
(1) The Applicant performed a site specific soil survey of
the permit and adjacent area during November 1990 and June 1992.
The purpose of the survey was to refine the soils resource
information which is available from the U.S. Soils Conservation
Service, (SCS). The June 1992 survey encompassed the area to be
disturbed by mining area number 3.
(a) The dominant soils within the permit area that will
be disturbed by mining operations are the Barx series, Progresso
loam, and Pinon loam. Small areas of the Paradox series occur in
the bottom of the drainages. Soils throughout the area are
predominantly medium textured moderate to well drained, slight to
moderately alkaline, developed in both residuum and alluvium
derived from sandstone and shale. Depths vary from shallow, less
than 10 inches, to deep, greater than 36 inches in depth. Normal
topsoil salvage operations will include the A, B, and C horizons.
However, should on site inspection during salvage operations
determine that any part or all of the C horizon is not suitable as
a plant growth medium, the unsuitable material will not be salvaged
for topsoil material. Following is a discussion of each of the
soil types that are within and adjacent to the permit area.
Soil Map Unit No. 1
• Barx fine sandy loam, 1 to 3 percent slopes. This deep, well
drained soil is on terraces and mesas and is formed in alluvium
derived dominantly from sandstone. The native vegetation is mainly
grasses and shrubs. Elevation is 5,300 to 6,800 feet. The average
annual precipitation is 10 to 14 inches, the average annual air
temperature is 46 to 48 degrees F, and the average frost-free
period is 110 to 130 days.
Typically, the surface layer is brown fine sandy loam about 2
inches thick. The subsurface layer is a reddish brown loam 3
inches thick. The upper part of the subsoil is yellowish red or
light reddish brown sandy clay loam 16 inches thick. The lower 15
inches of the subsoil is pinkish white loam. The upper 13 inches
of the substratum is very pale brown loam, and the lower part to a
depth of 74 inches or more is pink loam. In some areas the surface
layer is loam or sandy clay loam.
Included in this unit is about 10 percent Abra soils and 5
percent Progresso soils. Also included are small areas of Clapper
soils and Nyswonqer soils occurring in the small intermittent
drainages.
Permeability of this Barx soil is moderate. Available water
capacity is high. Effective rooting depth is 60 inches or more.
Run-off is slow, and the hazard of water erosion is slight.
1_.J
2.04-18
July 1992