2012-03-07_PERMIT FILE - C2010088 ‎(16)‎

• Permit No: C2010088
• IBM Index Class Name: Permit File
• Doc Date: 3/7/2012
• Doc Name: Soils Information
• Section_Exhibit Name: Exhibit 07
• Media Type: D
• Archive: No

C2 horizon —18 to 40 inches; light yellowish brown (10YR 6/4) day loam, yellowish brown
(10YR 514) moist; massive structure; hand dry consistence, friable moist consistence, and
sticky and slightly plastic wet consistence; strongly effervescent (strongly calcareous);
from lab data: pH =8.7 (strongly alkaline), EC =37.6 (strongly saline), SAR--65.4 (highly
sodic); gradual wavy boundary.
C3 horizon — 40 to 72 inches; yellowish brown (10YR 5/4) silty day, dark yellowish brown
(10YR 414) moist; massive structure; hard dry consistence, firm moist consistence, and
sticky and slightly plastic wet consistence; strongly effervescent (strongly calcareous);
from lab data: pH=8.8 (strongly alkaline), EC=60.2 (strongly saline), SAR =145 (very highly
sodic); gradual wavy boundary; did not hit bedrock.
Billings loam to silty clay loam was described and sampled at three representative sites,
TLO-1, TLO 2, and TLO-3. The upper 6 inches of TLO-1 is "suitable" although the upper
6 inches of TLO-2 and TLO-3 are not. For TLO -1, the upper 6 inches has a "suitable"
salinity value (EC =1.62, "nonsalinel, and a "suitable" sodicity value (SAR =7.23, "slightly
sodicl with all other parameters also "suitable" (pH, saturation percent, texture, Selenium,
and Boron). By contrast for TLO -2, the upper 6 inches has an "unsuitable" salinity value
(EC =18.5, "strongly saline's and an "unsuitable" sodicity value (SAR =59.6, "very highly
sodic' ), although all other parameters are "suitable ". For Billings sample site TLO -3, the
upper 6 inches also has an "unsuitable" salinity value (EC =17.8, "strongly saline'°) and an
"unsuitable" sodicity value (SAR =57.1, "very highly sodid), although all other parameters
are "suitable".
Even though the upper 6 inches of Billings has dominantly "unsuitable" salinity and
sodicity (2 of the 3 samples sites have "unsuitable° soil values), it is recommended that
the upper 6 inches of Billings be salvaged as topsoil given that this is the only native, non-
disturbed soil material on the project area and it is currently supporting the highly salt and
sodium -tolerant, dominantly greasewood vegetation community. The upper 6 inches of
Billings loam to silty clay loam is the "best available" soil material on the project area and
should be salvaged and stockpiled for use in future reclamation purposes. It was not
possible during soils mapping in the field to distinguish any soil, vegetation, or terrain
parameter that might separate areas of "suitable" upper 64nch Billings from " unsuiitable"
upper 6 -inch Billings — the soil type all looks the same on the surface and in the soil
profile.
All of the Billings soil material below 6 inches is not recommended for salvage due to
dominantly highly "unsuitable" salinity (EC) and sodicity (SAR) values, as well as
"unsuitable" Selenium values below 18 inches for both TLO 2 (Se =1.44 and 1.50 ppm)
and TLO-3 (1.30 and 1.77 ppm).
8 Exhibit 7 — 2010 Train Loadout Soil Survey