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AC horizon — 0 to 6 inches; very pale brown (10YR 7/3) silty clay loam, pale brown (10YR <br />613) moist; moderate medium platy structure; slightly hard dry consistence, friable moist <br />consistence, and slightly sticky and slightly plastic wet consistence; few coarse, medium, <br />fine, and very fine roots; moderately effervescent (moderately calcareous); from lab data: <br />pH =8.4 (moderately alkaline), EC =18.5 (strongly saline), SAR =59.6 (very highly sodic); <br />gradual smooth boundary. <br />C1 horizon — 6 to 18 inches; yellowish brown (10YR 5/4) siltiy clay loam, dark yellowish <br />brown (10YR 4/4) moist; massive structure; slightly hard dry consistence, friable moist <br />consistence, and sticky and slightly plastic wet consistence; few coarse, medium, fine, <br />and very fine roots; moderately effervescent (moderately calcareous); from lab data: <br />pH =8.6 (strongly alkaline), EC =27.6 (strongly saline), SAR=68.0 (very highly sodic); <br />gradual wavy boundary. <br />C2 horizon —18 to 40 inches; light yellowish brown (10YR 6/4) day loam, yellowish brown <br />(10YR 5/4) moist; massive structure; slightly hard dry consistence, firm moist consistence, <br />and sticky and slightly plastic wet consistence; strongly effervescent (strongly calcareous); <br />from lab data: pH =8.8 (strongly alkaline), EC =35.6 (strongly saline), SAR =54.3 (very <br />highly sodic); gradual wavy boundary. <br />C3 horizon — 40 to 72 inches; light yellowish brown (10YR 6/4) silty clay, yellowish brown <br />(10YR 5/4) moist; massive structure; slightly hard dry consistence, firm moist consistence, <br />and sticky and slightly plastic wet consistence; strongly effervescent (strongly calcareous); <br />from lab data: pH =8.8 (strongly alkaline), EC =53.2 (strongly saline), SAR =103 (very highly <br />sodic); gradual wavy boundary; did not hit bedrock. <br />Billings Typical Sample "TLO -3" Site and Profile Description: 2% slope, southwest <br />aspect; greasewood vegetation; alluvial plain position; local, highly alkaline alluvium <br />parent material; moderate erosion in the vicinity of the sample site; GPS coordinates: <br />North 39 degrees, 10.814'; West 108 degrees, 47.422. <br />AC horizon — 0 to 6 inches; very pale brown (10YR 7/3) loam, pale brown (10YR 6/3) <br />moist; moderate coarse platy structure; soft to slightly hard dry consistence, friable moist <br />consistence, and slightly sticky and slightly plastic wet consistence; few coarse, medium, <br />fine, and very fine roots; strongly effervescent (strongly calcareous); from lab data: <br />pH =8.5 (strongly alkaline), EC =17.8 (strongly saline), SAR =57.1 (very highly sodic); <br />gradual smooth boundary. <br />C9 horizon — 6 to 18 inches; light yellowish brown (10YR 6/4) day loam, yellowish brown <br />00YR 5/4) moist; massive structure; slightly hard dry consistence, friable moist <br />consistence, and sticky and plastic wet consistence; few coarse, medium, fine, and very <br />fine roots; strongly effervescent (strongly calcareous); from lab data: pH =8.7 (strongly <br />alkaline), EC =30.6 (strongly saline), SAR =74.9 (very highly sodic); gradual wavy <br />boundary. <br />7 Exhibit 7 — 2010 Train Loadout Soil Survey <br />