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eastern edge of the landform and the adjacent steep sideslope. There is enough elevation <br />rise of the valley bottom from west to east that this gap appears not to compromise the <br />water -holding capacity of the lower end near the creek. Discussion with a McClane <br />Canyon Mine employee during soil sampling activities indicated an older employee may <br />have knowledge about the history of the valley and possible dam construction. <br />A third possibility is that the landform started out as a landslide feature, perhaps coming <br />from the east not the west, and was later built up to function as a dam. There are a few <br />concave, swale-like features on both sides of the dam that might be old soil borrow <br />areas.From a soil point of view, the soil of Map Unit I (throughout the sampled depth of 8 <br />feet) is similar to that of Cameo fine sandy loam in Map Unit H, although without any <br />subsoil development (no "BW' or "BC" horizons). However, the soil of this landform was <br />separately delineated as Map Unit I and was described and sampled at one representative <br />site on the top of the feature, MC22. <br />Unnamed Typical Sample "MC22" Site and Profile Description:2% slope, west aspect; <br />greasewood with some grasses and forbs vegetation; gently sloping, elongate east -west <br />trending hill feature; local, coarse -loamy alluvium; no erosion in the vicinity of the sample <br />site; GPS coordinates: North 39 degrees, 26.220'; West 108 degrees, 46.741'. <br />A horizon — 0 to 5 inches; pale brown (10YR 6/3) fine sandy loam with 10% mixed gravels, <br />brown (10YR 5/3) moist; weak medium platy and granular structure; slightly hard dry <br />consistence,friable moist consistence, and slightly sticky and slightly plastic wet <br />consistence; common fine and very fine and few coarse and medium roots; slightly <br />effervescent; from lab data: pH=7.8 (slightly alkaline), EC=0.39 (nonsaline), SAR=0.49 <br />(nonsodic); OM=2.2% (high); gradual smooth boundary. <br />C1 horizon — 5 to 20 inches; light yellowish brown (10YR 6/4) sandy loam with about 5% <br />mixed gravels, yellowish brown (10YR 5/4) moist; weak medium subangular blocky <br />structure grading to massive structure; slightly hard to hard dry consistence, friable moist <br />consistence, and slightly sticky and slightly plastic wet consistence; common fine and very <br />fine and few coarse and medium roots; slightly to moderately effervescent; from lab data: <br />pH=8.0 (moderately alkaline), EC=0.36 (nonsaline), SAR=1.55 (nonsodic); OM=1.0% (low <br />to medium); gradual wavy boundary. <br />C2 horizon — 20 to 40 inches; light yellowish brown (10YR 6/4) sandy loam with about 5% <br />mixed gravels, yellowish brown (10YR 5/4) moist; massive structure; hard dry consistence, <br />firm moist consistence, and slightly sticky and slightly plastic wet consistence; few fine and <br />very fine roots; moderately to strongly effervescent; from lab data: pH=9.0 (strongly <br />alkaline), EC=2.02 (very slightly saline), SAR=13.7 (moderately sodic); OM=1.0% (low to <br />medium); gradual wavy boundary. <br />C3 horizon — 40 to 60 inches; yellowish brown (10YR 5/4) sandy loam with about 5% <br />mixed gravels, dark yellowish brown (10YR 4/4) moist; massive structure; very hard dry <br />consistence, firm moist consistence, and slightly sticky and slightly plastic wet consistence; <br />-11- <br />