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about six inches of soil material per sample. Sub-horizons (B1, 82, etc.), greater than <br /> three inches within any major horizon, were separately sampled and analyzed. In the <br /> substratum (C horizon), natural horizons (Cl, C2, and so forth) were subdivided such that <br /> individual samples did not represent greater than about 18 inches of soil material . <br /> Physical and, where possible, chemical properties of each horizon within the sampled <br /> profile were described and recorded in the field on standard SCS 11232" soil description <br /> forms. These properties included: <br /> o depth and thickness of horizons <br /> o relative position of soil horizons <br /> o type and nature of horizon boundaries <br /> o color (dry and moist) of horizons <br /> o texture (fine earth fraction) <br /> o coarse fragment content (type - gravel , cobble, sandstone channer, etc.; size <br /> (2mm-3", 3"-10", greater than 10"); and percent (%) by volume, if significant) <br /> o soil structure (type, size, and grade) <br /> o soil consistence (dry, moist, and wet) <br /> o roots (number, size, and depths) <br /> o clay films, if present (number, thickness, occurrence) <br /> o effervescence with 0.lN HC1 (none, slight, moderate, strong, violent) <br /> o mottles, if present (number, size, distinctness, color) <br /> o soil moisture characteristics at the time of sampling <br /> In addition, at each soil sampling site, the following parameters were also described: <br /> o vegetation <br /> o parent material <br /> o physiography (geomorphic position) <br /> o relief, if significant <br /> o elevation (obtainable from topographic maps) <br /> o slope <br /> o aspect <br /> o erosion condition <br /> o permeability <br /> o internal drainage class <br /> 9-5-14 Revised 04/11/88 <br />