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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 0.1N RC1 (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 />o depth to ground water, if encountered <br />o salts or alkali <br />o surface stoniness <br />The sampling site location and number were plotted on the photographic field map. One <br />2-quart sample was taken to represent each natural soil horizon or contrasting layer <br />within the depth to 72 inches or bedrock, whichever ryas shallower. <br />u <br />Samples were collected from hand-dug pits and three-inch diameter auger holes that were <br />dug at all soil sampled sites. The sampled soil material was placed in clean, labeled, <br />polyethylene plastic bags, and was kept cool and as dry as passible to limit chemical <br />changes. Most horizons of all profiles were moist upon sampling and were air dried prior <br />to shipment to PCL in Freeburg, Illinois for analysis. Each sample was split at the <br />laboratory with one portion being used for analysis and the archival portion retained for <br />additional tests, if necessary. • <br />9-6-13 Revised 05/16/88 <br />