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I-2 <br /> <br />The soil survey and sampling were completed during August, 1984. The <br />soils distribution on approximately 1,620 acres was mapped on aerial <br />photographs at a scale of approximately 1:6,000 (Figure I-1 ). The <br />soils distributed .in the sodium lease tracts are illustrated in Figure <br />I-2. Soil patterns were studied in different landscapes, and the soil <br />boundaries were predicted according to features such as physiographic <br />position, vegetation, parent material, and soil morphology. Soil <br />patterns described in the Rio Blanco Soil Survey and landscape features <br />were used to establish the soils mapping unit boundaries. A number of <br />soil profiles werft evaluated to determine the nature and extent of <br />soils in a mapping unit. <br />Soil characteristics were examined in hand-dug sample holes, road cuts, <br />and gullies. The hand-dug holes were excavated to a depth of 32 <br />inches. The lower substrata were examined by means of a 3 inch <br />diameter hand auger to a minimum depth of 60 inches or to indurated <br />• bedrock, whichever occurred first. General soil descriptions were <br />taken and compared to the established SCS soil series description. <br />Soils were mapped to the phase unit of classification; however, soil <br />separation was based largely on use and management. New series or <br />soil variants were not separated at a family level if the soils were <br />managed in the same manner. However, the different soil characteris- <br />tics are discussed in the general soil description. <br />1.3 Soil Sampling and Analysis <br />One profile for each soil series was sampled in the project area. <br />Physical and chemical properties of the soils were also analyzed. <br />These data were used to test field observations, confirm soil classi- <br />fication, evaluate topsoil suitability, and to make preliminary soil <br />fertility assessments. Soils were analyzed for the parameters listed <br />in Table I-1 in accordance with the indicated laboratory procedures. <br />Soils were tested for molybdenum, selenium, and boron whenever the <br />vegetation, water tests, or soils indicated potential problems. <br />Analytical results are listed in Table I-2. <br />THIS DOCUMENT CONTAINS TRADE SECRETS AND PRIVILEGED, CONFI DENTI AL AND <br />P NOFO RMATION ~PUREiUA1NT TO LAW THOOSE POR (IONS MAR ED' CON IDENTIAL'AND'r n x n <br />MAY NOT BE DISCLOSED, COPIED OR MADE AVAILABLE FOR PUBLIC INSPECTION. Y~Y~ ~ U~ <br />