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o depth to ground water, if encountered <br /> 0 salts or alkali <br /> o surface stoniness <br /> The sampling site location and number were plotted on the field map as accurately as <br /> possible. <br /> One 2-quart sample was taken to represent each natural soil horizon or contrasting layer <br /> within the depth to 72 inches or bedrock, whichever was shallower. <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 or canvas bags, and was kept cool and as dry as possible to limit <br /> chemical changes. The upper horizons of many profiles were moist upon sampling and were <br /> air dried prior to shipment to IML in Sheridan, Wyoming for analysis. Each sample was <br /> split at the laboratory with one portion being used for analysis and the archival portion <br /> retained for additional tests, if necessary. <br /> Soil Horizon Nomenclature. In 1982 the USDA-Soil Conservation Service adopted a new <br /> system of soil horizon nomenclature (Guthrie and Witty, 1982). All soil series being <br /> mapped within ongoing soil surveys would be revised before publication. Soil series not <br /> being mapped on current SCS soil surveys would not be revised at this time. <br /> As a result some soil series descriptions might need horizon nomenclature revision in <br /> order to be consistent with SCS standards and methods. The PCC Nucla East soil survey <br /> was conducted in accordance with the standards of the Nationai Cooperative Soil Survey. <br /> This horizon nomenclature revision, as necessary, was completed as part of this final <br /> report. <br /> Soil Series Correlation. All PCC Nucla East soil series were correlated with existing SCS <br /> soil series criteria. Current soil series descriptions, Form 5's (Soil Interpretation <br /> Record), and soil laboratory data, if available, for soils previously mapped on the study <br /> area, were obtained from SCS and delivered to PCC for their files. This information <br /> facilitated soil series correlation. <br /> Prime Farmland Determination. The Colorado State Office of SCS in Denver was contacted <br /> 9-5-15 Revised 04/11/88 <br />