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• • depth to ground water, if encountered <br />• salts or alkali <br />surface stoniness <br />The sampling site location and number were plotted on the field map as accurately as possible. <br />One 2-quart sample was taken to represent each natural soil horizon or contrasting layerwithin the <br />depth to 72 inches or bedrock, whichever was shallower. <br />Samples were collected from hand-dug pits, three-inch diameter auger holes or backhoe trenches <br />that were dug at all soil sampled sites. The sampled soil material was placed in clean, labeled, <br />polyethylene plastic or Tyvek® bags, and was kept cool and as dry as possible to limit chemical <br />changes. The upper horizons of many profiles were moist upon sampling and were air dried prior <br />to shipment to IML in Sheridan, Wyoming (1988) or Colorado State University (1996 and 1998) for <br />analysis. Each sample was split at the laboratory with one portion being used for analysis and the <br />• archival portion retained for additional tests, if necessary. <br />Prime Farmland Determination <br />The Montrose County NRCS district office in Norwood, Colorado, was contacted for determination <br />of prime farmland status for the study area. In addition, onsite evaluations were made to determine <br />whether prime farmland existed. <br />Evaluation of Soils for Reclamation Potential <br />The soils and parent materials on the study area were rated for suitability based on criteria <br />presented in Table 2.04.9-2, Criteria for Evaluating Soil Suitability. These suitability criteria were <br />approved by CDMG in the scope-of-work. Recommended topsoil salvage depths were generated <br />foreach sampled pedon and each component of a mapping unit. Salvage depths were determined <br />following a detailed evaluation of pH, electrical conductivity, saturation percent, soil texture, Sodium <br />Adsorption Ratio, calcium carbonate percent, and coarse fragment percent. <br />• <br />(Revised March 2006) 2.04.9-12 <br />