PERMFILE138686 - Laserfiche WebLink

Home Browse Search

• surface stoniness The sampling site location and number were plotted on the feld map as accurately as possible. One 2-quart sample was taken to represent each natural soil horizon or contrasting layer within the depth to 72 inches or bedrock, whichever was shallower Samples were collected from hand-dug pits, three-i nch diameter auger holes or backhoe trenches that were dug at all soil sampled sites. The sampled soil material was placed in clean, labeled, polyethylene plastic or Tyvek® bags, and was kept cool and as dry as possible to limit chemical changes. The upper horizons of many profiles were moist upon sampling and were air dried prior to shipment to IML in Sheridan, Wyoming (1988) or Colorado State University (1996 and 1998) for analysis. Each sample was split at the laboratory with one portion being used for analysis and the archival portion retained for additional tests, if necessary. Prime Farmland Determination • The Montrose County NRCS district offce in Norwood, Colorado, was contacted fordetermination of prime farmland status for the study area. In addition, onsite evaluations were made to determine whether prime farmland existed. Evaluation of Soils for Reclamation Potential The soils and parent materials on the study area were rated for suitability based on criteria presented in Table 2.04.9-2, Criteria for Evaluating Scil Suitability. These suitability criteria were approved by CDMG in the scope-of-work. Recommended topsoil salvage depths were generated for each sampled pedon and each component of a mapping unit. Salvage depths were determined following a detailed evaluation of pH, electrical conductivity, saturation percent, soil texture, Sodium Adsorption Ratio, calcium carbonate percent, and coarse fragment percent. Topsoil salvage depths were based on average depths to the suspect parameter or average profile (REVISED 2/00) 2.04.9-8