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o Description and sampling of representative horizons of each soil series and <br /> higher taxonomic units for chemical and physical characteristics. <br /> o Interpretation of the analytical results and site-specific characteristics to <br /> determine suitability and depth of soils for topsoil materials. <br /> This report presents all field and laboratory methodology used in the study as well as: <br /> o Soil maps delineating all soil mapping units <br /> o Mapping unit descriptions <br /> o Soil series descriptions <br /> o Chemical and physical data <br /> o Soil suitability ratings, by horizon, for each mapped soil series <br /> o Recommended topsoil salvage depths for each soil series and soil mapping unit <br /> o Prime farmland assessment <br /> General Nature of the Area <br /> The PCC Nucla East study area is located within the Colorado Plateau Physiographic <br /> Province, Canyon Land Section, in southwest Colorado. It is within USDA Major Land <br /> Resource Area 35, Colorado and Green Rivers Plateau (USDA-SCS, 1978). Average elevation <br /> is about 5,700 feet. <br /> Climate. The Nucla East study area is located in an "ustic-aridic" soil moisture regime <br /> and a "mesic" soil temperature regime (Hawn, 1987). <br /> The mean annual precipitation ranges from 10 to 14 inches. Were it not for the presence <br /> of irrigation water throughout most of the study area, the soils would have soil moisture <br /> deficits during the growing season as a result of the quantity and distribution of <br /> precipitation. Periods of peak precipitation occur in the spring and early summer months. <br /> Mean annual air temperature is about 46 to 48 degrees F. The average frost-free period is <br /> about 130 days. Additional climatological data is contained in Tab 5 of this permit <br /> application package (PAP). <br /> Geology. A detailed discussion of the Nucla East geology is presented in Tab 6 of this <br /> PAP. Appropriate sections are summarized in the following text. The Nucla Syncline (San <br /> Migel Syncline) is a northwest trending geologic structure which contains the coal <br /> 9-5-5 Revised 04/11/88 <br />