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o Determination and delineation of soil series and soil mapping units. • <br />o Description and sampling of representative horizons of each soil series and <br />higher taxonomic units within the projected disturbance area for chemical and <br />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 />c Chemical and physical data <br />o Soil suitability ratings, by horizon, for each mapped soil series and series <br />variant <br />o Recommended topsoil salvage depths for each soil series, series variant, soil <br />family, and soil mapping unit within the projected disturbance area <br />o Prime farmland assessment <br /> <br />General Nature of the Area <br />The study area is located within the Wyoming Basin Physi ographic Province, in northern <br />Colorado (Bass et al., 1955). It is within USDA Major Land Resource Area 48, Southern <br />Rocky Mountains (USDA-SCS, 1978). Elevations within the study area range from about 6,940 <br />to 7,480 feet. <br />Climate. The study area is located in an "ustic-aridic" soil moisture regime and a <br />"cryic-frigid" soil temperature regime. The climate is typically continental or <br />intermountain footslopes with cold winters, warm to hot summers, moderately low rainfall, <br />and relatively short growing seasons. <br />The mean annual precipitation ranges from about 17 to 20 inches. Moisture is limiting <br />within these soils, but the soil moisture is present during the growing season as a result <br />of the quantity and distribution of precipitation. Periods of peak precipitation occur as <br />snowfall during winter and as thundershowers during early summer months. <br />• <br />Mean annual air temperature is about 36 to 40 degrees F. The average frost-free period <br />9-6-5 Revised 05/16/88 <br />