2008-01-08_PERMIT FILE - M2008001 (13)

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Map Unit: LnA -Limon silty clay loam (Found in the East and West Pits} The Limon silty clay loam component makes up 95 percent of the map unit. It occurs in the elevation range of 4,300 feet to 5,100 feet. The frost free period is 145 to 175 days. Slopes are 0 to 2 percent. This component is formed on alluvial fans and terraces in clayey alluvium. A typical soil profile is 0 to 4 inches silty clay loam and 4 to 60 inches silty clay. Runoff is medium and the erosion hazard is generally moderate, but can be severe in places. Depth to a root restrictive layer is greater than 80 inches. The natural drainage class is well drained. The capacity of the most limiting layer to transmit water is moderately low to moderately high (0.06 to 0.20 in/hr.) The depth to seasonal high water table is more than 80 inches. The frequency of flooding is occasional while the frequency of ponding is none. The permeability is slow and the available water capacity is high (about 10.3 inches). The sodium adsorption ration is 10.0. 'The maximum content of calcium carbonate is 10 per cent The soils are moderately alkaline to strongly alkaline. Soil pH ranges from7.9 to 9.0. It has a high shrink-swell potential. The soil is non-saline to slightly saline (2.0 to 8.0 mmhos/cm). The soil is difficult to till because it is cloddy when dry and sticky and plastic when wet. The native grasses are mainly galleta, blue grams, and alkali sacaton. The land capability classifications are 3S (irrigated) and 6s (non- irrigated). This component is in the R069XY033C0 Salt Flats ecological site description. Map Unit: OtA -Otero clay loam (Found in the East Pit} The Otero clay loam component makes up 90 percent of the map unit. It occurs in the elevation range of 4,400 feet to 5,200 feet. The frost free period is 145 to 175 days. Slopes are 0 to 1 percent. This component formed on high terraces along the Arkansas River from wind sorted eolian and/or sandy alluvium. Atypical soil profile is 0 to 12 inches clay loam and 12 to 60 inches sandy loam. Runoff is slow and the erosion hazard is slight in irrigated areas and high in non-irrigated areas. Depth to a root restrictive layer is greater than 80 inches. The natural drainage class is well drained. The capacity of the most limiting layer to transmit water is moderately high (0.20 to 0.60 in/hr.) The depth to seasonal high water table is more than 80 inches. The frequency of flooding is none and the frequency of ponding is none: The permeability is rapid and the available water capacity is moderate (about 8.5 inches). The sodium adsorption ration is not available in the data set The maximum content of calcium carbonate is 10 per cent. The surface soils are mildly alkaline and remaining soils are moderately alkaline. Soil pH ranges from7.9 to 8.4. It has a low shrink-swell potential. The soil is non- e. saline (0.0 to 2.0 mmhos/cm). The native grasses are mainly blue grams, and sand dropseed.