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• 2.1 Map Unit D -Gravel Guarry and Fadlities SRe-Addendum Blocks 1 and 2 <br />Block 1 soils (Kim loams) occur on a southeast aspect at slopes less than or equal to 1 percent. These <br />soils appear to have been flood irrigated in the past but have not been cropped recently. Some limited <br />irrigation may have occurred in combination with grazing activities. Surtidal soil cover over this block <br />averaged 45 percent vegetation, 25 percent coarse fragments, 10 percent litter, and 20 percent bare <br />ground. Depths to high coarse fragment layers of the soil profiles ranged from 6 to 18 inches, with the <br />shallowest depths associated with the southern portions of the block and the deepest with the northem <br />portions of the block. Coarse fragment percentages of the upper soil horizons (6 to 18 inches) did not <br />exceed 10 percent by volume. <br />The dominant soils of Block 1 have a sandy day loam texture, a pH of 8.0, and an electrical conductivity of <br />0.4 mmhos/an. All micro-nutrient levels are within acceptable limits. Therefore, this soil is of an <br />acceptable quality for salvage and reapplication to areas to be revegetated. Given the range of depths (8- <br />18 inches) to a high coarse fragment layer, this soil is assumed to be salvageable to an average depth of <br />12 inches over the Block 1 portion of the addendum area. <br />Block 2 soils, also dominated by the Kim loam series, parallel those of Blodc 2 in terms of land use, slope, <br />and aspect. In addition, there are few differences in surfidal soil cover percentages of vegetation, coarse <br />fragments, and litter. Depths to soil layers with high coarse fragment contents also range from 6 to 18 <br />inches with the deepest depths found in the northern portion of the block. The percent of coarse <br />fragments in the surticial soil horizons, by volume, is equal to or less than 10 percent. <br />The dominant soil of Block 2 has chemical and physical characteristics closely paralleling those of the <br />dominant soil of Block 2. The most notable exception to this is the somewhat elevated concentrations of <br />both macro-and micro-nutrients potentially indicating a more alive historic fertiQzalion program. This soil is <br />also assumed to be salvageable to an average overall depth of 12 inches given the variability of soil depths <br />over the Block 2 addendum area. <br />REFERENCES <br />U.S.D.A. Natural Resources Conservation Service (SCS), 1995. Soil survey of Fremont County area, <br />Colorado. U.S.D.A. Natural Resources Conservatioo Service. Canyon Cdy, Colorado. 338 pp. + maps. <br />• <br />