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(b) RELATIONSHIP OF PRESENT VEGETATION 70 SOIL TYPES <br />Croplands, Irrigation Ditches, Farm Trees, and Landscape Trees and Shrubs <br />Most of the proposed sand and gravel mining area has been mapped by the Natural Resources <br />Conservation Service (formerly the Soil Conservation Service) as Altvan Loam, 0 to 1 percent slopes. This <br />is described as a deep, well-drained soil on terraces at elevations from 4,500 top 4,900 feet. Permeability <br />and available water capacity are moderate, surface runoff is stow, and erosion hazard is low. <br />The eastern edge of the proposed mining area is mapped as Dacono clay loam 0 to 1 percent slopes. This <br />is also described as a deep, well-drained soil on terraces, at elevations of 4,550 to 4,970 feet. Permeability <br />is moderately low, available water capacity is moderate, and erosion hazard is low. <br />Degraded Pasture and Wetland <br />The degraded pasture and small wetland east of U.S. 85 in the northwestern comer of the site are mostly <br />within Aquolls and Aquents, gravelly substrate. This mapping unit occurs on bottomlands and floodplains <br />of major streams, including the South Platte River. They are deep, poorly drained soils that are subject to <br />flooding, with protracted portions of the growing season being saturated at or near the soil surface. <br />Terrace Slope <br />Separating the low-lying pasture and wetland from the higher terraces is a tenace slope mapped as Ustic <br />Torriorthents, moderately steep. These are described as deep, excessively drained (i.e., droughty) soils on <br />terrace breaks and escarpments at 4,450 to 5,100 feet. Permeability is rapid, available water capacity is <br />tow, surface runoff is medium, and erosion hazard is moderate. This slope onsite is steep and west-facing <br />and supports a narrow ribbon of dry, weedy vegetation that has not been farmed but has been impacted by <br />grazing or other prior disturbance. <br />(c) Annual Production and Groplands <br />Because the post-mining land use of the mining area consists of open-water reservoirs, information on <br />average annual production of existing hay meadows and croplands was not collected. <br />SW TKO Joint Venture, LLC. -Adams Sand and Gravel Mine -112 Reclamation Permit Amendment Page 30 <br />