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I N V E N T O R Y 8. E V A L U A T I O N Requested By: Rio Blanco County Road & Date: April 26, 1995 Bridge Department by: Richard Atkins Assisted By: Alvin L. Jones Location: Sec. 34, TIN, District Conservationist R93W, 6th PM Wakara Pit SITUATION: You requested an inventory of the existing soil and vegetation for a proposed 20.6 acre gravel pit site located in SE 1/4 Section 34, TIN, R93W, approximately 6 miles southeast of Meeker. You also request recommendations for reclamation of the site once the mining is completed. INFORMATION PROVIDED: The site is currently in near native condition, with the primary use of livestock grazing. 1> SOILS - Four soil units have been mapped on the proposed site. However, inclusions of other soils may occur within these mapped units. Following is a description of the soil mapped on this proposed site: a. Soil Mapping Unit 11 - Borollic Calciorthids-6uben complex, 6 to 50 percent slopes. This unit occurs on uplands and sides of terraces. The two soil types of this unit are intermixed and cannot be practically mapped separately. Fifty-five percent of this mapping unit is the Borollic Calciorthids portion of this complex, which occur on terrace side slopes. The soil material is at least 15 percent calcium carbonate. This soil is moderately deep to deep and are well drained. It was formed in calcareous alluvial and glacial outwash derived mixed sources. The surface layer is a gravelly or cobbly loam, clay loam or sandy loam 2 to 5 inches thick. The underlying material ranges from very gravelly sandy loam or cobbly sandy loam to very gravelly loamy sand or cobbly loamy sand. Depth to soft shale or sandstone may range from 20 to 60 inches. Runoff is medium to rapid, and the hazard of water erosion is moderate to high. The fiuben portion of this unit is a deep and well drained. It was formed in thin eolian deposits over calcareous alluvium and glacial outwash material. Typically, the surface layer is a loam 6 inches thick. The next layer is a loam 5 inches thick. The upper 4 inches of the underlying material is a gravelly loam, the next 8 inches is a very gravelly loam, and the lower part to a depth of 60 inches or more is mainly a stratified very cobbly sandy loam that is more than 15 percent calcium carbonate. Runoff is medium and the hazard of water erosion is slight to high. -~ b. Soil Mapping Unit 31 - Dollard silty clay loam, 15 to 40 percent slopes. This is moderately deep, well drained soil on foothills and ridges. It formed in clayey residuum derived dominantly from shale. Typically the soil horizons are all silty clay loam to a depth of 20 to 40 inches, at which depth shale is usually encountered. The surface runoff is rapid and the erosion hazard is very high.