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S N V E N T O RY 8~ E V A L U A T I O N <br />Requested By: Rio Blanco County Road & Date: April 3, 1998 <br />Bridge Department <br />by: Joy Surveying Company <br />Assisted 8y. Alvin L. Jones Location: Sec. 36, T2S; <br />Resource Conservationist Sec. 1, T3S; <br />R101W, 6th PM <br />SITLIATION~ You requested an inventory of the existing soil and <br />vegetation for a proposed gravel pit, approximately 10 acres. <br />located in SW1/2SW1/4 of Section 36, T2S, R101W and the <br />NW1/4NW1/4 of Section 1, T3S, R101W, approximately 3 miles up <br />East Douglas Creek at the mouth ofi West Dry Lake Canyon. You <br />also request recommendations for reclamation of the site once the <br />mining is completed. <br />INFOP,r"11aTION PROVIDED- The site is presently in an undisturbed <br />near native condition with limited roads present. <br />1) SOILS - The soil unit which occurs on this site is a complex <br />mapping unit, the Rentsac-Moyerson-Rock Outcrop complex, 5 to 65 <br />percent slopes. It appears that only the Rentsac and Moyerson <br />portions occur within the proposed boundary'of the pit. <br />The Rentsac portion is generally a well drained, shallow <br />soil formed in residuum from sandstone. However, on this site <br />due to material deposition, the depth to bedrock is greater than <br />the standard for the mapping unit of 10-20 inches. This soil <br />normally has a channery loam surface of 9 inches and an extremely <br />flaggy loam 7 inch thick subsoil. Permeability is moderately <br />rapid and the water holding capacity is very low. Runoff <br />potential is medium with a very high erosion hazard. <br />The Moyerson portion is also a normally shallow, well <br />drained soil, but derived from shale- The surface layer is a <br />clay loam about 10 inches thick, with a 7 inch thick clay <br />subsoil. Permeability is slow, and the water holding capacity is <br />low. Runoff is medium to rapid and the erosion hazard is very <br />high. <br />These two soil types are intermixed and may also have <br />inclusions of other soil types. <br />Suitable topsoil is limited <br />be made to save all topsoil and <br />reclamation of the site. <br />on this site. Efforts need to <br />stockpile it for use during <br />2) VEGETATION - The site is within the Clayey Slopes Range Site. <br />The dominate species found on these sites are Pinion and Juniper <br />trees, and big sagebrush, shadescale, greasewood, galleta, <br />beardless wheatgrass, bottlebrush squirreltail grass, Salina <br />wildrye, Junegrass, Indian ricegrass, prickly pear cactus and <br />cheatgrass_ The vegetative ground cover is approximately 10 <br />perr_ent. Tlie annual vegetative production is about 450 <br />pounds/acre air dry. <br />