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=Walsh <br />Environmental Scientists and Engineers, LLC <br />developing in weathered, interbedded sandstone, siltstone, and shale, as well as in local <br />colluvium, slopewash, and streamlain alluvium. Plant rooting depth corresponds with soil <br />depth. Most soils are moderately well drained to well drained. Soils support mostly native <br />vegetation used for livestock grazing and wildlife habitat. The soil survey for Moffat <br />County was recently completed by the USDA Natural Resources Conservation Service <br />(NRCS 2005) and it was used to describe the various mapping units (Figure 6): <br />Map Unit 37: Cochetopa loam, 12 to 25 percent slopes <br />The elevation for this mapping unit is 7,200 -8,300 feet amsl. Annual precipitation is 18- <br />20 inches and the frost -free period is 50-75 days. Eighty -five percent of the mapping unit <br />is Cochetopa soil with 15 percent minor component. The fine, montmorillonitic Argic <br />Pachic Cryoborolls has residuum derived from sandstone and shale parent material and is <br />a deep, well- drained soil. The Mountain Loam ecological site supports potential <br />vegetation of slender wheatgrass, Letterman's needlegrass, mountain big sagebrush, elk <br />sedge, mountain brome, mountain snowberry, nodding brome. The minor soils are Jerry <br />and similar soils, and Routt and similar soils. <br />Map Unit 52: Danavore -Waybe complex, 5 to 30 percent slopes <br />The elevation for this mapping unit is 7,200-8,600 feet amsl. Annual precipitation is 18- <br />20 inches and the frost -free period is 50-75 days. Fifty -seven percent of the mapping unit <br />is Danavore -Waybe complex soils, 30 percent Waybe and similar soils, and minor <br />components 13 percent. The Danavore soil is a loamy- skeletal, mixed (calcareous) Typic <br />Cryorthents, while Waybe is a clayey, mixed (calcareous), shallow Typic Cryorthents. <br />Both soils are well- drained and shallow. Patent material is residuum derived from <br />sandstone and shale. The Dry Exposure ecological site supports potential vegetation of <br />bluebunch wheatgrass, black sagebrush, bottlebrush squirreltail,, western wheatgrass, <br />needle and thread, prairie Junegrass. The minor component is rock outcrop. <br />Map Unit 117: Lamphier -Jerry complex, 25 to 65 percent slopes <br />The elevation for this mapping unit is 7,200 -8,600 feet amsl. Annual precipitation is 18- <br />20 inches and the frost -free period is 50-75 days. Forty -five percent of the mapping unit <br />is Lamphier and similar soils; 30 percent is Jerry and similar soils, and 25 percent minor <br />components. Lamphier soils are Fine - loamy, mixed Pachic Cryoborolls, while Jerry soils <br />are Fine, montmorillonitic Argic Cryoborolls derived from colluvium and residuum <br />derived from sandstone. Both soils are well - drained and deep. The Brushy Loam <br />ecological site supports potential vegetation of Gambel's oak, Saskatoon serviceberry, elk <br />sedge, mountain brome, Letterman's needlegrass, mountain snowberry, nodding brome, <br />and slender wheatgrass. The minor soils are Moderately Deep Soils and similar soils, <br />Skyway and similar soils, Danavore and similar soils, and rock outcrop. <br />Map Unit 127: Maudlin - Duffymont complex, 3 to 15 percent slopes, very stony <br />The elevation for this mapping unit is 6,500 -8,000 feet amsl. Annual precipitation is 16- <br />18 inches and the frost -free period is 65 -85 days. Fifty percent of the mapping unit is <br />Maudlin and similar soils,' 30 percent is Duffymont and similar soils, and 20 percent is <br />minor components. Maudlin soils are Fine - loamy, mixed Typic Argiborolls and <br />P. ' PROJECTS Col..'"' IAL.F:\ Final Collom.IS OI ir.Joc <br />20 <br />