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GENERAL37695
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GENERAL37695
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Last modified
8/24/2016 7:57:43 PM
Creation date
11/23/2007 9:16:50 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981020
IBM Index Class Name
General Documents
Doc Date
1/7/2005
Doc Name
Proposed Decision & Findings of Compliance for RN4
Permit Index Doc Type
Findings
Media Type
D
Archive
No
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Several ephemeral tributaries to Munger Canyon were originally planned to be undermined <br />during the five-year permit period and life of mine. In addition, two ephemeral tributaries to Big <br />Salt Wash; Buniger and Stove Canyons, were also planned to be undermined during the five-yeaz <br />permit period and life of mine. Only one Munger tributary has been undermined to date, and <br />under the TR-16 mine plan revision, no further undermining is proposed. <br />Climate <br />The climate in the region is semi-arid. Prevailing winds at or near ground level at the mine are <br />dictated by the orientation of the deeply incised Munger Canyon and occur from the <br />north-northwest. The annual average precipitation recorded at Fruita (21 miles southeast of <br />Munger Canyon) is 8.8 inches. In the immediate mine vicinity, annual precipitation increases <br />with elevation from approximately 11 inches along the East Salt Creek valley, to approximately <br />15 inches along the ridges above 7000 feet. Mean monthly temperatures recorded at Grand <br />Junction range from 26.6 to 78.70F, and mean annual temperature is estimated at 52.70F. <br />Land Use <br />Land use within the permit and adjacent azea is grazing and wildlife habitat. Grazing is generally <br />confined to the lower-lying canyon bottom lands. The upland area consists of steep slopes and <br />rugged topography and is primarily used by wildlife. Some irrigated agriculture is practiced in <br />the East Salt Creek Valley, which is adjacent to the permit area. <br />Soils <br />The soils mapped in the perrnit azea consist of the Glendive, Havre, Nihill and Rivra series, <br />which are well too excessively drained and have formed in alluvial or colluvial sediments. Soils <br />aze deepest in the valley bottoms and become shallower along the canyon sideslopes where they <br />intersperse with baze rock. All of the soils aze rated good to fair as sources of topsoil for <br />reclamation. Limitations exist, however, for subsoils in the alluvium which demonstrate strongly <br />alkaline pH values. <br />Vegetation <br />The mine occurs within the lower montane climax region. Four distinct vegetation types occur <br />within and adjacent to the permit azea. A greasewood shrubland type occupies the flat terrain <br />along the East Salt drainage. Big sagebrush shrubland occurs along drainages and sidedraws to <br />East Salt Creek where soils aze deep and well drained. Shadscale shrubland borders the <br />greasewood shrubland along the dry, steeper, south-facing slopes in the shallower soils, which <br />are interspersed with rock outcrops. Finally, Juniper woodland is found along the ridgetops and <br />steep north and west-facing slopes of shallow soils and rock outcrops. These vegetation types are <br />common to western Colorado and Utah. <br />11 <br />
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