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GENERAL48692
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GENERAL48692
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Last modified
8/24/2016 8:25:21 PM
Creation date
11/23/2007 4:30:03 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981019
IBM Index Class Name
General Documents
Doc Name
Proposed Decision & Findings of Compliance
Permit Index Doc Type
General Correspondence
Media Type
D
Archive
No
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-6- <br />The Trout Creek Sandstone outcrops north of the permit area, where ground water <br />is discharged at the surface, The Mancos Shale underlies the Isles Formation <br />and forms the base of the regional ground water system in the area. The <br />shale is exposed at the surface north of the permit area, in the southern <br />limb of the Axial Basin Anticline. Due to the impervious nature of the Mancos <br />Shale, ground water in transit in either the deep bedrock units of the <br />Williams Fork and Isles Formations, or the alluvial aquifer of Good Spring <br />and Wilson Creeks, is discharged to the streams where it flows across the <br />Mancos Shale. <br />The permit area is drained by two perennial streams; Good Spring Creek to <br />the east, and Wilson Creek to the west. Taylor Creek, an intermittent stream, <br />flows into Wilson Creek north of the rail Zoadout. Several ephemeral drainages <br />occur on the permit area, including the Streeter Drainage. The Lower portion <br />of the drainage has been relocated as a result of an excess overburden fill <br />at the mouth of Streeter Canyon, near the confluence of Streeter Drainage and <br />Good Spring Creek, These drainages are tributary to Mi.Ik Creek, which flows <br />into the Yampa River about 6 miles north of the permit area. Precipitation <br />averages 18 inches annually on the property. Runoff is limited and the <br />flows in the drainages are mainly in response to snowmelt or intense thunder- <br />storm events. <br />Water sampled from the drainages is quite hard, dominated by calcium and <br />magnesium cations and bicarbonate and sulfate anions. The reZati~veZy high <br />alkalinity and pX of the system impedes the solubility and transport of heavy <br />cations, thus minimizing potential toxicity problems associated with heavy <br />metals or acid drainage. <br />No alluvial valley floors (A VF's) exist within the area to be mined. However, <br />several AVF's do exist within the proposed permit area and adjacent areas. <br />The alluvial deposits of Good Spring Creek, Wilson Creek, and Lower Elkhorn <br />Creek meet the geomorphic and irrigation criteria of an AVF. <br />The region is characterized by a semi-arid steppe climate regime. A significant <br />portion of the yearly precipitation occurs as snow fall. Prevailing winds <br />over the permit area are from the southwest and average 8-9 miles per hour. <br />High winds are not common, due to the protection afforded by local terrain. <br />The most prevalent soils at CoZowyo (the Burnette and Work Loams) are mollisols <br />of the suborder boroZl, which developed on gently sloping to rolling ridgetops, <br />moderately steep sideslopes, and in gently sloping concave narrow stream <br />valleys. Shallow, rocky soils of the order entisol occur to a limited extent <br />within the area to be disturbed on steep, south-facing slopes. For the most <br />part, the soils that developed on the gentle slopes and swales, including the <br />Burnette and Work Loams, are deep Zoams and clay Ioams with physical and <br />chemical properties that are well.vited for revegetation. One soil unit, <br />the Campspass Fine Sandy Loam, which occupies considerable acreage in the <br />southern and western portions of the permit area, is characterized by subsoils <br />high in clay content. These soils, if salvaged and redistributed directly <br />on the regraded spoils, could hamper reclamation efforts due to the high <br />runoff and erosion hazards and the slow permeability and droughty conditions <br />associated with the fine textured soil. <br />
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