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4-12 <br />. 4.4 GROUND WATER HYDROLOGY <br />4.4.1 Regional Hydrogeology <br />The Munger mine permit area lies north of Grand Valley in the <br />rugged terrain drained by East Salt Creek and its deeply incised <br />tributaries. Reaches of East Salt Creek in the area of the activ- <br />ity are intermittent by definition. The stream flows generally <br />southwestward through the permit area to the Colorado River, a <br />distance of about 20 miles. All tributaries of East Salt Creek <br />traversing SEI leases are ephemeral. All such channels are a <br />result of ephemeral streams which flow only in direct response <br />to precipitation in the immediate watershed or in response to <br />the melting of a cover of snow or ice, and which have channel <br />bottoms that are always above the local water table. <br />• Strata underlying the lease are a, and specifically the permit <br />area, strike north-northwestward and dip one to three degrees <br />northeastward upvalley in the opposite direction to streamflow. <br />Thus, the Cameo coal seam, which would be mined under the pro- <br />posed action is exposed in the precipitous slopes bordering East <br />Salt Creek and its tributaries in all but the northeastern part <br />of the SEI Lease Block, upstream from the mouth of Spink Canyon. <br />There, the Cameo bed dips below the floor of East Salt Creek <br />Valley at an elevation of about 5,600 feet. <br />No springs or seeps issuing from the Cameo seam or from sandstone <br /> <br />