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<br />slope is used for the face of the waste pile. This analysis provided a range <br />of factors of safety between 1.85 and 2.74, well above the required 1.5. <br />An intercept channel was constructed at the top of the bank to divert flow <br />originating above it away from the bank and into the east side drainage. <br />Similarly, a channel was constructed at the bottom of the waste bank to <br />intercept runoff from the pile. An underdrain system was constructed <br />beneath fill and drains into the east side drainage (4.04.8(3)). <br />F. Impoundments <br />1. Impoundments are not proposed at this time. <br />G. Surface and Ground Water Monitoring <br />The applicant will conduct monitoring of ground water in a manner <br />approved by the Division. The ground water monitoring plan is as follows: <br />(4.05.13(1)). <br />Ground Water Hydrology <br />Ground water hydrology information may be found in the pernrit application <br />in Section 2.04 and 4.05. <br />Two aquifers have been identified within the area potentially affected by the <br />King Coal operation: the Hay Gulch alluvial aquifer; and, the Point <br />Lookout Sandstone. <br />The Hay Gulch alluvial aquifer, which is adjacent to the operation, averages <br />20 feet in depth and had a cross sectional area of 25,200 square feet, with <br />an estimated transrnissivity of 70,400 gallons per day per foot (gpd/ft.). <br />The water table surface in this alluvial aquifer varies with season from <br />above ground surface to about 3 feet below the surface. The direction of <br />flow in this unconfined system is postulated to be in a downstream <br />direction, parallel to the strike of Hay Gulch. Recharge to the alluvium is <br />from snownrelt and precipitation infiltration, and from the Menefee <br />Fornration contact along the north side of Hay gulch. Sampling of this <br />alluvial water by National King Coal indicates that the water is high in total <br />dissolved solids. The poor quality of the water makes it unsuitable for <br />domestic and irrigation purposes, but usable for stock watering. <br />The Point Lookout Sandstone is located about 275 feet below the mined <br />coal unit. It is unlikely that this formation contributes any water to the <br />mine. <br />Ground water use in the vicinity of the mine is limited. Within none-mile <br />radius of the permit area, one spring and three water wells have been <br />identified. <br />11 <br />