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• 4.05 NYDROLOGIC BALANCE <br />1.0 Surface Water <br />Plans for sediment control structures and surface management <br />practice in the facilities area are contained in section 2.05.3 <br />of the permit (pga. 74-BOc). All structures were sized according <br />to CMLRD criteria. Supporting calculations are correct and <br />complete. <br />The basic elements of the plan include the use of sediment <br />ponds to decrease the total suspended solids concentration of <br />runoff from disturbed areas, revegetation to decrease sediment <br />detachment, diverting runoff above the mine Bite to the natural <br />drainage [o prevent quality degradation, contour ditching above <br />the highwall to minimize floes in this highly erosive area, and <br />use of straw dams in roadside ditches to minimize erosion and <br />collect sediment. <br />2.0 Ground Water <br />There are two possibilities under which the prevailing <br />ground-water balance may be disturbed at the proposed Twin Pines <br />No. 2 Mine. One possibility is disturbing the 2 to 3 foot shale <br />bed separating the underlying aquifer from the Brookside coal <br />seam and the second is disturbing aquifers overlying the coal <br />through subsidence. <br />If, through joints or mine working disturbances, the <br />underlying aquifer and coal seam were to be interconnected, water <br />would enter the mine requiring pumping. Such a situation is <br />reported to have been the case with Caldirola No. 2 mine and <br />apparently many other underground mines in the area. This could <br />lower the present static water level in the area for the aquifer <br />under consideration. <br />• In the case of subsidence taking place, aquifers overlying <br />the Brookside coal can be drained into the nine and again <br />JFSA-81 <br />