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~~ • • <br />Ground Water <br />Water table maps indicate that, though there is the physical <br />i possibility of hydraulic connection between the alluvium of <br />Mann Draw and the mined Coalmont Formation, the Coalmont is <br />not recharging the alluvium. Recharge 'to the alluvium <br />apparently occurs during surface flow events in Mann Draw. <br />Discharge from the alluvium of Mann Draw is to the alluvium <br />of the Canadian River. Present mining plans call for <br />avoidance of Mann Draw and physical connection which will <br />minimize the effect of the mining operations on Che alluvium. <br />The general recharge, discharge and storage characteristics <br />of the Coalmont are discussed in another section of this <br />.. permit. More specifically, the Coalmont at the mine area is <br />recharged by downward percolation of rainfall and snowmelt. <br />The area of outcrop of the Coalmont on the property is less <br />than 160 acres. 'The outcrop area of the Coalmont in the <br />region shown on Figure 6 (which covers only a small part of <br />North Park) is over 40,000 acres. The outcrop on the Bourg <br />Mine represents less than 1J2 percent of the recharge area of <br />the Coalmont Formation. The Coalmont has discontinuous shale- <br />sand-coal zones throughout its 4,500 foot thickness broken by <br />faulting and folding. The water table map of Plate 1 <br />reflects this discontinuity of the Coalmont as an aquifer and <br />indicates that mining in the Coalmont will have a very <br />localized effect on water levels and will have little effect <br />on the Coalmont as a whole. <br />A conservative estimate of stored water in the Coalmont of <br />the Bourg property is 2 acre-feet of removable volume (using <br />a specific yield of 10 percent). During mining operations, <br />this volume of water will be removed from the hydrologic <br />Leonard RiceConsuriingWaterEngineers.Inc. <br />2-38 <br />