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<br />i;"')' <br />\.;,.'.-;t.- , <br />'-.\-,- <br /> <br />,~""',::'I>-. <br />) <br /> <br />"'=' <br />C\.l <br />LIJ <br /> <br />materials and the general patterns of <br /> <br />~round~water flow through these materials <br /> <br />will also be evaluated. The concentrations <br /> <br />of selected trace elements in the coal and <br /> <br />ash are presented in Table 21, and compared <br /> <br />with the concentrations found in Montana <br /> <br />and Wyoming coals. <br /> <br />2.2.3 Effects of Mining on Groundwater <br /> <br />Because the overburden in the mining area <br /> <br />will be much more permeable after stripping <br /> <br />and redeposit than it was when in place, <br />changes are likely to occur in the rate <br /> <br />of groundwater recharge to the aquifers in <br /> <br />the Twentymile Sandstone member of the <br /> <br />Williams Fork Formation. The mining <br /> <br />activity will be centered near the expo- <br /> <br />sures of the Twentymile Sandstone, where <br /> <br />most of the recharge occurs. Assuming that <br /> <br />the mining will result in increased ponding <br /> <br />and retention of surface water, recharge <br /> <br />of groundwater can be expected to increase. <br /> <br />This effect ,can be controlled, if necessary, <br /> <br />by careful design of su'rface water storage <br /> <br />and (lralnar~(' rac.1.11.tJe~,. IUnor chanp;N, <br /> <br />in r;roundwnter quality are also expected, <br /> <br />pr6ducing slightly increased yields of <br /> <br />-14Ij- <br />