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• subfect tracts, The average annual precipitation m_p <br />prepared by the Colorado 1,'aLer Conservation Doard and <br />U,S. Department of P.griculture (1969, figure 5) sho•;s <br />about 16 inches in this general area. Limited precip- <br />itation data collected by Energy Fuels Corporation <br />personnel also indicate about 16 inches, Accordirg:y, <br />the following hydrologic analyses assumes an average <br />annual precipitation of 16 inches, Also, the precipi- <br />tation pattern is typical of the nearby mountain areas <br />where about half the total precipitation falls as s: ow. <br />High-intensity su=mer stor^s are the exception rather <br />than the rule. <br />• All three tracts are underlain by 'essentially the same <br />stratigraphic sequence. Overlying tfie 4iadge coal bed, <br />which would be removed by mining, is an interbeddeC <br />sequence of predominantly fine-grained rocks consis~ing <br />largely of shale and siltstone. This sequence is <br />' relatively impermeable, Comparatively thin sandstcne <br />beds immediately overlying the Fladge coal are moderate- <br />' ly permeable, as is the thick sequence of sandstones <br />underlying the L;adge down to and including the Trout <br />Creeek Sandstone. Virtually ali domestic anC <br />stock-water wells penetrating this sequence obtain <br />their water from sandstone beds below the Wadge coal. <br />_ The Wadge coal itself is not sufficiently permeable in <br /> <br />38 <br />