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<br />subject tracts. The average annual precipitation map <br />prepared by the Colorado Water Conservation Board and <br />U.S, Department of Agriculture (1969, figure 5) shows <br />about 16 inches in this general area. Limited precip- <br />itation data collected by Energy Fuels Corporation <br />personnel also indicate about 76 inches, Accordingly, <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 snox, <br />High-intensity summer storms are the exception rather <br />than the rule. <br />All three tracts are underlain by essentially the same <br />stratigraphic sequence. Overlying the Wadge coal bed, <br />xhich would be removed by mining, is an interbedded <br />sequence of predominantly fine-grained rocks consisting <br />largely of shale and siltstone, This sequence is <br />relatively impermeable. Comparatively thin sandstone <br />beds immediately overlying the Wadge coal are moderate- <br />ly permeable, as is the thick sequence of sandstones <br />underlying the Wadge down to and including the Trout <br />Creeek Sandstone, Virtually all domestic and <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 />38 <br />