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The fresh-water zone extends to an unknown depth, where the ground water probably <br />becomes saline. However, the aquiferous units below the Twentymile Sandstone are <br />not greatly significant to this study because the relative high permeability of <br />this unit will prevent impacts from extending beyond its boundaries. <br />The following four sections discuss each of the hydrogeologic units which are <br />significant to this study. This section presents we 11 completions, aquifer <br />descriptions, aquifer coefficients, well capacities, and similar information for <br />each geologic unit. Table 2.7-20 presents the basic well data while Table 2.7-21 <br />gives [he aquifer properties. <br />Twencymile Sandstone <br />The Twentymile Sandstone is a relatively clean (clay-free) sandstone that was <br />deposited in a beach and barrier bar environment. This unit has a relatively <br />high porosity and permeability, and it is the best aquifer in the Trapper Mine <br />Area. <br /> <br />2-4 55 a <br />REVISED FEB 1 3 '87 <br />