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7 <br />alluvium and terrace deposits. These deposits are generally flatlying <br />or dip gently eastward. <br />Only the formations of Late Cretaceous and younger are of interest <br />in this report. In particular the sand overlying the Laramie formation, <br />stream deposits near the east boundary of the site, the Laramie above <br />the .coal and the coal itself are of interest. These formations are <br />exposed or underlie the project area at relatively shallow depths. Since <br />the Laramie-Foxhills aquifer is confined and exists more than 200 ft below <br />the coal seam to be mined, it is expected that it will not be affected by <br />the mining of coal in the overlying Laramie and was, therefore, not of <br />major concern in this study. <br />C. Water Resources <br />Most of the residents in the vicinity of the study area depend on <br />privately owned wells for domestic and livestock purposes. Data collected <br />on 24 wells indicate that 7 of these wells, located in the close proximity <br />of the leasehold, penetrate the stream deposits overlying the Laramie in <br />a broad depression known as Ennis Draw. The remaining 17 wells are <br />apparently completed in the sandstone beds of the Laramie-Foxhills. These <br />wells are generally 4 to 6 inches in diameter. Most of the domestic wells <br />are equipped with a submersible pump driven by an electric motor. Wind- <br />mills power many of the stockwells. The average yield of these wells <br />is about 2 gpm. <br />There is no evidence of surface runoff in the vicinity of the site. <br />Essentially all precipitation apparently infiltrates the highly permeable <br />mantle of sand. No water-formed erosional features are evident, not <br />even small rills or gullys. Ennis Draw is a broad, flat-bottomed <br />depression with no observable channel or gully and shows no evidence <br />