Laserfiche WebLink
8 <br />• of the existence of surface flows. <br />The thickness of the blow sand overlying the Laramie is variable but <br />is sufficient to hold a large quantity of capillary water. This observa- <br />tion, coupled with the small annual precipitation relative to the poten- <br />tial evapotranspiration, makes it unlikely that significant recharge to <br />the Laramie through the sand exists. This sand is not known to yield <br />water to wells except in conjunction with the stream deposits in Ennis <br />Draw. <br />Ground water exists in the coal seam of interest and in the over- <br />burden. The saturated thickness of the overburden is some 65 ft. Lateral - <br />movement of this water is toward the northeast in the study area and <br />undoubtedly discharges into the sands and stream deposits in Ennis Draw <br />• to the north and east of the project site. Ground water in neither the <br />coal,aor overburden is known to provide a water supply for any purpose <br />in the study area. - ' <br />III. Pre-hlining Subsurface Hydrology and Water Quality in Detailed Study <br />Site <br />A. Geology <br />A map of the study area is shown in Figure 3. The study site covers <br />about six square miles and includes Sections 25, 26, 35, and 36. The <br />land is gently sloping to the northeast toward Ennis Draw which is located = <br />on the eastern boundary of the study area and generally runs in a north- <br />south direction. - <br />A preliminary look at geophysical logs suggested that it would be - <br />• impractical to identify individual aquifers in the overburden sequence. <br />/ {- <br />It was, therefore, decided to treat the coal, overburden and the over- <br />lying sand as individual potential aquifers. An east-west cross-section <br /> <br />