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Core holes were drilled in the refuse disposal areas up to 43 feet in depth. None of these holes <br />• encountered groundwater. Logs and other information regarding these holes are contained in Illustration <br />21. <br />A groundwater monitoring well (RM-1) was installed adjacent to the refuse disposal area. This well was <br />drilled to bedrock. This well was dry at the time it was drilled and has remained dry to date (January <br />1994). Holes were drilled in conjunction with the required foundation analyses for the coal processing <br />waste piles. After these holes were drilled, the groundwater information obtained were submitted. <br />II.C.3.d Groundwater Movement Groundwater movement in the lease and adjacent areas was <br />determined through the construction of potentiometric surface maps of the three bedrock zones. Table <br />II.C-10 lists the data used to construct these maps. This data set represents information obtained from <br />monitoring wells with adequate history to establish a basis for static water levels. Given the tightness of <br />the formations and slow recovery of the system, properly constructed and longer term monitoring of these <br />wells provided more dependable data than short term monitoring of exploration drill holes originally used. <br />Figures II.C-26, 27 and 28 show that groundwater movement in the three bedrock zones follows the trend <br />and dip of the Red Wash syncline until geologic and topographic influences of the axis of the Red Wash <br />syncline, lower Scullion Gulch, lower Red Wash, and the White River take over. As a result, a <br />groundwater divide exists and generally follows the northern boundary of the lease area. The figures <br />• indicates that recharge to these zones occurs in the topographically higher hills to the west of the lease <br />area and flows toward the alluvium of Scullion Gulch, Red Wash and the White River. The influence of <br />Scullion Gulch on the movement of groundwater in the area probably results from the channel cutting <br />through the Siltstone and Coal Facies, which underlies the Upper Sandstone Facies. <br />• Permit Revision #6 (3/2008) II.C-5 7 <br />