Laserfiche WebLink
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 1994). <br />Holes were drilled in conjunction with the required foundation analyses for the coal processing waste piles. <br />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. <br />Because of the additional data from the exploration holes, the potentiometric map for the Upper Sandstone <br />Facies is felt to be the most reliable. Figure II.C-26 shows that groundwater movement in the Upper <br />Sandstone Facies above the coal follows the trend and dip of the gentle limb of the Red Wash syncline until <br />topographic control takes over near the White River. As a result, a groundwater divide exists and generally <br />follows the northern boundary of the lease area. The figure indicates that recharge to this zone occurs in <br />the topographically higher hills to the west of the lease area and flows toward the alluvium of Scullion <br />• Gulch, Red Wash and the White River. The influence of Scullion Gulch on the movement of groundwater in <br />the area probably results from the channel cutting through the Siltstone and Coal Facies, which underlies <br />the Upper Sandstone Facies. <br />The potentiometric surface map for the Siltstone and Coal Facies (Figure II.C-27), compiled using less data, <br />shows the same basic trends as the map for the Upper Sandstone Facies. In the higher areas to the north, <br />groundwater tends to follow the general geological structure. To the south, the influence of topography and <br />Scullion Gulch redirect the flow of groundwater toward the White River. <br />The potentiometric map of the Lower Sandstone Facies, (Figure II.C-28) using only a limited amount of <br />data, still shows similar general trends of groundwater movement. However, movement appears to be <br />more parallel to the axis of the Red Wash Syncline than noted in the other zones. The southerly portion is <br />still flowing from the high topographic areas toward the White River. <br />Figure II.C-29 showing a composite of Figures II.C-26, 27 and 28, portrays a clockwise rotation of the <br />groundwater divide with depth. The reason for this pattern shift lies in the recharge of the facies. <br />Permit Renewal #3 (Rev. 8/99) II.C-57 <br />