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• 2.4.2 Groundwater Inflow During Mining 2-43 <br />Prior to the first permit term, numerous drill holes were drilled to an average <br />depth of 50 feet below the Cameo Coal Seam with virtually no water inflow realized and <br />practically no retention capability. The results of geophysical log interpretations in two <br />exploration boreholes (Appendix G) confirm the absence of water inflow potential. <br />Borehole 7.21-3, was located on the west side of the coal storage yard. The hole was <br />collared about ten feet below the Cameo seam and was dry to the depth of 200 feet <br />from the surface. This indicates that saturated sandstone strata are about 210 feet <br />below the Cameo Coal Seam and therefore beyond any possible impact caused by <br />mining activities. Borehole 7-15-3-3, located in the southwest quarter of Section 15, just <br />northeast of the permit boundary, was drilled about 38 feet below the Cameo Coal <br />Seam and was dry. Minor amounts of groundwater were encountered while mining in <br />the graben and additional water was encountered in the East Mains. Since the mine is <br />generally progressing downdip, these inflows are pumped from the mine or used in the <br />• mining process. A detailed analysis of the inflows and the probable hydrologic <br />consequence of the mining operation are contained in Appendix N and in Section <br />2.4.2.1. Annual Hydrology Reports submitted to the Division are also useful when <br />determining and monitoring any impact the operation may have on the hydrology of the <br />area. <br />The location of the mine water discharge point (CDPS Outfall) is shown on <br />Figure 2.2-2. The CDPS outfall is located north of the crushing and screening <br />structure. Mine water is discharged into a culvert that conveys the flow under the portal <br />bench and into McClane Creek. McClane Creek flows into East Salt Creek at a location <br />approximately 400-feet south of the East Salt Creek bridge. <br />All water discharges will be in accordance with CDPS permit (CO-0038342). <br />Results of sample analysis will be submitted to DRMS as part of the quarterly reporting <br />requirements. <br />n <br />U <br />TR-16 Mc-Volume 1 2/09 <br />