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n <br />LJ <br />1.0 INTRODUCTION <br />This report presents the ground-water and surface-water <br />monitoring results for Trapper Mine for 1987. Ground-water monitoring <br />of the aquifers at Trapper Mine started in 1974. The ground-water <br />flow regime has been broken up into the major sandstones and coal and <br />adjacent sandstone aquifers. The division of the aquifer systems was <br />selected at clay and shale units which have the potential to retard <br />vertical movement. Table 1-1 presents basic well data for the current <br />Trapper monitoring wells. Figure 1-1 presents a schematic of the <br />aquifer units at Trapper Mine. The Twenty Mile Sandstone is the lower <br />most aquifer monitored at Trapper Mine. The U coal seam and adjacent <br />• sandstones which ar coal seam is the second aquifer monitored. The Q <br />and R coal seams and sandstone between these two coal seams has been <br />labeled the QR aquifer. This is one of the major aquifers of interest <br />because both D and E pits mine the Q and R seams. The R, L, and M <br />coal seams and the sandstones which are stratigraphically in this <br />interval are called the RLM aquifer. The KLM aquifer is above the QR <br />aquifer, but below the HI aquifer. The H and I coal seams and <br />sandstone between these two coals has been termed the HI aquifer. The <br />Third (G coal and sandstone below) and Second White (F coal and <br />sandstone below) sandstones each are monitored at this site. The <br />Lewis Shale is also monitored at one location. The Yampa, Johnson, <br />Pyeatt, and Flume alluvial aquifers are also monitored at this site. <br />• The 1986 hydrologic monitoring report, Hydro-Engineering (1987), <br />1-1 <br />