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I ~ 1.0 INTRODUCTION <br />This report presents the ground-water and surface-water monitoring results for <br />Trapper Mine for 2002. Significant mine activities during 2002 include continued expansion <br />of the Ashmore (A}, Flintlock (F), Gatling (G) and Z pits. Mining was completed in 2002 in <br />the Derringer (D) pit. Dewatering was conducted in the A and F pit areas in 2002. Well <br />dewatering was used in late 2002 in the G pit area. <br />Ground-water monitoring of the aquifers associated with Trapper Mine started in <br />1974. The ground-water flow regime has been divided into the major sandstones and <br />coal/adjacent sandstone aquifers. This division of the aquifer systems was selected at clay <br />and shale units, which have the potential to retard vertical movement. A pull-out index <br />presents the schematic of the aquifer units at Trapper on one side and the basic well data <br />table on the other. It is suggested moving this index sheet to the section of the report <br />being reviewed. Aquifer properties are presented in Table 2-1 of the 1990 Annual <br />Hydrologic Report. <br />The Twenty Mile Sandstone is the lower-most aquifer monitored at Trapper Mine. <br />The U coal seam and adjacent sandstones are the second aquifer monitored. The Q and <br />R coal seams and sandstone between these two coal seams have been labeled the QR <br />aquifer. This is one of the major aquifers of interest because C, D, E, F and G pits have <br />mined the Qand/or R coal seams, currently the D, F and G pits mine these seams. The K, <br />L, and M coal seams and the sandstones, which are stratigraphically in this interval, are <br />called the KLM aquifer. The F pit mines the Q and M seams while the G pit mines the H, L, <br />M and Q seams. The KLM aquifer is above the QR aquifer, but below the HI aquifer. The <br />H and I coal seams and sandstone between these two coals have been termed the HI <br />1-1 <br />