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1.0 INTRODUCTION <br />This report presents the ground-water and surface-water monitoring results for <br />Trapper Mine for 2001. Significant mine activities during 2001 include continued expansion <br />of the Ashmore (A), Derringer (D) and Flintlock (F) pits. Mining was started in 2001 in the <br />G and Z pits. Dewatering was conducted in the A, D and F pit areas in 2001. No well <br />dewatering was used in 2001. <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 welt 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 D, E, F, G and C 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 stratigraphicaliy in this interval, are <br />called the KLM aquifer. The F pit mines the Q and M seams while the G pit mines the L, M <br />and Q seams. The IQ_M aquifer is above the QR aquifer, but below the HI aquifer. The H <br />and I coal seams and sandstone between these two coals have been termed the HI aquifer <br />1-1 <br />