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• 1.0 INTRODUCTION <br />This report presents the ground-water and surface-water monitoring results for <br />Trapper Mine for 2003. Significant mine adivities during 2003 indude continued expansion <br />of the Ashmore (A), Rintlock (F), Gaffing (G) and Z pits. Mining was completed in 2002 in <br />the Derringer (D) pit. Dewatering was oondud~d in the A, F, G and Z pit areas in 2003. <br />Well dewatering was used in 2003 in the G pit area. <br />Ground-water monitoring of the aquifers assodated wdh Trapper Mine started in <br />1974. The ground-water flow regime has been dniided into the major sandstones and <br />coal/adjacent sandstone aquifers. This division of the aquifer systems was seled~d at day <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 bwer-most aquifer monitored at Trapper Mine. <br />The U coal seam and adjacent sandstones are the second aquifer monitored. The Q and R <br />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 F and G pits mine these seams. The ~ L, <br />and M coal seams and the sandstones, which are stratigraphiplly in this interval, are called <br />the ~ aquifer-. The F pit mines the M and Q seams while the G pit mines the H, L, M and <br />Q seams. The la.M aquifer is above the QR aquifer, but below the HI aquifer. The H and I <br />coal seams and sandstone between these two coals have been termed the HI aquifer and <br />1-i <br />