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III IIIIIIIIIIIIIIII ~Q~~ `"~ <br />• Doc Date:12/11/2001 <br />1.0 INTRODUCTION <br />This report presents the groundwater and surface-water monitoring result, for <br />Trapper Mine for 2000. Significant mine activities during 2000 include continued expansion <br />of the Ashmore (A), Derringer (D) and Flintlock (F) pits. Dewatering was conducted in the <br />A, D and F pit areas in 2000. No well dewatering was used in 2000. <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 D, E, F and C pits have <br />mined the Qand/or R coal seams, currently the D and F pits mine these seams. The K, L, <br />and M coal seams and the sandstones, which are stratigraphically in this interval, are called <br />the KLM aquifer. The F pit mines the Q and M seams. The KLM aquifer is above the QR <br />aquifer, but below the HI aquifer. The H and I coal seams and sandstone between these <br />two coals have been termed the HI aquifer and have been mined in the A, B, C and H pits, <br />• currently only the A pit mines the H and I coal seams. The 3rd White Sandstone (G coal <br />1-1 <br />