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<br />1.0 INTRODUCTION <br />This report presents the ground-water and surface-water monitoring results for Trapper <br />Mine for 2005. Significant mine activities during 2005 include continued expansion of the Flintlock <br />(F~, Gatling (G) and Z pits. Mining was completed in 2002 in the Derringer (D) pit. Dewatering was <br />conducted in the A and F pit areas in 2005. Well dewatering was used in 2005 in the G pit area. <br />Ground-water monitoring of the aquifers associated with Trapper Mine started in 1974. <br />~~ <br />The ground-water flow regime has been divided into the major sandstones and coaUadjacent <br />sandstone aquifers. This division of the aquifer systems was selected at clay and shale units, which <br />have the potential to retard vertical movement. A pull-out index presents the schematic of the <br />aquifer units at Trapper on one side and the basic well data table on the other. It is suggested moving <br />this index sheet to the section of the report being reviewed. Aquifer properties aze presented in <br />Table 2-1 of the 1990 Annual Hydrologic Report. <br />The Twenty Mile Sandstone is the first major sandstone below the mined coal seam at <br /> <br />Trapper Mine. The U coal seam and adjacent sandstones is a minor aquifer between the mined coal <br />seams and the Twenty Mile Sandstone. The Q and R coal seams and sandstone between these two <br />coal seams have been labeled the QR aquifer. This is one of the major aquifers of interest because <br />C, D, E, F, G and Z pits have minedthe Qand/or R coal seams, currently the F and Z pits mine the Q <br />seam. The K, L, and M coal seams and the sandstones, which are stratigraphically in this interval, <br />aze called the KLM aquifer. The F pit mines the I, L, M and Q seams while the G pit mines the H <br />seam and the Z pit mines the I, L, M and Q seams. The KLM aquifer is above the QR aquifer, but <br />below the HI aquifer. The H and I coal seams and sandstone between these two coals have been <br />termed the HI aquifer and have been mined in the A, B, F, G and Z pits, currently the G pit mines the <br />Trapper Mining Company I-1 <br />2005 Annual Report <br />