Laserfiche WebLink
1.0 INTRODUCTION <br /> • This report presents the ground-water and surface-water monitoring results for <br /> Trapper Mine for 1998. Significant mine activities during 1998 include continued expansion <br /> of the Ashmore A and Derringer D its and Flintlockpit, which was started in 1997. <br /> Dewatering was conducted in the A, D, F and H pit areas in 1998. Construction of an <br /> additional NPDES site, 020 (Flume), was completed in the Fall of 1998. <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 day <br /> and shale units which have the potential to retard vertical movement. A purple pull-out <br /> index presents the schematic of the aquifer units at Trapper on one side and the basic well <br /> • data table on the other. It is suggested moving this index sheet to the section of the <br /> report 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 Q and/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 KILN 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, and C pits, <br /> 1-1 <br />