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<br />1.0 INTRODUCTION <br />Ground-water monitoring of the aquifers at the Trapper Mine <br />started in 1974. The ground-water flow regime has been broken up into <br />the major sandstones and coal and adjacent sandstone aquifers. The <br />division of the aquifer systems was selected at clay and shale units <br />which have the potential to retard vertical movement. The Twenty Mile <br />Sandstone is the lowest most aquifer monitored on the Trapper Mine. <br />The U coal seam and adjacent sandstones which are below the R coal <br />seam is the second aquifer monitored. The Q and R coal seams and <br />sandstone between these two coal seams has been labeled the QR <br />aquifer. This is one of the major aquifers of interest because the D <br />and E pits mine the Q and R seams. The R, L, and Mi coal seams and the <br />sandstones which are stratigraphically in this interval are called the <br />RLM aquifer. The RLM aquifer is above the QR aqu:ifer, but below the <br />HI aquifer. The H and i coal seams and sandstone between these two <br />coals has been termed the HI aquifer. The Third (G coal and sandstone <br />below) and Second White (F coal and sandstone below) sandstones each <br />are monitored at this site. The Lewis Shale is also monitored at one <br />• location. The Yampa, Johnson, Pyeatt, and Flume alluvial aquifers are <br />also monitored at this site. <br /> <br />1-1 <br />