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"• 1.0 INTRODOCTION <br />This report presents the ground-water and surface-water <br />monitoring results for Trapper Mine for 1991. Ground-water <br />monitoring of the aquifers associated with Trapper Mine started in <br />1974. The ground-water flow regime has been divided into the major <br />sandstones and coal/adjacent sandstone aquifers. This division of <br />the aquifer systems was selected at clay and shale units which have <br />the potential to retard vertical movement. A newly designed blue <br />pull-out index is provided this year. This index presents the <br />schematic of the aquifer units at Trapper on one side and the basic <br />well data table on the other.. It is suggested moving this index <br />sheet to the section of the report being reviewed. <br />• The Twenty Mile Sandstone is the lower most aquifer monitored <br />at Trapper Mine, The U coal seam and adjacent sandstones are the <br />second aquifer monitored. The Q and R coal seams and sandstone <br />between these two coal seams have been labeled the QR aquifer. <br />This is one of the major aquifers of interest because D. E, and C <br />pits mine the Q and R coal seams. The K, L and M coal seams and <br />the sandstones which are stratigraphically in this interval are <br />called the KLM aquifer. The KLM aquifer is above the QR aquifer, <br />but below the HI aquifer. The H and I coal seams and sandstone <br />between these two coals have been termed the HI aquifer. The Third <br />White Sandstone (G coal and sandstone below) and Second White (F <br />coal and sandstone below) Sandstone are monitored at seven <br />locations. The Lewis Shale is also monitored at one location. The <br />~~ Johnson and Pyeatt Gulch alluvial aquifers are monitored at one <br />1-1 <br />