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• 1.~ INTRODUCTION <br />This report presents the ground-water wind surface-water <br />monitoring results for Trapper Mine for 199:?. 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/ad.)acent 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 blue pull-out index <br />presents the schematic of the aquifer units at T:^apper on one side <br />and the basic well data table on the other. It i.s suggested moving <br />this index sheet to the section of the report being reviewed. <br />The Twenty Mile Sandstone is the lower most aouifer monitored <br />• at Trapper Mine. The U coal seam and adiacent :sandstones are the <br />second aouifer monitored. The 8 and R coal seams and sandstone <br />between these two coal seams have been labeled the OR aouifer. <br />This is one of the ma,ior aquifers of interest br~cause D. E, and C <br />pits mine the 9 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 aouifer is above the 9R 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 z:ouifer. The Third <br />White Sandstone fG r_oal 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 ?yeatt Gulch alluvial aquifers are• monitored at one <br />• site in each of these drainages while the Elume Gulch alluvium is <br />1-1 <br />