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Hydrologic Report (Hydro-Engineering, 1991) presents aquifer properties at Trapper Mine. • <br />The permeabilities from the backfill aquifers are significantly greater than the coal aquifers <br />which they replace. <br />Additional drawdown east of D pit and the overall water-level rise on the west side <br />are the main changes in the QR water-level map at Trapper Mine. Gradients anti flow <br />directions for the QR aquifer in 1996 are similar to those observed in 1995. <br />Map No. 2-2 presents the water-level elevation contours for the HI aquifer in the <br />fall of 1996. Wells GB-5, GC-1, GE-2, GF-4, GP-3, GP-7, and GMP-1 which are completed <br />in the HI aquifer, and backfill wells GF-5 and GF-7, were used in the development of this <br />map. Wells GF-5 and GF-7 are completed in the backfill in the area where the H and I coal <br />seams were mined. Flow in the HI aquifer has been changed mainly near the A, B and C <br />_ pits. The overall flow regime in this aquifer is northerly, similar to that observed in 1995 <br />•. <br />(see Hydro-Engineering, 1996). The ground-water gradient between the backfill aquifer and <br />the un-mined HI aquifer downgradient is relatively flat as it is in the QR backfill. The main <br />change in the HI contours is near the active A pit in the Pyeatt drainage. <br />The 3rd White Sandstone aquifer water-level elevations are presented on Map <br />No. 2-3. Wells GB-2, GC-2, GE-3, P-8, 81-03A, and GP-9 were used in the development <br />of this map. Flow direction in the 3rd White Sandstone is mainly toward the north, as <br />expected. Additional data from wells GE-3 and 81-03A indicate that the 3rd White <br />Sandstone water flows toward the west between these two wells and probably toward a <br />discharge to an adjacent aquifer or to the surface. <br />• <br />2-10 <br />