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' Annual Hydrology Report <br />April 28, 1988 <br />Page 17 <br />' Some groundwater wells exhibited slightly changed conditions in some instances <br />and the subsidence monitoring deep wells showed some influence from mining. <br />' Most wells remained fairly constant as compared to previous years. <br />A discussion of the wells is as follows: <br />' o Refuse area wells SG-1 and GP-1 showed lower levels than previous years. <br />This is due to lower precipitation amounts in 1987. <br />' o Refuse area wells GP-3 through GP-5, as in previous years, contained no <br />water. <br />' o Well 22-H-1 and 22-H-2 (Barren Member wells) continued to show seasonal <br />fluctuations. Levels remained near those of previous years. <br />o F-seam wells 23-H-3 and 23-H-4 remained at the same levels or increased <br />' slightly. These wells show no seasonal fluctuations. <br />Harren Member well 38-H-1, as previously described was affected by <br />' subsidence. <br />o Barren Member well 38-H-2 continued to have casing blockage problems which <br />' have occurred since it was installed. Very little data was collected at <br />this well due to the problem. The casing was apparently damaged by <br />subsidence as described earlier in this section. <br /> o Barren Member well 38-H-3 provided no useful well data in 1987. Moisture <br />' problems with the casing and later ooimnunication with the mine workings, <br /> probably caused by subsidence, precluded the determination of water levels. <br /> o Barren Member wells B-32, SOM-1, 45-H-1 and 45-H-2 exhibited sporadic or <br /> small responses to seasonal influences which indicates a limited but <br /> apparent connection to surface recharges. <br /> <br /> o F-seam wells C-76, SCI--2, and SOM-16 show no seasonal or annual fluctuation <br /> and have little or no surface water connection. <br />' o Barren Member wells SOM--13 and 51-80 have shown seasonal variations in <br /> previous years. During 1987, SC1M-80 showed very little or no response to <br /> seasonal fluctuation while SOM-13 was similar to previous years. <br /> o Wells A-1, A-2, and A-3 are located along the margins of creeks and exhibit <br /> seasonal fluctuations. The wells are shallow (less than 65 feet deep). <br /> <br /> o The shallow subsidence monitoring wells, SW-1 through SW-6 were the same as <br /> previous years. SW-2 contains a minimal amount of water which remains <br />' static. <br /> well water level hydrographs for 1979 to 1987 are contained in Appendix C. <br />1 <br /> <br />