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• flcdttrln~ar Dam Lurrprrmrroe arul Lnpart . Ln'innmrm fnr rhi li•nnir mrd .~djarnu :Trim' "B" Seam The primary mining ^ctiyite in 1992 occurred in the "B" seam. The B West Mains wero developed an additional 21 crosscuts to the went. The first northwest panel headgate and tailgate developed 26 crosscuts to the north with a bleeder connecting the two which consists of three additional cross- cuts. Five crosscuts of the second northwest headgate were also developed. The first northwest longwall panel was retreat mined six crosscuts southward. • Reluse area wells SG-I and GP-1 continued to show lower levels than in vcars precious to 1937. This is due to persislt-ent lower precipi- tation pauerns. r~ f0~ f L+t ~ c ~ ~ • Reluse area wells GP-3 through GP-~, as in previous years, contained no water. • Barren Member well 35-H-1, as previousW described, was affected by subsidence. This well has since recovered to pre-mining water levels. Mining Activities Planned for 1993 F Seam MCC plans no further mining activities in the F seam. B Seam During 1993, IonGwall panel and mains devel~p- ment and IonSnvall retreat mining will continue. Development of the 2nd Nonhwest panel will be • completed. Longwall mining of this panel is planned to be completed as well. Developmem of the 3rd Northwest panel and most of the dth Northwest panel will also be completed. The B West Mains development will continue westward to the location of the 5th Northwest panel. Water duality Samples taken during 1992 indicate water quality in the mine to he good. Accordingly, 1993 should pose no problem for discharge. The discharges should readily meet NPDES effluent limitations after settling and should not measurably impact receiving waters. Quality of water discharged in 1993 should be similar to the 1992 values shown in Table 5. Groundwater Some groundwater wells exhibited slightly changed conditions in some instances and the subsidence monitoring deep wells showed some influence from mining. Overall however, the wells remained fairly constant compared w previous years. Most notably, the 1992 data indicate: • Barren Member well 323-H-2 has been lost due to blockage problems which occurred after it was installed. The casing wms appar- ently damaged by subsidence as described earlier in this section. • Barren Member well 3<y-H-3 has been lust. Moisture problems with the casing and later communication with the mine workings prob- ably caused by subsidence precluded the determination of water levels. • Barren Member well B-32 exhibited virtually no response to seasonal influences which indicates no apparent connection to surface recharges. • "F'-seam wells SOM-2, and SOM-16 show no seasonal or annual Ouctuation and have little or no surface water connection. • Barren Member wells SOM-l3 and SOM-50 have shown seasonal variations in previous years. During 1957, SOM-50 showed very little or no response to seasonal fluctuation while SOM-l3 was similar to previous years. Since 1955, neither well has shown a respuroc to seasonal fluctuation. The shallow subsidence moni«zing wells, SW-1 through SW-6, were generally the same as in previous years. Lower Refuse Pile During 199'_, mint development waste from the underground mining operations was placed in the lower refuse pile. The lower refuse pile was per- mitted for permanent disposal of some 1.7 million C~