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• Hydrologic Data Interpretarion and Impact A.ssevmenr for Permit Ama and Adjacmi Arew <br /> West Submain adjacent to the panel. However, "B" Seam Slopes <br /> pumping was unnecessary. <br /> Development of the"B"seam slopes is expected to <br /> Panel 1W6S start during the second quarter of 1990.Water may <br /> be encountered during this development.However, <br /> flows are expected to be minimal. If pumping is <br /> Mining of this panel began during 1989. Panel required, the water will be delivered to pond <br /> 1W6S is under an average of about 350 feet of MB-1. <br /> overburden. Due to the trend of decreasing cover <br /> and thinning coal with westward expansion, this Water Quality <br /> panel may be the last panel to the west driven off <br /> the 1st West Submain. Hydrologic conditions in Samples taken during 1989 indicate water quality <br /> this panel are similar to the other panels off the <br /> to the mine to be good.Accordingly,it should pose <br /> 1st West Submain. The panel is mostly dry. A few <br /> very small localized damp roof areas or roof drips re problem for discharge. The discharges should <br /> readily meet NPDES effluent limitations after <br /> have occurred. settling and should not measurably impact receiv- <br /> ing waters. Quality of water discharged in 1990 <br /> 1st East Submain should be similar to the 1989 values shown in <br /> Table 5. <br /> The 1st East Submains were retreat mined and Groundwater <br /> sealed during the first half of 1989. Poor roof <br /> conditions (fractures,water,and weak rock mater- <br /> ial)were the major reasons for retreat mining this <br /> • submain section. Although increased flows may conditions in some instances and the subsidence <br /> occur following subsidence, they are not expected monitoring deep wells showed some influence from <br /> to be significant. No flows have developed to date. mining. Overall, the wells remained fairly constant <br /> compared to previous years. Most notably, the <br /> 1989 data indicate: <br /> An alternative access submain to coal in the <br /> eastern portion of Federal Lease C-1362 is • Refuse area wells SG-1 and GP-1 <br /> planned. Placement of this submain would be continued to show lower levels than <br /> further to the south under higher overburden and in years previous to 1987. This is due <br /> further from the fracture zones associated with the to persistent lower precipitation pat- <br /> branches of Sylvester Gulch. Due to plans to terns. <br /> access the"B"scam, this submain is unlikely to be <br /> driven for several years. • Refuse area wells GP-3 through GP-5, <br /> as in previous years, contained no <br /> Northwest Submains and Associated water. <br /> Panels • Barren Member well 38-H-1,as previ- <br /> ously described,was affected by subsi- <br /> The opening of the Northwest Submains and three dence. This well has since recovered <br /> associated panels is planned for 1990. The sub- to pre-mining water levels. <br /> mains would strike out from the Southwest Main <br /> Intakes (Exhibit 111). Some water is expected be- • Barren Member well 38-H-2 contin- <br /> cause colluvium is located above this area. Also, ued to have casing blockage problems <br /> cover over the panels is low to moderate.However, which occurred after it was installed. <br /> no significant flows or hydrologic impacts are Very little data were collected at this <br /> anticipated. well due to the problem. The <br /> • <br /> 10 <br />