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• Wells GF-5 and GF-7 are designed to monitor the extent and quality of the re-established water table in <br />backfilled spoils (Map M-52). These wells will determine the occurence of a leachate from the utifily <br />waste in the unlikely event leaching occurs. <br />Welt GF-4 was constructed in August, 1982. This well monitors the I-Seam aquifer north of Ashmore Pit, <br />hydrologicaly down~radient in Johnson Gulch Drainage. We0 GF-8 was installed in August, 1982. It <br />monitors the undisturbed Q seam aquifer just below the north end of Enfield Pit. The Q seam was the <br />lowermost seam to be mined in Enfield Pit. This well will detect changes in groundwater qualRy tram <br />Enfield Pil spoils. Well GF-11 was installed in the north end of the backfilled Enfield Pil following mining, <br />regrading and retopsoiling. Other wells may need to be added to both the Deringer and Enfield Pk areas <br />rf utility waste is disposed. In this event, Division approval wi0 be requested for new wail(s) locations. <br />Four wells at the potential AVF sRe in Pyeatt Gulch are monitored. These wells (P-1, P-3, P-5 and P-8) <br />are perforated in the Pyeatt alluvial, Lewis Shale, sandstone above G coal seam and sandstone below G <br />aquifers, respedivey. Well J-1 was established (September, 1983) in the Johnson drainage alluvium <br />prior to Ashmore Pit entering that drainage. This well moniors for effects to ground water wkhin the <br />potential alluviaVcolluvial aquifer from surface runoff. Its location is shown on map M52. <br />Testing of the restored spoil aquifer is conducted at wells GQ3 (Derringer Pit), GF-5 (Ashmore Pit), and <br />GF-11 (Enfield Pit). Groundwater flow quantities, storage and quality will be determined from these wells. <br />• <br />• <br />4-247 <br />PQ-~} <br />P>1AY 1 3 1999 <br />