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Require- Requirement Require-ment citation ment complied Comment with ? es/no DRMS previously concluded the Keenesburg Mine does not have the potential to negatively impact ground water and, therefore, a ground water point of compliance is not warranted (Memo to 2004 AHR file, dated 7/6/05). The memo of 7/6/05 also explains that if coal spoil or ash leachate migrated from the pit through eolian sand, Ennis i alluvium, or the Laramie sandstone and coal, attenuation and dispersion would result in levels of TDS and SAR in ground water that are near pre-mining conditions within a few R. Basic Standards CWQCC hundred feet of Keenesburg's pit. The mine monitors water for Ground regulations yes quality in the Ennis alluvium and eolian sand in well DH-96, Water 41.4 and 41.5 located approximately 6,000 ft. downgradient from the mine's pits. Total dissolved solids in DH-96 averaged 1375 mg/I in 2005, well below a 1750 mg/I background level identified in the 7/6/05 memo. Each pit disrupts the potentiometric surface. After final S. Restoration of backfilling, the pits can be expected to show full recovery ground water CDRMS of the potentiomehic surface outside of the pits and water rechazge to regulation yes table (unconfined) conditions inside the pits. No approximate 4.05.11(3) significant formation of surface spoil springs is expected premining rate due to the flat topography; therefore, there will be no loss of round water flows to surface waters. The Probable Hydrologic Consequences section of the permit application predicts no appreciable impacts to T. Prevention of ground water systems outside the permit area. Water adverse impacts CDRMS quality data from well DH-96 indicate there have been no to ground water regulation yes adverse impacts to ground water in the Ennis alluvium and systems outside 4.05.1 I eolian sand outside the permit area, approximately 6,000 ft. the permit area downgradient from the mine's pits. The approved post-mining land use of most of the permit U. Prevention of area is rangeland (a few acres are approved for impacts to commercial/industrial gas well use). As previously ground water CDRMS discussed, ground water in the Ennis alluvium and eolian that adversely regulations yes sand have not been adversely impacted by mining and impact the 4.05.1(2) and reclamation operations at the Keenesburg Mine. Ground postmining land 4.05.11 water in the Laramie coal and sandstone is not likely to have use within the had adverse impacts as explained in the previous discussion permit area of Basic Standards for Ground Water. ~' Page 3