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<br /> <br />Requirement <br />Require-ment <br />citation Require- ~ <br />ment ' <br />complied <br />with Z <br />es/no' <br /> <br />Comment <br /> The Probable Hydrologic Consequences section (Section <br /> 4.8.3) of Trapper's mining and reclamation permit <br /> discusses the possibility of a high-TDS plume of coal spoil <br /> ~ leachate forming in the 3`d White Sandstone downgradient <br /> from the Trapper Mine in Section 29-T6N-90W. Such a <br /> ' plume would not be expected to Form until several years, <br /> possibly decades, after the pit is reclaimed in the adjoining <br /> ' Section 32. Compared to pre-mining ground water <br /> ~ conditions, such a plume would have elevated dissolved <br />Prevention of <br />T ~ solids. The elevated dissolved solids could possibly impair <br />. ' the use of ground water in the 3'd White Sandstone. The <br />adverse impacts CDMG i <br />~ 3`d White Sandstone is monitored in the area of the possible <br />to ground water regulation yes plume in well GP-9. Monitoring data from that welt <br />systems outside 4,05.1 1 ~ indicate such a plume has not formed. A plausible <br />the permit area ~ alternative interpretation to a plume forming would be that <br /> ~ artesian conditions in the 3`° White will prevent invasion in <br /> the subsurface by spoil leachate as shown in the <br /> spreadsheet attached to DRMS's review memo for the <br /> 2004 AHR. Spoil leachate could invade the alluvium and <br /> ' 3`d White sandstone in Flume Gulch by seeping down into <br /> i the subsurface from spoil springs flowing on the land <br /> surfacesurface in the gulch. These springs will not form <br /> until several yeazs, possibly decades, after the pit is <br /> reclaimed in the Section 32. <br />Page 5 <br />