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Require- <br />ment <br />Requirement <br />Requirement complied Comment <br />citation <br />with? <br />(yes / no) <br />J. Parameters to be <br />sampled at <br />n/a <br /> <br /> <br />surface water <br />sites <br />K. Prevention of The approved post-mining land use of most of the permit <br />impacts to surface area is rangeland (a few acres are approved for <br />CDRMS <br />water that commercial/industrial gas well use). surface <br />yes <br />regulation <br />adversely impact water can be expected to be alkaline and suitable for <br />4.05.1(2) <br />the postmining rangeland use. <br />land use <br />CDRMS <br />L. Frequency of <br />yes <br />regulation <br /> <br />pond inspections <br />4.05.9(17) <br />CDRMS <br />M. Timely filing of <br />yes <br />regulation <br /> <br />pond reports <br />4.05.9(17) <br />CDRMS <br />N. Content of pond <br />yes <br />regulation <br /> <br />reports <br />4.05.9(17) <br />Page 56 of <br />O. Sampling <br />CDRMS <br />frequency of <br />yes <br />mining Quarterly sampling <br /> <br />ground water <br />permit C-81- <br />monitoring wells <br />028 <br />Page 57 of <br />P. Parameters to be <br />CDRMS <br />analyzed in <br />yes <br />mining <br /> <br />ground water <br />permit C-81- <br />samples <br />028 <br />Q. Interim Narrative CWQCC <br />yes <br />Standard for regulation <br /> <br /> <br />Ground Water 41.5.C.6 <br />DRMS previously concluded the Keenesburg Mine does not <br />have the potential to negatively impact ground water and, <br />therefore, a ground water point of compliance is not <br />warranted (Memo to 2004 AHR file, dated 7/6/05). The <br />memo of 7/6/05 also explains that if coal spoil or ash <br />leachate migrated from the pit through eolian sand, Ennis <br />alluvium, or the Laramie sandstone and coal, attenuation and <br />CWQCC dispersion would result in levels of TDS and SAR in ground <br />R. Basic Standards <br />yes <br />regulations water that are near pre-mining conditions within a few <br /> <br />for Ground Water <br />41.4 and 41.5 CEC monitors water <br />quality in the Ennis alluvium and eolian sand in well DH-96, <br />located several thousand feet downgr <br />pits. The 2011 data for TDS in well DH-96 indicate <br />concentrations below the 1,750 mg/l background level <br />identified in the 7/6/05 memo. There is no evidence that <br />spoil leachate is migrating off site. <br /> <br />Page 2 <br />