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Requirement <br />Requirement <br />citation <br />Reviewed <br />Comment <br />J. Parameters to be <br />sampled at <br />n/a <br />surface water <br />sites <br />K. Prevention of <br />The approved post- mining land use of most of the permit <br />impacts to surface <br />CDRMS <br />area is rangeland (a few acres are approved for <br />water that <br />regulation <br />commercial /industrial gas well use). Keenesburg's surface <br />adversely impact <br />4 05.1(2) <br />yes <br />water can be expected to be alkaline and suitable for <br />the postmining <br />rangeland use. <br />land use <br />L. Frequency of <br />CDRMS <br />pond inspections <br />regulation <br />yes <br />4.05.9(17) <br />M. Timely filing of <br />CDRMS <br />pond reports <br />regulation <br />yes <br />4.05.9(17) <br />N. Content of pond <br />CDRMS <br />reports <br />regulation <br />yes <br />4.05.9(17) <br />O. Sampling <br />Page 56 of <br />frequency of <br />CDRMS <br />ground water <br />mining <br />yes <br />In 2012, quarterly sampling was required. <br />monitoring wells <br />permit C -81- <br />028 <br />P. Parameters to be <br />Page 57 of <br />analyzed in <br />CDRMS <br />ground water <br />mining <br />yes <br />samples <br />permit C -81- <br />028 <br />Q. Interim Narrative <br />CWQCC <br />Standard for <br />regulation <br />yes <br />Ground Water <br />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 />dispersion would result in levels of TDS and SAR in ground <br />R. Basic Standards <br />CWQCC <br />water that are near pre - mining conditions within a few <br />for Ground Water <br />regulations <br />yes <br />hundred feet of Keenesburg s pit. CEC monitors water <br />41.4 and 41.5 <br />quality in the Ennis alluvium and eolian sand in well DH -96, <br />located several thousand feet downgradient from the mine's <br />pits. The 2012 data for TDS in well DH -96 indicate <br />concentrations below the 1,750 mg/1 background level <br />identified in the 7/6/05 memo. SAR levels reported for 2012 <br />are within the range of background values; but generally <br />below these values at this well. It does not appear that spoil <br />leachate is migrating off site. <br />Page 2 <br />