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Require- <br /> <br />Requirement Requirement <br />citation ment <br />complied <br />Comment <br /> with? <br /> (Yes / no) <br />I Parameters to be <br />sampled at <br /> <br />surface water n/a <br />sites <br />K. Prevention of The approved post-mining land use of most of the permit <br />impacts to surface CDRMS area is rangeland (a few acres are approved for <br />water that regulation es commercial/industrial gas well use). Keenesburg's surface <br />adversely impact 4.05.1(2) y water can be expected to be alkaline and suitable for <br />the postmining rangeland use. <br />land use <br />L. Frequency of CDRMS <br />pond inspections regulation yes <br /> 4.05.9(17) <br />M. Timely filing of CDRMS <br />pond reports regulation yes <br /> 4.05.9(17) <br />N. Content of pond CDRMS <br />reports regulation yes <br /> 4.05.9(17) <br />0. Sampling Page 56 of <br />frequency of CDRMS <br />ground water mining yes Quarterly sampling <br />monitoring wells permit C-81- <br /> 028 <br />P. Parameters to be Page 57 of <br />analyzed in CDRMS Page 57 will need to be updated to add Arsenic, Barium, and <br />ground water p igC 81 yes Cadmium. <br />samples 028 <br />Q. Interim Narrative CWQCC <br />Standard for regulation yes <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 />R. Basic Standards CWQCC dispersion would result in levels of TDS and SAR in ground <br />for Ground Water regulations yes water that are near pre-mining conditions within a few <br /> 41.4 and 41.5 hundred feet of Keenesburg's pit. CEC monitors water <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 2009 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 />Page 2