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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 n/a <br />surface water <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 commercial/industrial gas well use). Keenesburg's surface <br />adversely impact regulation yes <br />water can be expected to be alkaline and suitable for <br />the postmining 4.05 <br />.1(2) 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 />regulation <br />yes <br />pond reports 4.05.9(17) <br />N. Content of pond CDRMS <br />regulation <br />yes <br />reports 4.05.9(17) <br />0. Sampling Page 56 of <br />frequency of CDRMS <br />mining <br />yes <br />Quarterly sampling <br />ground water permit C-81- <br />monitoring wells 028 <br />P. Parameters to be Page 57 of <br />CDRMS <br />There is an apparent error in the table on page 39. The key <br />analyzed <br />a mining yes appears to be reversed (e.g., "a" should equal metals lab <br />ter <br />ground <br />wat permit C-81- report). <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 /> dispersion would result in levels of TDS and SAR in ground <br />R. Basic Standards CWQCC water that are near pre-mining conditions within a few <br />for Ground Water regulations yes hundred feet of Keenesburg's pit. The mine monitors water <br /> 41.4 and 41.5 quality in the Ennis alluvium and eolian sand in well DH-96, <br /> located approximately 6,000 ft. downgradient from the <br /> mine's pits. Multiplying conductivity by 73.6% to derive <br /> TDS, the concentration of TDS in well DH-96 averaged <br /> approximately 1,303 mg/l in 2008. (The 73.6% conversion <br /> factor is based on the observed relationship between field <br /> conductivity and lab samples from the DH-96 well.) The <br /> 2008 TDS values are well below a 1,750 mg/l background <br />Page 2