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<br />ENERGY COMPANY <br />March 9, 2011 <br />Mr. Robert Zuber <br />Division of Reclamation, Mining & Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Re: Correction Submittal <br />Annual Hydrology & Reclamation Report <br />Keenesburg Mine, Permit C-1981-028 <br />Dear Mr. Zuber: <br />,??$ safs'?f <br />This letter and the enclosed page revision provide a follow-up to your email correspondence (03/03/11). <br />You were correct to question the water quality parameters list submitted with the 2010 AHR Report <br />document. A brief review of the genesis of the confusion follows. <br />M ??noY <br />When sisal Revision was prepared and submitted to allow for the disposal of "mine waste <br />rock" at the Keenesburg site (1998), one of the conditions of approval (either from the Division, or as <br />part of the "certificate of designation" from Weld County) was that Barium be added to the list of <br />parameters in the groundwater monitoring plan. Then, in March 2000, the Environmental Protection <br />Agency (EPA) came out with a preliminary determination relative to the regulation of ash from the <br />combustion of fossil fuels. At the suggestion, and with the approval of the Environmental Protection <br />Specialist, it was determined that arsenic and cadmium should be included in the list of parameters. <br />This would allow for the development of background data before the new EPA regulations became <br />effective. Thus, all three of the added parameters should be referenced in the AHR reports from 2001 <br />through 2009. <br />In 2010, as our information technology staff migrated company files from one database to another, they <br />were supposed to bring all of the storage drives. Unfortunately, the one that contained the entire file <br />system for the AHR "dropped off' somewhere along the way. When we went to prepare this year's <br />(2010) report, the files had disappeared. The drive could not be located, or recreated, so we were <br />forced to go back to a 2000 file that had been stored (off system), reinstall it, and bring virtually all of <br />the data forward, or recreate it from there. Because the 2000 file didn't contain two of the three <br />subsequently added parameters, the printing of the 2010 AHR report also omitted them. We hope that <br /> <br />P.O.BOX 467 GOLDEN, COLORADO 80402