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iii iiiiuiiiiiii iii <br />a99 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman SI., Room 215 <br />Denver, CO 80203 <br />Phpne'. (303) 866-3567 <br />FAX: (3071 832-8106 <br />To: <br />From: <br />Date: <br />Re: <br />Bazbara Pavlik, Environmental Protection Specialist <br />Bruce Stover, Technical Support ~~- <br />February 28, 1994 j <br />C-81-018, NOV C-93-156, Compaction Testing Pilot Study, Waste Pile 4: <br />pF' COQ <br />tip, <br />He <br />• [~ <br />~~ <br />ret6 ~ <br />Roy Romer <br />Governor <br />Michael B. Long <br />Drvi~ion Duecmr <br />I have reviewed the additional materials you gave me on the pilot testing procedure for the <br />proposed compaction testing program for the Deserado pile No. 4. It is unclear to me what was <br />actually done, or where the pilot testing locations were. I am also confused and a little <br />concerned by the "erroneous moisture readings" the equipment is reported to have generated. <br />A report needs to be written which clearly describes and documents the pilot testing <br />procedures, including the assumptions regarding erroneous instrument readings, and identifies <br />test locations to a higher degree than the one confusing paragraph you showed me. I previously <br />outlined the procedures which we requested be carried out in my memo of January 24, and we <br />verbally discussed these issues at the meeting with the operator on January 12. At this time, <br />I still have questions regarding the reliability of the pilot test data. Further, once the pilot test <br />data is verified, testing still needs to be carried out at random locations on the pile selected by <br />the Coal Program Staff. The pilot study was not intended to demonstrate overall compaction <br />results for the pile, but to assure that we would be getting accurate test results from the method <br />proposed. <br />Based on the confusion this whole approach seems to be creating for both us and the operator, <br />it may be more desirable to simply require test drilling of the piles in order to accurately <br />determine compaction/density values. <br />xc: Larry Routten M:\IMP\BR$\DESPILOT.MEM <br />