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RECENED <br />JUL 3 0 2,008 <br />01vWYon 01 <br />riactart?atwnMinim and Safety <br />July 28, 2008 <br />Ms. Tania Watson <br />Colorado Department of Public Health and Environment <br />Water Quality Control Division - Permits and Enforcement <br />4300 Cherry Creek Drive South <br />Denver, CO 80222-1530 <br />Phone: (303) 692-3603 <br />Twentymile Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />(970) 879-3800 <br />RE: PERMIT CO-0036684: SECOND QUARTER 2008 DMR SUBMITTAL <br />Dear Ms. Watson: <br />Outfall 001 A flowed each week of the quarter. No permit exceedances were noted. <br />Note that testing for 001W was conducted in May 2008. This test indicated that the effluent was acutely toxic to fathead <br />minnow survival, but not toxic to Ceriodaphnia dubia survival. This appeared odd, since Ceriodaphnia is much more sensitive <br />to toxicity. Two subsequent rounds of accelerated WET testing were conducted in June. Both subsequent accelerated tests <br />easily passed. This may suggest an error relating to the health of the initial fathead minnow supply, or possible lab error. <br />Copies of the WET test reports are attached. <br />Please contact me directly at (970) 870-2750 for any further questions or additional information. <br />Brian A. Watterson, R.G. <br />Geologist, Environmental Group <br />Twentymile Coal Company, <br />Enclosures <br />cc:"DRMS <br />CWPS Permit No. CO-0036684 file