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Twentymile Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />(970)879-3800 R~.~~~IVE® <br />NOV tl 12006 <br />Division nr "=~~~mation, <br />Mining ono 3efety <br />October 27, 2006 <br />Mr. Raymond Nalepa <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 />RE: PERMIT CO-0036684: 2nd QUARTER 2006 DMR SUBMITTAL <br />Dear Mr. Nalepa <br />Please find enclosed the above referenced discharge monitoring reports for the period from July 1, 2006 through September <br />30, 2006. Outiall 001A (62 FCT) flowed each week of the period. No permit limitation exceedences were noted (with <br />exception of the quarterly WET test, see paragraph below) during the period. <br />A Quarterly Whole Effluent Toxicity (WET) test was conducted for Outfall 001W on August 1, 2006. Test results indicated that <br />the effluent was not acutely toxic to fathead minnow survival, but was acutely toxic to Ceriotlaphnia dubia survival. This <br />resulted in TCC conducting two accelerated WET tests on August 15 and 23`tl 2006. Both of the subsequent tests passed for <br />C. Dubia survival, putting TCC back in compliance. Copies of the WET Test Report Forms are included with this submittal. <br />Results on DMR reflects the final passing percentages. <br />Please contact me directly at (970) 870-2750 for any further questions or additional information <br />Brian A. Watterson, P.G. <br />Geologist, Environmental Group <br />Twentymile Coal Company, <br />Enclosures <br />cc: DMG <br />CWPS Permit No. CO-0036684 file <br />