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Twentymile Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />(970) 879-3800 <br />JED <br />,E,1% <br /> <br />January 27, 2010 ad Sd* <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 />RE: PERMIT CO-0036684; FOURTH QUARTER 2009 DMR SUBMITTAL <br />Dear Ms. Watson: <br />Outfall 001A (site 62) flowed each week of October and November, and the first week of December. No permit exceedances <br />were noted. <br />Note that WET testing for 001 W was conducted in October 2009. This test indicated that the effluent was not acutely toxic to <br />fathead minnows, but was toxic to Ceriodaphnia dubia survival. Accelerated testing was subsequently conducted. Three <br />accelerated -tests passed. Copies of the WET test reports are attached. <br />Please con tact m 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: DBMS CWPS Permit No. CO-0036684 file