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<br /> Twentymile Coal Company <br />?10 <br />?9 Q 1 ' 29515 Routt County Road # 27 <br />ion of KeCta[nation, Oak Creek, Colorado 80467 <br />uwts <br />and Safety (970) 879-3800 <br />pinin9 <br />January 27, 2010 <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-0027154; DECEMBER/FOURTH QUARTER 2009 DMR SUBMITTAL <br />Dear Ms. Watson: <br />During the month of December 2009, Outfalls 005A/MON5/005W (all same site - Pond D) flowed the last two weeks of the <br />period, allowing two sample sets to be collected. Outfall 008A (Pond G) flowed one week of the period, allowing only one <br />sample set to be collected. No other outfalls flowed during December. No exceedances were noted. <br />During the fourth quarter, in addition to the outfalls above, Outfall 003A flowed every week in October and the first week in <br />November, thus the DMR enclosed for this outfall lists the quarterly results, but has no listings for the monthly <br />(December) entries. Note that Outfalls 002A (Pond T), 004A (Pond C), 006A (Pond E), and 007A,007W,and MON 7 (note all <br />are site Pond F) did not flow during the fourth quarter. <br />Quarterly Whole Effluent Toxicity (WET) tests were collected for analysis for Outfalls 005W during the period. The tests <br />indicated that the effluent were not acutely toxic to Daphnia magna survival (see attached laboratory report). Outfall 007W did <br />not flow during the period and therefore was not tested. <br />Very truly yours, <br />Brian A. Watterson, P.G. <br />Geologist, Environmental Group <br />Twentymile Coal Company <br />enclosures <br />cc: DRMS; CWPS Permit No. CO-0027154 file