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June 28. 2013 <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; May 2013 DMR SUBMITTAL <br />Dear Ms Watson: <br />Twentymile Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />(970) 879 -3800 <br />JUL 0 3 2013 <br />OF RECTA AMO" <br />During the month of May 2013, Outfalls 002A (Pond T), 003A (Pond B), 005A/005W /MON 5 (all Pond D), 006A (Pond E), <br />007A/007W /MON 7 (all Pond F), and 008A (Pond G) flowed Outfall 004A (Pond C) did not flow during the month. <br />Outfall 002A (Pond T) flowed only during the first week of the month. Outfalls 003A (Pond B) and 005A /005W /MON 5 (all <br />Pond D) flowed each week of the month. 006A (Pond E) flowed the first three weeks of the month. Outfall 007A/007W /MON <br />7 (all Pond F) flowed only during the second week of the month. Outfall 008A (Pond G) flowed during the first two weeks of <br />the month. <br />There were two exceedances at Outfall 003A for total suspended solids (TSS) for 7 day maximum and 30 day average. The <br />TSS values for each week of the month were 13, 118, 65, and 37mg /L respectively. The first week of June was 18 mg /L. The <br />site subsequently stopped flowing the second week in June, to date. The high value may have been related to sediment <br />disturbance during sampling, and higher values during spring melt flushing. <br />Note that 005W and 007W are reported on a quarterly basis, and will be reported with the June 2013 DMR submittal. <br />Please call me directly- (970) 870 -2750 with any questions. <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 <br />