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April 27, 2012 <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; MARCH 2012 and FIRST QUARTER 2012 DMRS <br />Dear Tania: <br />\ JOO <br />h A t no <br />Twentymile Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />(970) 879 -3800 <br />During the months of January and February 2012, no Outfalls discharged. This may have been the result of limited snow fall <br />and low temperatures. During the month of March, Outfall 005A, 005W, MON5 (all Pond D) flowed each week of the month. <br />Outfalls 003A and 006A flowed the last two weeks in March. Outfalls 002A (Pond T), 007A/007W /MON7 (all Pond F), and <br />outfall 008A flowed only one week during March. Outfall 004A did not flow during the period. <br />In March, there were two exceedances at Outfall 005A, for total recoverable iron, which included the 30 day max, and 30 day <br />average. This may have been a result of erosion from the initial spring snow melt. There were no other exceedances. Also <br />note that the wrong analytical list was requested for metals for Outfall MON -7. As a result, we ran several metals that are not <br />required in the permit, and omitted four that are required (arsenic, chromium, lead, and nickel). I've attached the lab report for <br />the analyses that were run. <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 />