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Peabody <br />Twentymile Coal Company <br />29515 Routt County Road #27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />July 28, 2010 <br />??of <br />PSG C <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 />C-tq32--056 <br />RE: PERMIT CO-0042161; SECOND QUARTER 2010 DMR SUBMITTAL <br />Dear Ms. Watson: <br />Please find enclosed the above referenced discharge monitoring reports for the period April 1, <br />2010 through June 30, 2010, for Outfalls 001 A/001 W/MON 1 (all site 115), and 002A (sites 300E <br />and 3001). Outfall 001A/001W did not discharge during the period. Attached are blank DMRs for <br />this Outfall with the No Discharge box checked. <br />Outfalls 3001 and 002A flowed each week of the period. Two exceedances were noted for 002A, <br />the 30 day average for sulfate in June was 540 mg/I versus the limit of 250 mg/L. The reason for <br />this anomaly is not clear, as we rarely have elevated sulfate concentrations at this site. Note that <br />the April sample for sulfate was 43.4 mg/L and the May sample was 43.4 mg/L. TCC will <br />continue to monitor the site for any reoccurrence. The other exceedance was for the pH <br />maximum of 8.5, TCC had a high of 8.7 in late April. This may be attributed to algae buildup <br />during initial warm weather in the spring. A subsequent build up of surface duck weed reduced <br />much of the algae, and by June pH was more on the order of 8.0 <br />Very truly yours., <br />Brian A. Watterson, P.G. <br />Geologist, Environmental Group, <br />Twentymile Coal Company <br />Enclosures <br />cc: DBMS CWPS Permit No. CO-0042161 file