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Peabodq <br />Twentymile Coal Company <br />29515 Routt County Road #27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />July 28, 2011 <br />111G 022011 <br />Division of Rt',tt <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 />RE: PERMIT CO- 0042161; SECOND QUARTER 2011 DMR SUBMITTAL <br />Dear Ms. Watson: <br />L-( Gt2 2_ (d <br />Please find enclosed the above referenced discharge monitoring reports for the period April 1, <br />2011 through June 30, 2011, for Outfalls 001A/001W/MON1 (all site 115), and 002A (sites 300E <br />and 3001). Outfall 001A/001W did not discharge during the period. <br />Influent site 3001 and discharge site (002A) discharged each week of the period. Exceedances <br />were noted for 002A for the 30 day average (75 mg /L) and daily maximum (110 mg /L) for total <br />suspended solids (TSS) in June at 195 mg /L (Note that only one sample was collected for that <br />month). April and May were 44 mg /L and 43 mg /L, respectively. Historically TSS has not been <br />an issue at this site. This may be the result of lower than normal flow on the day the sample was <br />collected. We will evaluate this anomaly in July. <br />There was also an exceedance for pH in May at 9.4. This was most likely the result of algae <br />buildup. Subsequent duck weed growth in June controlled the algae, and the pH dropped to 8.0. <br />If you have any questions, please contact me directly at (970) 870 -2750. <br />Best Regards, <br />Brian A. Watterson, P.G. <br />Geologist, Environmental Group, <br />Twentymile Coal Company <br />Enclosures <br />cc: DRMS CWPS Permit No. CO- 0042161 file <br />