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Colowyo Coal Company <br />3731 State Highway 13 <br />Meeker, CO 81641 <br />October 17, 2011 <br />Ms. Kelly Morgan <br />Colorado Department of Public Health and Environment <br />Water Quality Control Division <br />4300 Cherry Creek Drive South <br />Denver, CO. 80246 -1530 <br />RE: COLOWYO COAL COMPANY L.P. (COLOWYO); CDPS NO. CO- 00045161 <br />THIRD QUARTER 2011 DISCHARGE MONITORING REPORTS (DMR) <br />Dear Ms. Morgan, <br />Colowyo is submitting the Third Quarter 2011 Discharge Monitoring Report to the Water <br />Quality Control Division. Please find the DMR reports attached for your review. Colowyo <br />exceeded Regulatory Limits during the Third Quarter of 2011 at Outfall 010A for Total <br />Suspended Solids. BETX sampling was not required for the quarter. Please feel free to <br />contact me if you have any questions or concerns. I can be reached at (970) 824 -1573. <br />Sincerely, <br />Chip Brown <br />Environmental Engineer <br />End. <br />CC: CDRMS /Janet H. Binns <br />NPDES Reports Binder w /encl <br />C.F. 21.1.2 w /encl <br />R9CEVE <br />OCT 2 201.1 <br />Uivision ;if Keciamation, <br />Mining and Safety <br />Colowyo Coal Company • 5731 State Hignway 13 • Meeker, CO 81641 <br />T+ 1 970 824 1578 • F+ 1 970 824 159.3 • http://prospect.riotinto.org/irj/portal <br />