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Colowyo Coal Company <br />• 5731 State Highway 13 <br />O Meeker, CO 81641 <br />0 July 15, 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 />SECOND QUARTER 2011 DISCHARGE MONITORING REPORTS (DMR) <br />Dear Ms. Morgan, <br />Colowyo is submitting the Second 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 Second Quarter of 2011 at Outfall 001A for Total <br />Suspended Solids and Total Recoverable Iron; at Outfall 004A for Total Suspended Solids <br />and Total Recoverable Iron; at Outfall 007A for Total Recoverable Iron; and at Outfall 010A <br />for Total Suspended Solids and Total Recoverable Iron. BETX sampling was not required for <br />the quarter. Please feel free to contact me if you have any questions or concerns. I can be <br />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 />Colowyo Coal Company • 5731 State Highway 13 • Meeker, CO 81641 <br />T+ 1 970 824 1578 • F+ 1 970 824 1598 • http:// prospect .riotinto.org /irj /portal <br />