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©~© <br />Twentymile Coal Company <br />29575 Routt County Road # 27 <br />~C~~I~ a~® Oak Creek, Colorado 80467 <br />G V (970) 8793800 <br />AUG 0 7 2003 <br />Oiuisian of Minerals and Geology <br />July 18, 2003 <br />Ms. Carla Lenkey <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: 2ND QUARTER 2003 DMR SUBMITTAL <br />Dear Ms. Lenkey: <br />~-Iq g2-U <br />Please find enclosed the above referenced discharge monitoring reports for the period from April 1, <br />2003 through June 30, 2003, for Outfalls 001A (site 115), 002A (300E), and 3001. Note that Outfall <br />001A discharged approximately one week in mid-April, and discharged the second half of May into the <br />first week of June before discharge stopped. Outfall 002A flowed during the period, buf stopped flowing <br />the second week in June. 3001 flowed each week of the period. No permit limitation exceedances <br />occurred during this period, with the exception of elevated pH readings at 002A during the first three <br />weeks of May (above the permit limit of 9.0). The elevated readings appear to be related to algae <br />growth in the waste water lagoons. Immediate use of an algaecide reduced algae growth. Subsequent <br />pH readings were all below 9.0. <br />A Quarterly Whole Effluent Toxicity (WET) was conducted for Outfall 001W in January 2003. This test <br />indicated that the effluent was not acutely toxic to Daphnia magna survival. Copies of the WET Test <br />Report Forms are attached. <br />Please contact me directly at (970) 870-2750 with any questions. <br /> <br />Brian A. Watterson, R.G. <br />Environmental Specialist <br />Enclosures <br />cc: DMG <br />CWPS Permit No. CO-0042161 file <br />