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C-19~--c~s(~ <br />RAG <br />RECEIVED <br />au~ o ~ 2003 <br />Twentymiie Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />(970) 879-3800 <br />Division 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 />Phone: (303)692-3603 <br />RE: PERMIT CO-0036684: 2ND QUARTER 2003 DMR SUBMITTAL <br />Dear Ms. Lenkey: <br />Please find enclosed the above referenced discharge monitoring reports for the period from April 1, 2003 through June 30, <br />2003. Outfall 001A (62 FCT) flowed each week of the period. No permit limitation exceedences occurred during the period, <br />with the exception of Wet testng, discussed below. <br />A Quarterly Whole Effluent Toxicity (WET) test was conducted for Outfall 001W in May 2003. This site passed for P. <br />Promelas, but was acutely toxic to C. Dubia. Two subsequent episodes of accelerated testing in June indicated continued <br />toxicity. PTI testing was initiated in late June 2003. Periodic updates on the status of 001 W testing was sent in writing to Mr. <br />Chris Gates. Laboratory results of the PTI test strongly indicated that acute toxicity is the result of total dissolved solids <br />caused by calcium sulfate. Copies of the WET Test Report Forms are included with this submittal. In early July, 2003, <br />Twentymile Coal activated an aerator unit at the pond above this outfall in an effort to enhance future W ET test results. <br />Please contact me directly at (970) 870-2750 far any further questions or additional information. <br />Twentymile Ccal Company <br />~5 . ~'. lY~/a~i-...-~ <br />Brian A. Watterson, R.G. <br />Environmental Specialist <br />Enclosures <br />cc: DMG <br />CWPS Permit No. CO-0036684 file <br />