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,, <br />000 <br />Twentymile Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />(970) 879-3800 <br />R~'CEiVED <br />April 28, 2003 <br />APR 3 p 2003 <br />Division of Minerals and Geology <br />Ms. Carla Lenkey <br />Colorado Department of Public Health and Environment <br />Water Quality Control Division -Permits and Enforcement <br />4300 Cherry Creek Ddve South <br />Denver, CO 80222-1530 <br />Phone:(303)692-3603 <br />RE: PERMIT CO-0036884: 1ST QUARTER 2003 DMR SUBMITTAL <br />Dear Ms. Lenkey: <br />L-1G ~2-D5~ <br />Please find enclosed the above referenced discharge monitoring reports for the period from January 1, 2003 through March <br />31, 2003. Outtall 001A (62 FCT) flowed each week of the period. No permit limitation exceedences accured during the <br />period. <br />Quarterly Whole EfFluent Toxicity (WET) tests were conducted for Outfall 001W in February 2003. This site passed for P. <br />Promelas, but was acutely toxic to C. Dubia. Two episodes of accelerated tes8ng subsequently failed, establishing a pattern <br />of toxicity. PTI tes8ng was initiated in late March 2003. Laboratory results of the PTI test indicated that the toxicity had <br />"spontaneously disappeared°. Periodic updates on the status of 001 W tasting was sent in writing to Mr. Chris Gates. Copies <br />of the WET Test Report forms are included with this submittal. <br />Please contact me directly at (970) 870-2750 for any further questions or additional information. <br />Tw,e~{ntymile-Coal Company <br />Brian A. Watterson, R.G. <br />Environmental Specialist <br />Enclosures <br />cc: DMG <br />CWPS Permit No. CO-0036684 file <br />