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RAG Twentymile Coal Company 29515 Routt County Road # 27 Oak Creek, Colorado 80467 FtEDEtVED (s7o)s7s-3aoo MAY 0 12002 April 26, 2002 Division of Minerals and Geology Ms. Carla Lenkey Colorado Department of Public Health and Environment Water Quality Control Division -Permits and Enforcement 4300 Cherry Creek Drive South Denver, CO 80222-1530 RE: PERMIT CO.0042161: 1st QUARTER 2002 DMR SUBMITTAL Dear Ms. Lenkey: Please find enclosed the above referenced discharge monitoring reports for the period from January 1, 2002 through March 31, 2002. No permit limitation exceedences were reported during this period. Note that Outfall 001 discharged during the first two weeks of January, did not discharge in February, and began to discharge during the last 3 days in March. Outtall 002 flowed only during the last week in January, and every other subsequent week of the quarter. Please note that in a December 2001 telephone conversation between Chris Gates and myself, it was agreed that TCC would initiate single species acute WET testing for Outfall 001 beginning in 2002, in lieu of two species chronic testing. This was based upon based upon the same approval for single species acute testing under permit CO-0027154, and an eadier April 2001 request from TCC. A Quarterly Whole EfBuent Toxicity (WET) test was collected for acute testing at Outtall 001 on January 7, 2002. Test results indicated that the effluent was acutely toxic to Daphnia magna survival. Discharge stopped at Outfall 001 shortly thereafter, so that accelerated testing could not be initiated. When discharge began again at the end of March, another sample was collected on March 31, 2002 and submitted for standard acute WET testing. Test results indicated that the effluent was not toxic to the survival of Daphnia magna. A WET test sample was also collected in April (the beginning of the second quarter of 2002). This test also indicated that the effluent was not toxic to the survival of Daphnia magna. Thus, two consecutive tests have passed for Outtall 001. In our telephone conversation of April 15'", it was agreed that no further accelerated testing would be necessary. In the future, TCC will conduct accelerated testing as appropriate instead of standard WET testing. Note that a modified DMR sheet for reporting the single species WET test results has been used pending our receipt of new replacement DMRs. Please contact me directly at (970) 870-2750 for any questions. Twentymile Coal Company ~. ~r ~~~ Brian A. Watterson, Environmental Geologist enclosures cc: DMG CWPS Permit No. CO-0034142 file