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• NARRATIVE <br />• CLIENT <br />Mountain Coal Company L.L.C., West Elk Mine, P.O. Box 591, 5174 Highway 133, <br />Somerset, CO 81434 <br />• DATE OF REPORT <br />October 11, 1999 <br />• PERMTT AND SAMPLE INFORMATION <br />NPDES permit #: CO-0038776 <br />Type of sample: Etl:luent Grab <br />Date and time of sample(s): 10!01/99 1045 <br />Date and time of test start: 10/04/99 1055 <br />Dilution water: Reconstituted Laboratory Water <br />• TEST ORGANISMS <br />Daphnia magna Age: <24 hrs <br />Fathead Minnow Age: 12 days <br />• • PROCEDIiRE <br />Acute, 48 and 96 hour bioassays as outlined in the most recent protocols specified by the <br />Water Quality Comrol Division of the Colorado Department of Health (1998). <br />• DISCUSSION <br />West Elk Mine effluent discharge site 013 was not acutely toxic to either fathead minnows <br />or Daphnia magna. Therefore, Mountain Coal Company is currently incompliance with the <br />acute WET portion of its Colorado State Discharge Permit for the fourth quarter of 1999. <br /> <br />COMMERCIAL TESTING ~ ENGINEERING CO. <br />F-~ LTA <br />Onginal Watermarked For Vour Protection ~ ~« a <br />