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L~ COMMERCIALTESTING & ENGINEERING CO. <br />l~TA~~2A~~~~ <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 />July 22, 2002 <br />PERMIT AND SAMPLE INFORMATION <br />NPDES permit #: <br />Type of sample: <br />Date and time of sample(s): <br />Date and time of test start: <br />Dilution water: <br />CO-0038776 <br />Eflluent Grab <br />07/16/02 0830 <br />07/17/02 1145 <br />Reconstituted Laboratory Water <br />• TEST ORGANISMS <br />Daphnia magna <br />Fathead Minnow <br />Age: <24 hrs <br />Age: 13 days <br />• PROCEDURE <br />Acute, 48 and 96 hour bioassays as outlined in the most recent protocols specified by the <br />Water Quality Control Division ofthe Colorado Department of Health (1998). <br />• DISCUSSION <br />West Fork of Sylvester Gulch effluent dischazge site 017 was not acutely toxic to either <br />fathead minnows or Daphnia magna survival. Therefore, Mountain Coal Company is <br />currently in compliance with the acute WET portion of its Colorado State Dischazge Permit <br />for the third quarter of 2002. <br />-s2E <br />