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DISCUSSION <br />~; <br />- According to the Mountain Coal Company discharge permit (CO-0038776), an acute WET test is <br />failed whenever the LCso, which represents an estimate of the effluent concentration which is <br />lethal to 50% of the test organisms in the time period prescribed by the test, is found to be less <br />than or equal to 100% effluent. <br />II ~ By this definition, the results of this bioassay indicate that effluent from outfall 013 is not acutely <br />toxic to fathead minnows or Daphnia magna. Therefore, Mountain Coal Company is in <br />compliance with the acute WET portion of its Colorado State Discharge Permit for the first <br />quarter of 2000. <br />'1 <br />;i <br /> <br />COMMERCIAL TESTING & ENGINEERING CO. <br />F~66 <br />~~ Ltd <br />Original WalennarkeE For Your Protection ~~ e <br />