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DISCUSSION <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% efl]uent. <br />By this definition, the results of this bioassay indicate that effluent from outfall 017 is not <br />~: . <br />acutely toxic to fathead minnows or Daphnia magna survival. Therefore, Mountain Coal <br />Company is in compliance with the acute WET portion of its Colorado State Dsscharge Permit <br />for the fourth quarter of 2000. <br />a <br />COMMERCIAL TESTING & ENGINEERING CO. <br />Fi66 Lt~ <br />,Original Watermarked For Your Protection ce .o. <br />