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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 LCsr,, which represents an estimate of the effluent concentration which is <br />.r lethal to 50% of the test organisms in the time period prescribed by the test, is found to be less <br />"f than or equal to 100% ellluent. <br />By this definition, the results of this bioassay indicate that elllueot from outfall 013 is not <br />acutely toxic to fathead minnows or Daphnia magna. Therefore, Mountain Coal Company is <br />.. in compliance with the acute WET portion of its Colorado State Discharge Permit for the second <br />quarter of 2000. <br /> <br /> <br />I~ <br />4 <br />3 <br />COM MERCIAL TE STING 8r ENGINEERING CO. <br />~F.~ L*~ <br />Original Watermarketl For Your Protection <br />