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LTE. COMMERCIAL TESTING d ENGIN EE RING CO. <br />(~ DISCUSSION <br />According to the Western Fuels -Colorado discharge permit (CO-00002]3), an acute WET test <br />is 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 />By this definition, the results of this bioassay indicate that effluent from outfall 007 is not <br />acutely toxic to fathead minnows or Daphnia magna survival. Therefore, Western Fuels - <br />Colorado, New Horizon Mine discharge site 007, is in compliance with the acute WET portion <br />of its Colorado State Discharge Permit for the third quarter of 2002. <br />1 <br />:~ <br />4 <br />-5P6 <br />