Laserfiche WebLink
Narrative and Discussion <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 />Receiving temperature(s): <br />CO-0000213 <br />Effluent Grab <br />03/12/08 0937 <br />03/13/081130 <br />Reconstituted Laboratory Water <br />4.3 °C <br />• TEST ORGANISMS <br />Fathead minnow <br />Ceriodaphnia dubia <br />Age: <14 days <br />Age: <24 hrs <br />• PROCEDURE <br />Acute, 48 and 96-hour bioassays as outlined in the mast recent protocols specked by the Water <br />Quality Controi Division of the Coiorado Department of Health {1998). <br />• DISGUSSION <br />According to the Western Fuels -Colorado discharge permit (CO-0000213), an acute WET test is <br />failed whenever the LCD, 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 008 is not <br />acutely toxic to fathead minnow or Ceriodaphnia dubia survival. Therefore, outfall 008 is <br />in compliance with the acute WET portion of its Colorado State Industrial General Minimal <br />Discharge Permit for the first quarter of 2008. <br />• DATE OF REPORT <br />Apri{ 14, 2008 <br />Report epared by: Stepha a Green <br />rl <br />Supervisor Bi` as aboratory <br />4 <br />