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PART I <br />Page 15 <br />Pettttit No. COG-600000 <br />B. TERMS AND CONDITIONS <br />2. Effluent Limitations (eoatJ <br />1. WET Testing: The Division will aan,+n~ each discharge application on a ease by t:ase basis. <br />In cases where the data and circumstancrs justify, the Division may determine thaz WET <br />testing be required under the general permit for certain facilities. Similarly, the Division may <br />determine thaz the WET testing frequenry be tither increased or decreased from the normal <br />quazterly monitoring depending on the analytical data, durazioa of discharge, flow razes, or <br />other factors that the Division deem relevam. <br />As a condition of the permit, the pettnittee may be requited to conduct routine monitoring for <br />acute toxicity using two species, Ceriodanhnia sp. (water flea) and fathead minnows. Acute <br />toxicity occurs when a species mortality is any dilution of effluent (including 10096 effluenq <br />exceeds 50'R, for either species, or there is a statistically significant differetrce in the morality <br />observed for either species between the control and any effluent cottcentration. <br />The monitoring frequency for acute WET tests shall be quarterly, comm'nr~g with the fi[SI <br />full calendar quarter following the permit effective daze. Quarteriy test results shall be <br />reported oa a Quarterly DMR along with the Discharge Monitoring Reports (DMRs) <br />submitted for the end of the repotting calendar quarter (i.e., WET testing results for the <br />calendar quarter ending MatrJt 31 shall be reported with the DMR due April 28, with the <br />remaining WET rating reports submitted with DMRs due each July 28, October 28 and <br />January 28). <br />In addition to the WET tat repotting DMR, the permitter shall submit CDPS WET Tat <br />Report Forms (generally completed by the laborazory for each species). Copies of these <br />reports arc to be submitted to both the Division and the EPA. <br />The permitter shall conduct each acute WET tat is general at:cordance with methods <br />described in Methods for Measurine the Acute Toxicity of Efflurnts and Receivine Waters <br />to Freshwater and Marine Oreanisms, EPA/600/490/027 or the most current edition, except <br />as modified by the roost current Division guidaoa document entitled Colorado Wazer Quality <br />Control Division Biotnoaitorine Guidance Document (July 1993). The pettnitter shall conduct <br />an acute 48-hour WET test usirtg CeriodaDhnia sp., and an acute 96-hour WET test using <br />fathead minnows. Acute tests will be replacement static tats of a single effluent grab sample. <br />Should acute toxicity be detected, the permitter must provide written notification of the failure <br />of a WET' test to the Division, along with a statement as [o whether the Preliminary Toxicity <br />Incident ('PTI')(foxicity Identification Evaluation ('TIE') invaugation or accelerated testing <br />is being performed. NotiFication must be ratived by the Division within 14 calmdar days <br />o[ the demonstration o[ acute WET in the routine rtgnired test. 'Demonstration' means <br />no later than the Last day of the laboratory test. <br />if a routine acute WET test is failed, the permitter shall either: <br />(1) proceed to conduct the PTI/CIE invatigazian as described below or <br />(2) condttct accelerated testing using the single species found to be mote sensitive. <br />• <br />