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PARTI Page No. 6 Permit No. CO-0036595 A. DEFINITION OF EFFLUENT LIMITATIONS 2. Acute WET Testine - Outfall 004 fcontinuedl (c) Automatic Compliance Schedule Upon Failure of Test If a routine acute WET test is failed, the following automatic compliance schedule shall apply. As part of this the permittee shall either: (i) proceed to conduct the PTl/TIE investigation az described in Part I.A.2.(d), or (ii) conduct accelerated testing using the single species found to be more sensitive. IC accelerated testing is being perfot~tted, the permittee shall provide written notification of the results withi 14 calendar days of completion of the "Pattern of Toxicity"/"No Toxicity" demonstretion. Testing will be at least once every two weeks for up to five tests until 1) two consecutive tests fail or three of five tests fail, in whit[ case a pattern of toxicity has been demonstrated or, 2) two consecutive tuts pazs or three of five tests pass, in which caze no pattern of toxicity has been found. If no pattern of toxicity is found the toxicity episode is considers to be ended and routine testing is to resume. If a pattern of toxicity is found, aPTI/TIE investigation is to be performed. If a pattern of toxicity is not demonstrated but a significant level of erratic toxicity is found, the Division tray require an increased frequenry of routine monitoring or some other modified approach. (d) PTIITIE The results of the PTI/TIE investieation ere to be received by the Division within 120 days of the demonstration of acute WET in the routine test. as defined above. or if accelerated testine is performed, the •_J date the~attern of toxicity is demonstrated. A status report is to be provided to the Division et the 30. 60 J and 90 day points of the PI'I/'I'IE investieation. The Division may extend the time frame for investigation when reasonable justification exists. A request for an extension must be made in writing and received prior to the 120 da deadline. Such request must include a justification and supporting data for such an extension. The permittee may use the time for investigation to conduct a PTI or move directly into the TIE. A PTl consists ofl a brief search for possible sources of WET, which might reveal causes of such toxicity and appropriate corrective actions more simply and cost effectively than a formal TIE. If the PTI allows resolution of the WET incident, the TIE need not necessarily be conducted. If, however, WET is not identified or resolved during the PTI, the TIE must be conducted within the allowed 120 day time frame. Any permittee that is required to conduct aPTI/TIE investigation shall do so in conformance with procedures identified in the fallowing documents, or az subsequently updated: 1) Methods for Aquatic Toxicity Identification Evaluations. Phase 1 Toxicity Characterization Procedures, EPA/600/6-91/003 Feb. 91 and 2) Methods for Aquatic Toxicity Identification Evaluations. Phase II Toxicity Identification Procedures, EPA/600/3-88/035 Feb. 1989. A third document in this series is Methods for Aquatic Toxicity identification Evaluations. Phaze III Toxicity Confirmation Procedures, EPA/600/3-88/036 Feb. 1989. As indicated by the title, this procedure is intended to confirm that the suspected toxicant is truly the toxicant. This investigation is optional. Within 90 days of the determination of the toxicant or no later than 210 days after demonstration of toxicity, whichever is sooner, a control program is to be developed and received by the Division. The program shall se[ down a method and procedure for elimination of the toxicity to acceptable levels. ~xoe n...w ,., iwx