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i Part Page li of 19 ' Permit No.: CO-0(132751 (e) PTI TIE The results of the PTI/TIE investigation are to be received by the Division within 120 days of the demonstration of chronic Wf;T in the routine test._as defined above. or if accelerated testing is. performed. the date the pattern of toxicity is demonstrated._A status revort is to be urovided to the Division at the 30. EO and 90 day voints of the PTI/TIE investigation. The Division may extend the time frame for investigation where reasonable justification exists. A request for an extension must be made in writing and received prior to the 120 day 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 PTI consists of 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 a PTI/TIE investigation shall do so in conformance with procedures identified in the following documents, or as subsequently updated: 1) Toxicity Identification Evaluation: Characterization of Chronically Toxic Effluents. Phase I, EPA/600/6-91/OOSF May 92, 2) Methods for Aquatic Toxicity Identification Evaluations. Phase I Toxicity Characterization Procedures, EPA/600/6-91/003 Feb. 91 and 3) Methods for Aeuatic Toxicity Identification Evaluations. Phase II Tox ci Identification Procedures, EPA/600/3-88/035 Feb. 1989. A fourth document in this series is Methods for Aquatic Toxicity Identification Evaluations. Phase 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 DivisLon. The program shall set down a method and procedure for elimination of the toxicity to acceptable levels. (f) Request For Relief The permittee may request relief from further investigation .and testing where the toxicant has not been determined and the Division has determined suitable treatment does not appear possible. In requesting such relief, the permittee shall submit material sufficient to establish the following: Amended Effective