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Pr•.RnilT. Pnlrr I Pace le ut 13 I'cnnil N~~. CU-W~2biS (e) P"fl/TIE The results of the PI'1/TIE investigation are to be received by the Division within 120 davs of the demonstration of chronic WET in the routine lest, as defined above, or if accelerated testing is performed, the dale the pattern of toxicity is demonstrated. A status report is to be provided to the Division at the 30. 60 and 90 day points of the PTI/7'IE 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 suppoAing data for such an extension. The permittce may use the time for investigation to conduct a PT[ or move directly into the TIE. A PTI consists of a brief search for possible sources of WET, which might reveal causes of such tonicity and appropriate corrective actiotu more simply and cost effectively than a formal TIE. If the PTI allows resolution of the WET incident, the TIE Head 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 PTUTIE investigation shall do so in conformance with procedures identified in the following documents, or as subsequently updated: 1) Tonicity Identification Evaluation: Characterization of Chronically Toxic Effluents. Phase I, EPA/600/fr91/OOSF May 92, 2) Methods for Aquatic Toxici~ Identification Evaluations. Phase I Toxicity Characterization Procedures, EPA/600/6-91/003 Feb. 91 and 3) Methods for Aquatic Toxicit~dentification Evaluations. Phase 11 Tonicity Identification Procedures, EPA/600/3-88/035 Feb. 1989. A fourth dorument is this series is Methods far 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 cgofirm that the suspected toxicant is truly the toxicant. This investigation is optional, Within 90 days of the determination of the toxicant or no taro tltan 210 days after demonstration of toxicity, whichever is sooner, a control program is to be developed and received by the Division. The program shall set down a method and procedure for elimination of the toxicity to acceptable levels. (f) Request For Relief The permittee troy request relief from further investigation and testing where the toxicant bas not been determined and We Division has determined suitable Irratmmt does not appear possible. In requesting such relief, the permittee shall submit material sufficient to establish the following: (i) It has eompliod with terms and conditions of the permit compliance schedule for We PT[fI'lE investigation and other appropriate conditions as may Gave been required by the WQCD; (ii) During the period of We tonicity incident it has boen w compliance with all other permit conditions, including, in the case of a POTW, predrea[ment requirements; (iii) Doting the period of the tonicity incident it has properly maintained and opereted all facilities and systems of treatment and control; and (iv) Despite the circumstances described in paragraphs (i) and (iii) above, the source and/or cause of toxicity could pot be located or resolved. .lf deemed appropriate by the Division, the permit or the compliance schedule may be modified to revise the ongoing monitoring and tonicity investigation requirements to avoid an unproductive expenditure of the pertniltee's resources, provided t}tat the underlying obligation to eliminate any continuing exceedance of the toxicity limit shall remain.