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PARTI Page No. 8a Petmit No. CO-0000132 A. DEFINTI'[ON OF EFFLUENT LIhDTATIONS 5. Whole Effluent Toxiciri Testine Reguvements (Chronic) - Ou[fall 015 (continued) If no pattern of toxicity is found the toxicity episode is considered 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 )eve] of erratic toxicity is found, the Division may require an increased frequency of routine monitoring or some other modified approach. (d) P'IT/TIE The results of the PTFJ1'~ fnvestieation are to be received by the Division within 120 davs of the demonstration of chronic WET in the routine test, as defined above, or ff accelerated testine fs cerformed. the date the pattern of toxiciri is demonstrated. A status report is to be provided to the Division at the 30. 60 and 90 day points of the PTI/TfE investi¢ation. 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 pemtittee may use the time for investigation to conduct a PTI or move directly into the T1E. A PTI consists of a brief seazch 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 following documents, or as subsequently updated: 1) Tozicirv Identification Evaluation: Characterization of Chronically Toxic Effluents. Phase I, EPA/600/6-91/005F May 92, 2) Methods for Aquatic Toxicity Identification Evaluations. Phase I Toxicirv Chazacterization Procedures, EPA/600/6-91/003 Feb. 91 and 3) Methods for Aquatic Toxicirv Identification Evaluations. Phase II Toxicity Identification Procedures, EPA/600/3- 88/035 Feb. 1989. A fourth document in this series is Methods for Aouatic Toxicity Identification Evaluations. Phase III Toxicirv Confirmation Procedures, EPA/6(10/3-88/036 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 afrer demonsttation 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. (e) 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 appeaz possible. In requesting such relief, the permittee shall submit material sufficient m establish the following: i. It has complied with terms and conditions of the permit compliance schedule for the PTI/TIE investigation and other appropriate conditions as may have been required by the Division; See Part I.C. for Definitions. Amendment No. 5 Issued Effective PVB~NO,®tr, l., IN.