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PART 1 Page xiv Permit No. CO-0043648 If accelerated testing is being performed, the permitlee shall provide written notification of the results within 14 calendar days of completion of the "Pattern of Toxicity"/"No Toxicity" demonstration. 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 which caze a pattero of tonicity has been demonstrated or 2) two consecutive tests pass or three of five tests pass, in which case no pattero of toxicity has been found. !f no pattero of toxicity is found the toxicity episode is considered to be ended and routine testing is to resume. If a pattero of tonicity is found, a PTI/'I1E investigation is to be performed. If a pattero of toxicity is not demonstrated but a significant level of era[ic toxicity is found, the Division may require an increased frequency of routine monitoring or some other modified approach. (d) PTI/TIE The results of the PI'I!I'IE investigation are to be received by the Division within 120 days of the demonstration of chronic WET in the routine test, as defined above. or if accelerated testing is performed the date the pattern of [oxicily is demonstrated A status report is to be provided to the Division at the 30. 60 and 90 day points of the PTI/T1E 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 permiltee may use [he time for investigation [o 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 cos[ effectively than a formal TIE. Tf the PTI allows resolution of the WET incident, the T[E 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 pennittee that is required to conduct a PTIrI'IE investigation shall do so in conformance with procedures identified in the following documents, or az subsequently updated: I) Toxicity Identification Evaluation: Characterization of Chronically Toxic Effluents Phase 1, EPA/600/6-91/OOSF May 92, 2) Methods for Aquatic Toxicity ldentification Evaluations. Phase 1 Toxicity Characterization Procedures, EPA/600/6-91/003 Feb. 91 and 3) Methods for Aquatic Toxicity identification Evaluations. Phase 11 Toxicity 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 Division. The program shall set down a method and procedure for elirttination of the toxicity to acceptable levels. (f) Request For Relief The permtittee 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: (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; (ii) Dunng the period of the toxicity incident it haz been in compliance with all other perntit conditions, including, in the case of a POTW, pre-treatment requirements; IN D9P aNN~