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Yart I Page No. 13 Permit No.: CO-0043648 If accelcrated testing is being performed, the permittee 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; I) two consecutive tests fail or three of five tests fail, to which case a pattem of toxicity has been demonstrated or 2) two consecutive tests pass or three of five tests pass, in which case no pattem of toxicity has been found. [f no pattem of toxicity is found the toxicity episode is considered to be ended and routine testing is to restune. If a pattem of toxicity is found, a PTI/fIE investigation is to be performed. If a pattem of toxicity is not demonstrated but a signiticant level of erratic toxicity ~s found, the Diyiston may require an increased frequency of routine monitoring or some other modified approach. (e) PTI/CiE The results of the PTLTIE investigation are to be received by the Division within 120 days of the demonstration of acute or chronic WET in the routine test, as defined above, or if accelerated tes[ine is performed, the date the pattern of toxicity is demonstrated. A status report is to be provided to the Division at the 30, 60 and 90 day ooints of the PTUfIE investigation. The Division may extend the time frame for investigation where reasonablejustification 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 Tom. A PTI consists of a brief search for possible sources of WET, which might reveal causes of such tonicity and appropnate 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 PTUI'IE investigation shall do so in conformance with procedures identified in the following documents, or as subsequently updated.l) 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 1 Toxiciri Characterization Procedures, EPA/600/6-91 /003 Feb. 91 and 3) Methods for Aquatic Toxicity Identification Evaluations Phase !I Toxicity identification Procedwes, EPA/600/3- 88/035 Feb. 1989. A fourth document in this series is Methods for Aquatic Toxiciri Identification Evaluations, Phase II[ Toxicity Confirmation Procedures, EPA/600/3-88/036 Feb. 1989. As indicated by the title, this procedure is intended to confum that the suspected toxicant is wly 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 far elimination of the toxicity to acceptable levels. (f) Reouest 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 [o establish the following: (i) I[ has complied with terms and conditions of the permit compliance schedule for the PTI/fIE investigation and other appropriate conditions as may have been required by the Division; (ii) During the period of the toxicity incident it has been incompliance with all other permit conditions, including, in the case of aPOT W,pre-treatment requirements, (iii) During the period of the toxicity incident it has properly maintained and operated 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 not be located or resolved.