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PARTI Page No. 5 Pernut No.: CO-0047562 PTUTIE investi ag tion. 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 justificatian and supporting data for such an extension. The permittee may use the time for investigation to conduct a PTT 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 TIS 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 pe-Tnittee 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/600/6-9I/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 Aquatic_ Toxicity Identification Evaluations Phase II Toxicity Ident~cation 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/6 0 0/3-8 8103 6 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 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 suitable treatment does not appear possible. in requesting such relief, the permittee shall submit material sufficient to establish the following: It has complied with terms and conditions of the permit compliance schedule for the PTI/TlE investigation and other appropriate conditions as may have been required by the WQCD; ii. During the period of the toxicity incident it has been incompliance with all other permit conditions, including, in the case of a POTW, pretreatment 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 solute and/or cause of toxicity could not be located or resolved. If deemed appropriate by the Division, the permit or the compliance schedule maybe modified to revise the ongoing monitoring and toxicity roves#igation requirements to avoid an unproductive expenditure of the pennittee's resources, provided that the underlying obligation to eliminate any continuing exceedance of the toxicity limit shall remain. f. Spontaneous Disappearance If toxicity spontaneously disappears at any time aRer a test failure, the permittee shall notify the Division in writing within 14 days of a demonstration of disappearance of the toxicity. The Division may require the penmittee to develop and submit additional information, which may include, but is not limited to, the results of additional testing. If no pattern of toxicity is identified or recurring toxicity is not identified, the toxicity incident response is considered closed and normal WET testing shall resume.