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PARTI Page No. 5 Pemrit No.: CO-0047562 PTIPfIE investieation. The Division may extend the time frame for investigation where reasonable justficatiou 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 TIE. A PTI consists of a brief search for possible sources of WET, which might reveal causes of such toxicity and appropriate coaective 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 TIH must be conducted within the allowed 120 day time frame. Any permittee that is required to conduct a PTI/fIE investigation shall do so in conformance with procedures identified in the following documents, or as subsequently updated: 1) Toxicity Identification Evaluation Chamcterization of Chronically Toxic Effluents, Phase I. EPA/600/6-91/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 ToxicityIdentificationProcedures, EPA/600/3-88/035 Feb. 1989. A fourth document in this series is Methods for Aquatic Toxicity Identification Evaluafions. Phase IE Toxicity Confimtation Procedures. EPA/600/3-88/036 Feb. 1989. As indicated by the title, this procedure is intended to confine 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 elhnination of the toxicity to acceptable levels. e. Request For Relief The pemdttee may request relief from further investigation and testing where the toxicant has not been detemiiued and suitable treatment does not appear possible. In requesting such relief, the permittee shall submit material sufficient to establish the followigg: i. It has complied with temrs and conditions of the pemrit compliance schedule for the PTI/fIE investgatiou 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 condifioru, including, in the case of a POTW, pretreatment requirements; iii. During the period of the roxicity 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. If deemed appropriate by the Division, the permit or the compliaru:e schedule maybe modified to revise the ongoing monitoring and toxicity investigation requirements to avoid an unproductive expenditure of the pemtittee'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 after a test failure, the pernilttee shall notify the Division in writing within t4 days of a demonstratiou of disappearance of the toxicity. The Division may require the permittee to develop and submit additional infom>ation, which may include, but is not limited to, the results of additional testing. If no pattern of toxicity is idenfified or incurring toxicity is not identified, the toxicity incident response is considered closed and normal WET testing shall resume.