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PA[a' I Page li of 19 Permit No. C17-0032115 8. M)NC0.7RING RE7QUIItF2~S715 4. Acute HEI' Testin¢-Outfells 001. 002. 005, 009. 011. 013 015 end 016 (contirn~ed) (d) PTI/I'IE The permittee may use the time for Snvestigption to conduct a PIT 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 erd appropriate corrective actions more singly and cost effectively than a formal TIE. If the PI'I allows resolution of the WET incident, the TIE need not necessarily be corducted. If, however, WEf is rot identified or resolved during the PTI, the TIE must be conducted within the allowed 120 day time frame. Any permittee that is required to cord<rct a PCI/fIE investigation shall do so in conformar~ce with procedures identified in the following doeunents, or as subsequently updated: 1) Methods for Aquatic Toxicity Identification Evaluations. Phase I Toxicity Characterization Procedures, EPF~/600/6-91/003 Feb. 91 and 2) Methods for Arniatic Toxicity Identification Evaluations. Phase 11 Toxicity identification Procedures, EPA/600/3-88/035 Feb. 1989. A third document in this series is Methods for Aquatic Toxicity Identification Evaluations. Phase III Toxicity Confinn3tion Procedures, EPA/600/3-88/036 Feb. 1989. As indicated by the title, this procedure is intended to confina that the suspected toxicant is truly the toxicant. This investigation is optional. Within 90 days of the determination of the toxicant or m later than 210 days after demonstration of toxicity, whichever is sourer, a cont~'ol program is to be developed and received by Uie Division. The program shall set down a method and procedure for elimination of the toxicity to accept-ible 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 appear possible. In requesting such relief, the pennittee shall sutxnit material sufficient to establish the following: (i) It }ias con~lied with terms and conditions of the pettnit coe~liance schedule for the P11/I'IE Lrtves[igation and other approprla[e conditions as may have been re~~lred by the Division; (ii) During the period of the toxicity incident it has been Ln co~liarx e with all other permit conditions, including, in the case of a FO1L1, pretreatment requirements; Arrerdrren[ 2 Issued 03/15/94 Effective OS O1 94 Amercfient 3 Issued a7~o¢/4y Effective ~/ r+'/ Division may extend the time frame for imrestlgation 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 et.Wporting data for such an extension.