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PART I <br />Page x <br />Permit No. CO-0032638 <br />B. MONI7'ORIIVG REQIJQiEMENTS <br />3. Acute WET Testing - Outfalls 004 and 007 (continued) <br />d. PTI/TIE <br />The results of the PTI/TIE investigation are to be received by the Division within 120 days of the <br />demonstration of acute WET in the routine test, as defined above, or if accelerated testing is performed, the <br />date the pattern of toxicity is demonstrated. A status report is to be provided to the Division a[ the 30, 60 <br />and 90 day points of the PTlITTE investigation. The Division may extend the time frame for investigation where <br />reasonable justification exists. A request for an extension must be made in writing and received prior to the 120 day <br />deadline. Such request must include a justification and supposing data for such an extension. <br />The pennittee may use the time for investigation to conduct a PTl or move directly into the TIE. A PTI consists of <br />a brief search for possible sources of WET, which might reveal causes of such toxicity and appropriate corrective <br />actions more simply and cost effectively than a formal TIE. If the PTI allows resolution of the WET incident, the <br />TIE need not necessazily be conducted. If, however, WET is not identified or resolved during the PTI, the T[E <br />must be conducted within the allowed 120 day time frame. <br />Any permittee that is required to conduct a PTl/TIE investigation shall do so in conformance with procedures <br />identified in the following documents, or as subsequently updated: I) Methods for Aquatic Toxicity Identification <br />Evaluations. Phase 1 Toxicity Characterization Procedures, EPA/600/6-91/003 Feb. 9l and 2) Methods for Aouatic <br />Toxicity Identification Evaluations, Phase ll Toxicity Identification Procedures, EPA/600/3-88/035 Feb. 1989. <br />A third document in this series is Methods for Aquatic Toxicity Identification Evaluations. Phase III Toxicity <br />Confirmation Procedures, EPA/600/3-88/036 Feb. 1989. As indicated by the title, this procedure is intended to <br />confirm that the suspected toxicant is truly the toxicant. This investigation is optional. <br />Within 90 days of the determination of the toxicant or no later than 210 days after demonstration of toxicity, <br />whichever is sooner, a control program is to be developed and received by the Division. The program shall set <br />down a method and procedure for elimination of the toxicity to acceptable levels. <br />e. Reouest For Relief <br />The permittee may request relief from (usher investigation and testing where the toxicant has not been determined <br />and the Division has determined suitable treatment does not appear possible. In requesting such relief, the permittee <br />shall submit material sufficient to establish the following: <br />(i) It has complied with terms and conditions of the permit compliance schedule for the PTI/TIE investigation <br />and other appropriate conditions as may have been required by the Division; <br />(ii) During the period of the toxicity incident i[ has been in compliance with all other permit conditions, <br />including, in the case of a POTW, pretreatment requirements; <br />(iii) During the period of the toxicity incident it has properly maintained and operated all facilities and systems <br />of treatment and control; and <br />(iv) Despite the circumstances described in paragraphs (i) and (iii) above, the source and/or cause of toxicity <br />could not be located or resolved. <br />See Part I.C. for Definitions. Amendment No. 1 Issued Effective <br />