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• ~ I <br />Page lh of 19 <br />Permit No. CO-0000132 <br />• <br />B. MONITORING REQUIREMENTS <br />4. Acute WET Testing-Outfall 011 (continued) <br />The Division may extend the time frame for investigation where reasonable <br />justification exists. A request for an extension must be made in writing and <br />received prior to the 120 day deadline. Such request must include a <br />justification and supporting data for such an extension. <br />The permittee may use the time for investigation to conduct a PTI or move <br />directly into the TIE. A PTI consists of a brief search for possible sources of <br />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 <br />resolution of the WET incident, the TIE need not necessarily be conducted. If, <br />however, WET is not identified or resolved during the PTI, the TIE must be <br />conducted within the allowed 120 day time frame. <br />Any permittee that is required to conduct a PTI/TIE investigation shall do so in <br />conformance with procedures identified in the following documents, ar as <br />subsequently updated: 1) Methods for Acuatic Toxicitv Identification <br />Evaluations. Phase I Toxicity Characterization Procedures, EPA/600/6-91/003 Feb. <br />91 and 2) Methods for Acuatic Toxicitv Identification Evaluations. Phase II <br />Toxicitv Identification Procedures, EPA/600/3-88/035 Feb. 1989. <br />• A third document in this series is Methods for Aquatic Toxicitv Identification <br />Evaluations, Phase III Toxicity Confirmation Procedures, EPA/600/3-88/036 Feb. , <br />1989. As indicated by the title, this procedure is intended to confirm that the <br />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 <br />after demonstration of toxicity, whichever is sooner, a control program is to be <br />developed and received by the Division. The program shall set down a method and <br />procedure for elimination of the toxicity to acceptable levels. <br />(e) Request For Relief <br />The permittee may request relief from further investigation and testing where <br />the toxicant has not been determined and the Division has determined suitable <br />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 <br />schedule for the PTI/TIE investigation and other appropriate conditions as <br />may have been required by the Division; <br />(ii) During the period of the toxicity incident it has been in compliance with <br />all other permit conditions, including, in the case of a POTW, <br />pretreatment requirements; <br />• <br />Amendment 2 Issued e7 of ! Effective e9 0/ <br />