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A. DEFINITION OF EFFLUENT LIMITATIONS <br />7. Whole Effluent Toxiciri Testing Requirements (Chronic) Outfalls 005.006, and 007 (continued) <br />(d) PTI/TIE <br />PARTI <br />Page 8a <br />PennitNo. CO-004 <br />investigation. The Division may extend the period for investigation where reasonable justification exists. A request for <br />an extension must be made in writing and received before the 120 day deadline. Such request must include a <br />justification and supporting data for such an extension. <br />The pemuttee may use the time for investigation to conduct a PTI or move directly into the TIE. A PTI consists of a <br />brief seazch for possible sources of WET, which might reveal causes of such toxicity and appropriate corrective actions <br />more simply and cost effectively than a formal TIE. If the PTI allows resolution of the WET incident, the TIE need not <br />necessarily be conducted. If, however, WET is not identified or resolved during the PTI, the TIE must be conducted <br />within the allowed 120 day time frame. <br />Any permittee that is required to conduct a PTT/ITE investigation shall do so in conformance with procedures identified <br />in the following documents, or as subsequently updated: 1) Toxiciri Identification Evaluation: Chazacterization of <br />Chronically Toxic Effluents, Phase I. EPA/600/6-91/OOSF May 92, 2) Methods for Aouatic Toxiciri Identification <br />Evaluations. Phase I Toxicity Characterization Procedures, EPA/600/6-91/003 Feb. 91 and 3) Methods for Aouatic <br />Toxicity Identification Evaluations, Phase II Toxiciri Identification Procedures. EPA/600/3-88/035 Feb. 1989. <br />A fourth document in this series is Methods for Aquatic Toxicity Identification Evaluations. Phase III ' <br />Confirmation Procedures. EPA/600/3-88/036 Feb. 1989. As indicated by the title, this procedure is intended to <br />that the suspected toxicant is truly the toxicant. This investigation is optional. <br />Within 90 days of the detemtination of the toxicant or no later than 210 days after demonstration of toxicity, whichever <br />is sooner, a control program is to be 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 pemuttee may request relief from further investigation and testing where the toxicant has not been determined and <br />the Division has determined suitable treatment does not appeaz possible. In requesting such relief, the permittee shall <br />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 and other <br />appropriate conditions as may have been required by the Division; <br />(ii) During the period of the toxicity incident it has complied with all other permit conditions, including, in the case of a <br />POTW, pre-treatment requirements; <br />(iii) During the period of the toxicity incident it has properly maintained and operated all facilities and systems of <br />treanment and control; and <br />(iv) Despite the circumstances described in pazagraphs (i) and (iii) above, the source and/or cause of toxicity could not <br />be located or resolved. <br />If deemed appropriate by the Division, the permit or the compliance schedule may be modified to revise the ongoing <br />monitoring and toxicity investigation requirements to avoid an unproductive expenditure of the pemuttee's resources, <br />provided that the underlying obligation to eliminate any continuing exceedence of the toxicity limit shall remain. <br />Amended: March 4, 2002 Effective: May 1, 2002 <br />