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PART I <br />Page ix <br />Permit No. CO.0038024 <br />MONTCORING REQUIREMENTS <br />3. Acute WET Tes6n¢-OutfalLs 004. 023. 024 and 026 (continued) <br />If no pattern of toxicity is found the toxicity episode is considered to be ended and routine testing is to resume. If a <br />pattern of toxicity is found, a PTI/CIE investigation is to be performed. If a pattern of toxicity is not demonstrated <br />but a significant level of erratic toxicity is found, the Division may require an increased frequency of routine <br />monitoring or some other modified approach. <br />(d) '~/I'IE <br />and 90 day taints of the PTI/I'IE investigation. The Division taay extend the time frame for investigation whew <br />reavomble justification exists. A request far an extension must be made in writing and received prior to the 120 day <br />deadline. Such request must include • justification and supporting data for such as extension. <br />The permittee may use the time for investigation to conduct a PTI 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 moro simply and cost effectively than a formal TIE. If the PTI allows resolution of the WET incident, the <br />TIE noel not necessarily be conducted. If, however, WET is not identified or resolved during the PTI, the TIE <br />must be conducted within the allowed 120 day time frame. <br />Any permittee that is requtred to conduct a PTI/CIE investigation shall do so is conformance with procedures <br />• identified is the following documents, or as subsequently updated: 1) Methods for Aquatic Toxicity identification <br />Evaluations. Phase I Toxicity Characterisation Procedures. EPA/600/6-91/003 Feb. 91 and 2) Methods for Aquatic <br />Toxicity Identification Evaluations. Phase II Toxicity Identification Procedures. EPA/600/3-881035 Feb. 1989. <br />A Utird document is this series is Methods for Aquatic Toxicity Identification Evaluation. Phan 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) Request For Relief <br />The permittee may request rolief from further investigation sad testing where the toxicant has not bees determined <br />and the Division has determined suitable rM=eT~~r does not appear possible. In requesting such relief, the permittee <br />shall submit material sufficient W establish the following: <br />(i) It has complied with terms and conditions of the permit compliance schedule for the PTI/C[E investigation <br />and outer appropriate conditions as may have been required by the Division; <br />(ii) During the period of the toxicity incident it has been in compliance with all other permit conditions, <br />including, in the cau 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 sad control; and <br />• (iv) Despite the ciroumstaaces described is paragraphs (i) and (iii) above, the sotttce aadlor cause of toxicity <br />could not be located or resolved. <br />