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• PART I <br />Page 1L (i) of 19 <br />Permit No. CO-0000221 <br />E. MONITORING REQUIREMENTS <br />Acute WET Teating - Outfalls 002. 003. 005. 006. 010 and 011 <br />c) Automatic Compliance Schedule Upon Failure of Test (continued) <br />Testing will be at least once every two weeks for up to five tests until 1) <br />two consecutive tests fail or three of five tests fail, in which case a <br />pattern of toxicity has been demonstrated or, 2) two consecutive tests pass <br />or three of five tests pass, in which case no pattern of toxicity has been <br />found. If no pattern of toxicity is found, the toxicity episode is <br />considered to be ended and routine testing is to resume. If a pattern of <br />toxicity is found, a PTI/TIE investigation is to be performed. If a pattern <br />of toxicity is not demonstrated but a significant level of erratic toxicity <br />is found, the Division may require an increased frequency of routine <br />monitoring or some other modified approach. <br />d) PTI TIE <br />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 <br />of WET, which might reveal causes of such toxicity and appropriate corrective <br />actions more simply and coat effectively than a formal TIE. If the PTI <br />allows resolution of the WET incident, the TIE need not necessarily be <br />conducted. If, however, WET is not identified oz resolved during the PTI, <br />the TIE must be conducted within the allowed 120 day time frame. <br />Any permittee that is required to conduct a PTI/TIE investigation shall do so <br />in conformance with procedures identified in the following documents, or as <br />subsequently updated: 1) Methods for Aquatic Toxicitv Identification <br />-88/035 Feb. 1989. <br />A third document in this series is <br />EPA/600/3-88/036 Feb. 1989. As indicated by the title, this procedure is <br />intended to confirm that the suspected toxicant is truly the toxicant. This <br />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 <br />be developed and received by the Division. The program shall set down a <br />method and procedure for elimination of the toxicity to acceptable levels. <br />• Amended 07 OB 94 Effective 09 O1 94 <br />Amended Effective _~. <br />