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• • P~ I Page lh of 19 Permit No. CO-0000132 • B. MONITORING REQUIREMENTS 4. Acute WET Testing-Outfall 011 (continued) Tha Division may extend the time frame for investigation where reasonable justification exists. A request for an extension must be made in writing and received prior to the 120 day deadline. Such request must Snclude a justification and supporting data for such an extension. The permittee may use the time for investigation to conduct a PTI or move directly into the TIE. A PTI consists of a brief search for possible sources of WET, which might reveal causes of such toxicity and appropriate corrective actions fore simply and cost effectively than a formal TIE. If the PTI allows resolution of the WET incident, the TIE need not necessarily be conducted. If, however, WET is not identified or resolved during the PTI, the TIE must be conducted within the allowed 120 day time frame. Any permittee that is required to conduct a PTI/TIE investigation shall do so in conformance with procedures identified in the following documents, or as subsequently updated: 1) Methods for Acuatic Toxicity Identification Evaluations. Phase I Toxicity Characterization Procedures, EPA/600/6-91%003 Feb. 91 and 2) Methods for Acuatic Toxicity Identification Evaluations. Phase II Toxicitv Identification Procedures, EPA/600/3-88/035 Feb. 1989. • A third document in this series is Methods for Acuatic Toxicitv Identification Evaluations. Phase III Toxicity Confirmation Procedures, EPA/600/3-88/036 Feb.. 1989. As indicated by the title, this procedure is intended to confirm that the suspected toxicant is truly the toxicant. This investigation is optional. Within 90 days of the determination of the toxicant or no later than 210 days after demonstration of toxicity, whichever is sooner, a control program is to be developed and received by the Division. The program shall set down a method and procedure for elimination of the toxicity to acceptable levels. (e) Recuest For Relief The permittee may request relief from further investigation and testing where the toxicant has not been determined and the Division has determined suitable treatment does not appear possible. In requesting such relief, the permittee shall submit material sufficient to establish the following: (i) It has complied with terms and conditions of the permit compliance schedule fot the PTI/TIE investigation and other appropriate conditions as may have been required by the Division; (ii) During the period of the toxicity incident it has been in compliance with all other permit conditions, including, in the case of a POTW, pretreatment requirements; • Amendment 2 Issued a7 ~t ~ Effective 09 O/