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PART I Page 12 Permit No. CO-0000221 A. TERMS AND CONDITIONS 5. If accelerated testirtg is being pets 14 calendar days of completion of least once every two weeks for up t case a pattern of toxicity has been t case no pattern of toxicity has been ended and routine testing is to resat If a pattern of toxicity is not demon require an increased frequency of n d. PTIlI7E IJ med, the permittee shall provide tvrittea notiRcation of the results within to "Pattern of Toxicity"/"No Toxicity" demottstratioo. Testing will be at five tesu until; 1) two consecutive tests fail or three of five tests fail, in which monsvated or 2) two consecutive tuts pazs or three of five tests pass, in which rand. If no pattern of toxicity is found the toxicity episode is considered to be :. If a panem of toxicity is found, aPTI/TIE investigation is to be performed. rated but a significant level of erratic toxicity is found, the Division may tine monitoring or some other modified approach. and 90 day points of the PTI/TIE investigation. The Division may extend the time frame for investigation where reasonable justification exists. Are uest for an extension must be made in writing and received prior to the : 20 day deadline. Such request must include a justifitation and supposing data for such an extension. The permittee may use the time (or investigation to condut:t a PTI or move directly into the TIE. A PTI con!ists of a brief search for possible sources o WET, which might reveal causes of such toxicity and appropriate corrective actions more simply and cos[ effecti ely than a formal TIE:. If the PTI allows resolution of the WET incident, the TIE need not necessarily be conduct 1f, however, WE"f 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 aPTI/TIE investigation shall do so in conformance with procedures identified in the following documen , or az subsequently updated: 1) Toxiciri Tdentification Evaluation: Characteriration of Chronically Tox~c Effluents. Phaze I, EPA/600/6-91/OOSF May 92, 2) Methods for Aquatic Toxicity Identification Evaluations. 1'haze 1 Toxicity Charttcteri7atio^ Procedures EPA/600!6-91/003 Feb. 91 and 3) Methods for Aouatic Toxiciri Identification Evaluations. Phase it Toxicity identification Procedures EPA/60)/3- 88/035 Feb. 1989. ~ A fourth document in this series is Confirmation Procedures. EPA/60( confirm that the suspected toxicant Within 90 days of the determination whichever is sooner, a control prog, down a method and procedure for e e. Reoues[ For Relief The permittee tray request relief and the Division has determined shall submit material sufficient to It haz complied with terms and other appropriate cond ii. During the period of the including, in the case of a 88/036 Feb. 1989. As indicated by the title, this procedure is intended to truly the toxicant. 11tis investigation is optional. the toxicant or no later than 210 days after demonstration of toxicity, is to be developed and received b}' the Division. The program shall :'.et of the tozici.ty to acceptable levels. further investigation and testing where the toxicant has not been determned le treatment does not appear possible. in requesting such relief, the ptrmi[[ee lish the following: conditions of dte permit compliance schedule for the PTI/TIE investigation s az may have been required by the Division; incident it has been in compliance with all other permit conditions, S ', pre-treatment requirements; INDeP d/9/93