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PART I Page ix Permit No. CO-0000396 B. MONITORING REQUIREMENTS 3. Acute WET Testin¢-Outfalls 004. 023. 024 and 026 (continued) If no pattern of toxicity is found the toxicity episode is considered to be ended end routine testing is to resume. If a pattern of toxicity is found, a PTI/ITE investigation is to be performed. If a pattern of toxicity is not demonstrated but a significant level of erratic toxicity is found, the Division may roquire m increased frequency of routine monitoring or some other modified approach. (d) PTT/ITE and 90 day points of the PTI/I'IE investittstion. The Division may extend the lima frame for investigation where reasonable justification exists. A request for an extettsioa must 6e made in writing and received prior to the 120 day deadline. Such roqueat must include • justifiaGoa and suppoRing data for such an extension. The pemtittee may use the time for investigation to conduct a PTI or move directly into the TIE. A PTT consists of a brief search for possible sources of WET, which might reveal causes of such toxicity and appropriate corrective actions more simply and cost effectively than a formal TIE. If the PTT 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 allowod 120 day time frame. Any perrnittee that is required to conduct a PTI/TTE investigation shall do so in conformance with procedures identified in the following documents, or as subsequently updated: 1) Methods for Aouatic Toxicity identification Evaluations. Phase I Toxicity Chencteriration Procedures. EPA/600/6-91/003 Feb. 91 and 2) Methods for Aouatic Toxicity identification Evaluations. Phase II Toxicity Identification Procedures. EPA/600/3-88/035 Feb. 1989. A third document in this series is Methods for Aouatic Toxicity idmtificetioe Evaluations. Phase III Toxicity Confirmation Procedures. EPA/600/3-88/036 Feb. 1989. As indicted by the title, this procedure is intended to confirm that the suspected toxirsnt is truly the toxicant. This investigation is optional. Within 90 days of the determination of the Wxirant or no later than 210 days after demonstration of toxicity, whichever is sooner, a control program is to be developed snd received by the Division. The program shall set down a method snd procedure for elimination of the toxicity to acceptable levels. (e) Request 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 petmittee shall subrnit materiel sufficient to establish the following: (i) It has complied with terms and conditions of the permit compliance schedule for the PTI/TIE investigation and other appropriate conditions es tray 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; (iii) During the period of the toxicity incident it has properly maintained and operated all facilities and systems of treatment and control; and (iv) Despite the circumstances described in paragraphs (i) and (iii) above, the source and/or cause of toxicity could not be located or resolved. mnnp wA~