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PART I Page No. 6 Permit No. CO-0000132 A. DEFIlVTI'lON OF EFFLUENT LIlIIITATIONS 2. Acute WET Testine - Outfa11011 (continued) (d) P'I7/TIE The results of the PTT/TIE investigation are to be received by the Division within 120 days of the demonstration of acute WET in the routine test. as defined above. or if accelerated testine is ceriormed, the date the pattern of toxicity is demonstrated. A status report is to be provided to the Division at the 30. 60 and 90 day points of the PT7/TIE investigation. The 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 include a jtutification and supporting data for such an extension. The permittee may use the time for investigation to conduct a PTI or move d'uecdy imo the TIE. A PTI consists of a brief seazch 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 PTI allows resolurion 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 PTl/TIE investigation shall do so in conformance with procedures identified in the fallowing documents, or as subsequently updated: 1) Methods for Aquatic Toxicity Identification Evaluations. Phase I Toxicity Chazacterization Procedures, EPA/600/6-91!003 Feb. 91 and 2) Medtods for Aquatic Toxicity Identification Evaluations. Phase fI Toxicity Identification Procedures, EPA/600/3-88/035 Feb. 1989. A third document in this series is Methods for Aquatic Toxicity Identification Evaluations. Phase III Toxicirv Confirmation Procedures, EPA/fi00/3-88/036 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 latcr than 210 days after demonstration of toxicity, whichever is sooner, a convol 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) 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 vestment does not appear possible. ht reques[ing such relief, Ute permittee shall submit material 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 as may have been required by the Division; (ii) During dte period of the toxicity incident it has been in compliance with all other permit conditions, including, in the case of a POTW, preveatment requirements; (iii) During the period of the toxicity incident it has properly maintained and operated all facilities and systems of vestment and convol; and (iv) Despi[e the circumstances described in pazagraphs (i) and (iii) above, the source and/or cause of toxicity could not be located or resolved. If deemed appropriate by the Division, the permit or the compliance schedule may be modified to revise the ongoing monitoring and toxicity investigation requirements to avoid an unproductive expenditure of the permittee's resources, provided tha[ the underlying obligation to eliminate any continuing exceedence of [he toxicity limit shall remain. See Part I.C. for Det-utitions. Amendment No. 5 Issued Effective over rvn.mr. ~.. ~vw