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PARTI Permit No. CO-0029599 Page No. 5 A. DEFINITION OF EFFLUENT LIMITATIONS 2. Whole Effluent Toxicity Testing Requirements (Chronic) Outfall 001 (continued) The petmittee 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 more 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 T1E must be conducted within the allowed 120 day time frame. Any petmittee that is required to conduct a PTIITIE investigation shall do so in conformance with procedures identified in the following documents, or as subsequently updated: 1) Toxicity Identification Evaluation: Chazacterization of Chronically Toxic Effluents, Phase I, EPA/600/6-91/OOSF May 92, 2) Methods for Aquatic Toxici Identification Evaluations. Phase I Toxicity Chazacterization Procedures, EPA/600/6-91/003 Feb. 91 A fourth document in this series is Methods for Aquatic Toxicity Identification Evaluations, Phase III Toxicity Confirmation Procedures, EPA/600/3-88/036 Feb. 1989. As indicated by the title, this procedure is intended to confvm 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. 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 appeaz 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 for 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 outer permit conditions, including, in the case of a POTW, pre-treatment 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 tonicity could notbelocated or resolved. If deemed appropriate by the Division, the permit or the compliance schedule may be modified to revise the ongoing mortitoring and toxicity invesrigation requirements to avoid an unproductive expenditure of the permittee's resources, provided that the underlying obligation to eliminate any continuing enceedance of the toxicity limit shall remain. f. Spontaneous Disappearance If toxicity spontaneously disappears at any time aker a test failure, the petmittee shall notify the Division in writing within 14 days of a demonstration of disappearance of the toxicity. The Division may require the permittee to develop and submit additional information which may include, but is not limited to, the results of additional testing. If no pattern of [oxiciry is identified or recurring toxicity is not identified, the toxicity incident response is considered closed and normal WET testing shall resume. g. Toxicity Reopener This permit may be reopened and modified (following proper administrative procedures) to include new . compliance dates, additional or modified numerical permit limitations, a new or different compliance schedule, a change in the whole effluent toxicity testing protocol, or any other conditions rela[ed to the control of toxicants if one or more of the following events occur: See Part I.C. for DeFinilions.