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PART I Page lh of 19 Permit No. CO-0027146 B. MONITORING REQUIREMENTS 4. Acute WET Testine - Outfalls 001 002. 004 and 015 (continued) 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 Aquatic Toxicity Identification Evaluations. Phase I Toxicity Characterization Procedures, EPA/600/6-91/003 Feb. 91 and 2) Methods for Aquatic Toxicity Identification Evaluations. Phase II Toxicity Identification Procedures, EPA/600/3-88/035 Feb. 1989. A third document in this series is Methods far 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 confirm that the suspected toxicant is truly the toxicant. This investigation is optional. Within 90 days of the determination of the toxicant ar 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 pezmittee 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 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 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/oz 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 that the underlying obligation to eliminate any continuing exceedance of the toxicity limit shall remain. Amendment No. 1 Issued 6 qF r+ Effective 0 0/