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B • Part Page lg of 19 Permit No. CO-0042562 MONITORING REQUIREMENTS 4. Chronic WET TestinP - Outfalls 001 and 002 (continued) (e) PTI TIE cont'd 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) Toxicitv Identification Evaluation: Characterization of Chronically Toxic Effluents. Phase I, EPA/600/6-91/OOSF May 92, 2) Methods for Aquatic Toxicity Identification Evaluations. Phase I Toxicity Characterization Procedures, EPA/600/6- 91/003 Feb. 91 and 3) Methods for Aquatic Toxicity Identification Evaluations. Phase II Toxicity Identification Procedures, EPA/600/3- 88/035 Feb. 1989. A fourth document in this series is Methods for Aquatic Toxicitv 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 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. (f) 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 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, 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 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. amended effective