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'! _ PART 1 Pagc iz Permit No. CO-0000396 B. MONITORING REQUIItEMFN'fS 3. Acute WEi' Testine-Outfalls 004. 023. 024 and 026 (mntinuedl If ao pattern of bzicity is found the toxicity episode is considered b be coded and routine testing is to rrsume. If a pattern of toxicity is found, a PTUI'fE investigation is b be performed. If a pattern of tonicity is not demonstrated but a significant level of erratic tonicity is found, the Division may require an incrrased frequency of routine monitoring or some other modified approach. (d) PTl/CIE The results of the PT'I(CfE investigation are to'be received by the Division within 11.0 days o[ the demonstration of atvte WET in the routine test. as defined above, or if accelerated testing is txrfotmed. the date the pattern of toxidty a demonstrated. A stator report is to be arovided to the Division at the 30. 60 and 90 daypoints of the PTVI'IE investigation. The Division may extend the time frame for investigation where reasoaab(e justification exists. A request for an extension must be made is writing and received prior b the 120 day deadlino. Such request must include a justification and supporting data for such ea uteasioa. The permitter may ux the time for investigation b coaduU a PTT or move directly into the TIE. A PTT coasisls of a brief search for possible sours of WSI', which might reveal causes of such tonicity and appropriate corrective actions more simply and cost effectively than a formal TTE. If the PTI allows resolution of the WET incident, the TIE need not necessarily be coaducled. If, however, WET is not identified err resolved during the PTT, the TTE must be conducted within the allowed 120 day tune frame. Aay permitter that is required to conduct a PTI/I'lE investigation shall do so in conformance with procedures identified in the (ollov'iag documents, or as subsegtuatly updated: 1) Methods (or Aouatic Tozicity identification Evaluations. Phase 1 Tozicity Characterization Procodures. EPA/600/6-91/003 Feb. 91 and 2) Methods for Aouatic Tozicity identification Evaluations. Phase II Toxiciri identification Procedures. EPAlG00/3-88/035 Feb. 1989: A third document N this series is Methods for Aouatic Toxicity identification Evaluations. Phase Tii Tozicity Confirmation Procedures. EPA/G00/3-88!036 Feb. 1989. As indicated by the title, this procedure is intended to confirm that the suspected toxicant is truly the bzicaat. This investigation is optional. Within 90 days of the determination of the bzicant or ao later than 210 days after demonstration of bzicity, whichever is sooner, a control program is b be developed and received by the Division. The program shall set down a method and procedure (or elimination of the tonicity b acceptable levels. (e) R_gr, nest For Relief The permittee may request relief from further investigation and testing where the tozirznt has not been determined and the Division has determined suitable treatment does not appear possible. In requesting such relief, the permitter shall submit material sufTicient to establish the following: (i) It has complied with terrors and conditions of the permit compliance schedule for the PITlI1E investigation and other appropriate conditions as may Gave been required by the Division; fir) During the period of the tonicity incident it has ban in compliance with all other permit conditions, including, in the esse o(a POTW, pretreatment requirements; (iii) During the period of the bzicity 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 not be located or resolved. -_ ~ - ~ - -mod! +F r