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YAIZ'r I <br />Page to <br />Perm« Nu. CO-0000221 <br />• A. 'I'I?R~9S AYD COfYDITIONS <br />4. 1Vhulc Effluent Toxicity Testing Renuirements (Acute) - Outfnlls 11112 003 605 006 0h11 01 I Ul2 013 Ola Olfi <br />and 017 (continued) <br />The permi«ee may use the time for investigation to conduct a PTI or move directly into the TIE A PTI consists of a <br />brief search For possible sources of WET, which might reveal causes of such toxicity and appropriate corrective <br />actions more simply and cost effectively than a formal TIE. IF the PTI allows resolu[ion of the WET inctdent, the <br />TIE need not necessarily be conducted. IF. however, WET is not identified or resolved during the PTI. the TIE must <br />be conducted within the allowed I20 day time frame. <br />Any permittee that is required to conduct a PTl/TIE investigation shall do so in conformance with procedures <br />identified in the following documents, or as subsequently updated I) lvlethnds for ,4quatic Toxicirv Identification <br />Evaluations. Phase I Toxicirv Characterization Procedures, EPA/600/6-91/003 Feb. 91 and 2) Methods (nr Aquatic <br />Toxicirv Identification Evaluations. Phase II Toxicity Identification Procedures, EP,4/600/3-88!035 Feb. 1989 <br />A third document in this series is Methods for Aouatic Toxicirv Identification Evaluations Phase I[I Toxicity <br />Confirmation Procedures, EPA/600/3-88/036 Feb. 1989. As indicated by the title, this procedure is intended to <br />confirm that the suspected toxicant is truly the toxicant. This investigation is optional. <br />Within 90 days of the determination of the toxicant or no later than 2l0 days after demonstration oftoxicity, <br />whichever is sooner, a control program is to be developed and received by the Division. The program shall set down <br />a method and procedure for elimina[ion of the toziciry to acceptable levels. <br />e. Request For Relief <br />• The permittee may request relief from further investigation and testing where the toxicant has not been determined <br />and the Division has determined suitable treatment does not appear possible. In requesting such relief, the permittee <br />shall submit material sufficient to establish the following: <br />f. It has complied with terms and conditions of the permit compliance schedule for the PTI/TlE investigation and <br />other appropriate conditions as may have been required by the Division; <br />ii. During the period of the toziciry incident it has been in compliance with all other permit conditions, including, in <br />the case of a POTW, pretreatment requirements; <br />iii. During the period o(the toxicity inctdent it has properly maintained and operated all facilities and systems of <br />treatment and control; and <br />iv. Despite the circumstances described in paragraphs (1) and (iii) above, the source and/or cause o(toxiciry could not <br />be located or resolved. <br />If deemed appropriate by the Division, [he permit or the compliance schedule may be modified to revise the ongoing <br />monitoring and toxicity ~mvestigation requirements to avoid an unproductive expenditure of the pertttittee's resources, <br />provided that the underlying obligation to eliminate any continuing exceedance of the toziciry lima shall remain. <br />Sonntaneous Disaooearance <br />If toxicity spontaneously disappears at any time after a test (allure, the permittee shall notify the Division m writing <br />wnhm 14 days of a demonstration of disappearance of the toxicity. The Division may require the permittee to <br />develop and submit additional information which may include, bw is not limited to, the remhs of additional testing. <br />If no pauern oftoxicity is identifed or recurring toziciry is not identified, the toxinry incident response is considered <br />closed and normal WET testing shall resume. <br />p Corrected 7f~/25/97 <br />• Amendmem No. I IssuedJU1 7 g igg~ Effective S~~ k~-~~~~ <br />