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A. TERMS AND CONDITIONS <br />PARTI <br />Page 10 <br />Permit No. CO-0000221 <br />4. Whn1r Ffllnrnt TntiriW Trcfirlg~gnirrrnrMC ( nn~ _ fhrtfal c M7,r IM1lr OIIS~,gI(jr 010 and Oll~onfin _nnr[1 <br />The permittee may rue the time for invutigation to conduc[ a PTI or move dtrecily into the TIE. A PTI consists of a brief <br />search for possible sources of WET, which might reveal causes of such toxicity and appropriate cortective actions more <br />simply and cost effectively than a formal TIE. If the PTI allows ruolution of the WET incidem, the TIE treed not <br />necessarily be conducted. if, however, WET is not idetttified or resolved during the PTI, the Tom, must be conducted <br />within the allowed 120 day time frame. <br />Any permittee that is required to conduct a PTIR'fE investigation shall do so in epnfor**,anrr with procedures :identified in <br />the fOIIOWing dOCttmenLS, 0I as SnbStgllendy Upda[ed: 1) blethndc fnr Atp,arir Tnxirity Idrntificatinn Fvah,arii7nc Phace 1 <br />Tmiri~ ararreri>arinn PrnreAnrec, EPA/600/6-91/003 Feb. 91 and 2) Mrthodc fnr Am,atir Tnxiri rntifir2tiOn <br />Fvalnatinnc, Phace P Tnxic_ty ldentificarinn Prncednme, EPA/600/3-8$/035 Feb. 1989. <br />A third dOCttmen[ ]n Ih15 SCrleS 15 MEthndc fnr Am,adc TnxiritX Identificalinn Fvah,atinnc PhasrII[ Tnxrcity (;nnfjrmypnn <br />Prnrednrrx, EPA/600l3-881036 Fcb. 1989. As indicated by the tiile, :Ivs procedure is intended to confvm Char. ille <br />suspected toxicant is truly the toxitant. This investigation is optional. <br />Within 90 days of the determination of the toxicant or no later iltan 210 days aher demonstration of toxicity, whichever is <br />sooner, a comtrol program is to be developed and received by the Division. The program shall set down a method and <br />procedure for elintinadon of the tonicity to acceptable levels. <br />e. Rr<nnrct Fnr Relirf <br />The pcrmittee may request relief from further investigation and testing where the toxicant has not been determined and • <br />Division has determined suitable treatment does no[ appear possible. !n requesting such relief, the permittee skull submt. <br />material sufficient to establish the following: <br />i. It has complied with terms and conditots of the pecmi[ compliance schedule far the PTIrI7E investigation and other <br />appropriate conditions :ts may have been required by the Division; <br />ii. During the period of the toxicity incident it has been in compliance with all other permit conditions, including, in the <br />case of a POTW, pretreatment requiremems; <br />iii. Durittg tbe period of the toxicity incident i[ has properly maintained and operated all facilities and systems of <br />treatment and control; and <br />iv. Despite the circumstances described in pazagraphs (i) and (iii) above, the sottrce and/or cause of toxicity <br />could no[be located or resolved. <br />If deemed appropriate by the Division, the permit or the compliance schedule may be modified to revise the oni;oing <br />monitoring and toxicity investigation requirements [o avoid an tmproductive expenditure of the permittee's resources, <br />provided that the underlying obligation to eliminate any continuing exceedance of the toxicity limit shall remain. <br />f, 'nnntanrMlf nlCa,~n„praranrr <br />If toxicity spontaneously disappeazs at any time after a test failure, the permittee shall notify the Division in writing within <br />14 days of a demonstration of disappeazance of nc~ toxicity. The Division may require the permittee to develop and <br />submit additional information which tray include, but is no[ limited to, the results of additional testing. If no pattern of <br />toxicity is identified or recurring toxiciq~ is not identified, the toxicity incident response is considered closed anti normal <br />WET testing shall resume. <br />Cortected <br />