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PARTI <br />Page No. 5 <br />Perrttit No. CO-0000906 <br />DEFINITION OF EFFLTJEAt'I' LIMITATIONS <br />~, Arse WFT Testing - (hrtfalla 007 and 009 (contimred) <br />(i) proceed to conduct the PTI/TIE investigation as described in Part I.A.2.(d), or <br />(ii) conduct accelerated testing using the single species found m be more sensitive. <br />If accelerated testing is being performed, the permittee shall provide written notification of the results within 14 calendaz days of <br />completion of the "Pattern of Toxicity"P'I3o Toxicity" demonstration. Testing will be at least once every two weeks for up to: <br />five tests until 1) tyro consecutive tests fail or three of five tests fail, in which case a pattern of toxicity has been demonshated or, <br />2) two consecutive tests pass or three of five tests pass, in which case no pattern of toxicity has been found. If no pattern of <br />toxicity is found, the toxicity episode is considered to be ended and routine testing is to resume. If a pattern of toxicity is found, <br />a PTLTIE investigation is to be performed. If a pattern of toxicity is not demonstrated but a significant level of erratic toxicity is <br />found, the Division may requrre an increased frequency of routine monitoring or somo other modified approach.. <br />(d) ffi(TSE <br /> <br />The resnlts of the PTTPI'iF investi~tinn are to h .received h~ the 17iviainn arithin 120 da~,f the derrw,natratinri of arnt4 WF.T <br />in the ren+tine tea(,~e defined ahnvg, or if accelerated tecNng is mod, the date the_nattem of toxirjty is demnnatrated A <br />atah,a ~~nnrt is in he nmvided to the 1)ivisinn at the 30 h0 and 90 da~pninta of the TYTTl1'IF invech_9afio~ The Djyjgjop may <br />exte~ the period for investigation where reasonable justification exists. A request for an extension must be made in writing and <br />received before the t20-day deadline. Such request ~tst include a justification and supporting data for such an extension. <br />The permittee may use the time for investigation to conduct a PTI or move directly 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 corrective actions more simply <br />a~ cost effectively than a formal TIE. If the PTI allows resolution of the WET incident, the TIE need not necessarily be <br />conducted. it; however, WET is not identified or resolved during the PTI, the TIE nnrst be conducted within the allowed 120 <br />day time frame. <br />Any'permittee that is required to conduct a PTI/ITE investigation shall do so in conformance with procedures identified in the <br />following documents, or as sirbsegrrently updated: 1) Methnda for Anratir Toxicity identification Fvah+atinnq~aae T Tnxirihr <br />~ara~terixetinn Prnrnfitma, "EPA/600/h-91/003 Feb. 91 and 2) Methnrta-for A r,atic Tnxicit; Tdentifi ati<in .vat +atinnq„fhaa <br />R Toxicity Tdentificatinn Prnendnres EPA/600/3-88/035 Feb. 1989. <br />A third document iII this series SS Methnda for A~+atic Toxi i identification F,yalnatinnq, Phase TTI Toxicity ('..nfim,ation <br />Frnced„res; EPA/600/3-88/036 Feb. 1989. AS indicated by the title, this procedure is intended to Confnm that the suspected <br />toxicanf is tnily the mxicant This investigation is optional, <br />Within 90 days of the deteratinafion of the toxicant or no later than 210 days after demonstration of toxicity, whichever is <br />sooner, a control program is to be developed and received by the Division. The program shall set down a method and procedure <br />for elimination of the torycity to acceptable levels. <br />(e) u eglreeat Fnr Relief <br />The pemtittee may request relief from further investigation and testing where the toxicant has not been determined and the <br />Division has determined suitable treatment does not appeaz possrble. In requesting such relief, the permittee shall submit <br />material sufficient to establish'the following: <br />(i) It has complied with terms and conditions of the permit compliance schedule for the PTIfITE investigation and the Division <br />may have requaed other appropriate conditions as; <br />(ii) During the pen'od of the toxicity incident it has complied with all other pemrit conditions, including, in the case of a POTW, <br />pretreatment requirements; <br />(iii) During the period of the toxicity incidem it has properly maintained and operated all facilities and systems of treatment and <br />control; and <br />