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PART <br />Page No. 16 <br />' <br />conduct aToxicdy Identification Evaluation! Toxicity Reduction £vWusbon(T|Gi[RF.) <br />investigation oxdescribed in this Section, <br />i AuocjeratedTestb�g <br />If accelerated testing ric <br />statistical end oint to determine if the test passed or failed at the ap <br />rol2riate JWC. Accelerated testing shall continue until; <br />l) two consecutive tests fail ur three nf five tests. fail, bowtiicb case s pattern of toxicity has been demonstrated or2)two <br />consecutive tests pass or throe u|^five toNLs pass, fn' which case nu pattern o[ toxicity has boanfbuod. Note that theuammo <br />dilutionseries should be used in the accelerated testing as was used in the initial test(s) that result in the accelerated testing <br />requirement. <br />If accelerated testing is required due to failure of one statistical endpoint in two consecutive monitoring periods, and in both <br />of those failures it was the NOLC endpoint that was failed, then the NOEC shall be the only statistical endpoint used to <br />determined whether the accelerated tmstinp- passed m, failed att the appropriate lWC. Note that the same dilution series should <br />be used in the accelerated testing as was used in the initial test(s) dial result in the accelerated testing requirement <br />If no pattern of toxicity is found the toxicity episode is considered to be ended and routine testing is to resume. [fa pattern of <br />vuxioi1yh found, uTlFJ7RS investigation \stmbo performed. lfu pattern oCtnxix(ty& not demonstrated but umigofiount <br />level of erratic toxicity ix found, the Division may require an increased fTequency of routine monitoring or some other <br />modified approach. The permittae shall provide written notification ofthe results within 14 calendar days wf completion oy <br />the Pattern uFTnxic|tyvNo Toxicity demonstration. <br />ii Toxicity Identification Evaluation (TIP) or Toxicity Reduction Evaluation (TRE) <br />IfnTlRorTKEi^ being performed. the results of the investigation are uobe received by the Division within }80 days, o[the <br />demonstration chronic WET in the routine test, as defined above, or if accelerated testing was performed, the date the pattern <br />uf toxicity imdemonstrated. A status report is to be provided to the Division at the 60 and 120 day points of the TIE or TRE <br />investigation. The Division may extend the time frame for investigation where reasonable justification exists. A request for <br />un extension must he made |n writing and received prior N the l8D day deadline, Such request must include a'uodficauiwn <br />and supporting data for such uoextension. <br />Under u TIE, the permitteemay use the time for investigation to conduct a preliminary ~ TIE (PTIE)or move directly into the <br />TIE. APTlF. consists ofm brief search for possible sources oy WET, where u specific pmoammtor(s)io reasonably suspected to <br />have caused such toxicity, and could beidentificd more simply and cost effectively than u formal TIE. lf the PT[Ballows <br />resolution of the WET incident, the TIE need not necessarily be conducted in its entirety. If, however, WET is not identified <br />wr resolved duriu� the PTlE, the TIE must becouduc�d`x�hin the eOwwod l80 day dnuu�ao�u. <br />[bm Division recommends that the EPA guidance documents regarding Il2mhe followed. {f another method iotobwused, <br />this procedure should be submitted to the Division prior to initiating the TIE. <br />If the pollutanifs) causing toxicity isJare identified, and islare controlled by a permit effluent limitation(s), this permit maybe <br />modified upon request to adjust permit requirements rvgnrding the automatic compliance response. <br />If die pollutant(s) causing toxicity Ware identified, and isiare not controLled by a permit effluent limitation(s). the Division <br />mu� develop limitations the pnrume1erfs\ and the permit may be reopened to include these limitations. <br />lf the pollutant causing toxicity iv not able uo6u identified, oris unable tohe specifically idautlfind.oris not able tobm <br />controlled \y -in effluent limit, the permitteu will 6e required to porfomnoitheT item lmitem 2 below. <br />|) Conduct an investigation which demonstrates actual instrearn aquatic life conditions upstream and downstream of the <br />discharge, or identif <br />y, for Division approval, and conduct an alternative investigation whiobdacuonatrmtemthnactuulingo:um. <br />impact. This should include W6Ttustin8aod chemical analyses oythe ambient water. Depending oo the results uy the study, <br />the permittee may also b.- required to identif� the control program necessary to eliminate the toxicity and its cost. Data <br />collected may be presented to the WQCC for consideration at the next appropriate triennial review of the stream standards-, <br />