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• ..:. ._ ~ PART lI - Page 9 ' Permit No.CO-0038024 B. MONITORING REQUIREMENTS ' 3. Amin WFT Trcting=Qi~ifal1c 004r 074, anr107fi (coA[inued) (ii) conduct accelerated testing using [he single species found [o be more sensitive. If accelerated testing is being performed, the permittee shall provide written notification of the results within 14 calendar days of completion of the "Pattern of Toxicity"/"No Toxicity" demonstration. Testing will be at least once every two weeks for up [o five tests until 1) two consecutive tests fail or three of five tests fail, in which case a pattern of toxicity has been demonstrated or, 2) two consecutive tests pass of three of five tests pass, in which case no pattern of toxicity has been found. IF no pattern of toxicity is found, the toxicity episode is considered to be ended and routine testing is to resume. Ifa pattern E of toxicity is found, a PTUT[E investigation is to be performed. If a pattern of toxicity is not demonstrated but a significant ' level of erratic toxicity is found the Division may require an increased frequency of routine monitoring or some other ' modified approach. (d) PTrrrrF The m<nltc of the PTT/TTF invectia~atinn are to he mreived by the 1)ivicinn 'th' 170 d• f fhr d it f f t WFT in the rnntine tect as defined above nr if accelerated testing is rrfnrmr the date the pattern of tnxi 'tv ' dmm~ndrated A ctamc report is to he rnvided to the Tlivicinn t the AO 60 aid Oa day n i f th PTTff1F ' ~igafi The Division may extend the period for investigation where reasonable jusfification exists. A rcqucst for an extension must be made m wilting and received before the 120-day deadline. Such request must include a justificatton and supporting data for such an extension. • The pemdttee may use the time for investigation [o conduct a PT'i or move directly into the TIE. A PTI consists of a brief search for possible sources of WET, which might reveal causes of such toxicity and appropriate corrective actions more simply and cost effectively than a fomrat TIE. If the PTI allows resolution of [he WET incident, the TIE need not necessarily be conducted. If, however, WET is no[ identified of resolved during the PTI, the TIE must be conducted within the allowed 120-day period. t, Any permittee that is required to conduct aPTI/TIE investigation shall do so in conformance with procedures identified in f- the following documents, or as subsequently updated: 1) Merhnds for Aouatir Tnxitity Identification Fvalna}innq, Phace i Tn~tyS'haracteriratinn Prnrrdnrec, EPA/600/6-91/003 Feb. 9l and 2) Methods for An~'arie TnxicitTldnntifiratinn Fvalnatinn5 Phace Ii Tnxirit$ identi£catinn Prnredurec, EPA/600/3-88/03$ Fell. 1989. A third document in this aeIles is Methnde for Ammtic Toxicity TdentifieaHn F ahtafinne PI ac iTI Tn 'r~n~ t' f t' Prncednrec, EPA/600/3-88/036 Feb. 1959. As indicated by dre title, this procedure is intended [o confum that the suspected toxicant is tmly the toxicant. This investigation is optional. - Within 90 days of [he determination of the toxicant or no later than 270 days after demonstration of toxicity, whichever is sooner, a control program is to be developed and received by the Division. The progmm shall set down a method and procedure for elimination of the toxicity [o acceptable levels. (e) $~g7tect Fnr Relief The permittee may request relief from further investigation and testing where the toxicant has not been determined and the Division has detemtined suitable treatment does not appear possible. In requesting such relief, the permittee shall submit material sufficient to establish the following: (i) It has complied with terms and conditions of the pemtit compliance schedule for the PTIlCIE investigation and ocher appropriate conditions as may have been required by the Division; (ii)During the period of the toxicity incident it has complied with al] other pemut conditions, including, in the case of a POTW, pretreatment requirements; (iii) During the period oC the toxicity incident i[ has properly maintained and operated all facilities and systems of treatment • and control; and (iv) Despite the circumstances described hr paragraphs (i) and (iiti) above, the source and/or cause of toxicity could not be located or resolved.