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Pnxrt Page No. 7 Permit No.: CO-0038776 5. Acute WET Testine - Ouffalls 004. 011. 012.013. 016. and 017 (continued) permittee that is required to wm~ documents, or as subse A third documenT in this series is Methods for A untie Toxici Identification Evaluations Phase III Toxici Confimration Procedures, EPA/600/3-88/036 Feb. 1989. As m rented y e title, this proce ure is mten ed to co u-nr that a suspecte toxicant rs tnrly the toxicant. This investigation is optional. Within 90 days of the determination of the toxicant or no later than 210 days afer demonstration of toxicity, whichever is sooner, a control program is to be developed and received by the Division. The program shall set down a method and procedure for elimination of the toxicity to acceptable levels. e. Request For Relief The permittee may request relief from further investigation and testing where the toxicant has not been determined and the Division has determined snitable treatment does not appear possible. 1n requesting such relief, the permittee shall submit material sufficient to establish the following: i. It has complied with terms and conditions of the pemmt compliance schedule for the PTLTIE investigation and other appropriate conditions as may have been required by the Division; ii. Duringg the period of the toxicity incident it has been incompliance with all other permit conditions, including, in the case of a POTW, pretreatment requirements; iii: During the period of the toxicity incident it hat properly maintained and operated all facilities and systems of treatment and control; and iv. Despite the circumstances described in paragraphs i. and iii. above, the sotuce and/or cause of toxicity could not be located or resolved. If deemed appropriate by the Division, the permit or the compliance schedule maybe modified to revise the ongoing monitoring and toxicity mveshgahon requirements to avoid an unpproductive expenditure of the pemuttee's resources, provided that the underlying obligation to ehmmate any continuing exceedance of the toxicity limit shall remain. f Spontaneous Disappearance If toxicity spontaneously disapppeazs at any time after a test failure, the permittee shall notify the Division in writing within 14 days of a demonstration of disappeazance of the toxicity. The Division ma require the pemrittee to develop and submit additional information, which may include but is not limited to, the results of additional testing. If no pattern of toxicity is identified or recurring toxicity is not identified, the toxicity incident response is considered closed and normal WET testing shall resume. g. Toxicity Reonener This permit say be reopened and modified (following proper a&-ninisttative procedures) 'o include new cotaphance dates, additional or modified numerical permit limitations, a new or different compliance schedule, a change in the whole effluent toxicity testing protocol, or any other conditions related to the control of toxicants if one or more of the following events occur: i. Toxicity has been demonstrated in the effluent and the permit does not contain a toxicity limitation. ii. The PTU'TIE results indicate that the toxicant(s) represent pollutant(s) that maybe controlled with specific numerical limits, and the Division agrees that the numerical controls aze the most appropriate course of action. iii. The PTUTIE reveals other unique conditions or chazacteristics which, in the opinion of the Division, justify the incorporation of unanticipated special conditions in the permit. B. MONITORING REQUII2EMENTS 1. Freouencv and Sample Type In order to obtain an indication of the probable compliance or noncompliance with the effluent limitations specified in Part LA.1, the permittee shall monitor all effluent pazameters at the following frequencies. Such monitoring will begin immediately and last for the life of the ppemdt unless otherwise noted. The results of such monitoring shall be reported on the Dvschazge Monitoring Report form (See Part I.E.). a. Outfalls 004 and 016 'sue..- ~~~ :~:.-- - _ -- ... ~ftUrenf ar eter _ ~ .: ryn , n. 44aE . PS _altr ~ - ~ .. -...~ low, MGD ~~ - s - ~ , ~Nen ~ . r • „ ,~ -_., s Once er week QT - S+d-~:- - ~ ~~ ...: _ep~. _ ..:. Instantaneous or Continuous Total Sus ended Solids TSS , m Once er month Grab otal Iron, u Once er month Grab ettleable Solids, ml/1 Once er month Grab otal Residual Chlorine, Ouffa11004 Onl Once er week Grab H, s.u. ,n;.,;rr,~,.r,-maximum Once er week In-situ Reviad a1192D0a