2001-12-11_PERMIT FILE - C1980007A (4)

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PART I Page l0 Permit No. CO-0038776 ~ONTTORING REQUIREMENTS 3. Acute WET Testine - Outfalls 002. 004. 011 and 013 fcontinoedl The pertrtittee shall conduct an acute 48-hour WET tat using Ceriodaohnia sp., and an acute 96-hour WET tat using fathead minnows. Acute tau will be replacemem static tart of a single effluent grab sample. The permittee shall conduu each acute WET tat in general accordance with methods described in Methods for Measurine the Acute Toxicity of Efflurnu and Receivine Waters to Freshwater and Marine Oreanisrru, F.PA/tt00/4-90/027 or the most current edition, except as modified by the most current Division guidance document entitled Guidelines for Conducin¢ Whole Efflurnt Toxicity Tact. (b) Failure of Tat and Division Notification Aa acute WET tat is failed whenever the LCD, which rcprarnu an atitnate of the effluent conccntradon which is lethal to 5090 of the tat orgaaistns in the time period prauibed by the tat, is found to be less than or equal m 100% effluent. The permittee must provide written aodficadon of the failure of a WET tat to the Division, along with a statemrnt as co whether the Preliminary Toxicity Incident ('PTI')/Toxiciry Identification Evaluation (TIE') investigation or aceeletated [acing is being performed (see trot secion). Notification must be received by the Division within 14 plendar days of the demonstration of acute WET is the routine required test. 'Demoostrazion' for the purposes of Pate [.B.4(b),(c),(d) and (t) meam no late[ than the last day of the Iaborazory tat. (c) Auromatic Compliance Schedule Upon Failure of Tat tf a routine sate WET tat is failed, the following automatic compliance schedule shall apply. As part of this the • permittee shall either: (i) proceed m conduct the 1?1VTIE investigation as destnibed in Pan I.B.4.(d), or (u) condtut accelerated taring using the single species found to be mate sensitive. ff accelerated testing fs being performed, the permittee shall provide written notiCrrtion of the ttsolts within 14 calendar days of completion of the "Pattern of Toxicry"!"No Toxicity" demonstration. Toting will be az least once every two weeks for up to five [au until 1) two consea[ive tau fail or three of five tau Coil, in which case a pazum of roxiciry hat bees demonstrated or, 2) two wruecutive tau pass or three of five tau pass, in which case no pattern of toxicity bat bees found. If no pattern of toxicity is found the toxicity episode is comidered [o be ended and routine rating is to resume. If a paztem of toxicity is found, a PTVTIE investigation is m be performed. If a paztem of toxicity is not demonstrated but a significant level of erratic mxiciry is found, the Division may requite an increased ftequrnry of routine monimring or some other modified approach. (d) IT~F The ttsults of the PTI/TIE investigation are to be received by the Division within l20 days of the demortstrrtion of acute WET in the routine tat, as defined above. or if accelerated testine is orr[ormed, the date the pattern of toxiciri is demonstrated. A statttt report is to be provided to the Division at the 30. 60 and 90 day [wino of the PTI/TIE investieation. The Division may extend the time frame far investigation where reasonable justificazion exisu. A rcquat for an extwsion ttwst be made in writing and received prior to the 120 day deadline. Such request must include a justifirazion and supporting data for such an extension. The permittee may use the time for invatigatian to conduct a PTI or move directly into the TIE. A PTI consists of a brief search for possible source of WET, which might reveal causes of such toxicity and appropriate corrective actions more simply and cost effectively than a formal TIE. If the PT[ allows raolurion of the WET incident, the TIE need not necessarily be conduced. If, however, WET is not identified or resolved during the PTI, the TIE must be conduced within the allowed 120 day time frame. Amendment No. 2 Issued FEB ~ 9 I99JEffective APR 0 1 1997