2018-08-16_REVISION - M2012032 - Laserfiche WebLink

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PART I Page 7 of 26 Permit No.:CO0000003 Evaluation(TIE or TRE)is being performed,unless otherwise exempted, in writing,by the Division. Notification must be received by the Division within 14 calendar days of the permittee receiving notice of the WET testing results. c. Automatic Compliance Response The permittee is responsible for implementing the automatic compliance response provisions of this permit when one of the following occurs: • there is a violation of the permit limit(both the NOEL and the IC25 endpoints are less than the applicable IWC) • two consecutive monitoring periods have resulted in failure of one of the two statistical endpoints(either the IC25 or the NOEL) • the permittee is otherwise informed by the Division that a compliance response is necessary When one of the above listed events occurs,the following automatic compliance response shall apply. The permittee shall either: • conduct accelerated testing using the single species found to be more sensitive • conduct a Toxicity Identification Evaluation(TIE)or a Toxicity Reduction Evaluation(TRE)investigation as described below. i. Accelerated Testing If accelerated testing is being performed,testing will be at least once every two weeks for up to five tests,running only one test at a time,using only the IC25 statistical endpoint to determine if the test passed or failed at the appropriate IWC. Accelerated testing shall continue until; I 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 or three of five tests pass, in which case no pattern of toxicity has been found. Note that the same dilution series should be used in the accelerated testing as was used in the initial test(s)that result in the accelerated testing requirement. If accelerated testing is required due to failure of one statistical endpoint in two consecutive monitoring periods,and in both of those failures it was the NOEL endpoint that was failed,then the NOEC shall be the only statistical endpoint used to determined whether the accelerated testing passed or failed at the appropriate IWC. Note that the same dilution series should be used in the accelerated testing as was used in the initial test(s)that result in the accelerated testing requirement. If no pattern of toxicity is found the toxicity episode is considered to be ended and routine testing is to resume. If a pattern of toxicity is found,a TIE/TRE 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. The permittee shall provide written notification of the results within 14 calendar days of completion of the Pattern of Toxicity/No Toxicity demonstration. ii.Toxicity Identification Evaluation(TIE)or Toxicity Reduction Evaluation(TRE) If a TIE or a TRE is being performed,the results of the investigation are to be received by the Division within 180 calendar days of the demonstration chronic WET in the routine test,as defined above,or if accelerated testing was performed,the date the pattern of toxicity is demonstrated. A status report is to be provided to the Division at the 60 and 120 calendar day points of the TIE or TRE investigation. The Division may extend the time frame for investigation where reasonable justification exists. A request for an extension must be made in writing and received prior to the 180 calendar day deadline. Such request must include a justification and supporting data for such an extension. Under a TIE,the permittee may use the time for investigation to conduct a preliminary TIE(PTIE)or move directly into the TIE. A PTIE consists of a brief search for possible sources of WET,where a specific parameter(s)is reasonably suspected to have caused such toxicity,and could be identified more simply and cost effectively than a formal TIE. If the PTIE allows resolution of the WET incident,the TIE need not necessarily be conducted in its entirety. If,however,WET is not identified or resolved during the PTIE,the TIE must be conducted within the allowed 180 calendar day time frame.