2011-11-30_PERMIT FILE - C1981008 (5)

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PART I Page No. IS Permit No.: CO-0000213 The permittee may use the time for investigation to conduct a PTI or move directly into the TIE. APTI 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 forma] TIE, If the PTI allows resolution of the WET incident, the TIE need not 4b. Chron1cff,'ETTestk -Out q1ffsj: 007, 011, and 013 with New WET Polky APP&d a, General Chronic WET Testing and Reporting Requirements The permittee shall conduct the chronic WET test using Ceriodaphnia dubia and flimephalesproinclas, as a static renewal 7- day test using three separate grab samples. The permittee shall conduct each chronic WET test in accordance with the 40 CYR Part 136 methods described in 'Short-term Methods for Estimatina the Chronic ToNiq"Liffluents, and Receiving: Water to Frgthwater Organisms, Fourth Edition, October 2002 (EPA - 821 -R -02 -013) or the most current edition, Jhe following minimum dilution series should he used: 0% effluent (control), 20%,40%, 6011/o, 80%, and 100% effluent. If the permittee uses more dilutions than prescribed, and accelerated testing is to be performed, the same dilution st�ricsshall be used in the accelerated testing (if applicable) as was initially used in the failed test. Tests shall be done at the frequency listed in Part I.B. Test results shall be reported along with the Discharge Monitoring Report (DMR) submitted for the end ofthe reporting period when the sample was taken. (i.e., WET testing results for the calendar quarter ending March 31 shall be reported with the DMR due April 28, etc.) The permittee shall submit all laboratory statistical summary sheets, summaries of the determination of a valid, invalid or inconclusive test, and copies of the chain of custody forms, along with the DkN4R for the reporting period. If a test is considered invalid, the permittee is required to perform additional testing during the monitoring period to obtain a valid test result. I-ail tire to obtain a valid test result during the monitoring period shall result in a violation of the permit for failure to monitor. b. Violations of the Permit Limit, Failure of One Test Statistical Endpoint and Division Notification A chronic WET test is considered a violation of a permit limitation when both the NOEL and the IC25 are at any effluent concentration less than the IWC, The IWC for this permit has been determined to be 100% effluent. A chronic WET test is considered to have failed one of the two statistical endpoints when either the NOFC or the IC25 are at any effluent concentration less than the IWC. The IWC for this permit has been determined to be 100% effluent, In the event of a permit violation, or when two consecutive reporting periods have resulted in failure of one of the two statistical endpoints (regardless of which statistical endpoints are failed), the permittee must provide written notification to the Division. Such notification should explain whether it was a violation or two consecutive failures of a single endpoint, and must indicate whether accelerated testing or a Toxicity Identification Evaluation or Toxicity Reduction 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 pen-nit when one of the following occurs: • there is a violation of the permit limit (both the NOEC 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 othenvisc 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 pennittee shall either: • conduct accelerated testing using the singh., species found to be more sensitive