2007-11-19_HYDROLOGY - M2007044 - Laserfiche WebLink

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PARTI Page No. 4 Permit No.: CO-0047562 2. Whale Effluent Toxicity -Chronic Lethality Limitation Beginning on the effective date and lasting through the expiration date, there shall be no statistically significant difference in lethality (at the 95% confidence level} between flee control and any effluent concentration Less than or equal to 100.00% effluent. Suelt linrtitation shall apply as a daily maximum. See Part I.C. far Definitions. 3. Chronic VET Testing-Outfall(sl: OOl~+i a. Testing and Reporting Requirements Tests shall be done at the frequency listed in Part I.B.1. Test results shall be reported along with the Discharge Monitoring Report (DMR) submitted for the reporting period during which the sample was taken. (i.e., WET testing results for the first calendar quarter ending March 31 shall be reported v,~ith the DMR due April 28.) The results shall be submitted on the Chronic Toxicity Test report form, available from the Division. Copies of these reports are to be submitted to both the Division and EPA along tivith the DMR. The permittee shall conduct each chronic WET test in general accordance with methods described in Short Term Methods for Estimating_the Chronic Toxicity of Effluents and Receivina`Waters to Freshwater Or ag nisxns, EPA/600/4- 89/001 or the most current edition, except as modified by the most current Division guidance document entitled Guidelines for Conducting Whole Effluent Toxicity Tests. The permittee shall conduc# such tests using Ceriodaphnia dubia and fathead nuunows. b. Failure of Test and Division Notification Beginning on the effective date of the permit, a chronic WET test is failed whenever there is a statistically significant difference in lethality between the control and any effluent concentration less than or equal to the instream waste concentration (IWC}. The I~'VC for this permit has been determined to be 100%. The permittee must provide written notification of the failure of a WET test to the Division, along with a statement as to whether a Preliminary Toxicity Investigation (PTI)/Toxicity Identification Evaluation (TIE) or accelerated testing is being performed. Notification nmst be received by the Division within 21 calendar days of the demonstration of chronic'4VET in the routine required test. Demonstration for the purposes of Parts I.A.3.b., c., d., e. and g. means no later than the last day of the laboratory test. c. Automatic Compliance Schedule Upon Failuue of Test If a routine chronic WET test is failed, the following automatic compliance schedule shall apply. As part of this, the pernvttee shall either: i. Proceed to conduct the PTUTIE investigation as described in Part I.A.3.d., or ii. Conduct accelerated testing using the single species found to be more sensitive. If accelerated testing is being performed, the pernuttee shall provide written notification of the results within 14 calendar days of completion of the Pattern of Togicity/No Tonicity demonstration. Testing will be at least once every hvo weeks for up to five tests until; 1) rivo consecutive tests fail or three of five tests fail, in which case a pattern of toxicity has been demonstrated or 2} rivo consecutive tests pass or three of five tests pass, in which case no pattern of toxicity has been found. 1f 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 PTI/'TiE 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. PTI/TIE The results of the PTIIT]E investigation are to be received by the Di~~ision within 120 days of the demonstration of chronic WET in the routine test, as defined above, or if accelerated testing fs performed, the date the pattern of toxicity is demonstrated. A status report is to be provided to the Division at t}te 30, 60 and 90 day points of the