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Part I Page lg of 19 Permit No. CC-0027146 B. MONITORING REQUIREMENTS 5. WET Accelerated Testine If an individual toxicity test shows toxicity ac any concentration less than or equal co the following Instream Waste Concentration (IWC) or if SOX species mortality in any dilution (including 100X effluent) is detected in any acute WET test conducted in accordance with this permit, the permictee shall notify the Division verbally within 24 hours and in writing (dace of receipt) within 5 days of receipt of written lab test results and proceed with the following compliance schedule. Discharge Point IWC aol o.lr. ooz o.lr. 004 100X Within 7 days of becoming aware of the toxicity, the permictee shall then begin weekly accelerated testing of the discharge with whichever species has proven (through the first instance of toxicity) to be the most sensitive. The oermittee will continue such testing with one species until 2 consecutive weekly tests demonstrate acute toxicity. 2 consecutive weekly tests demonstrate ne acute toxicity or a maximum of 5 weekly tests have been conducted. If no acute toxicity was demons crated in the 2 consecutive weekly tests or in 3 of the 5 weekly tests, the permitee shall resume routine quarterly testing. In all other cases, a pattern of toxicity has been demonstrated and the permittee shall proceed with the Preliminary Toxicity Investigation. When a pattern of toxicity is demons traced, the permictee shall orally notify the Division within 24 hours of becoming aware of the test result which demonstrates the pattern of toxic icy and in writing within 5 days (date of receipt) after receiving the written lab test result which demonstrates the pattern of toxicity. 6. WET Preliminary Toxicity Investigation The permictee will have 15 working days from the date of demonstration of the pattern of toxicity co complete a preliminary toxicity investigation and submit (date of receipt) the results to the Division, in writing. The "dace of demonstration" shall be the dace the permicte becomes aware of the final test result that established the pattern of toxicity. The preliminary toxicit~~ invesc:gacion may include, but is not limited co: additional chemical and biological monitoring, examination of pretreatment program records, examination of discharge monitoring reports, evaluation of treatment processes and chemical use, inspection of material storage and transfer areas co determine if a spill may have occurred, and similar procedures.