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PERMIT, PART I Page le of 13 Permit No. CO-0034142 The first ri in signed copy of each dischazge monitoring repoR (DMR) shall be submitted to the Division at the following address: Colorado Department of Health Water Quality Control Division Permits and Enforcement Section WQCD-PE-B2 4300 Cherry Creels Drive South Denver, Colorado 80222-1530 The first duplicate signed copy of each discharge monitoring report (DMR) shall be submitted to the following agency: U.S. Enviroamental Protection Agency Water Management Division NPDES Branch 8WM-C 999 18th Street, Suite 500 Denver, CO 80202-2466 3. Frequency and Sample Tvpe - Acute WET TestinE Quarterly test results shall be reported along with the Discharge Monitoring Report (DMR) submitted for the end of the reporting calendar quarter (i.e., WET testing results for the calendar quarter ending Match 31 shall be reported with the DMR due April 28, with Ure remaining WET testing reports submitted with DMRs due each July 28, October 28 and January 28). The results shall be submitted on the Acute Tonicity Test report form, available from the Division. Copies of these reports are to be submitted to both the Division and EPA. The permittee shall conduct each acute WET test in general accordance with methods described in the Division guidance document entitled Guidelines for Conductioe Whole Effluent Toxiciri Tests. The perrnittee shall conduct an acute 48-hour WET test using Ceriodanhnia sp., and an acute 96-hour WET test using fathead minno~HS. Acute tests will be replacement static tests of a single effluent grab sample. 4. Accelerated WET Testin¢ If an individual toxicity test shows toxicity at any concentration less than or equal to the following Instream Waste Concentration (IWC) or if SO;fi species mortality in any dilution (including 100% effluent) is detected in any acute WET test conducted in accordance with this permit, the permittee shall notify the Division verbally within 24 hours and in writing (date of receipt) within 5 days of receipt of written lab test results and proceed with the following compliance schedule. Within 7 days of becoming aware of the toxicity, the permittce 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 permittee will continue such testing with one species until 2 consecutive weekly tests demonstrate no acute toxicity or a maximum of 5 weekly tests have been conducted. if no acute toxicity was demonstrated in the 2 consecutive weekly tests or in 3 of the 5 weekly tests, the permittee shall resume routine quarterly testing. In all other cases, a pattern of toxicity has been demonstrated and the permittce shall proceed with the Preliminary Toxicity investigation. When a pattern of toxicity is demonstrated, the permittee shall orally notify the Division within 24 hours: of becoming aware of the test result which demonstrates the pattern of toxicity and in writing within 5 days (date of receipt) after receiving [he written lab test result which demonstrates the pattern of toxicity.