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PARTI Page No. 4 Permit No: CO-0034142 DEFINITION OF EFFLUENT LIMITATIONS (Continued) Outfalls 023 Flow, MGD 0.012 N/A Report BODs, tng/t (#/day) 30 (3.0) 45 (4.5) N/A Total Suspended Solids, rng/1 (#/day) 75 (7.5) 110 (11.0) °:N/A Oil and Grease, mg/1 N/A N/A `" 10 pH, s.u: (Minimum-Maximum) N/A N/A 6.5-9.7 Salinity, mg/1 Report N/A Report TRC, mgllC N/A N/A 0.5 Fecal Coliform, urg/1 6,000 12,000 N/A 2. Burden of Proof Requirements The permittee has the burden of proof when seeking relief from total suspended solids (TSB), total iron, and/or settleable solids (SS) limitations. Relief may be granted separately for each dischazge occurrence only when necessary and shall not be granted when the permittee has control over the discharge. The permittee should endeavor to meet the primary limtations whenever possible. The permittee will need to show that exceedence of the applicable ]imitations were caused by.precipitation and no outer source and that the dischazge was beyond their control. Manualdewatering of Ore ponds shall meet TSS and total iron litnitatians unless it is the only method of dewatering. In such cases, manual dewatering is eligible for alternate limitations as is automatic dewatering and the following demonstrations shall apply. a) For rainfall: to waive TSS and total iron limitations, it is necessary to prove that discharge occurred within 48 hours after measurable precipitation has stopped. In addition, to waive settleable solids limitations; it is necessary to prove that discharge occuned within 48 hours after precipitation greater than the ]0-year, 24-hour, event has stopped. b) For snowmelt, to waive TSS and total iron ]imitations, it is necessary to prove that discharge occurred within 48 bows after pond itttlow has stopped. In addition, to waive setileable solids limitations, it is necessary to prove that dischazge occurred within 48 hours after pond inflow volume greater Oran the 10-year, 24-hour event has stopped. Should a precipitation event or snowmelt occur, the perznittee shall submit adequate proof in order foran exemption to be claimed. Said proof shall be submitted as an attachment to the Discharge Monitoring Report (DMA) for,.tht appropriate period. The Division shall detentrine the adequacy of proof. As part of this determination, the Division shall evaluate whether the permittee could have conttolled the discharge in such a manner that primary limitations could have been met. ~, 3. Whole Efllvent Toxiciri Testine Requirements -Chronic WET Testinl?-Outfalls 003. 022, and 024 (a) Testing and Reorting Reouirements Test results shall be reported on the Discharge Monitoring Report {DMR) submitted for the reporting period during which Ore sample was taken. (i.e., WET testing results for the calendaz quarter ending March 31 shall be reported with Ore DMR due Apri128.) The results shall also be submitted on Ore Chronic Toxicity Test report form, available from the Division. Copies of these reports are to besnbmitted to both the Division and EPA alotrg with the DMit The pennittee shall conduct each chronic WET test in general accordance with methods descnbed Short Tenn Methods Sox Estimating the Chronic Toxiciri of Effluents and Receiving Waters to Freshwater Organisms, EPA/600/4-89/001 or most current editions, except as modified by the most tortoni Division guidance document entitled Guidelines for Conductinr Whole Ellluent Toxiciri Tests. The permittee shall conduct such tests using Ceriodaphnia dubia and fathead minnows.