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PART? Page No. 4 Petmit No. CO-0045080 • A. DEFIlVITION OF EFFLUENT LIlpIITATIONS 1. R111uent Limitations (continued) b. Outfalls 004. 011. 013 Effluent Parameter Flow, MGD Total Suspended Solids, mg/¢ Total Iron, mg/¢ Oil and Grease, mg/¢ pH, s.u. (minimum-maximum) Whole Effluent Toxicity, Acute 2. Surden of Prnnf Requirement DischarEe Limitations 30-Dqy Avg ai Repot Report 35 70 3.0 6.0 Report 10 Report 6.5-9.0 Repot[ LCso> 100% The permittee has the burden of proof when requesting relief from total suspended solids (TSS), total iron and/or settleable solids limitations. Relief shall be granted only when necessary and shall not be granted when the permi[tee has control over the dischazge. The permittee should endeavor to meet the primary limitations whenever possible. The Division shall have fmal authority in determining whether relief is granted. Discharges from all outfalls are eligible for this exemption; however, the majority of the loading from any dischazge has to consist of storm tvnoff for the relief to be available for any discharge. Outfalls 004, 011 and 013 are not eligible for this relief. a For rainfall, to waive TSS and total iron limitations, it is necessary to demonstrate that dischazge occurred within 48 • hours after measurable precipitation has stopped. To waive settleable solids limitations, it is necessary to prove that discharge occurred within 48 hours after precipitation greater than the 10-year, 24-hour event has stopped. b. For snowmelt, to waive TSS and total 'iron limitations, it is necessary to demonstrate tha[ discharge occurred within 48 hours after pond inflow has stopped. To waive settleable solids limitations, it is necessary to prove that dischazge occurred within 48 hours after pond inflow volume greater than the 10-year, 24-hour event has stopped. Should a precipitation event or snowmelt occur, the permittee shall submit adequate proof is order for an exemption to be claimed. Weather sta[ion data may be appropriate in making this demonstration. Said proof shall be submitted as an attachment to the Discharge Monitoring Report (DMR) for the appropriate period. The Division shall determine the adequacy of proof. As part of this detertnination, the Division shall evaluate whether the permittee could have controlled the discharge W such a manner that primary limitations could have been met. All manual dewatering of ponds that are equipped with automatic dewatering systems must meet TSS and total iron limitatiotu. If a pond has only manual dewatering capability, relief is available only to the extent required to regain necessary stability and capacity. 3. Poc_t-Mining Areas Commencing at the time active mining has ceased and surface azeas have been resumed to the required contour and revegetation has begun, applicable dischazges may be eligible for limitations other than those specified in Para I.A. t. These post-mining limitations shall remain in effect until bond release. The permittee shall notify the Division at the appropriate time so that consideration of permit modifications can be made. 4. Whole Effluent Toxicity Testing Rgquirement (Acutel - Outfalls 004. 011 and 013 a. Testine and Reporting Requirements • Tests shall be done at the frequency listed in Part f.B.l. Test results shall be reported along with the Dischazge 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 with the DMR due April 28.) The results shall be submitted on the Acute Toziciry Test report form, available from the Division. Copies of these reports are to be submitted to both the Division and EPA along with the DMR. See Part [.C. for Definitions.