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PART I Page vi Permit No. CO-0000213 A. TERMS AND CONDTfIONS 1. Effluent Limitations (continued) (d) Burden of Proof Requirements (continued) 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 accessary to prove Wet discharge occurred within 48 hours after precipitation greater than the ]0-year, 24-hour event has stopped. b) For snowmelt to waive TSS end total iron limitations, it is necessary to prove that discharge occurred within 46 hours rafter pond inflow bas slopped. In addition, m waive settleable solids limitations, it is necessary to prove Wat discharge occurred within 48 hours after pond inflow volume greater than the 10-year, 24-hour event has stopped. Should a precipitation event or anowmelt occur, We permittce shall submit adequate proof is order for as exemption to be claimed. WeaWer station data may be appropriate is making Wis demogstration. Said proof shall be submitted as an attachment to We Discharge Monitoring Report (DMR) for We appropriate period. The Division shall determine We adequacy of proof. As part of this determination, We Division shall evaluate whether We permittee could have controlled the discharge in such a manner that primary limitatiogs could have been met. All ~ manual dewa[eriag of We ponds shall meet TSS end total iron limitations (outfalls 001 and 007ror settleable solids IimiUtioas (outfalls 002, 003, 004, 1105 and 006). 2. Comoliance Schedule-Salinity The permittce shall submit to We Division by Mav 1. 1995, s report addressing We economic feasibility of achieving ao salt in all discharges or, if Wat is ao[ feasible, minimiting We sal[ in all discharges from this facility. The report shall address Wese two points: The cost of modifying all existing treatment facilities to provide for no salt discharge; The cost of salt miaimi7ation from all treatment facilities (to achieve combined discharge equal to or less Wan one ton of TDS per day). The permittce shall specifically address a minimum of three forms of treatment and/or containment for each point. The report shall describe in detail each form of treatment and/or containment, We associated construction vests, We amual operating costs and We expected resulting sal[ loading that would result from such treatment and/or coataiumeat. The Division will review Wis report. If We Division determines Wat it is economically infeasible m construct salt removal/miaimi7ation facilities, We permittce will be judged to have fully satisfied We terms of Wis requirement and no further action shall be required. If We Division determines Wet such construction is necessary, We permit may be reopened to make appropriate modifications. No later Wan 14 calendar days following each date identified is We above schedule of compliance, We permittee shall submit eiWer a report of progress or, in We case of specific actions being required by identified dates, a written notice of compliance or noncompliance, any remedial actions taken, and We probability of meeting We next scheduled requirement. Ia any case is which a compliance schedule has been timely submitted, failure to obtain We Divisioq's approval shall not be considered a violation of We permit unless We Division shows Wat absence of approval or disapproval has resulted from We failure of We permittce [o famish information reasonably required or requested in order to process We compliance schedule. PIDaP d/9/93