2001-12-11_PERMIT FILE - C1980007A (4)

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PART I Paged G Permit No. CO-0038776 TERMS AND CONDITIONS 2. Burden of Proof Requirements The permittee has the burden of proof when seeking relief from tarn! suspended solids (TSS), rotal iron aadlor settleable solids (SS) limitations. Discharge from outfalls 007, 011, 012 and 013 ate not eligible for this exemption. Outfalls 002 and 004 ate eligible for relief from TSS, total iron and SS; however, the majority of the loading from nay discharge has m consist of storm runoff foc the relief to be available. The pertaittex will need to show thaz exceedence oP the applicable titnitauom was caused by precipitazion and net mine water, through a comparison of the loading from each source. The rnn~ining permitted outfall5 (005, 006, 008, 009, 014 and Ols) are eligible for relief from TSS, T. Icon and SS az all times siaa only surface runoff duchatga an authorized from these outfatls. Relief may be granted for each discharge occurreaa oNy when necessary and shall not be granted when the permi[[ee has control over the discharge. The petmittce should endeavor to meet the primary limitations whrnevet possible. a) For rainfall. ro waive TSS and total 'trop limitadons, it is necesary to prove thaz discharge occurred within 48 hours after measttrable prexipitation has stopped. In addition. to waive settleable solids limitations, it is necessary to prove the[ discharge occurred within 48 boon after precipitation greats than the 10•yeaz, 24-hour event has stopped. b) For snowmelt. to waive TSS and total iron limitations, it u necessary to prove that dischazge occurred within 48 hours after pond inflow has stopped. Ice addition, m waive settleable solids limitatons, it is necessary to prove thaz discharge occurred within 48 hoots after pond inflow volume greazer than the l0-year, 24-hour event has stopped. Should a preeipitazioa event or snowmelt occur, the permittee shall subtni[ adtxltrate proof in order for as exemption to be claimed. Weather station data may be appropriate is making this demoastrazion. Said proof shall be submitted as an attachment to the Discharge Monitoring Repon (DMR) for the appropriae period. The Division shall determine the adequary of proof. As pan of this det'*~+~*• pion, the Division shall evaluaze whedter the pernrinee could have controlled the discharge in such a manac thaz primary limitations could have been toes. All manual dewazeting of the ponds shall men TSS and total iron limitation. 3. host-Minine Army 4. $alinity Parameters Commencing az the time active mining has reared and surface areas have been remtned to the RqulIed contour and revegetation has begun, applicable discharge may be eligible for limitations other than those specifiexl in Parts I.A.1. These post-mining limitations shall remain is effect until bond relaate. The ptxminee shall notify the Division az the appropriate time so that consideration of permit modifications can be made. In order tc obtain an indication of the quantity of Salinity being ducharged from the site, the petminee shall moniror the wastewater effluent at the following frequeacia: Outtal uen Sample Tvce 002, 004, 005, 006, 008, 009, 011, 012, 013, 014, 015 Qttaneriy Grab Self-monitoring samples taken in wmpliance with the monitoring require specified above shall be taken az those locations listed in Part I.B.1. Total Dissolved Solids shall be sampled on a quaneriy basis. The perminee is required to submi[ a report addressing salt removal in accordance with the Resulations For Imolemmtation of the Colorado River Salinity Standards Throu¢h the NPDHS Perini[ Pro¢tatn, 3.10.0 (see Pan [.A.S.). 5. Compliance Schedule -Salinity Report The pertninee shall submit to the Division by December 1. 1995, a repon addressing the economic feasibility of achieving no salt in all discharges or. if that is not feasible. m+nimis+ng the sal[ iII all discharge from [his facility. The report shall address these two points: 'Ihe cost of modifying all existing treatment facilities to provide for no salt discharge; The cost of salt minimization from all treatment facilities (to achieve combined discharge equal to or less thaw one con of Total Dissolved Solids per day). • fart I.C. for Definitions. Amendment No. 2 Issued FEB ~ 9 i997Effective APR (t } 7~)