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COLORADO DEPARTMENT OF Ntr4LTH, Water Quality Control Division Rationale -Page 8. Permit No. CO-0038024 Table VI-S - Federal y AvA:: neenttnhoit DiarTv: Mos. Concenttmton' pH, s. u. (tninirmttn - maxinwtn) -~ 0 - 9.0- Toro/ Suspended Solids, mg/[' 35 70 Total Iron, mg/1* BAT*' 3. S 7.0 NSPS'** 3.0 6.0 Senleable Solids, ml/P* N/A 0.5 • fine purmntrm sv6lea b &udea gJHa~Readdra~atr, ees .m reaW~ •• Bar Awila(rle TeduWap~ - uppNa m Ame pads tauCVard prior ro 32987 ~DO1, (Xrt and 0.'131 ••• Ntw Savo Perforaa,ne Ss '-^r• - apptfu b tlse pads aeua+urd $le 3298! 1~. 005, 007, Q78, a79, 025 and OtBJ AUernare Limitation Burclen of Proof Reaulretnenu: In rnnfotmance wttlt 40 CFR 434.63, the permittee has the burden of proof when seeking relief from total suspended solids (ISSJ, total 'von and/or settleable solids (SSJ limitations. Only surface runoff outfalls are eligible for relief (subject to these burden of proof requiremenu). Relief may be granted jot each discharge occusrence only w5en necessary and shall trot be granted when the permittee has coturol over the discharge The panittee should endeavor to meet the prinraty limitations whenever possible. ?he pernittee will need ro show that exceedence of the applicable Imitations was caused by precipitation and no other source and that the discharge was beyond their control. aJ For rainfall, to xnive TSS and total iron limitations, it is necessary to prove that discharge occurred within 48 hours after measurable precipitation has stopped. /n addition, to waive satleable solids limitations, it is necessary to prove that discharge occurred within 48 hours after precipitation greater than the 10.ytar, 24-hour event has stopped. b) For snowmelt. to waive TSS and total iron !t»ritations, it is necessary ro prove that discharge occurred within 48 hours after pond inflow has stopped. In addition, to waive senleable solids limitations, it is necessary to prove that discharge occurred within 48 hours after pond inflow volume greater than the 10.year, 24-hour event has stopped. Should a precipitation event or snowmen occur, the pertnittee shall submit adequate proof in order for an exemption to be claimed. Said proof shall be submitted as an attachment to the Discharge Monitoring Repon (DMR) for the appropriate period The Division shall duertnine the adequary of proof. As part of this determination, the Division shall evaluate whether the petminee could have controlled the dscharge in such a manner that primary limitations could have been tnet. All manual dewatering of the ponds shall meu TSS and total iron limitations. c) Antideeradation: Since the receiving venters are use protected, they are exempted from anttdegradation regulations in 3.1.8(3) of 71re Basic Standards and Muhodoloeies for Surface Water. d) Salinirv Data! Dissolved Solids): Jn compliance with the Reeulationsfor Implementation of the Colorado River Salinirv Standards Throueh the NPDES Permit Proeram, the pmnittee has monitored jot total dissolved solids on a quarterly basis. Based on the combined TDS sampling data for outfalis OOI and 024 shown in Tables V-2 and V-3 and estimations of the TDS contribution from the other outfalis, this entity's total discharge does not meet the regulatory limitation of a maximum ojone ton per day (or 350 tons per year). The perminee submined a salinity report dated March 7, 1988. After review of this report, the Division concluded that no TDS limitations would be required. However, quarterly monitoring for rota( dissolved solids shall continue.