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I• I.VLVf(/1LVIlCYAI[rMGIYI Vl 11EAI./R, naICr YLLVIIIY VVIIIrVI (IIVY IV /I Rationale-Page S. Permit No. CO-0038024 c) Alt t / imit Yn R ndan of Prn Ragviramantc: [n conformance with 40 CFR 434.63, the permittee has the burden of- proojwhen seeking relieffrom total suspended solids (TSS), total iron, and/or settleable solids (SS) limitations. Only surface runoff outfa[!s are eligible for relief (subject to these burden ofproof requirements). Relief may be granted for each discharge occurrence only when necessary and sha/1 not be granted when the permittee has control over the discharge. The permittee should endeavor to meet [hepHntary limitations wheneverpossiGle. Thepermittee will need to show that exceedence of the applicable limitations were caused by precipitation and no other source and that the discharge was beyond their control. )) Fnr rainfnll 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 setleable 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. 2) Fnr cnnwmah to waive TSS and total iron /imitations, it is necessary to prove that discharge occurred within 48 hours after pond inflow has stopped. Irt addition, to waive settleable 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 snawmelt occur, the permittee shall submit adequate proof in order jar an exemption to 6e claimed. Said proof shall be submitted as an attachment to the Discharge Monitoring Report (OMR) for the appropriate period, The Division shall determine the adequacy of proof. As part of this determination, the Division shall evaluate whether the permittee could have controlled thedischarge in such a manner that primary limitations rnuld have been met. All manual dewatertng of the ponds shall meet TSS and total iron limitations. I • d) P ll.t r lim'md h, Waror n/ity_Smndnrde _ FABL Environmental Regulatory Specialists, Inc. has performed an assessment of potential water quality standards-based assimilative capacities for the Water Quality Control Division and made a preliminary determination of the assimilative capacity ojthe receiving stream for the pollutarsts ojconcern. This assessment can be found in Appendiz A of the rationale. The Permits Unit evaluated the assimilative capacities and has made a determination as to whether there is a reasonable potential for the facility discharge to cause or contribute to an exceedertce of a stream standard. If there rs a reasanabfe potential far the discharge to contrtbute¢o an exeeeden ce, effluent limits are included in the permit. e) Ant;~ta~~rzd?tinn: Since the receiving waters are use protected, they are exempted from antidegradation regulations in Section 31.8(2)(6) of Th R c'r Ct nd de and Mor6ndningioc fns Cyrfare Waror f) In conformance with the f nlnmdn Rivas .Cnlinity ,CMndnrdc and section (i1.8(2J(l) of the t~nlnrndn Dicrhnrgp Pvrtnit ~'yctam R9va .lnti~nc the permittee shall monitor for total dissolved solids or conductivity on a. quarterly basis. Samples shall be taken at effluent discharge points to state waters. Salinity requirements are included in Part LB.1. 'ojthe permit. ~ Whnla FRlnanr Tnrfaity /WFT) Tact;nv For outfalls 004, 014 and 026, acute WET requirements apply. (See Parts LA and LB ojthe permit.) /) Pl~mnco of WFT Tacrinoo.~ The Wafer Quality Control Division has established the use of WET testing as a method for identifying and controlling toxic discharges from wastewater treatment facilities. WET testing is being utilized as a means to ensure that [here are no discharges ojpollutants "in amounts, concentrations or combinations which are harmful to the beneficial uses or toxic to humans, animals, plants, or aquatic life" as required by Section 31,1 ! of the R 'r Stn d rdc d Mnthndnlagioc fns Sutfaro Wntarc. 1) 7nctrcam Wacm fbnrentrat[nn /IWt;--): Where monitoring or limitations for WET are deemed appropriate by the Division, chronic instream dilution as represented by the chronic IWC is critical in determining whether acute or chronic conditions shalt apply. For [hose discharges where the chronic IWC is greater than (>) 9.1%, chronic conditions apply, where the IWC is less than or equal to (~ 9.7 acute conditions apply. The chronic TWC is determined using the following equation. r ~ ~J IWC = (Faeiliry Flow (FF)/(Stream Chronic Low Flow (annual) + FF)J X700% The flows and corresponding IWCfor [he appropriate dischnrge point are: