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COLOR.IDO DEP. IRT,b1Er\''T OF 1'I;BLIC HE:ILTFI t; rD ENl'IROr\r:L1F_ ~T. LVurer Qtathry Cun;rv( Ur. ^hut <br />Ranumd~ ;Imeru(ntcnt No I Pugs n, Penntt rVu CO-0000'2/ . <br />?) For mawrneft rn wmi~e TSS and solo[ iron limimtiurts. rt is necessary m denwnstrrur that discharge <br />• occurred ~~•ithut 4.4 lrotvs after pond inflow has stopped To rrrrve settleable snhds lec••r:riun,, is <br />necessary to prove that disclrurge occurred wuhin 48 hours after pout inflow rnlume greater than the <br />l0-year, 24-/tmer event has stopped. <br />cl Salinity Re~u(minns. In canpliance with sec!ion 51 8(2)(1)) of dte Grlorndo Di.re'hnrre Pernur .Svsrern <br />Rer;ulntions, die oennittee shrll monitor for marl dissolver! solids on a quarterly basis Smnnles shall be <br />taken at the effluent discharge pours. Safiniry requirements are utcluded m Pan ! 8 1. e. ~f the permit <br />d) R•7tnle Effluent Tortcin lLVETi Testing: /n addirran to naat WET testing for estsring outfalls 00'. 003. 00~. <br />006. 010 and 0! 1. and chronic LVET testutg fir e.rarirtg outfalls 004 urtd 008, anue LVET testing is required <br />for new outfalls 0/2. Ol J. 0l 4, 016, mid 017. See the fallowing discussion for WET resting for there <br />mrtfalls (Also see Part l.,1 4. ojthe permit •/ <br />/) Purpose of VET Testing: The Water QtealiN Control Division has established the use of IVET testing as <br />a method for identifying and controlling tocic discharges from wastewater treatment futilities. LVET <br />testing is being utilized as a means to ensure that there are no discharges ojpolhunnrs "in amounts, <br />concentrations or combinations which are harmful to t/te beneficial uses or toxic to humans, animals. <br />plants, or aquatic life" ns required by Section 31. l/ (I) of the Basic Standards and rLlethodoloeies for <br />Surface Waters. <br />2) lnstream Waste Concentration (fLVCI: Where monitoring or /imitations for WET are deemed <br />appropriate by the Division, chronic inslream dilution as represented by the chronic fWC is critical in <br />determining whether acute or chronic conditions s/rall apply. For those discharges where the chronic <br />IWC is greeter than (>) 9. ! `70, chronic conditions apply, where the ftiVC is less t/tmt or egttnf to (<) 9.1 <br />• acute conditions apply. The chronic /WC is determined using the following equation: <br />/WC = /Facility Flow (FF)/(Stream Chronic Low Flow (annual) + FFJJ Y 100`70 <br />Flows artd !WC cafcttlations for outfalls 012, 013, 014, 016, and 017 ore irrelevant for t/tis <br />detenninnnon because, in addition to the 1WC value for determining whether chronic or acute WET <br />testing requirements are applicable, the classlftcntion of die receiving stream must be considered. <br />According to die Colorado Water Quality Control Division Biomortitorint; Guidance Doaanent dared <br />July 1, 1993, where die receiving water is classified aquatic life, class 2 withou( all oJthe appropriate <br />aquatic life numenc standards, acute WET tes[ing is required, regardless of dilution. Since the <br />receiving waters for otttjalls 012, 01 J, 014, 016, and 017 are classified as Crass 2 Agttntic Lije use, but <br />tivil/tout all ojtlte appropriate agttntic ltje nttnteric standards, the Division has determined sitar acute <br />WET resting is applicable for these otttjalls (also see following paragraph). Since segment l2 is <br />classified this way, t/tese five outfalls are subject to acute WET testing requirements. <br />3) Acute WET Limitations - Ourfnlls 013 013 0I4 016 and 017: The Division has found that discharges <br />of pi! pumpage. spoils spring water and similar sources fran coal mines at similar sites hove exhibited <br />effluent toxtciry. Also, to.ciciry failures /rave previously occurred for some of the discharges at this <br />facility. On this basis, the Division believes there is reasonable potential for the discharges fran <br />outfalls 0I2, 013, 014. 016, and 0!7 m interfere wilt nttainrnertt of apphcu6le water qunhrv <br />classifications or stmtdnrds. Because of this, the acute to.eieiry limit has been utcarpornted into rite <br />permit nnrl becomes effective immediately The pennittee is required ro catduct routine monimrirtg, the <br />results of which ore to be reported as nn LCS~. if die LCsa . 100 e effluent, the pennittee is required to <br />conduc! the uutmnatic compliance schedule us irlenrified i.n Part LA.4 c. of the pennu. <br />• <br />