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COLORADO DEPARTMEM' OF HEALTH, Water Quality Control Division <br />Rnnonnle - Pnge 5, Permit No. CO-0043567 <br />Tnb/e V/-3 -- Ejfluemt Limitations jot Orttjalls 006 - 007 <br />Parameter Limuafion Rationale <br />Flnl+•, MGD Repori ~ Design Capaciq~ <br />TSS, mg/f 35/70 * b/ Federal BAT <br />Torn!lrun, mg/P 3.0/6.0* a/ Federal NSPS <br />Sculcable Solids, mP/P 0.5* c/ Federal BAT <br />Oil trot/ Grease, mg/P /0 c/ State EJjluenr Regulatiars <br />pH, s. rr. 6.5 - 9.0 d/ Water Qunliry Stnridnrds <br />la Aur m rm,pe <br />b Jp.drry m~erage/daily rw<imum <br />_ OnJ,~ Afa~imwn <br />.1 /,/1 ~IIIIIII ,1f411r111111, <br />7br..r ryv miners niay be diglble for norm eaempoan, me Burden of Proof u sttoon V1.A.3.bJ <br />2. Crrlculntion of Water Ounlit•~ Based Effluent Limitations <br />.A arras balance equnuon was used to determine the ejJluenr concentrations that +rould nor +~iolare the <br />allowable irrstremn concentrations defined by the water quality standards (escept in the case of pH, I+la•re rite <br />limitations are set directly from strewn standards or e,Qluent regulations without using n moss 6alnnce <br />approach). 771e mass balance equation ir: <br />M, <br />h1~Ql - MrQr <br />L~• <br />H'here. <br />Q, = Upstream lo,v flaw (l E3 or 30E3) from Part /11.8.2 <br />Q. = Arrrnge Andy effluent flo„• (design cnpnciry) <br />p, Cunil~ined do„rrsrream flow (Qr + Q~ <br />,l/, = Upstrenrn background pollutant concentration from //1. B.1 <br />i!- = Uakno„In," Macimurrl allowable efflueru polhumu carcentrntion calculated using nmss 6n!ance equnnun <br />,11; _ .1fa.rrnuun do,rnsrream n(lnwab(e pol6rtnnt concentrntiar (stream standard) <br />Brcuucr ujthe rnnrhenmricnl relaionship between flow, pollutant concenrrntiai aul polhrrar,r nm.rs, <br />currerurarion limitations cnlcidnred using this method implicitly limit insrrenm polbumrr nmss m the nm.~rnrmn <br />n//ull~nble lerel. .-I/so, ally carcenrrntimr lirnirntions need to be specified in the nennir. <br />Ib/u~. l~mi« umfu nrr nor required. Because the lul+~Jluw is ;.ero, the efjluenr linii!ariuns r.i!! crpml !hr <br />~ruic,urlr (.k]~. <br />Dn~rc,.,~inn ujEffLreru Limitations <br />u. Krerdarinn+" fm~ Effhrent Lunirnrions: 77re Regulnriaer jar Efjluenr Lrmitnrions r10 /.0/, crrp!p ro ~~~. <br />runrrruionnl polbannec. Fur this jnci(in~ nc~ linvmnons jut Oil and Grease are bated or. rhi., r<-ell'Ir:n;r <br />l/) _Innlicable Federn( E/lhrent Guidelines mul Suurr/nrd.c: 77re ferlernl guidelines +vhich rrpn!:~ ru drip r.pe /j <br />il~iliry ore found raider +0 CFR a3~?, rirlerl Effluent Guirlelmes Fa' Conl A•linin~ Frrcibr e<. 71rr l.`r~:r;nnnrr.c <br />~~. !uch apnlr are <br />