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COLORADO DEPARTMENT OF PUBLI(.~ HEALTH AND ENVIRONMENT, Wnter Qunury Corurol Divi.rinn <br />Ruriunnle - Page 9, Permit No. CO-0038776 <br />2. Cnlculntiorr o(Wnter Ounlirv Bused Effluent Limirntion.r <br />A mass 6nlnnce eguntion wns used ro determine the efj7uent concentrntiores that would not violme the nllawnble <br />in-slremn concentrmions defined by the wnrer qunlity strvrdnrdr (except in the cnse of pH, where the limNntion.c nrr• <br />set directly from snrnm smndnrds or effluent regulntians wuhout using n moss bnlmrce nppronchJ. The nrnsc <br />bnlnnce equmion i.c: <br />Mz - M3g~ - MtQr <br />Q1 <br />lNlrere: <br />Qr = Upstrenor [ow flmr (l E3 or 30E3) from Pnrt /ll.B.2 <br />Qr = ,9vernge daily efjluenr flow (design cnpncirv) <br />Q~ = Combined dowrrsrrenm flow (Qr + QJ <br />Mr = Upstrenm bnckgrmrnd pollumnr concerurmion from lll. B. / <br />Mj = Unknown; Mnrimum nllownble effluent~pollumnt concentrmion cnlculnted using macs hnlnnce erprrrrinn <br />MJ Mruinnmr dmencnrnm nllownhle pn[lumnt enncennntion (cotton stnnrlnrdJ <br />Bernu.re rJthe nmthenmricnl relmiauhip between Jlow, pollurnnr coucentraion and pollurnnr urn.cc, concennruiun <br />limirutinnc cnlculnted using this merhorl implicitly limit instrenm polhunnt mass ro the nrarinunu allanvblr• level. <br />Alco, only Jlow nnrl coucentrntion [imitntions need to be specified in the p~rmh. Mnsc limitntione~ nrr mn required. <br />A .vunmrmy of dre nm.as bnlnnce caladnrion.c (ijm{vJ is shown and discussed iir VLA.3. <br />3. Di.ccu.csiorr of Efflueru Limitntion.r <br />nJ Reeulntian.c (m- Efjluenr Limirnrion.c: the Regulnrions fur Efjlueru Limitations (10.1.0), npp[v re the <br />rom•entionnl palhunrus. Far this jnciliry the Gnurnriorrs jot Oil and Grease ore bnserl on thi.v regulmiun. <br />h) Snlicnhle Federal Eflluenr Guidelines nnrl Srnndm-dc: Tlie ferlernl guirlelings which apply to rhi.c type rffhcilit~ <br />tar fount! under 40 CFR 434, rider! £fllrrent Guirlelinec (or Conl A4inine. Thq limitntinn.c n•hich apply me' <br />Table Vl-S -- Ferlernl Slnnrlnrds (40 CFR 434) <br />Parmneler <br />Limi/alions <br />30 Day Avg Daily Mn.x <br />pH, .r. u. (minimum - marinnrmJ ---6.0 - 9.0--- <br />Tornl Suspenrlerl Salirlc, mg/P* 35 70 <br />Tom!/ran, m,g/f* 3.5 7.0 <br />Serrlenhle Snlirlc. mf/f* N'A 0.5 <br />• Drrsr pnrnrnnen' arc subjen l0 8urdrn of Prnnf Regnir ernente~, see nn'r seaian <br />.glrcrnrue Lindtnrinn Burden of Proof Remrirernenr.c: br cm jormnnce wide 40 CFR 434.63, the perrnirree hu.v the <br />burden of pr-aof when .ceekinq reliejfi-nnr torn! su.cpenrlerl .colir/s (TSSJ, tarn! iron tort!/or seulenhle .+'u/irla (SSJ <br />limirnrimrs. Dischm;gcc from aurjnlls 007, 011 turd 012 ore uor eligible jot this exemption. Oulfidlr 002 and <br />004 ore eligible for reliejfi'am TSS, rcnn/ iron nnrl SS; hmve+•er, dve mnjoriry of the [ondbrg fi»m amp rlischnrge <br />has ra conrie7 rjstnrm rwrafffm~ the relief to he nrnilable. The pernrirtee will need ro .draw tluu erreedence u( <br />the npplicnb(e limirmiun.c „n.c enuserl In' precipirminrr nud not mice wnrer, through n rarnpnri.cnn n/'dve laruling <br />firnn e« ch .vource. 77ve remaining permitted aurjall.c (005, 006, 008 and 009J ore eligible for relief fivnn TSS, 7~. <br />!ran nor/ SS nt all rinrrcc since only .curfnce runnjj (rnn• wnrer jot ourfn!! 006) rli.rrhnrgec mr nurhor'i; ed fi~urn <br />these uurfrd(.c. <br />