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COLORADO DEPARTMENT OF HEALTH, Water Qun[iry Control Division
<br />Rmionnle -Page 11, Permit No. CO-0032638
<br />A4elnls: For metnLs with dissolved srmrdards, correspondiug effluent limitntiotrs nre bared upon the poreminlly
<br />dissoA•ed medrod ojnnalysis. For standards bared upon the torn! recoverable medrod ojmralrsis, dre limits nre
<br />based upon the same method ru the srmrdnrd.
<br />A comparison ojthe limitariatu contained in Table V/-5 and the effluent concentrations reported in dre permit
<br />renewal application for outfalLr 006 indicated that the discharge exceeded the newly calculated venter qunli/y-
<br />based e-Qluent limirariotujor torn! recoverable mercury, total recoverable mrd potentially dissolved mm~gnnese,
<br />and su fare. Tirerejore, venter qunliry-based ejJluent limiratiau jot These parameters will 6e incorparnted into
<br />the pen»it, along wirlr a compliance schedule to allow the pernrittee to take action to be able to meet r/iese
<br />lirnitatimu. Le addition, venter qunliry-based e.(Jluent limitations jot fora! recoverable iron apply to outfidls 002,
<br />003, 004 and 006. Based on a comparison ojthe [imirntioru artd the reported e,(Jluenr concentrations, tm
<br />problems in complying with the iron e,~luent limitations are expected for these oulfnlls. Seasonal limitations
<br />hove been calculated for iron. !t should be noted that the federal BAT limimtimts for torn! iron are more
<br />resrriclive that the WQS bared limitatimu during Augtrsr thraugk February. Tlms, total iron limitations apply
<br />during August -February artd 1om1 rerovern6le iron limitations apply during March -July.
<br />dJ An/ideerndmion: Pursuant m sediotr 3.1.8(IJ(6J of The Bn.ric Slnndardc and Merhadoloeies (~r Sur(nce Rater,
<br />nn antidegrndntion revie,v is not required for this permit renewal because it does oat result br mt increased
<br />!Dorf.
<br />eJ Snlinirv Regulnrian.r: In rompliarce with the "Regulntioru for lmplentenmlion oJthe Colorado Snlinih' StnndmrLr
<br />77nough the NPDES Pernrir Program", n!! permirtees are limited to one ton per day or 350 tans per year of
<br />TDS. As sha,vn in Tables V-2 and V-3, dtis facility's dischm'ges are in excess of these limits. 77re penniuee
<br />must submit n repot ,rhich documents srherher it is feasible ro treat to these levels. 71re regulmimrs allow for
<br />the n•niver of any lintitmimrs upon subminal ojn report. Quarterly uroniroring fm' ram! dirsolverl solir/s will
<br />continue. The eanrplinnce schedule regnrdhtg salinity requirements is inchrded in Pnrt 1. A. S. of the permit.
<br />f) R9xrle EfRuenr Toricirv (li'ET/ Teaing.• For Ovis facility, cln'mtic IVET testing is required nt oulfnlls 002, 003,
<br />004 and 006 (See Parrs I.A n»d I.B of the permit.)
<br />l J Purnnse o/' lL'ET Te.ctine: The YVnrer Quality Control Division has esmblished the use of IVET resting ns a
<br />method for identifying and controlling toxic discharges from wnsrewatcr n'ennnent jnci(ities. IVET letting is
<br />being utilized ns a menus to ensure that there are no discharges ojpol/umnrs "in anrounr.r, carcemra/ions
<br />ar combinn/ions ,+•hich are hnrnfrl to the beneficial uses or tonic to humatrc, nninurls, plmus, or nqunrir
<br />7rfe" ns required by Sertion 3.1.11 (IJ rjrhe Basic Srmrrlm~dc our! Merhndnlaeies (nr Sur(nce R'arerc.
<br />2J /n.crrenm Lt'nge Cnrrrrntrmiar (IWC): lNlrere moniruring or limirarionsfor WET nre rlecnred npproprinre by
<br />the Diri.cimr, chronic iustrenm dihuiou n.c reprecenrerl by the chronic /WC i.r critical in rlercrmuring Irherher
<br />orate or clu~nnic conditions shall npp(y. For those di.rchmgec ,There the chronic /lVC i.r greater than (>J
<br />9. / o, chronic conditions apply, ,There the Ill'C is less dlmr or egrrn[ to (_<J 9.1 «cure conditiun.r npplr.
<br />71u• chronic Ill'C is determiner! using dre following equation:
<br />75VC = JFnciliry Flow (FF)/(Stream Chralic Low Flow (mama!) + FF)J X 100%
<br />lire flows and correcpmrding /LVC for the npproprinre discharge point nre.•
<br />Disdmrge Points Clvonir Lon' Flow, Facility Design F(o rv, /lY'C, (°,'o)
<br />30E3, (cjs) (combined) (ejs) Aug-Feb Alar-July
<br />002, 00-7. OOJ, 006 6 1.3* S.7 13 59
<br />' Aiis is Jrr mLV( tf orrrf"rtlLs (V'3 and 006 onlp bermue mrlfias (X)? and P)4 hnce reported no disdmr'ye durin,r Jlis period.
<br />The /lVC fur rhi.c permit i.c /69o and 59`7 (Aug -Feb and dint -July, rccpectivelyJ, ^'hielr represents n
<br />,rrr.crennrer concerurnrion of /S9c and 59 o rf/Iuent, respecri Tel}~, ro S1 VO nud 4l °, recpectilrle, reccirin S'
<br />snz'anl. Berk IWCs m~e Bremer rhm 9.1 mc, therefore, c/n~unic requirements uppl ~.
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