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..:.:, , , <br />001.02-lUO UFP:lRT;ttfNt'OF HEd77/. ri'nrrr Qunliry•Cnrcrrol Onrdnrc - ~ ~ -~ <br />RnriorrNe- Page !n, Pernd) Nu. COAOJJriaB <br />1.5 used to dcternrinc the ass(rnilaNtr capacity irr Cripple Creek is dimirlislred between SIG 1.5 arty! Cripple Creek, lcack t/re <br />Dh•is(orr toJind that, tv(tlr the erceptiort ofnrerelrry, there is xu reresaraGle potential fur the Otitfall001A to cmrse or corurihute <br />to rat era•erlancr of a water qualit}• standard in Cripple Creek. Lf order to nssxre that dre inrproyenrert! irr water grurlih• <br />hetyeen AG 1.5 and AG 2.0 corrlirtues to protect the slandardt ix Cripple Creek, quarterly monitorbtg will he required ftn• <br />dissolved ;inC. This rnetal will fie used ns indicator parameter since it lras a mayimum value that is closest to the arsiurilraive <br />capacity of Cripple Creek. blorrthly uronitorirtg will be required fur nrerctir}`to assess whether there are carcentrations qJ' <br />urercun present at dG LO thai could caucc or contrihrrte to an G~ceedance ofdre water qualiy standard jar Cripple Creeh. <br />it Aluntirgan. Afmgu:ese. Zinc, urtJnl/ <br />In 1998. CCc&V regrresterl siteapecifrc water qurtlity sntnrlartlc Ji~r Aregrra Gnlch based on a UAa. The GG'ater Quulin <br />Control Crnnnr(ssion rulopted xater qurrlih• slmrdnrds• fir rrhuniutun (recalculntimr prrx•rdurej, manganrsr (amhierrr /6'Q.SI. <br />urfd:inc (ambient fVQSl based au t/re UrtA. In 1001. baser! on a suhsegfrent Urtq, the Confndssian adopted a Tenrprrrart• <br />:Lfudiftctrtion of the vnndard firr pl/ of 5.6 s. u. and a firurt p)! stamlar<l of ti.0 s. rr »•itlt the irrtentiur~ ajrc•victrirrg shut <br />proposer! pK standard alter additional data are coRec•ted. hr July o% 100?, N:e Corxnrission set a rc'<•ised sift-spec•ilic <br />chronic u•nter grrnlin'.ttnndard Jirr:brc of 6(/Ollg/1 based on the 3S" percesli/r of n f re ;pear record of"data arty! reris~ •rt rlrc <br />nurnganese sunnlard lmserl nn dre recalcu(nuon procc•dun•. <br />Prrrsuarrt ro 5 C'CR 1(101-(L8(?/(bj(iv), perrlrir limhat(orrs are ro he u~ritien hr a nrannertlml re.~prete the nrerluxls br trhiclr <br />thex•atcrcpru!(t•snrndarrlstyererleriverl. Thc•rtrrrerrtchrou(c+vutcrgrralin•standcrrdformimgrtrresettirdainefor~trr'gyro <br />Gtdch• as well rat lire chronic stamlurr(/irr_ixc adopter! he the Conrrxissiorr nt thc•irJuly 1(IO' heru•ing. arc hated on tirt' K~' <br />percentile n/'dutn that u•ere•presented at rlre 1998 and 1(!p?hearings, respec•tivelp. As noted b! 5 CCN 1001-61.8(11(h1(ivi. <br />"the cyicterice uJxztterqunlitp.crarrrlards. purticrrlrrrly where tensed nrr anrhient stream data, c/nes not necestarilcprnhihir rrr <br />all tunes d(schurgc~s that mu}'.rCSrrlt iu poUurinn ofthe iecreivirfg warcr:+~ iu P.CCess oftlee appli<•ahle waterqurtlitpstrurdrrr'rl.+. " <br />rNnre speci/irallp. trlreri the penrrit linritdtiorrJar a ruetnl parameter equals the rater tpral(ry• starulurit hrcntrve the permit <br />app/ire to ul! nfdreflax• in dte stream; its it does in the case ofAr•erpur Gulch. one mm~ expect the water qualit}• sunrdarrl, to <br />he exceeded bt• I S percrnt of the rtutrr. ifthe.rurtistics orr n fr(c•I+the stunrlrtrrls are brrscd c•ontintre ru be representatit•e. Thc• <br />£lirision bus nmrtrccd the latest frre ycdrs o/'rlrrttt fr)r=iuc ut Outfirlt OOIA mad the SS`,' percentile gl•lhat rlnta i.r 590 u~;.~l <br />uiric•h is 98.3%, gJ•du• b00 p g 7 water quality standard. T hereJirre. drere is a reusrinahle potentird thrit the disc/mtge./i'ont du• <br />Sediuu•rnar(orr Pond trill euus'e or ronlrihtit<• to rut excredreu•r of this' n•nrer giratiry standard mrJ a limit of G00 ugll will br <br />set m dre permit: "1•hc' limit, with rerpec•t to the ntethrxl hp tylr(c•!r dre outer gtrality.ctcradarrl ti•as der•ivedJhr udoprirnr hr tlrc <br />Calrrxf ir5rnrt• 1t'ilI fie' .tie! IIOSC'Cl Gft a ••nxl4'atg 8Y,` perC'c7rtde " offiye yews q(dutu including the nrondr firr tt•hfc/r rcglordn~> it <br />required. <br />Sirndarltt three i.c no reusonahlepotentia/Jbr the discharge to catcre or corurihure to art exceedmfee ofdre cun•ent acute or <br />chronic' water quality standard.+ fir nrcurgrrrrese Gascd ou the mrrgnitrrde of the nricrimunr reported all-drip ctve•rrrgr turd <br />reported daily nutrimum values being signiJicmuly less than the irlentiJierl rrssinrilatt•e capacities. These same rlatu slrnu• <br />(/rat there is reasaxthle potential fw• the disc•Irarge to cause or contribute to rut eiceerluuce of the chronlc nurrrgrrnc:vc <br />standard; arut, in rec'ngnitia» ojnretJrndolna ~ uftlre rccalculatiort procedure used to cnIculure thestrnrdard furnrrrngrrmae. <br />a 3(I-day average limit equivalent to the ti•ater grralit}• standard w(1l he set (rr the permit., <br />Dise'harge da{a jar iissolved alwirinum hair exceedcrl t/re acute x•rrter qunliro stiuxtarr! o(1L000 µg/1 axd drere is <br />rcaunrali/e ~rrrttmiat frir t/re d(uhn ae to cause or cnarrilrute to art eyceedurtce of the standard. ~t daily nfttrinauu liurir, <br />egrriyrrlerit to the acute wdtci• qunliry standard, ti•(1J he set br the pc>rruit 'ix'recoguition of the nrethridalrian• of the <br />rcculculatirin procedure used m calcuhue tlrr .uuurlarclc for a/unfirrunr. <br />Finally, there is alto reasmxrhlr potential for the disclurrge to cmrse or contribute !v mt esceed~utcr of the ntininrum 1rN <br />stnndnrrl rrs refxfrred data hove been rat fire level ofthc .wandnrrl. 5irrce the suvulrrrl e,•as bated at the rrrbiimum vahrc• in the <br />three ~•eurdaur setpresenter! to t/re Corumissiar. n doily' nrininnun limit nf5.6 s. er. will be set irr rhepermit. hlonitor(ugJbr <br />these pardnreters wiU be maintained rrt a once pry x•eekjrerpmrrn• uruil consistent compliance at a!c•pel reasarrtbly helott• <br />the !bait is denumstnrted at trkic'h time CC&V emr request ater%rrcerl mnaitoring firque»c}•. <br />ii) Otlrer ,Llrarls nrrd loot rmric Partrmetcrs <br />Past nfmfitorbrg data preseutcd in Tiihle V-I irrrlic•rrte theta the recpeerire assimilative enpac•ities jot mm~mnia, copper. and <br />ct•anide !tore' been erc•eeded curd the assimi/arive rnpnc•ity jot cadmium ha.r beery apprccrherl (G.0 pg!/ tom. (.2 pgil/, <br />EJJluent lnrritx based on a finding ojreusnnabla poteutiu! tri/! be included (rr the penrrit irr tltuse parameters. etlunboring <br />jar these' puranreters trill also he maintained ut a once per x•eek frequency turril corrsitterrtc•wupliartcc m alevel rcrtrnrnddr <br />below dre lindt is deiuunsu-uted at u•hiclr time CC&V emr request tr redtered nrorritaring fregtuncy. <br />