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_..,... <br />COt.ORdUO UPPAR'1'.M1IFh FOF'f/E.tTfL I{"rarer Qnalrh~Conrrof Division <br />Rntionnle - Prrye S. Pernrir Nn. CO.OOJJdJN <br />The Division trill rear irtclu[le Outfall OOSA irr this renewal permit based orr dre uirl<irowrz rrahve of the qunliry oftlre rlischmge <br />once the VLFliners are pierced: revised water quality standards forArequa Gulch mrd Cripple Creek drat niay be rrdnpted in <br />theJiuure by the Cammissiorr; and other regrrlauiry requirements that mrrp be adopted in the fiance. <br />111. WATER QUALITYASSESSMENT <br />The TYater QualiA~ Cnrttml Divlsiar s Asscrsrnen! Uuit has performed an assessment ofthe stremn standards, lowflox• data. rant! <br />mrrhient snemn data mrd determined die assimilative cnpac•uies oJAreyua Grrlc•!r acrd Cripple Creekfor the pallutturts gjcnnccnt. <br />This infornratinn is in Apperrrlix A to this rationale. The Diriciun's PerurlLS Uirit hrts revicx•rd the assimilative eapacities mu( <br />rleterrniaed the appropriate x•uter• qunlity huced permit lnniuuions. u•hlc/r can he found iv Tithles Y!- 1 mrd Y[-2 of the rationale. <br />IV. FACILITYDESCRIPTION <br />A. Indushy Description <br />1. Ttlre• njGtducin• - Thi.~ firciliq' is [ur upcrr pil-c vanide heap leueh go/d nrirring operation. The pruleN c•nn.cists of the <br />Cressmullinea'cas. the {''LF, rite ~tdsorptiorL Desorption. end Recm•cr,r Facilin•, the cr[aLcr, OS.4s. [tmi tirrcillun' ur~.rs. <br />Reclanuuiau of the mine site irtelrider hackfilltag [ J'soirre nrured areas, demxlJic•crtiorr aj'tirc ore in dre VLF, hreac•lring the <br />{'LF liner, curunuiing, and rcn•egetruian nfdicurrhed areas. <br />?. Parentis! Smrrces of Pollutarrtc -The potential spruces [ f the pnlhaarus that pray be dischmged rrt OutJal! U(1!• { arc• <br />cvnnide cnrrrpnuudc aad nretaLc irr rite water rhst flrnrs to the sedimcrncrtiorr pond. <br />3. C'hearicrr/s U.ced -Other than t/re potential pglfururrtc discrrsscr/ rrboir, ao other chemicals tr•)rirh irurv he .tvorcd ur the <br />nihle .GlC [rrB 17keh' to I)e pr'C3errt in gimritities ar used to a narrater which x»uld pose a risk ofheing discharged to n•utrrs <br />gjtlre Srnte. This tc, descriherlJirrther to CC& V's F.mergeuct• ResPnrrse Plan. <br />$, {i'rasretruter• Ti•euuneru Description . <br />!'hrrrcanneutJhc•ilih•jurOutfirll00lAconsictsofastdimentutloupnnd. Currentlt•,tivolxmdsfin•rrpassisrlinrertunr•srsrern <br />are operated us orr "expcrirnerual" tracer gnslin' ruarutgenreru practice'. These ore !neared irnrnedkrtely upsereuru gl'du• <br />srrlinrerrtutiun pnnrl (See F'igrrrc 4). ~ _ <br />Fur Ontfirl1l10,iB, ifa dischrtrgc' were to occ•rrr, the nroctlikelt• apprurrch would im•vlre the controlled release oJJlotcs front thc• <br />Ertrrnal Storage Puad ("ESP) to Arequrr Gulch. The F.•SP has a arppc•ity of 20 rnillinrr gal/nrrs and h ayatenr fi,r rrducnrg <br />weak acid dirsoeirrbk' crarride ("C'N„•,r,") earccrrtrations. TrrrncJcr of water Jrnnt the F,SP rn rlrequa Citdeh cordd be <br />ac•cornplislred using a purnphack pipeline. T/re sump for.the punrphack truul[Ibe used to rlirrct Jluws front Ihrr piprhnc• into <br />Arcquu Gulch at Outfrdl OOSB, as shotru irr Figures 4. 5, mtr16 ol•tlte Permit. Orrlt• mirror ehartges (e.g., remotxr! of c heck <br />vuh•es, discorarec'tinn nfpunrps) to rite punepbcre•k system x•mrkl be reyuired to acemrrnrrx(irtr flows front the ESP. <br />Arr alternative x•vuld hn•nh•e Igving a tenrjroru7• pipeline front the YLFuver the Phlrsc //!ne hcrnt to Aregtru Gulch. Doc to <br />elrvatinn clrintgefronr rite crest to the base oftlre toe hcnn. siphoning rardgrrn•ityfloti~ x•airl[I he possihle. Exis[ing ripr«p, <br />geuti~xtilc, ur liner material alrearle irr the area svnrild he used atone or in combination to dissiprrtr: errerg!t• at the nrulet uJ'the <br />pipe. <br />blonituriug srsteutc tridthl dre I'LF n•otr/d sl/ou• aritple time tci irnp/enrerrt either ojtlrese n(tenrathas. Flows tender t-ither <br />alternative xnuld he monitored at Outfcrlt q(IS$, tv/rich is helutr Ourfa110t)1,4. <br />PERFOR,4IAT'CE F/ISTORY <br />A. Sforti[uriug Data <br />1. Discharge ,'{forritoring Reparn•: Tirhle V-l .ctmrnurrces the e(J1::eru data reported orr !!re Discharge alotritnrirrg Retraces <br />(D,t/R'sj suhmtned by die CCd i'from January )997, thrurrgh December 2001. Otrtjall tTOIA xns dre only urufirll with <br />reprirtal le tlisclrarg¢s rhtrirrg this• period. <br />