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COLORADO DEPARTMENT OF PUBLr~ HEALTH AND ENVIRONMENT, Wnrer Qun,,.y Conoo! Dirisiorr
<br />Rnnnnnle - Pn Ge l2, Pernit No. CO-0038776
<br />The /WC fin' the rnurbined flow from nurfnlGr 002 nnrl 004 is 0.6'90, which repreventc n wnsrewmer
<br />Corr cenrrarion rj0.6% effluent ro 99.4% r-ecei vin,g srremn. The lwCjor ourfnlls 0!! nrrd 0!2 is /OOr9o,
<br />which reprerenrs n N~nsrewmer concenrr-nriou of 100% effluent to 0+7 receiving .nrennr.
<br />However, hr ndrlirion ro the /WC value for determining whedver chronic or ncwe WET resting requirements
<br />are npplicnble, the clnssifrcntion ojrhe receiving stream rmusr be considered. According to the Colorado
<br />Wnrer Ounlity Control Division Biomonitm'inp Guidance Documeru, doted July I, 1993, +rhere Nre rerei rin,r;
<br />wares is classified nqunric life, class 2 without all of the appropriate nqunric life numeric stnrrdmrl.r, nerve
<br />WET recring is required, regardless ojdihuion. Since the receivhrg wmer jot outfall O/1, Syh~esrer Cu(ch,
<br />i.r cln.csifierl a.c Cln.cs 2 Aqunric LJe use, bur does nor here rrl[ of die appropriate nqunric life numeric
<br />srnnr/nrr/c, the Division has determined thm ncure W£T resting is npplicnble for rhi.c ourfnll (nl.cn .cee
<br />following pnrngrnphJ.
<br />3J Acute WET Limiralion.c: Because of rleuronsnnted rosiciry iu several permirrees' cool mine rbninage, dre
<br />Division believes There is ren.cmmble paeruinl for the discharge to iurerfere +rirh nrrninmenr of applicable
<br />venter qunliry clnssifrrnriwrs or srmrdnrds. Because oJr/ris courlition, the ncure roriciry limit lms berar
<br />incorporated into the permit nnrl becomes effective jar ouljnlls 002, 004 nrrd 0/l inunedintely. Tlve
<br />permirree i.c required ro conduct routine monitoring, the results of which are to he reported sec nn LCyrr. if
<br />the LCy~ < 70090 efJlueru, the perrninee i.c rerprirerl ro cmrrhrcl the mumm~tic mnrplinnce schedule a.c
<br />irleruified in Pnrr 1. B. ojrhe permit.
<br />The Divi.cinrr rorr.cider.c rlte aquatic life c(n.ccificnriou nail uses ojrhe receiving nvuer in rlerer-rninin,G whether
<br />nerve ur clurmic WET r-equirenrenr.c m~e bnpn.cerl. Becnu.ce the receiving ,rarer jar auljnl! 01 / i.c clu.c.ci/i erl
<br />aquntir I fe cln.vs 2 widr nu nppruprime nqunric life moneric .crnndm'rlc, ncure requirenrenra apply ro dri.r
<br />rli.cchnrge in.crend of chronic requirenrener. Because of demon.wrnterl roziciN in .cevernl perminee.c' cool mine
<br />rlrninn,ge, the Division believes drere i.c reacorrnble pnrentin7 jar dre di.rchm'ge m imerfere u•irh nrruinnreru of
<br />npplicnble ,rarer quality cln.cs fcminn.c nr srnerlmrlr. On dri.c hnsi.r, n.c required under section 6.9.2(5) of
<br />the Rerulnrinn.c fa' the Srnre Di.cclmree Penuir Syvem, the Division finds there is rensonnb(e pnrentirrl frn~
<br />the rlischnrge from ourjnl( 011 ro iruerfere rrirh nnninnrenr of npplicnble wmer rprrrliry dascificnliun.c nr
<br />.cmndnrrl.c. Because ojrhi.c condition, the ncure limitation hn.c beers inenr~~ornrerl iota the pernrir. The
<br />permirree i.c required ro cnnrlnct routine monitoring, the recu[ts of which are ro be repnrrerl ns nn LCyrr. 1/'
<br />the LCyrr <_ 10090 efjhrenr, the permirree i.c required ro cunrlucr the nuronmtic canplinnre .ccherlule rr.c
<br />idenlifierl ur Pnrr I.B. of the permit. The revdrs ojrhe resting are ro he reported on Dirisimr npprurerl
<br />farm.,.
<br />4J Chronic WET Linrirminae Because oJdenmrecrrnred rosicity in .cetera/ permirn•e.c' ran! mine rlrninnge, the
<br />Diri.ciun helierec there is ren.connhle poreurinl for the di.cchnrge ro inretfere with mrninnrent rf npplicnble
<br />Wnrer qualin~ cla.ccificnrions nr .emudm'rl.r. Bemuse of dri.c condition, the ehrouic roricin~ limit hoc berm
<br />incorporated into the permit nrrd hemnres effective far mrljn/! 0/2 immerlinrelp. The permirree i.c requires/ ro
<br />conduct routine monitoring. The results ojrhe tegiug ore ro be reporter/ nn Divi.cinn npprnred fiurn.c. "!'hr•
<br />permirree trill he required to runrlurt «.crnti.cticnl derirnrinn on die r/rarer, lnokingfbr nm~.crrrrisricnlh~
<br />,rignificnnr difference in nzricity henveen dre romrol hurl the eff7neur caurennntione'. Tlri.c .eer of errlrulutiuns
<br />rri ll lank nr doe fill range of to.ririn~ (lethality, ,growth and reprnducrimrJ. Ijn level of ehraric to.ricirr
<br />uccucc, such that r/rere i.c a srmi.rricn//~• significant difference in the lethnlin~ (nr the 9590 carfrlence /ere1J
<br />henveen the control mrd any ejfluem concenn-orinn less rhmr nr equal rodre /nsn~enrrr Wnsre Concerurruiun
<br />(lWCJ, the permurcre will be rerprirerl ru fallow dre mrrornnric conrplinnce sclrerlule identifier/ in Purr l.B of
<br />the permit, if the uhaerred ruriciry i.c rkre to nrgani.cm ledmlirv. Only erceer/nnce of the limimrinn s'peci/icrl
<br />in Pnrr 1. A. /. (eJ ,rill n'ig,ger the rrquirenrenr jar couduning the nuronmtic cnnrplimrce schedule irlenri%rr•d iu
<br />Pun 1. e. rj doe permit. if the toriciry i.r slue ro rl~ereneec in the growth of rhr• forbear/ mimm~ec ur dre
<br />r-epruduction ojrhe Ceriodnphnin, no imnrerlinre nedmr nn the pan of dre permirree .gill be rerprired.
<br />Hnrvever, this incident, along u•irh oilier WET rlnrn, n•il( he evrrlunred by the Divi.cinn unrl mar firrw the
<br />bnsi.r jar reopening the permit nail including nr/rlirionnl WET lirnirs or under requirenrrnr.c.
<br />5J Gerrernl hdnrmminn: The permirree .chrndd rend the WET recrirrg .cectinus of Pm'r 1. A. nail I. B. of the
<br />permit cnr-efully. The permit mulinea the rest requiremenr.c nnrl the required jo[Imr-up nerinn.c rhr• permiuee
<br />nuert mke ru resvdve n turicin~ incident.
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