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COLORADO DEPARTMENT OF HEALTH, Wurer Quality Control Division <br />Rationale - Pnge l5. Permit No. CO-0039192 <br />The /WC jor these combined outjnlLr is I l.5%, which represents n +yn.ctewnrer concentration of l l.5% effluent <br />to 88. S..°o recci ving strcrun. <br />3) Chronic WET Limitnliun.c: Because oj!{te potential jor to.ricity n+ Ihece di.cchvges, a.c demonstrated by the <br />eri.t'ter+ce nfinelnlc irr the diccltnrgec, a.e xell ac {i'ET monimrnrg recu/ec nt other coal nrirtirrg j<tciliriec, the <br />Division believes there is rea.connble potenlinljor the di.cchurge to interfere with attainment ojnpplicuble venter <br />quality claccificntion.c or smndurdc. Because ojrhis condition, tl+e chronic limitation hna been incorporated <br />in[o the permit and became.c effective April 1, 199i. Prior Io the chronic limitation becoming effective, the <br />permittee is required to conduct routine monitoring. The res+dr.c of the te.t'tin,q use (a be repm'led on Division <br />approved forms. The perrniuee rill be required (o condos( h+•o Npes oj.cmti.ctical derivarion.c on the data, one <br />looking jor unv .rtalisticn/ly significant difference in (o.riciry behveen the control and the e~uent cancentrarion.c <br />and the second ideas fi~ing dre lC~r, shoo/done exist. Borl+ sets ojcalculations will look nt the full range of <br />to.riciry QedrnliN, growth and reproduction). lja level ojchronic toxicity occurs, such rhos there i.c a <br />s(nn:cricn!ly .ersnificunr difference in the lethnlih~ (nt 7lre 95% confidence level) behreen the control and any <br />effluent concentration lecc rl+mt or cyan! m the ln.ctream Wuwe Concentrorimr (/WC') unr! ijrhe lethality lC.~s < <br />the IWC, the permittee x•ill be required to jollnw the nutornaric cornplinnce.rchedule identified in Part l.B ojrhe <br />permit, ijthe observed mxiciR~ is due to organi.crn lethuliR~. Once the chronic IethnliN limi(nlion becomes <br />efjer(ive, only exreedunee ojrhe limimtinn specified in Part /..9. 2. x•ill trigger the reynirement jor conducting <br />the automatic compliance schedule identified in Part /. B. ojrhe permi[. Prior to and after the limitation <br />becomes effective, ij the to.ricirp is due to differences in the growth ojrhe fathead minnows or the reproduction <br />ojrhe Ceriodaphnin, no immediate action on the part ajlhe permittee x•ill he reyuired. However, this incident, <br />along x•irh other WET dam, will be evalunled by (he Division and may form the bu.cis jor reopening the permit <br />and including additional WET limits or other requirements. <br />9) General /njonnn(ion: The permittee .choald rear/ tl+e WET testing sections of Pan /.A. and /. B. ojrhe permit <br />cnrejully. The permit outlines the test requirements and the reyuired follow-up uctionr the permittee must mke <br />to resoA•e a t2riciry• itrcidenl. Tire pennNlee should rend, nlarrg with the daarmentc listed br Pur( /. B ajdrz <br />permit, dre Colorado Wuler Ounlih~ Control Division Biomonitorinc Guidance Document, doled July 1. / 993. <br />This document outlines the criteria used by dre Division in such areas n.r grenling re/iejjrom WET telling, <br />modifi•ing sell medrodc and d+anging (e.c! species. The perrnitlcz slrauld he <nvnre rho! souse of the condt(ianc <br />outlined above may be .subject to change ijrhe fitcil/tp erperience.r n change in discharge, u.c outlined in Pnrt <br />II.A. l ojdte permit. .Bach changes shall he reported to the Uivieion immediately. <br />Because .surface nrnojf is not expecler/ (o be toxic. ou(fn/lc 004. 007, 009, 0! ! - 02 / are exempted nt this time from <br />WET te.crirtg. However. the Division re.cervec the rig/u to reopen the permit (o include WET testing, .chotdd fireiliry• <br />condilionc change or if new information becomes nvailuhle. <br />4. Srorrmcaten Acrice and inactive coal mining nperntion.c where.ctormwnler comes into contact with overburden. <br />rmv materia/, inter'medinte produces, byproducts, fini.cl+ed products or x~u.cte products located n! the mining .cite rrre <br />insladerl in nuego!v (iiiJ ojrhe federnl.etorrnwulcr regu/a(ions. Such jncilitie.c ere reyuired to bore applied for n <br />permit to discharge .rtormx'nter ns.rocinted with mining activin• on or before October 1, 1992. Cyprus' Empire Corp. <br />cubmiued an applicntion,jor u general permit fiv .cronmvnter discharges for the Eagle Mine Complex on Ocroher 6, <br />/ 992. Thi.c firci/iR•'.c cerrificution under !/re genera! permit 6ecume effective nn iVovemher 5, 1992. The Eag/e Kline <br />Complex certification number ie' COR-040083. <br />