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COLORADO DEPARTMENT OF HEALTH, Water Qunliry Contro! Division <br />Rr+tiorrnle, Amendment No. 2 - Pnge 3 Permit No. CO-0032115 <br />The /WCjor this permit is 100%, which represents a wastewater concentration oj100% e,B7uent to 0% receiving <br />snrnm. <br />Hors•ever, in addition to the /WC value for determining whether chronic or ncure WET testing requirements nre <br />npplicnble, the classification ojrhe receiving stream must be considered. According to the Colorado Wnler O+rnlity <br />Corrtro! Division Biomonitorirra Guidnrrce Document, dated July 1, 1993, chromic WET tesrirrg is required for <br />facilities where the receiving stream has a Class 1 Aqunric Lije use or Class 2 Aquatic Life use x•ith all ojrhe <br />appropriate nqunric life numeric srnndnrds,' otherwise, acute WET resting is required. <br />Since the receiving waters nre classifred ns Class 2 Aquatic Lije use and do not hove all ojrhe appropriate nqunric <br />1 je numeric srnndnrds, the Division has determined that ncure WET Testing is npplicnble for this permit (see <br />following paragraph). <br />3J Acute WET Limitations: The Division rnnsiders the aquatic life classhcation and uses of the receiving water in <br />determining whether acute or chronic WET requirements are imposed. Because the receiving water is classified <br />nyunric life c(nss 2 x•irh no appropriate nqunric life numeric srnndnrds, ncure requirements apply ro this discharge <br />irrsrend of chronic requirernenls. The porerrrinl jot toxicity in con! mine drainage is demoncrrnted by n grox•irrg <br />Divi.sinrr darn base of WET rest failures, including some jniluret nr rhic jnciliry. On this basis, ns required utrder <br />section 6.9.2(5) ojrhe Reeulmiorrc for the Srnte Dischnree Pennir Susrem, the Division finds there is reruonnble <br />potential ja' the di.cchnrges frosts aurfnlLr A02, A05, 0:09, 011, 013 mrd 015 to imerjere with attainment of npplicnble <br />uvner quality clnssificnrioru or srmrdnrds. Because ojrhis cond6ion, the ncure limitation has been imcorpornred into <br />the permit. The pennirree is required to conduct routine nronirori+rg, the results ojwhich ore to be reported ns nn <br />LCso. If the LCsa 5 !00% effluent, the permirtee is required ro corrducr the automatic complinrrce schedule ns <br />idemtified iu Pnrr /. B. ojrhe pemrir. 77re results ojrhe resting ore ro be reported on Division approved fonrrs. <br />4J Gerrernl !rr(arnrntion: The permirtee should read the WET testing seniotrs of Pnrt /.A. nrrd I. B, of the permit <br />cnrefidly. The permit ourlirres the rest requirements and the required follow-up nctio»s the permiuee must rake to <br />resolve n toxicity irrciderrl. The permirtee should read, along with the documetrrs listed irr Pnrt /.B of the penrrir, the <br />Colorado Water Ounlity Control Division Biomonirorinp Guidance Document, doled July 1, 1993. This document <br />our(ines the criteria used by the Division in such nreru ns grnruing relief from WET resting, modhing rest mediorls <br />curl chmrging rest species. The permirtee should be aware rlml.come ojrhe conditions outlined nbore may be .cubjen <br />m ehmrge if the jnciliry erperiences n change in di.rchnrge, ns outlined in Pnrr ll. A.1 ojrhe permit. Such changes <br />~hn1l be reporter/ ro rlre Division inrrrredintely. <br />Yll. PERAfIT PACES AM1IENDED AS A RESULT OF TH/S AMENDd1ENT.• <br />As n result of shit nmenrbnent, pages /n, /b, Ic, Id, le, If, Ig, Ih li. lj, Ik nrrd In ojrhe permit nre being nmenrled <br />and pn,gro 2, 3 and 4 are being rleleterl. <br />Jon C. Kubic <br />January 6, 1994 <br />Yll. PUBLIC A'OTICE COAIA9ENTS: <br />