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ri ~ui~ rua io: os rtid JOJ i8lObbo CDYHE/FOCD ., _ ---...' -'_;..I~OOb <br />.~, :, , _ - <br />COLOR,IDODEPARTMEN!'OFPUBLICFIF.IfJHANDENVIROIVbfENl;Wate-QualityControlDivision _ ! <br />Amendment No. 3-Rationale. Poge 4, Permit No. CO.0000131 <br />Where: ' <br />Qr =Upstream !ow jlow (4l cjJ~) <br />Q, = Masimttm discharge jlow (0.45 cfs' or O. Z88 MGD) <br />Q =Combined downstremn Jtow (Qr + Q~ <br />Mr =Upstream badcgrormd polluant rnncenrration - represerrcr the mean of quarterly samples avlkered !n 1.998 <br />by the perndtree as required by the Colorado Division of Morerals mut Geology <br />Mr Unbwwn; Mamnran allowable eglaent pollutant conanrration calculated using mars balance equation <br />M, = Maxinwm dmvnrtnam dlowable pollutant Concentration (WQS Jor segment 3) - <br />the term M,Q,, represents the mass oja pollatmrt that amrr bt carried by the receiving stream wir/rout violating stream . <br />standards. lht term MrQr represerus the pollutant load that alrattty crises instream above the discharge point in <br />grrestiort. The di~'erence between the two loads, which rs M,Q, - AftQr, repruents the loading that osn be allocated to <br />the discharge. <br />The Division will artAwrize this discharge. AB terms and mttdltiotu, otcletdtng e,8`Irtent limitations aced monitoring <br />rogrdremenra, that crursntly apply ro oaefaB 011 wiB apply to this temporary discharge point Additionally, to vtriJy <br />that the discharge metals rnnantrarions are intlgnifitant, the Division wiU require, by separate letter, a second mttais <br />analysis using the lowest method detection ltvd. These results wlll be reviewed. Ijthere it reason for concern that <br />the discharge may acted potential (imitations, the Division weB work with the permirtee to assure that adequate <br />treavttott it occarring, and may reopen the perndr to take appropriate anion. <br />Additionally, since whole e~laent taziciry (WET) testing is required jot orujall Olt on a quarterly basis and no <br />discharge has occurred from the permmtent discharge focation daring the sewnd calendar quarter of 1999. the <br />Division requests that the permirree collect a sample for this purpose from this temporary outfall during the first week <br />of disrlrarge. This will provuk an additional measure of the quallry of shit discharge. This sample will count as the <br />routine sample jot the second gaarter that is required under Part LB.1. (b) of the permit. <br />This authorization is for acne-time thortderm activiry only. The perodnee projects that when the Wrote reopens, <br />propping will restune and discharge will occur at the authorized mine worer discharge point, orafall Oll. If the <br />perndttee determines that this o}Jtaw to the mine wiB 6e cJvotrlc and this water will need to be discharged on a long- <br />term basis, thry will need to submit a request for a permanent amendment to authorize ir. <br />fFgure 4 is being added to the permit W show the location ojttmporary ourfal1011. This ftgure it added as page 21a <br />of the permit. <br />Because this action does not change any permit Conditions, tt is rtot subject ro public notice provisions. <br />!on C. Rublc <br />April 30, 1999 <br />