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COLOR:tpr) p[P.IItTI-IE:V-( OF PL%BLIClIE.ILTH;I;VD E:VVIROrVdIE:~'!'. '•bi:n,r Quarry Control Divc,ron Rutrurul~• ;Ir,;enn'^:cntr:4~ 1 Page 7. P~:rnut:Vo CO-000022! .+ Grneral Dt(nneutinn ~ Tiee penmuee should rend die acute ll"ET resting section in Parr l.:l 4 0(t{re • neruru for infornmnat uppltcable ro drew new drscharges. 77re permit outlines the te: r ~e,uiru.^.znts and the required Jullnw-up rrcnons the pennuree must r:ke to resolve a rosiary uuident. T)te permutee should rend, along with the doamtenrs listed in Part LA d.a. of the permit, dre Cnlnrndo Wnrer Oualin Control Drvisiun Biomanirorirty Guidance Doaunertt dated July !. 1993. This docurnen! ourhnes the criteria used b~; rite Divisron m such wrens as grmuing reliefJrorn 64'ET resting, modrJ}vtg test merhoa's mu( changing rest species. Tire penniaee should be aiyare that some of the corditions outhned nheve muy be subject m chm:ge rjtlre jncility expenerrces a chm+pe ir. drsc'lmrge, ns oru!inerl m Farr 1l .d. 2 of the permit. Such changes shell be reported m the Drvisrwr munedmtely. ~) Eremprinn for Srrrfnce Rrm~ Only - Out nll 01 ~: The dadrurges from ourfall 015 contain sur(nce rturofJsolely and do not contain roeic pollutants in tonc mnuurus On this basis, WET resnng is not a requrement for rhrs Darla((. However, the Divisron resenes the right ro reopen the pennu to mchrde WET resting, should facility conditions change or if new tnfornmnon becomes available 6) Species Grange jot Out(al! 005: The perntittee requested that, for Darla(( 005, rite test species 6e changed from Ceriodn r~hnin sp. to Daphnia magna. They submitted sgoporting labornrary data demonstrating that iugh salinity caused test failures with Ceriodnphnia. while Daphnia magna passed in concurrent rests on two instances in July 1998. This change is approved. Part 1.A.4.a. of the permit is amended to reflect this change. B. r~lonitoring 1. Efflrent Monitoring: Effluent monitoring for the new ott¢a11s will be regrrrred as s/toivn in Tables V/-4 and Vl- 5. Refer to the permit jar locations of monitoring points. • Nlonitonng_Frequencv Reduction: The permutee requested that the monitoring frequeny for all outfalls except 003 be reduced to monthly for the three parameters for which weekly monitoring is now required (p Fl, oil & grease and flow). They asked that the weekly frequenry remain f-or ougall 003 because it receives Jlo}v from dte shop area and the truck wash and the quality may be more rarinble. The other ourfalls primarily receive surface renoff front dirturbed and undisturbed areas. The permutee cites problems accessing remote areas where many of these orttfalls are located (even in good wencher became there ore no roads), the luck of noncompliance with these field parameters, and rite cost ojsanrolin¢ and analysis as the primary reasons jot this request. The permutee provided dnra on compliance for existing orttfalls from 1980 through 1998. Ourfn!(s 002, 005, 008. 009. 010 and 011 trod no pN excursrons during this period. Otttfall 004 had six excursions our of 727 measurements. Tire excursions occurred between 1984 and 1987 and were attributed to algae. Orttfnl! 006 had 8 excrrsions, all occurring in 1990 and 1991. These excursions were also attributed to algae. None of t/te exceedences were attributed to the sources directly. Only Darla(( 003, which receives Jlow from the truck wash sysrern, has experienced any oil and grease excursions. This were prior to 1991. Installation of oil booms prevent future occurrences. None of the outfal(s have or had flow limitations. The Division is applying this request to t/re currently authorized outfnlls. The permittee will install remote monitoring equipmentlorJloty and pH at the new outfalls 012 through 017. This will enable them to fulfill the weekly monitoring requirement. However, it still would be diffiadt for them to access these sites on n weekly basis to make v+sual oil and grease obsen-rations. So. [hey will install and mainmin ail booms at these outfnlls. On this basis, rlre oil mid grease monroring frequency will be c'lranged to monthly. The flow to these ponds is pmm~rily surface nmoff from disntrbed mrd undisturbed areas. 777e Colorado Division of rtiGnerals and Geology (CDh1G) specinlisr assigned to rhrs mine complex has indicated that there . should be no Jiow that would cause nn upset resufring in unraua( effluent quality. The CD+~IG has ne objeuion ro a monuonng frequency reductiai