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COLO2iD0 UEP. IRTYIE;VT OF PUBLIC HE.ILTH:I:VD ErVVIRONAIENT water Quality Cuntrnl Dn•tsrai Rwronc(e - rlmenrbxent No. I Pnge 7, Pennrt No CO-0000221 ~l Genera[ lnfnnuounn ~ T%re penrvrree skordd read dre untie 11"ET t_•sring section tit Purr l .I 4 of [he • permu fee utjornmtion appbathle m these new disci~nrges %:c permit outlines' the tear requirements un<! dre required follow-up nctiats d7e pennirree must take to resolve a toxian utctde'u Tite pennuree shurdd read. along wuh the documents listed of Part L.d d.a. of the permit, the Colorado Water Orrnlirv Control Dn•tsion 8romonumirrr; Guidance Document dater[ J« ly !. 1993. Tltis document our(mes the criteria used by dre Division in such arras as granting relreJ from L4'ET testing, modtfving test methods end changing lest species. T7te penntttee slmuld be aieare that some of rite conditions ouduied above roar be subject m change rf the jacdirv experiences a change u: discharge, as ourLfrted in Parr 11. A. 2 of the permit. Sudt dtanges shall be reported to the Dnistort rmmedmtely. i) Eremp[inn for $urfnce Runoff Only - Outfn[! OU: The discharges from outfa(t 015 contain surfnce runoff solely and do nor contain to.cic pollutants in roric anroruus. On this basis, 6VET resnng is not n requirement for this ourjall.. However, the Division resen~es the righ! to reopen the perntir to include WET testing, should facility rondinons change er if new mforniation becomes available. 6) Species Change jar Orufall 005: The pennirree requested that, for outfall 005, Ute test species be changed front Ceriodnphnta sp. m Daphnia magna. They subrni«ed supporting laboratory data dernonstrnting thnt high salinity caused test fai6<res with Ceriodaphnin. while Daphnia nragrta passed in concurrent tests on nvo instances in July 1993. Thrs change is approved. Part I.A.4.a. of the permit is amended m reflect [his change. B. tL/onitoring Effluent rLlonitorinQ: Effluent matitoring jot the new otttfalls will be required as shown in Tables VI-4 and VI- 5. Refer to the permit jot locations of monitoring points. • rvlonitorinq Frequency Reduction: The permittee requested that the monitoring frequency jot al! ourfalls except 003 be reduced to monthly for the three parameters jot w/rich weekly monitoring is rtow required (p H, oif & grease and flow). They asked t/tot the weekly frequenry re»tairt for otrtfafl 003 because it receives Jlotiv from the shop area artd the to<ck was/t and the quality may be more variable. 77te other outfalls primarily receive surface nrnoff from disrtrrbed and ttndisrttrbed areas. The permirtee cites problems accessing remote areas where many of these outfalls are located (even in good weather becatr-se there are no roods), the lack of noncompliance with these Jield parameters, and dre cost of sarnplmg and analysis as the pnmary rensons jot this request. The permittee provided data on compliance for existing ourfa(Is from 1980 through 1998. Outfalls 002, 005, 008. 009, 010 and OI l had no pH excursions during this period. Outfall 004 had sir excursions ortt of 727 measurements. 71te ercttrsiorrs occurred benveen 1984 and 1987 and were attributed to algae. Ottrfnll 006 Itad 8 excursions, all ocntrnng in 1990 acrd 1991. These excursions were also attributed to algae. None of the exceedences were attributed m the sources directly. Only onrfall 003. which receives flow from the truck wash system, itas experienced any oil mid grease excursions. This were prior to 1991. Installation of oil booms prevent future occurrences. tVone of the ottrfalls have or hod Jlo~v limitations. The Division is applying this request to the currently arttltorized orttfalls 77ie permittee will install remote monitoring equipment for flow and pH at the new outfa!!s 012 tltraug?: 017. This will enable them to jtrlj(1 the weekly mati[oring requirement. However, it still would be difficult jot them to access dtese sires on a weekly basis to make visual oil and grease obsenmrions. So, dtey will insmll and mainmin oil booms at these outfnlls. On this basis, the oil mid grense monitoring frequenry will be changed to monthly The flow to dtese ponds is primarily surfhce nrnoff from disuvbed mid undisturbed meas. T1te Colorado Division ojiLlinernls and Geology (CD~L1G) specinlrsr assigned m rhts mule complex has mdiaued dm; there • slmuld be no Jlow t/mr would cmtse nn apse[ resulting in unusual effluent quality. The CD+YIG has no abjection to a ntorumnng fregtrenry reduction.