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COLOR.IDO DEPART,NL•NT OF PUBLIC HE~ILTN ArVD ErVV1RONME:V1', Wuter Quuliry Carrrrol Ditii.rian <br />Ratiana(e, Mrendrneru No. J -Page :. Permit ,Vo. CO-0OOOIJ2 <br />PURPOSE OF AMEND,IIENT <br />By letter dared June 27, 199J, the permirtee requested addition of a new aurjal! ro serve as discharge paint from a <br />sedimentation pond consrrseed ro control runafffrom a new high uo4age substation. rl.r shown in the above table, the <br />disrharge will go ro the North Fork of rfre Gunnison River. <br />IV. RECEIVING STREArLI <br />A. fdenriJication, Classification and Statdards <br />1. Idenrihcnrion: New outfall 013 discharges to the North Fork of the Gunnison River, Segment 3 of the <br />North Fork of the Gunnison River Srtb-basin of the Gunnison River Basin. <br />2. ClasriRcnrion: 71ris stream segment is classified for the following uses: Recreation, Cars 2; .iquaric <br />Lije, Class I (cold); Agriculture. <br />3. Numeric S~nndnrds: the statdards which have been assigned in accordance with the above <br />clarriflcarions can 6e found in 3.5.0, Classifications rrtui Nruneric Standards for the Gunnison mrd <br />Lower Doearer River Basins (S CCR 1001-8), at amuufid September 7, 1993. 7hir outfall does not <br />discharge any pollutants that are limited by water quality standards with the aception of pK. <br />4, gntideeradariort Review: The aruidegradatian presumption is overcame because the dilution ratio it <br />greater than 100:1. Although this outfall will not discharge during law flaw rnnditians, an assumption <br />of the worst case rs made. the chronic !ow flow jot the No. Fk Gunnison River is 28 cfS, if the emire <br />volume of the pond war descharged this would be 0.023 MGD or 0.036 efi. this results in a dilution <br />ratio of 777.•I. On thin basis, further reviewrs mt requirrd pursuant to section 3.1.8(1) of a Basic <br />Standards and Methadoloeiet for Surface Water. <br />B. Receiving Waxer Data <br />1. Ounnrirv. Acute and Chronic Low Flows: Ihere flaws are not required for effluent Gmitarion <br />determination. <br />V. TERMS AND CONDITIONS OF PERMIT <br />A. Detennittatwn of EjJlueru Limitations <br />1. Effluent Limitations : Ilu following limitations will apply ro ruw outfall 013 and art discussed in <br />following reaionr. <br />Table V-1 - Ej/luent Lim itadons For Outja![ 013 <br /> <br /> <br />Parameter .;' `:.:`:;';:'.;;.;~;~; ,... <br /> <br />'.:s:;:.:.:.::':.:i .:::::.:: ::.:Ltmitaaart~::;: ,.. <br />;....: . <br />:..;:: < ":.::':: <br /> <br />.:•.; r. Ratrattala .:.:.,:: .::: ::: .:. •.: <br />Flow, MGD Report Design Capacity <br />TSS, mg/e• 3S/70 b/ Federal BAT•• <br />Iron (Total),rng/P• 3.0/6.0 b/ Fedora! NSPS*•' <br />Settleable Solids, me/e• 0.5 c/ Federal BAT'• <br />Oi! and Crease, mg/e 10 e/ State EjJluent Regulations <br />pH, s. u. 6.5-9.0 d/ Water Quuliry Standards <br />IDS, m.q/f Report Salinirv Regulations <br />