Laserfiche WebLink
COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Wnrer Qun[in~ Corrrro! Division <br />Rminnnle - Pnge l0, Pern+ir No. CO-0038776 <br />For rairjnll, ro wnive TSS and torn/ iron limirnrions, it is necessary ro prove rhnr dischnrge occurred within 48 <br />hours after measurable precipitnrion has stopped. Irr nddiriorr, to wnive settlenble .solids limirnrinrr.c, it i.c <br />necessary ro prove rhnr dischnrge occurred within 48 hours nfier precipitnrion greater (hmi the 10-year, 24-hour <br />event has stopped. For srrowmelt, to waive 7SS nrrd total iron limitations, it is necessary to prove rhnr <br />discharge occurred within 48 hours offer pond inflow has stopped. In addiriorr, ro wnive settlenble solids <br />limitations, it is rrecessnry to prove that discharge occurred within 48 hours after pond ir~oH~ volume greeter <br />than the 70-year, 24-hour event has stopped. <br />The Division shell determine the ndequnty ojproof. As parr of this derermirrariorr, the Division she[[ evnlrrnre <br />whether the permirree could have rontrolled the dischnrge in such a manner rhnr primnrv limirnrions corrlrl hove <br />been met. All manual pond dewatering must meet TSS and total iron limirarions. <br />cJ Discussion ojLimitntiorrs For Outfnl! 007: Discharge from outjall 007 goes directly into surface runoff pond <br />MB-2R (outjall 004J. Since dischnrge from outjall 007 does nor go directly to State wnrers, the total residual <br />chlorine (7RCJ limitation shall not be imposed ar ourfall 007, but irutead ar outjall 004. This Neill enable the <br />permitree to meet the fecal coliform limimtion without concern far violming n TRC lindrnrion because erces.c <br />chlorine should dissipnle in the ponds prior ro dischnrge to store wnrers. On this scone bncis, pH nrrr! oil & <br />grease limirnrions ore nor being imposed tit outjall 007. These limirnrions already apply nr the point of <br />rli.cchnrge ro .cmre wnrers, nutfn!! 004. <br />dJ Pollumnrc Limirerl by Wnrer Ounlirv Srnndnrdr: For the tom/ recoverable iron limimrion for outjall 011 .chmrn <br />in Table Vl-4 and for the torn! residual chlorine limirmion for ou fall 004 shown in Table Vl-/, the mars balance <br />equation shown in Vl.A.2. was used to enlculnte the allowable e,JJluenr limirnrions rhnr world nor cnuce the <br />water quality srnrrdnrds to be violated. These limitntiorrs ore shown as the values jot Mz in Table V!-S. The <br />values jot Qt, Qt nrrd Q3 jot chronic and acute limirnrions, token front section //I. B. 2. of rhi.c rnrinrrnle, asst/ <br />used in the cnlculnrions far water quality limited pnrnmerers ore: <br />Outjall 01/ - to Sylvester Gulch <br />Flow Chronic (30E3) <br />Qr <br />QI <br />0 cfs <br />Q~ <br />• No flow limitation is specified pht permiurr hat irrdicmrd that rherr is nomm//y no dischorgt from this mufnll). Hnwn~rr. hrcnu>r +hr <br />(ow flow is xrro, regardless of rhr g8lrrrnt flow, rhr (imitation rgrraLt rhr standard. <br />Outfal/ 004 - to the Nor/h Fork of the Gunnison River <br />Flow Acute (I E3) Chronic (30E3) <br />Q r 28 cfc <br />Q1 o.2e rfc <br />41 cfc <br />0.12 cfs <br />Qa 28.26 cfs 41.12 cjs <br />Table V/-6 -- Summary of Mass Balance Calculations <br />Pammeler Stream Standard, (M3), EjJluent Concentration, <br />Acute/Chronic (M2), Acute/Chronic <br />Iron (7RJ, mg/f (OUTFACE 0/!J -/1.0 <br />-/1.0 <br />Tora1 Residual Chlorine, rag/P 0.019/0.011 2.0713.77 <br />(OUTFACE 004) <br />