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COLORADO DEPARTMENT OF HEALTH, Water Qrrnliry Control Division Ranunule - Pnge 6, Permit No. CO-0043567 Trrhle V!-4 -- Federal Standards Prrrnmeter 30 Day Avg Concentration Daily Max. Concentration pll, s. u. (minimum - maximuntJ ---6.0 - 9.0--- Turn! Suspended Solids, mg/P* 35 70 Tuml lron, mg/P* BAT" * 3.5 7.0 NSPS*** 3.0 6.0 Scrdenble Solids, mP/P* N/A 0.5 • 17rrv parnmerrrr subject m Burden of Proof RePuiremmv, ter n¢r recdan •• nr.r n~mlaMr Trrlmoloay - apptia to dtom poMr already raruwrred ••• .~'r„ .Source I'erfomiancr Srandnrdr - appLv ra those pondr ranrnunrd afire SRY/81 Alternate Limitation Burden of Proof Requirements: /n canjormance with 40 CFR 434.63, the permittee has the burden of proof wren requesting relief from total suspended solids (7'SSJ, total iron and/or settleable solids limjtations, ar appropriate. RelieJslrall be granted only when necessary and shall trot be granted when the permittee has control over the discharge. 77re permittee should endeavor to meet the primary limitations whenever possible. T/ris relief is not available jot total recoverable iron for aujnlls 001 -003 because dre limitations are based on CO water qunliq~ standards. Fnr rainfall, to waive TSS and total iron limitations, it is necessary to prove that discharge occurred x-ithin 48 hours after measurable precipitation has stopped. /n addition, to waive settleable solids limitations, it is necessary to prove that discharge occurred within 48 hours after precipitation grenrer rhnrs t/re 10-year, 24-hour event has stopped. For snowmelr, ro waive TSS and total iron limitations, it is necessary to prove shat discharge occurred widrin 48 hours after pond inflow has stopped. /n addition, to waive settleable solids linritntions, it is necessary ro prove that discharge occurred within 48 hours after pond blow vohrme grenrer than the l0-year, 24-hour event has stopped. The Division shall determine the adequacy ojprooj As parr of dris rlererminntimr, the Division sheet! evnhrnre whether the pernriuee could have controlled (he discharge in such n manner the[ primary limitations could have been met. A!I manual pond dewntering nvrsr meet TSS and torn! iron limitations. cJ Anrideeradarion: Since the receiving water is Use Protected, mi nnridegrndarion review is trot regrrtred pursuant ro section 3.1.8(1 J(bJ of The Ba.cic Sranrlnrd.r and rt9erhorlolo¢iesfbr Surface Water. d) R7role Efiluenr Toxicity (li'ET1 Terrine: For this Jacilin~, chronic R'ET resting is required jot outjnlls 001, 002 mrd 003. (See Parts 1. A and !. B of the pernrir. J The just test of each ourjnll shell be of snnrplrec collected drying dre first instance of dischmgr ojmine drainage. lJ Porrpose of WET Tectine: The Wnrer Qunlin• Control Dicl.eon Ims established the use of WET testing as a method jot idemifi~brg and conrrn(ling to.~~rc discharges from wa.crewarer vearment facilities. WET resting is being utilizer! ns n means ro ensure then riiere are nn rhsclmrge.c ojpollutruv.c "in nnrnrmn, concentrnrions nr cond~inntions ~+-0rich are hurn~d ro rho beneficial uses nr ro.ric ro humans, nnimnLc. plrrntc, or aquatic life" rrs requved by Sr-ena~ 3. I. // (JJ n(rhe Bn.cic Srrrndnrdc melt 69erhorL~lneie.c nr ' Sur(nce !farces. 2J ln.rrrenrn R'n.cre Concentration (lWC1: Rrhere monitoring or limitations for R'ET tree deemed appropriate by the Division, chronic insrream diluliorr as represented by the chronic /WC is critical in determining n-herher acute or chronic cmrdirions shall apply. Fnr those discharges x•here the chronic 1R'C is grenrer than (> J 9. / `:o, chronic cmrdirians apple, r~~here the /R'C is less than or equal to (5J 9.1 none condirion.c apply. Tyre chronic /IfC is determined usm,g the joIla.ving equation: llfC = /Fncilin• Flon• (FFJ/(Stream Chronic Lon• Flnrv (rmrnml/ - FFJ/ :g l00°io T/rz• flurv~ and eurrerpunrling /lfC fen uurJnll.r 00/ - 00.7 mr ~i;n rn m lln- (r/lmrin~ table.