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PARTI Page No. 6 Permit No. CO-0032115 A. DEFIIVITION OF EFFLUENT LII~IITATIONS 1. EftlueM Limitations (continued) (c) OtdfaLLs 001. 002. 005. 009.011. 013. 015. 016. 017. 019. 020. 021. and 023 (coutinued] Any discharge or increase is vohune of a discharge cattsad by precipitation within any 24-hour period erecter than the 10-veer. 24-hour evem (or series of storms or stmwmeh of equivalent vohmte) may comply with the following limitations subject to burden of proof requirements descnbed in Part I.A.2. Effluent Parameter Disch aree Limitations 30-Dav Ave Daily Max Flow, MGD Report Report Total Suspended Solids, mg/t Report Report Total Iton, mg/t Report Report Settleable Solids, mf/t N/A Report pH, s.u.(min.-max.) (009,011,013,015,016,017,019,020,021, 023) N/A 6.5-9.0 pH, c.u.(tninimttm-maximum) (001, 002, 00~ June -September N/A 6.5-9.5 October -May N/A 6.5-9.0 Oileod Grease, mg/Q N/A 10 Whole EffhterY Toxicity, Acute N/A LCD > 10096 (d) OutfaLLs 003. OOti, and 014 PRIMARY LIMITATIONS Etfluettt Parameter Dischartee Limitations 30-Dav Ava Daily Max Flow, MGD Repot Report Settleable Solids, mt/t N/A 0.5 pH, s.u.(min;m„m_rr ~t;m,.+~) N/A t1.5-9.0 Oil end Grease, mg/t N/A 10 ALTERNATE LUIIITATIONS Any discharge or increase in volume of a discharge caused by precipitation within any 24-hour period greater than the 10.vear. 24-hour event (or series of atorma or atwwmelt of equivalent vohtme) n~ comply with the following limitations subject to burden of proof requirements descnbed w Part I.A.2. Effluent Parameter Discharse Limitators 30.Dav Ava Daily Max Flow, MGD Report Report SaWeabk Solids, mt/t N/A Report pH, s.u. (mini~tm-maximum) N/A 6.5-9.0 Oil and Grease, mg/t N/A 10 2. Acute WET Testing - OutfaLLs 001. 002. 005. 009. 011. 013. 015. 016. 017. 019.020. 021. and 023 (a) Testing and Reoortina Retmiremenfs WET testittg shall be requited whenever the discharge contains any flow from mine water a~/or spoils spring sources. WET testing is net required whro a discharge consists ootirely of surface runoff. If discharge from any appGcabk outtaB contains mine water and/or spoik spring water at env time dtuing the appropriate mottitoring frequency period (quarterly for outfalls 001, 005, 009, 011, 013, 015, 016, 017, 019, 020, 021, and 023; and semtamuelly for outfa11002), WET testing is required during the period that these sottrces are discharged. Tests shell be done az the frequency listed in Part I.B.1. Test results shall be reported along with the Discharge Monitoring Repoli (DMR) submitied for the mpotting period during which the sample was taken. (i.e., WET seating results for the first calendar quaver ending March 31 shall be reported with the DMR due April 28.) See Part I.C. for Definition. Amendment No. 1 Issued MAY 30 1997 Effective JL1I.Ol 1997 Amendment No. 2 Issued DEC 17 1997 Effective FEB Ol 1998 Amwdmeot No. 3 Issued OCT 26 1998 Effective DEC 1 1998 Amendment No. 4 Issued Effective