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COLOR4D0 DEPARTd1E;\7 OF PUBLIC HE,3LTH.AND ErWIRONbIENT, W<uer Quahrv Conrro[ Drvrsmn <br />,~merrdrnent rVp. 5-Rationale. Page 4, Permit No. CO-000013? <br />• Strch a review has been done for this new ourfnll. The ordy parnuteters for which the Division has determined <br />rho[ a rensor:abie potential exists to impna the water quality standards are shown in Table VI-1 with rite <br />applicable limitations. The base for these lunitations is diseased in sections Vf A.3 and Vl.,a 3 <br />Table V7-1 -- D•(f/tten! Limitations <br />Discharge Limitations <br />tllaxinnurt Canceutrn[ion.t <br />Parameter 30-Day AVQ. Onity :flax. Ra[ionale <br />Flow, hIGD Repot[ Report Facility Capacity <br />Torn! Suspended Solids, mg/P 3$ 70 Federal Effluent Guidelines <br />Torn! /rmr, mg/P 3.0 6.0 Federal Effluent Guu/efines <br />Oil and Grease, mg/P N/A !0 State Effluent Regulations <br />pH, s. u. (~Llinimum-Maeimum) N/A 6.5-9.0 Wnrer Qunliry Standards <br />Toro/ Dissolved Solids, mg/P Report Report Salinity Regulations <br />Whole Effluent Toxicity, Chronic Lethality N/A No Statistical State Perrnir Regulations <br />Diffar'vnrv <br />2. Disctasion of Effluent Limitations <br />J <br />a) Regulations for Effluent Limitations: 17re Regulations for Effluent Limitations (5 CCR 1002-62), apply to the <br />conventronal pollutants. For this facility the limitation for Oi! and Grease is based on this regulation- <br />bJ Aoolicable Federal Effluent Guidelines and Standards: The federal guidelines whicJt apply to this type of <br />facility are found under 40 CFR 434, titled Con[ Minine Point Source Effluent Guidelines. The limitations <br />which apply to discharges of mine water are: <br />Table V/-2 -- Federal Standards (40 CFR 434) <br />Parameter Limitations <br />30 Day Avg. Daily Maz. <br />pH, s. u. (minimum -maximum) ---6.0 - 9.0--- <br />Total Suspended Solids, mg/P 35 <br />• <br />70 <br />Total Iron, mg/P <br />BAT• 3. S 7.0 <br />NCP.C'* 2 0 F 0 <br />* Best Available Technology -applies ra those facilities already constructed <br />•* New Source Performance Standards - applies to those facilities constructed after 5/4/84 <br />c) LVater OtraliN Standard fwOSl Based Effltrertt Limitations: the WQS for pH of 6.5 to 9.0 applies directly ro <br />the discharge to Elk Creek. Tire Division was only able to perform a preliminary reasonable potential <br />analysis for odter venter quality-based parameters using the dam provided by the permittee since the tiara <br />were from locations other than the actual disdrarge point. This permit veil! require additional short-term <br />monitoring of new ottrjafl 015 jot those parameters for +vitich a potential to exceed applicable WQS may <br />eeist, based on the data submitted. TTtese parameters ore tout! recoverable arsenic, total recoverable <br />cadmium, dissolved iron, mid dissolved manganese. <br />