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COLORADO DEPAk'1'?l1iNT IIP Hh:Ai,Tll <br />• Water Qualify Control Uivisiou <br />Nationale - Page 7 <br />Permit No: CO-UU375i3 <br />APPENDIX 2 <br />I~:VALUA'I'Ii)Y 0@' PCRFIIT (.1hli'iS FC~!t UO~~ <br />Total Iron: <br />Annual Effluent Concentration = (~17-10 + Qmf) Cs - (Q7_10) Ca <br />Qmf <br />Where: <br />Q7-10 the annual 7 day-10 year lo.: flow value which has been <br />detet,nlned by the Division: 1.6 cfs <br />Qmf maximum mine water flow from the fac:llty 0.29 cfs (or i~'~ <br />gPm) <br />Ce stream etnndard for total iron: i..U mg/1 <br />• Ca ambient upstream concentration of total iron, assume' <br />maximum: 0.~ mg/1 <br />Thue, the total Iron effluent concentration was determined from the mass <br />balance equation as follows. <br />(1.6 + 0.29) (1.U) - (1.G) (0.5) _ .3.7G mg/1 total Iron <br />0.29 <br />Thus, the federal limit for total' iron for coal mine f~cilitlea of 3.5/7.G <br />mg/1 Sa appropriate nor disct~atgr_ point 004. <br />Llmlte applicable to discharge point 004 include: <br />Parameter Limitation <br />Total Suspended Solids, mF/1 35/70 a/ <br />Total Iron, mg/1 3.5/7.0 a! <br />pH, a.u. 6.5/9.0 b/ <br />011 and Crease, mg/1 10.0 c/ <br />B+isis Monitoring Frequc~ <br />isP'I' Monthly <br />l:A:'/3PC Monthly <br />k"~S Weekly <br />''J :S Weekly. <br />a/ 3(1 day av~•rafc/dai.l.y mnxl.mum <br />• b/ minimum/maximum f.or any :wimple <br />c/ mazimum for any sample <br />