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CULUHA DtJ D1:PAli'L?11SI1'I' UP IIhAl: rll <br />• Water iluallcy i:ontrul IiLv1::1un <br />kactuna Lc - P;i;;c 7 <br />I'c r;n LC No: CU-UU3;553 <br />APPENDSX 2 <br />hVALIIA'fI01! rIP L'1:RM1T LIM[TS PQR 004 <br />'fr,tal 1[u[t: <br />Annual Effluent Concentration (~7-10 + qmL) Cs - (Q7_10) Cu <br />Qm1 <br />Where: <br />x!7_10 tlrc annual 7 day-10 year low flow value wlrlch has been <br />determined by the Division: 1.6 cfs <br />qmf ° maximum mine water flow from the facility 0.29 cfs (or 130 <br />gpm) <br />r;u ntrcam uCau~lnrd f.nr total iron: 1.0 mg/l. <br />Ca ambient upstream concentration of total iron, assumed <br />• maximum: 0.5 mg/1 <br />Thus, the total iron effluent concentration was determined from the mass <br />balance equation ae follows. <br />(1.6 + 0.29) (1.0) - (1.6) (O.S) 3.76 mg/1 total Iron <br />0.29 <br />Thus, the federal limit Eor total iron for coal mine facilities of 3.5/7.0 <br />my,/1 Su appropriate for rliar.hargc point 004. <br />Limits applicable to dinclwrge point 004 include: <br />Parameter Limitation Basis Monitoring frequency <br />Total Suspr:nried Sollria, mg/1 35/70 a/ BP'P Monthly <br />Total Iron, mg/1 3.5/7.0 a/ BAT/BPT Monthly <br />pli, s.u. 6.5/9.0 b/ WQS Weekly <br />011 and Crease, mg/1 lU.U c/ SES Weekly <br />a/ 30 day average/daily maximum <br />b/ minimum/maximum for any sample <br />c/ maximum for any sample <br /> <br />• <br />