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<br />Table E51-24 <br />Site 115 Discharge Rate Calculator -Sample Results <br />for Maintaining Sulfate at or below 250 mg/L in Trout Creek below Fish Creek <br />C„ Conductivity, Baseline Instream (Site 1005) <br />Q„ Flow Rate, Baseline Instream (Site 1005) <br />Cg Conductivity, Site 109 discharge (3900 umhos/cm) <br />Qg Discharge Rate, Site 109 (342 gpm) <br />Cd Conductivity, Site 115 discharge <br />Qd Discharge Rate, Site 115 <br />CT Conductivity, instream (Site 1005) <br />Qdg Qd + Qg <br />Qd= (CuyQu) (Q9 C+9) - (C+T~Qu) " (CT~Q9) <br />~T-C+d <br />For calculated instream sulfate: sulfate =conductivity' 0.38 <br /> <br /> <br /> Trout Creek Belo Trout Creek Below <br /> Fish Creek Fish Creek <br /> Site 11 5 Baseline with site 115 <br /> Qd Cid Q~ C~ Qdg + Qu <br />Case Discharge ! Cond. Disch. ! Cond. Disch. I Cond. !Sulfate <br /> cfs I m ' umhos/cm cfs I umhos/cm cfs !umhos/cm ' m L <br />Baseline mean flow, 0.67 I 300 ~ 7300 72.4 ! 527 73.1 ! 631 202 <br />Case 1 high load I I ! ! ! <br />Baseline low flow, Case 0.67 I 300 I 7300 23.4 560 24.1 ! 874 ~ 280 <br />1 high load I I I ! <br />Low flow 1997, Case 1 0.67 j 300 j 7300 20.7 741 21.4 ! 1089 I 346 <br />high load ! ! <br />Ave. cond. 1997, Mean 0.67 ~ 300 ~ 7300 31.6 689 32.3 ! 920 ! 295 <br />flow, Case 1 high load I I ! <br />1997 mean cond., Case 1.34 I 600 7300 46.0 527 <br />! 47.3 I 783 ! 251 <br />1 high load i ~ ' <br />Hypothetical -Case 1, 0.67 I 300 ~ 3900 55.6 I 689 56.3 ~ 781 I 250 <br />1999 -Flow Required <br />Hypothetical -Case 1, 1.34 ! 600 ! 3100 66.6 ! 689 68.0 ! 781 ! 250 <br />high load -Flow Req. ! ! ! ! ! <br />Baseline: Flow and TDS from Exhibit 32. TDS converted to conductivity: <br />Condcuctivity =TDS '0.75 <br />1997 Data: 1997 Annual Hydrologic Report <br />Hypothetical: Instream sulfate set at 250 mg/L and discharge rate calculated to <br />to achieve set instream (w/o Mine discharges) flow rate <br />T(i07-59 <br />Table E51-24 <br />04/02/07 <br />