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Flows and Dissolved Solids for Mass Balances <br />Location Flow Dissolved Solids <br />Normal Year Dry Year <br />cfs cfs ma/1 <br />Stn. 3700 33.7 1) 1.46 1) 423 1 <br />TCC - Foidel Mine 0.28 2) 0.28 2) 2283 3 <br />Eastern Backfill 2.06 4) 0.59 5) 4000 6 <br />Western Backfill 2.91 4) 0.83 5) 2711 7 <br />Mine 3 0.34 4) 0.10 5) 527 8 <br />Little Middle Creek 0.79 4) 0.23 5) 4000 6 <br />Total 40.1 3.49 <br />Notes: 1) USGS data for stn. 3700 <br />2) Mine discharge routing plan <br />3) Mean concentration, 1986 (Table A-2) <br />4) Calculated mean spoil spring flow during spring runoff <br />period, 0.67 gpm/acre. Derived from data in Backfill <br />Hydrologic Evaluation, Eckman Park Mines, April 1986. <br />5) Normal year low flows divided by ratio of normal year <br />to dry year stream flow, 3.5:1 (Low flaws from Revision <br />to Backfill Hydrologic Evaluation, 6/26/86. <br />61 Revision to Backfill Hydrologic Evaluation, 6/26/86 <br />7) Average salt concentration of springs above Pond A, <br />5/19/86 <br />8) Average salt concentration of springs at Mine 3, <br />5/20/86 <br />Salt Balances for Surface Water Recharging Alluvium <br />Low flow year: ((1.46 x 423) + (0.28 x 2283) + (0.59 x 4000) + <br />(0.83 x 2711) + (0.10 x 527) + (0.23 x 4000))/3.49 = 1959 mg/1 <br />Normal flow year: ((33.7 x 423) + (0.28 x 2283) + (2.06 x 4000) + <br />(2.19 x 2711) + (0.34 x 527) + (0.79 x 4000))/3.49 = 857 mg/1 <br />Salt Balances for Alluvium <br />Low flow year: ((1959 x 1) + (1016 x 7))/8 = 1134 mg/1 (12% increase) <br />Normal flow year: ((857 x 5) + (1016 x 7))/12 = 950 mg/1 (6% decrease) <br /> <br /> <br />• <br />24 Revised 10/1/86 <br />