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• <br />~,~ v~~ <br />~° I~.' <br />• <br />r~ <br />LJ <br />Flows and Dissolved Solids for Mass Balances <br />Location <br />Min. irrig. flow <br />TCC - Foidel Mine <br />Eastern Backfill <br />Western Backfill <br />Mine 3 <br />Middle Creek <br />Total <br />Flow Dissolved Solids <br />orma ear ry ear ry ear ig ear <br />cfs cfs mq/L mq/L <br />-- 0.33 660 1808 <br />0.28 1) 0.28 1) 2283 2) 2283 <br />0.18 3) 0.05 4) 4000 5} 4000 <br />0.22 31 0.06 4) 2711 6) 2711 <br />0.03 3) 0.01 4) 527 7) 527 <br />0.07 3) 0.02 4) 4000 5) 4000 <br /> 0.75 <br />Notes: 1) Mine discharge routing plan <br />2) Mean concentration, 1986 (Table A-2) <br />3) Calculated normal spoil spring flow during low flow period, 0.055 <br />gpm/acre. Derived from data in Backfill Hydrologic Evaluation, <br />Eckman Park Mines, April 1986 <br />4) Normal year flows divided by ratio of normal year to dry ,year <br />stream flow, 3.5:1 <br />5) Revision to Backfill Hydrologic Evaluation, 6/26/86 <br />6) Average salt concentration of springs above Pond A, 5/19/86 <br />7) Average salt concentration of springs at Mine 3, 5/20/86 <br />Salt Balances <br />Low flow year: ((0.33 x 660) + (0.28 x 2283) + (0.05 x 4000) + <br />(0.06 x 2711) + (0.01 x 527) + (0.02 x 4000))/0.75 = <br />1740 mg/L (164% increase) <br />Low flow, high initial dissolved solids year: ((0.33 x 1808) + <br />(0.28 x 2283) + (0.05 x 4000) + (0.06 x 2711) + (0.01 x 527) + <br />(0.02 x 4000))!0.75 = 2242 mglL (19% increase) <br />2g Revised 10/1/86 <br />