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<br />40 <br />• <br />Table 7 Effect of Maxwell Mine Discharge (180 gpm) on Stream Quality <br />f at Low Flow (5 cfs) and at t4ean Flow (20 cfs) <br /> Change in Concentration, mq/1 <br />PARAMETER Low Flow Mean Flow <br />Alkalinity (CaCo3) +:i0 +8 <br />Bicarbonate +36 +10 <br />Boron +0.005 +0.001 <br />Calcium -2.0 -0.5 <br />Chloride +0.36 +0.10 <br />~ Fluoride +0.08 +0.02 <br />' Iron (total) -0.03 -0.01 <br />Magnesium -0.3 -0.1 <br />1 Manganese =0 =0 <br />Potassium +0.25 +0.07 <br />Sodium +20.1 +5.3 <br />Sulfate +9 +2.3 . <br />Tdtal Diss. Solids +47 +13 <br />Zinc (total) +0.003 ±0.001 <br />l <br />I C = Qu Cu + Qm Cm <br />d <br />+ Q <br />Q <br />u <br />m <br />where <br />~ C <br />= concentration in mine discharge <br />m <br />Cd = downstream concentration <br />C <br />= upstream concentration <br />u <br />Qu = upstream river discharge <br />Qm = mine discharge <br />was used to estimate the downstream concentrations. <br />This model is based on dilution and does not take account of chemical <br />reactions that might occur. The indicated computation was made for <br />each of the parameters listed in Table 7 and the change was computed <br />by subtracting Cu. . <br />