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D <br /> 40 <br /> Table 7 Effect of Maxwell Mine Discharge (180 gpm) on Stream Quality <br /> at Low Flow (5 cfs) and at Mean Flow (20 cfs) <br /> Change in Concentration, mg/l <br /> PARAMETER Low Flow Mean Flow <br /> Alkalinity (CaCo3) +30 +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 /> Manganese =0 =0 <br /> Potassium +0.25 +0.07 <br /> Sodium +20.1 +5.3 <br /> Sulfate +9 +2.3 <br /> Total Diss. Solids +47 +13 <br /> - Zinc (total ) +0.003 +0.001 <br /> C d = Qu Cu + Qm Cm <br /> Qu + Qm <br /> where <br /> Cm = concentration in mine discharge <br /> Cd = downstream concentration <br /> �? <br /> Cu <br /> = upstream concentration <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 /> 1 <br />