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I• 40 ' <br />I ~ <br />Table 7 Effect of Maxwell Mine Discharge (180 gpm) on Stream Quality J <br />1i at Law Flow (5 cfs) and at Mean flow (20 cfs) <br /> Change in Concentration, mq/'I <br /> PARAMETER Low Flow Mean Flow <br /> Alkalinity (CaCo3) +30 +8 <br />l Bicarbonate +36 +10 <br /> Boron +0.005 +0.001 <br />1 <br />ll Calcium -2.0 -0.5 <br />1 Chloride +0.36 +0.10 <br />J, Fluoride +0.08 +0.02 <br /> Iron (total) -0.03 -0.01 <br />~ Magnesium -0.3 -0.1 <br />7 Manganese ~0 :0 <br /> Potassiiaa +0.25 +0.07 <br /> Sodium <br />. +20.1 +5.3 <br /> y <br /> Sulfate +g +p,3 <br /> Total Diss. Solids +47 +13 •. <br /> Zinc (total) +0.003 .+0.001 <br />1 i. Cd , Qu Cu + Qm Cm <br />- <br />1 ~~ <br />where <br />I~ Cm concentration in mine discharge <br />Cd ~ downstream concentration <br />Cu = upstream concentration <br />I; <br />Qu ~ upstream river discharge <br />,. Qm ~ mine discharge <br />.+as 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 competed <br />by subtracting Cu. <br />~ ~. <br />