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• <br />Table 17-19 <br />Combined Effect of Mine Discharges into Calamity and <br />Tuttle Draw on the San Miguel Water Quality <br />I. Combined Premine to San Miguel <br />522 + 51 + 3.1 <br />(696 + 16.7 + 1.88) x .00136 <br />(351 + ,95 + 8.4) x 593 x .0027 = 577 tons/day <br />11. Combined postmine to San Miguel <br />577 + 12.2 + 7,9 <br />= 576.1 = 593 mg/1 <br />.972 <br />+ 597 = 611 mg/1 <br />(1.94 + 2.06 + 775) x .00136 .978 <br />L <br /> <br />611 - 593 18 mg/1 , 18 = 3 percent increase in TDS <br />593 <br />17-69 <br />Revised 04/11/88 <br />