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• Table 17-2-4 <br />Computations for Irrigation Season Impact Analyses for <br />Low Flow Mine Discharges and the 07 10 San Miguel Flow <br />I. Background Salt Contributions from Upstream San Miguel, Calamity Draw and Tuttle Draw <br />6.48 cfs x 1,240 mg/1 + 5.69 cfs x 2,808 mg/1 + 0.24 cfs x 1,378 mg/1 <br />6.48 cfs + 5.69 cfs + 0.24 cfs <br />24,343.4 = 1,961.6 mg/1 <br />12.41 <br />Tonnage of Salt in San Miguel Below Tuttle Draw <br />12.41 cfs x 1,962 mg/1 x .0027 = 65.74 tons/day <br />• <br />II. During Mining Impacts to the San Miguel from Nucla and Nucla East Vi,a Tuttle and <br />Calamity Draws <br />6.48 cfs x 1,240 mg/1 + 5.69 cfs x 2,808 mg/1 + 0.69 cfs x 2,647 <br />6.48 cfs + 5.69 cfs + 0.69 cfs + 0.065 cfs <br />26,131.2 = 2,022 mg/1 <br />12.925 <br />Tonnage of Salt in San Miguel Below Tuttle Draw During Mining <br />12.925 cfs x 2,022 mg/1 x .0027 = 70.56 tons/day <br /> <br />Salinity Impacts During Mining <br />2,022 mg/1 - 1,962 mg/1 <br />x 100 = 3.14 increase in TDS <br />1,962 mg/1 <br />+ 0.065 cfs x 4.493 <br />70.56 tons/day - 65.74 tons/day <br />x100 = 7.34 increase in salt load <br />65.74 tons/day <br />