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Table 17-2-4 <br /> Computations for Irrigation Season Impact Analyses for <br /> Low Flow Mine Discharges and the Q7-10 San Miguel Flow <br /> 9. Background Salt Contributions from Upstream San Miguel, Calamity Draw and Tuttle Draw <br /> 6.48 cfs x 1,240 mg/l + 5.69 cfs x 2,808 mg/1 + 0.24 cfs x 1,378 mg/l <br /> 6.48 cfs + 5.69 cfs + 0.24 cfs <br /> 24,343.4 = 1,961.6 mg/l <br /> 12.41 <br /> Tonnage of Salt in San Miguel Below Tuttle Draw <br /> 12.41 cfs x 1,962 mg/l x .0027 = 65.74 tons/day <br /> If. During Mining Impacts to the San Miguel from Nucla and Nucla East Via Tuttle and <br /> Calamity Draws <br /> 6.48 cfs x 1,240 mg/l + 5.69 cfs x 2,808 mg/l + 0.69 cfs x 2,647 mg/l + 0.065 cfs x 4,493 mg/l <br /> 6.48 cfs + 5.69 cfs + 0.69 cfs + 0.065 cfs <br /> 26,131.2 = 2,022 mg/l <br /> 12.925 <br /> Tonnage of Salt in San Miguel Below Tuttle Draw During Mining <br /> 12.925 cfs x 2,022 mg/l x .0027 = 70.56 tons/day <br /> Salinity Impacts During Mining <br /> 2,022 mg/l - 1,962 mg/1 <br /> x 100 = 3.1% increase in TDS <br /> 1,962 mg/l <br /> 70.56 tons/day - 65.74 tons/day <br /> x100 = 7.3% increase in salt load <br /> 65.74 tons/day <br />