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Mixing-Calculation - Downstream from West Elk Mine <br />Calculation of dilution of alluvial water due to the doubling in width of the alluvium from approx. 500 ft. to 1000 ft. in SE 1/4 Sec. 9 - 13S-90W <br />Alluvial water immediately Alluvial water immediately TDS concentration resulting <br />downstream from widening upstream from widening from mixing at point of widening <br />E <br />Flow (cfs) <br />Scenario 1: Most likely case 1.440 <br />Scenario 2: Worst case 1.440 <br />(unlikely) <br />F G H <br /> (EXF)+(GXH) <br />TDS Flow (cfs) TDS <br />concentration concentration (E + G) <br />(mg/1) (mg/1) <br /> <br />1500 0.360 1535 1507 <br />1500 0.360 1593 1519 <br />E = 10 ft per day flow velocity X 1000 ft wide X 50 ft deep X 25% porosity <br />F is based on historical monitoring data from Bear 3 Mine alluvial well AA-1 <br />G and H are from Mass Balance Analysis at West Elk Mine spreadsheet