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Bulldog Mine Tailings Ponds Eva[uanon <br /> <br />L_ J <br /> <br />For both the Upper and Lower Tailings Ponds, the azea covered by tailings is approximately 1/10 <br />of their respective contributing watershed areas. For water infiltrating the tailings (and seeping <br />from the tailings as leachate) at a rate of 6 inches per yeaz (from Section 4.5) and water <br />infiltrating the materials in [}ie surrounding azeas of the watershed at a rate of I.5 inches per year <br />(from Section 4.5), the dilution of tailings leachate by surrounding watershed area infiltration can <br />be calculated. For a tailings area of 1/]0 of the watershed azea, the calculated dilution of tailings <br />leachate is over 3:1. Therefore a chemical constituent in tailings leachate, assuming no <br />attenuation by site subsoils, would have a concentration of less than 1/3 of the original <br />concentration downgradient from the impoundment. <br />The combination of 40 percent infiltration in the tailings with 10 percent infiltration is <br />surrounding soils is conservative. If the infiltration in the tailings is lower or the infiltration in <br />the surrounding soils is higher, the resulting dilution would be even higher. <br />Nomesmke ,l4ining Compmm <br />p: ir-ii~ie~,ume.~~, <br />18 <br />Shrphcrd hiller. /nc. <br />.-Iprif ld. 199i <br />