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e <br /> r <br /> i - t <br /> 13 <br /> 305 S. HUTCHINS STREKI, <br /> ILODt CA <br /> r-' 1 <br /> FATE AND TRANSPORT MODEL ING (CONT.) <br /> SESO L.Madel Results: <br /> Benzene reaches water table within 3:years; <br /> Concentration of benzene-in ground water increases"Ierately by a factor of 4(about <br /> 3U PPb). <br /> After year 4, concentration cif benzene in ground water starts its decline back to <br /> original.,level which is reached by year 8. <br /> Observed Ground-Water Benzene Concentrations: <br /> • :Benzene in water from W.2io downgradient of EB-8, shows no concentration trend. <br /> Concentrations have varied from 1D to 120 ppb. Moist recent 2 analyses have been <br /> NM <br /> • Concentrations of'benzene in water at MW-2 were greatest in September and <br /> December of 1995, 3 years after sail samples were taken at EB-8., This. be <br /> fortuitous. <br /> �i <br /> O <br /> IL <br /> : <br /> and:Surface Runoffl: <br /> SESUIL calculations allow for no surface runoff All,prec pkation infiltrates into the <br /> vadose zone, Some evapotranspiration is subtracted from the amount of.hfiltratiun,. <br /> but the total. amount>ofwater reaching the water table!islikely overestimated. <br /> 4 <br /> 3 <br /> i <br /> I <br /> fs' <br /> � r <br />