Benzene in the wastewater from a manufacturing facility is sent at rate of 2000 kg/day, to a public wastewater treatment plant, where 85% of the organic contaminant is removed before discharg ing to a local river. One hundred km downriver of the discharge point is the intake to a public drinking water treatment plant. The river flow rate is 1250 million liter per day. River velocity is 0.5 m/sec. River width is 50 m. Sediment concentration in s uspended solids=1500ppm with fraction of sediment organic carbon f oc is 0.01 . Biota concentration is 100g per 100 cubic meter. Use EPIWIN to get property data. Include summary from EPIWIN and structure of the compound in your report. When several values ar e reported for a given property, use the experimental data.

a) Estimate the fraction of benzene in water, sediment, and biota at the discharge point.

b) Determine whether volatilization of benzene from the river is likely to be significant.

c) Ignore evaporation an d compare the concentration of benz e ne in the influent of drinking water treatment with the MCL set by EPA.

d) Estimate the potential toxicity of the released benzene to aquatic life.