Question

A 70-kg individual drinks 2 L/day of water containing 0.015 mg/L of tetrachloroethylene for 20 years. (a) Find the hazard quotient for this exposure. (b) Find the cancer risk. (c) If the individual drinks this water for 30 years instead of just 20, recomputed the hazard quotient and the cancer risk. A man works in an Aluminum smelter for 10 years. The drinking water in the smelter contains 0.015 mg/L arsenic and 0.80 mg/L methylene chloride. His only exposure to these chemicals in water is at work. (a) What is the hazard index (HI) associated with this exposure? (b) Does the HI indicate this is a safe level of exposure? (c) What is the incremental lifetime cancer risk for the man due solely to the water he drinks at work and does it seem to be an acceptable risk according to EPA? Find the acceptable concentration of chloroform in air (mg/m^3), at a lifetime acceptable risk of 1 x 10^-6. Use the EPA exposure factors.

Answer 1

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