Question

An underground storage tank has been leaking for many years contaminating the groundwater and causing a contaminant concentration in a drinking water well is 0.282 mg/L. (a) If the contaminant is tetrachloroethylene, estimate the cancer risk of an adult who has used this public drinking water well for 10 years. Average lifetime of an adult is 70 years. Use Table 4.10 for exposure factors. (b) Do you think that city will close the well based on the risk assessment done at (a)? Assume that EPA risk standard is 10^-6 .

Answer 1