The following data is for exposure to benzene in drinking water:

Consumption of 2 L/day, 350 days/year for 70 years

Cancer Slope Factor (CSForal) = 3 x 102 (mg/kg-day)I

A. Assume an acceptable cancer risk of 25 10 to estimate an appropriate drinking water standard (mg/L) for benzene, assuming 70 kg body weight and 70 year life span

B. Briefly explain how determination of the CSF values for carcinogens is very conservative