Problem 4 25 points Residents of Lake City drink water that

Problem 4 (25 points) Residents of Lake City drink water that contains benzene. IfEPA requires Lake City to remove benzene from the drinking water to a level that keeps the lifetime cancer risk at or below 1 x 10, what is the maximum allowable concentration of benzene in the drinking water (in ppb)

Solution

Maximum allowable concentration of benzene in the drinking water = 1 ppb ,

it was calculated that a concentration of 1 ppb of benzene in drinking water was associated with a life time cancer risk of 10^-6 .