2. Calculate whether the following scenarios exceed any of the OSHA exposure limits. Determine the 8-hour TWA and identify the exposure limit in your answer.

a. 4 hours of 2 fibers/cc asbestos exposure and 4 hours of 0.5 f/cc asbestos exposure

b. 2 hours 50 ppm toluene exposure, 4 hours of 120 ppm toluene exposure, and 2 hours of 100 ppm toluene exposure

c. 8 hours of exposure to both 25 ppm methylene chloride and 50 ppm trichloroethylene

d. 8 hours of exposure to 40 ppm ethyl benzene, 40 ppm xylene, 40 ppm n-hexane, and 5 mg/m3 calcium sulfate

e. 1 hour of exposure to 50 ppm MEK, 5 hours of exposure to 200 MEK, 2 hours of exposure to 100 pm MEK

f. 8 hours exposure to both 2 ug/m3 cadmium and 35 ug/m3 lead