Question: Three benzene samples collected on a refinery worker over an 8-hour workday generated the following data: Sample A0.2 ppm for 4.0 hours Sample B 1.0

Three benzene samples collected on a refinery worker over an 8-hour workday generated the following data:

Sample A0.2 ppm for 4.0 hours

Sample B 1.0 ppm for 1.0 hours

Sample C 0.6 ppm for3.0 hours

What would be the 8-hour TWA? Was the worker overexposed considering OSHA's permissible exposure level for benzene?

Formula: TWA [ppm] = (C1T1+ C2T2+ ... + CnTn)/8

Example problem referenced below;

Three benzene samples collected on a refinery worker over an 8-hour workday

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