A. Compare a workers 8 hour (8 hour TWA) and short-term exposure limit (STEL) exposures to trichloroethylene with the 2022 ACGIH Threshold Limit Values considering that the worker spends 15 minutes where the concentration is 30 ppm, 4.75 hours at 5 ppm, and 3 hours at 7 ppm

B. Considering the information from above, assume that this same worker also has the following simultaneous exposures to methyl ethyl ketone for the work shift: 15 minutes where the concentration is 50 ppm, 4.75 hours at 80 ppm, and 3 hours at 60 ppm. Please evaluate his 8 hour and short term exposure limit (STEL) exposures to methyl ethyl ketone AND evaluate his exposure to both acetone and methyl ethyl ketone using the mixture rule approach as described in the 2022 TLVs.