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20-03-2024
Engineering

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What is this worker’s TWA exposure to Methylene chloride, given the following measurements: 4 hours at 15 ppm, 3 hours at 1 ppm, 30 minutes at 130 ppm, 30 minutes lunch break – assumed zero?
a) 35 ppm
b) 50 ppm
c) 45 ppm
d) 40 ppm

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