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Monitored hourly over an 8-hour day, the level of a solvent vapor in mg/L showed values of 0.80, 1.22, 1.06, 0.75, 1.56, 1.88, 0.91, and

Monitored hourly over an 8-hour day, the level of a solvent vapor in mg/L showed values of 0.80, 1.22, 1.06, 0.75, 1.56, 1.88, 0.91, and 1.09 mg/L. What was the TWA concentration of the vapor in mg/L?

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