Determine the mixture TLV–TWA for a worker exposed to 41ppm PCE, 38ppm TCE, 86ppm MEK, and 35ppm MIBK in air of RCRA solvent recycling operation. Are the concentrations of chemicals exceeding the...

Determine the mixture TLV–TWA for a worker exposed to 41ppm PCE, 38ppm TCE, 86ppm MEK, and 35ppm MIBK in air of RCRA solvent recycling operation. Are the concentrations of chemicals exceeding the TLV–TWA mixture?

Q42:

A groundwater plume has developed from a leaking underground storage tank and fumes have migrated to the basement of a nearby factory. A sample of the factory indoor air indicates toluene and benzene concentrations of 50 and 70 μg/m3, respectively. Determine the resulting health risk for an adult male working in the plant who is exposed to these vapors for 15years, assuming a breathing rate of 15m3/day of both toluene and benzene. The carcinogenic slope factor‐risk specific doses via the inhalation route are 0.021 (mg/kgday)−1 and 0.029 (mg/kg day)−1 for toluene and benzene. Assume the environmental risks for toluene and benzene are additive.