20. Exposure in a painting facility. All concentrations are in parts per million averaged over the specified period. Calculate the 8-hour TWA for each substance and calculate the mixture TLV (assume they cause the same health effect). Report the concentration in ppm and mg/m3. Was the worker over exposed to any 8-TWA-TLVs? Mixture 8-TWA-TLV or PEL's (Look up the TLV)? Assume NTP MW = 106g/mol for Xylene, TLV of 100) and 86.18g/mol for Hexane (TLV of 50 )