1. Please solve the following problem, indicating your response on a Word document and submitting the document via File Upload.

   Using the following formula, solve the problem below, and show your work.

   TWA=CaTa+CbTb+ ... +CnTn 8

   TWA	=	Time-Weighted Average
   Ca	=	Concentration of contaminant during the sampling period "a"
   Ta	=	Time of sampling period "a"
   Cb	=	Concentration of contaminant during the sampling period "b"
   Tb	=	Time of sampling period "b"
   Cn	=	Concentration of contaminant during the sampling period "n", where "n" is the last of a series of contaminants
   Tn	=	Time of sampling period "n"

   Note: All concentrations are in parts contaminant per million parts of air or milligrams of contaminant per cubic meter of air. Air Sampling Problem:You are an industrial hygienist that is conducting personal sampling on a worker who is overseeing a production process involving use of toluene (Note: The Occupational Safety and Health Administration has established a Permissible Exposure Limit of 200 parts per million (ppm)). You are able to measure the following exposures:

   500 ppm for 1 hour 100 ppm for 4 hours 225 ppm for 3 hours What is the calculated TWA? What would you tell plant management in terms of exposure to toluene and compliance with the PEL?

   1. Attach File