You are hired to perform industrial hygiene sampling at an automotive painting facility. Several workers at the facility have experienced headaches and dizziness while stripping paints. You suspect Methylene Chloride (Dichloromethane) exposures may be the cause. After sampling one employee you determine the levels are as follows: 55 ppm for 4 hours 3 ppm for 1 hour (lunch and breaks) 42 ppm for 3 hours 1. What is the TWA of Methylene Chloride exposure of the employee sampled? 2. Is the exposure acceptable, above or below the PEL and TLV? 3. You have to explain your findings to the facility manager. What is the role of OSHA and ACGIH in setting OELs? 4. What is your recommendation to the facility manager?