1. What is the daily dose, expressed as a percentage, for a worker who operates a lathe 1for .5 hours per day, set his lathe up for 4.5 hours per day, performs administrative tasks for 1 hour per day, and spends the balance of his 8-hour workday either at breaks or eating lunch? Use the data below and calculate the dose using the OSHA PEL.

   Time (hr)	SPL (dBA)
   Operating the lathe	95
   Setting up the lathe	90
   Breaks and lunch	84
   Administrative tasks	82

   		120%
   		107%
   		94%
   		74%

2. Calculate the TWA.

		89.5 dBA
		87.3 dBA
		86.2 dBA
		93.7 dBA