Three workers (8-hour work shift) were monitored for work in different areas of a facility using calibrated noise dosimeters. The results are summarized in the following table.

Time for Monitoring	Worker 1	Worker 2	Worker 3
3 hours	80.5 dBA	98.5 dBA	92.5 dBA
2 hours	81.0 dBA	86.5 dBA	85.0 dBA
2 hours	82.0 dBA	84.5 dBA	83.5 dBA
1 hour	95.0 dBA	83.5 dBA	80.0 dBA

a. Calculate the 8-hour time-weighted average (TWA) noise exposure for each of the three workers.

b. Summarize which (one) of the exposures exceeds OSHA's permissible exposure limit (PEL) and/or action level for noise.

c. Discuss what factors about the noise monitoring may have affected the accuracy of the noise measurements. Show your work for all mathematical calculations. Please refer to Appendix A to 29 CFR 1910.95 for assistance on how-to solve this problem. Your response must be at least 200 words in length.