Hazardous Noise Case Study
You have been hired as a consultant to help a local machine shop solve a hazardous noise problem. The shop is 10,000
square feet in area, with 12-foot high concrete block walls, and a flat metal roof. Inside the shop are two band saws, two
metal lathes, three drill presses, one milling machine, and three abrasive grinders. The six employees work at benches
located throughout the shop, using a variety of pneumatic-powered hand tools and non-powered tools. A recent noise
survey found sound pressure levels exceeding 100dBA in some parts of the shop. All employees were monitored for noise
exposure over an eight-hour workday, and the calculated TWA for noise for the employees ranged from 88dBA to 97dBA.
Using the Risk Assessment Matrix in Table 11 on page 122 of the course textbook, conduct an initial hazard analysis and
risk assessment based on the information in the scenario provided. Discuss how you arrived at the risk level estimate.
Determine a possible control measure for each of the six levels in the hierarchy of controls on page 208 in the course
textbook, and explain the reasoning behind each choice. For each of the selected control measures, reevaluate the
original risk. In a summary paragraph, discuss the results and how the shop managers could determine which control
measures would be required and which others might be beneficial to their operations.
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