(4 marks) Now imagine two different workers, Simon and Fraser, who are employed
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(4 marks) Now imagine two different workers, Simon and Fraser, who are employed at a factory in BC that makes hockey pucks. The factory operates 12 hours per day, from 6:00 am to 6:00 pm. There are three machines used in the factory. The noise level in the factory varies depending on which machine is operating. Machine #1 operates 6:00 am to 10:00 am, and during this time workers are exposed to 85 dBA. Machine #2 operates 10:00 am to 4:00 pm, and during this time workers are exposed to 91 dBA. . · Machine #3 operates 4:00 pm to 6:00 pm, and during this time workers are exposed to 88 dBA. Simon and Fraser both work eight-hour shifts. Simon works from 6:00 am to 2:00 pm. Fraser works from 10:00 am to 6:00 pm. Assuming a maximum permitted exposure level for 8 hours of 85 dBA with a 3 dBA exchange rate, are these workers exposed above the noise exposure limit during their 8-hour work shifts? Please clearly show how you arrived at your answer.Explanation / Answer
According to the information, the total working hours and the amount of noise to working hours per day for each worker can be calculated as:
Machine 1: 85 dBA/4 hours or 21.25 dBA/hour. This gives a total of 21.25*8 or 170 dBA in 8 hours.
Machine 2: 91 dBA/6 hours or 15.17 dBA/hour. This gives a total of 15.17*8 or 121.33 dBA in 8 hours.
Machine 3: 88 dBA/2 hours or 44 dBA/hour. This gives a total of 44*8 or 352 dBA in 8 hours.
Since all of these noise limits are much higher than the recommended maximum permitter exposure level for 8 hours i.e. 85 dBA, this suggests that these workers are exposed to noise levels higher than normal.
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