The formula for TWA is TWA 1661 log10 D100 90 For worker 1 805 dBA 81 dBA 279

# The formula for twa is twa 1661 log10 d100 90 for

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The formula for TWA is : TWA = 16.61 log(10) (D/100) + 90 For worker 1: 80.5 dBA = 81 dBA = 27.9 81 dBA = 81 dBA = 27.9 82.0 dBA = 24.3 95.0 dBA = 4 D = 100 ( 3/27.9 + 2/27.9 + 2/24.3 + ¼) D = 100 (0.1075 + 0.0717 + 0.0823 + 0.25) D = 100 ( 0.5115) D = 51.15 or 51% TWA = 16.61 log(10)(D/100) +90 TWA = 16.61 log(10)(51/100) +90 TWA = 85.1 dBA For Worker 2 : 98.5 dBA = 99 dBA = 2.3 86.5 dBA = 87dBA = 12.1 84.5 dBA = 85 dBA = 16 83.5 dBA = 84 dBA = 18.4

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D= 100 (3/2.3 + 2/12.1 + 2/16 + 1/18.4) D= 100( 1.3043 + 0.1653 + 0.125 + 0.0543) D = 100(1.6489) D= 164.89 or 164.89% TWA = 16.61 log(10)(D/100) +90 TWA = 16.61 log(10)(164.89/100) + 90 TWA = 93.6 dBA For worker 3 : 92.5 dBA = 93 dBA = 5.3 85.0 dBA = 85 dBA = 16 83.5 dBA = 84dBA = 18.4 80.0 dBA = 80 dBA = 32 D = 100 (3/5.3 + 2/16 + 2/18.4 + 1/32) D = 100 (0.5660 + 0.125 + 0.1087 + 0.0312) D= 100 (0.8309) D = 83.09 or 83.09% TWA = 16.61 log(10)(D/100) +90 TWA = 16.61 log(10)(83.09/100) + 90 TWA = 88.6 dBA For part b we must summarize which ( one ) of the exposures exceeds OSHA's permissible exposure limit (PEL) and/or action level for noise. After the calculations have been finished for the three employees, it is seen that workers 1 and 3 fall within the OSHA PEL (between 85 and 90), so by 29 CFR 1910.195(c)(1), the employer shall administer a continuing, effective hearing conservation program, as described in paragraphs (c) through (o) of this section, whenever employee noise exposures equal or exceed an 8-hour time-weighted average sound level (TWA) of 85 decibels measured on the A scale (slow response) or, equivalently, a dose of fifty percent (OSHA, 2008). Worker 2 however falls outside of the OSHA PEL with a TWA of 93.6 dBA. For this worker, the controls of the job should be altered to help lower the noise exposure. If that is not a possibility, the employer must furnish the employee with a higher level of PPE that will protect them from the higher dBA’s. For part c we must discuss what factors about the noise monitoring may have affected the accuracy of the noise measurements. Some factors that could alter these measurements include : background noise, humidity/temperature of the area during measurement, and distance from the noise source during measurement.
Occupational Safety and Health Administration. (2008, December 12). Occupational Noise Exposure. Retrieved from - regs/regulations/standardnumber/1910/1910.95 Occupational Safety and Health Administration. ( n.d.) Occupational Health and Environmental Controls, 1910.95 App A , Retrieved from - regs/regulations/standardnumber/1910/1910.95AppA
• Spring '14
• Bullock
• Occupational safety and health, Occupational Safety and Health Administration, Permissible exposure limit

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