WAC 296-817-30015. Use these equations when estimating full-day noise exposure from sound level measurements

You must compute employee's full-day noise exposure by using the appropriate equations from Table 2 "Noise Dose Computation" when using a sound level meter to estimate noise dose. Table 2 Noise Dose Computation Description Equation Compute the noise dose based on several time periods of constant noise during the shift. The total noise dose over the work day, as a percentage, is given by the following equation where C n indicates the total time of exposure at a specific noise level, and T n indicates the reference duration for that level. D = 100*((C 1 /T 1 ) + (C 2 /T 2 ) + (C 3 /T 3 ) + ... + (C n /T n )) The reference duration is equal to the amount of time of exposure to continuous noise at a specific sound level that will result in a one hundred percent dose. The reference duration, T, for sound level, L, is given in hours by the equation: T = 8/(2^((L - 90)/5)) Given a noise dose as a percentage, compute the equivalent eight hour time weighted average noise level. The equivalent eight-hour time weighted average, TWA 8 , is computed from the dose, D, by the equation: TWA 8 = 16.61* Log 10 (D/100) + 90 Description Equation Compute the noise dose based on several time periods of constant noise during the shift. The total noise dose over the work day, as a percentage, is given by the following equation where C n indicates the total time of exposure at a specific noise level, and T n indicates the reference duration for that level. D = 100*((C 1 /T 1 ) + (C 2 /T 2 ) + (C 3 /T 3 ) + ... + (C n /T n )) The reference duration is equal to the amount of time of exposure to continuous noise at a specific sound level that will result in a one hundred percent dose. The reference duration, T, for sound level, L, is given in hours by the equation: T = 8/(2^((L - 90)/5)) Given a noise dose as a percentage, compute the equivalent eight hour time weighted average noise level. The equivalent eight-hour time weighted average, TWA 8 , is computed from the dose, D, by the equation: TWA 8 = 16.61* Log 10 (D/100) + 90