A noise dosimeter is the basis for determining total daily noise exposure for employees. However, where there is constant noise levels, the employer may estimate employee noise exposure using measurements from a sound level meter. Calculation of the employee noise exposure must be consistent with WAC 296-307-63415.

(1) The employer must include all:

(a) Workplace noise from equipment and machinery in use;

(b) Other noise from sources necessary to perform the work;

(c) Noise outside the control of the exposed employees.

(2) The employer must use a noise dosimeter when necessary to measure employee noise dose.

(3) The employer must use a sound level meter to evaluate continuous and impulse noise levels.

(4) The employer must identify all employees whose exposures equal or exceed the Noise Evaluation Criteria as follows: