Washington Administrative Code
Title 296 - Labor and Industries, Department of
Chapter 296-840 - Respirable crystalline silica
Section 296-840-105 - Exposure assessment
Current through Register Vol. 24-06, March 15, 2024
This section applies to all occupational exposures except for tasks performed according to the requirements in WAC 296-840-110.
(1) Permissible exposure limit (PEL). You must ensure that no employee is exposed to an airborne concentration of respirable crystalline silica in excess of the 8-hour TWA.
(2) Exposure assessment. You must assess the exposure of each employee who is or may reasonably be expected to be exposed to respirable crystalline silica at or above the action level in accordance with either the performance option in (a) of this subsection or the scheduled monitoring option in (b) of this subsection.
(3) Reassessment of exposures. You must reassess exposures whenever a change in the production, process, control equipment, personnel, or work practices may reasonably be expected to result in new or additional exposures at or above the action level, or when the employer has any reason to believe that new or additional exposures at or above the action level have occurred.
(4) Methods of sample analysis. You must ensure that all samples taken to satisfy the monitoring requirements of subsection (2) of this section are evaluated by a laboratory that analyzes air samples for respirable crystalline silica in accordance with the procedures in WAC 296-840-165 Appendix AMethods of sample analysis of this chapter.
(5) Employee notification of assessment results.
(6) Observation of monitoring.