Text For Citation: 01 Item/Group: 011 Hazard:

29 CFR 1910.1053(d)(3)(i): Scheduled monitoring option. (i) The employer shall perform initial monitoring to assess the 8-hour TWA exposure for each employee on the basis of one or more personal breathing zone air samples that reflect the exposures of employees on each shift, for each job classification, in each work area. Where several employees perform the same tasks on the same shift and in the same work area, the employer may sample a representative fraction of these employees in order to meet this requirement. In representative sampling, the employer shall sample the employee(s) who are expected to have the highest exposure to respirable crystalline silica. (a) On or about January 9, 2020, the employer had not performed initial monitoring to assess the exposure of each employee exposed to respirable crystalline silica (carcinogen). Two employees in the buffing area of the finishing department, who were sanding, buffing, and grinding on engineered marble sinks were exposed to respirable crystalline silica at a time weighted average (TWA) of 73 and 53 micrograms per cubic meter which is above the permissible exposure limit of 50 micrograms per cubic meter.