Drilling, Anchoring, and Demolition
Table 1 - SPECIFIED EXPOSURE CONTROL METHODS WHEN WORKING WITH MATERIALS CONTAINING CRYSTALLINE SILICA
| Required Respiratory Protection and Minimum Assigned Protection Factor (AFP) | |||
|---|---|---|---|
| Equipment/Task | Engineering and Work Practice Control Methods | ≤ 4 hours/shift | > 4 hours/shift |
| Handheld and Stand-Mounted Drills (including Impact and Rotary Hammer Drills) | Use drill equipped with commercially available shroud or cowling with dust collection system. Operate and maintain tool in accordance with manufacturer's instructions to minimize dust emissions. Dust collector must provide the air flow recommended by the tool manufacturer, or grater, and have a filter with 99% or greater efficientcy and a filter-cleaning mechanism. Use a HEPA-filtered vacuum when cleaning holes. | None | None |
| Jackhammers and Handheld Powered Chipping Tools | Use tool equipped with commercially available shroud and dust collection system. Operate and maintain tool in accordance with manufacturer's instructions to minimize dust emissions. Dust collector must provide the air flow recommended by the tool manufacturer, or greater, and have a filter with 99% or greater efficiency and a filter-cleaning mechanism. | ||
| When used outdoors | None | APF 10 | |
| When used indoors or in an enclosed area | APF 10 | APF 10 | |