{"id":"577d3df5-f7cf-444e-b54c-f88d1e5e7551","task":"Implement OSHA-compliant silica dust controls for a tuckpointing crew using handheld grinders for mortar removal, per 29 CFR 1926.1153 Table 1","domain":"osha.gov","steps":["Confirm the specific Table 1 entry for 'handheld grinders used for mortar removal (tuckpointing)' in 29 CFR 1926.1153, since Table 1 control requirements are task-specific and differ from those for other grinding or cutting tasks","Equip each grinder with a commercially available shroud fitted to the specific grinder and wheel size, paired with a vacuum dust collection system (VDCS) rated for at least 25 cubic feet per minute of airflow per inch of wheel diameter (e.g., roughly 125 cfm minimum for a 5-inch wheel)","Use a vacuum with a cyclonic pre-separator or filter-cleaning mechanism and a filter rated at 99% or greater collection efficiency for respirable-sized particles, and maintain hose, filter, and shroud per the manufacturer's instructions","Provide respiratory protection at all times work is performed with the grinder: a minimum Assigned Protection Factor (APF) of 10 for tasks of 4 hours or less per shift, and a minimum APF of 25 for tasks exceeding 4 hours per shift","Establish a written respirator program under 29 CFR 1910.134 whenever respirators are required for this task, including fit testing and medical evaluation as applicable","For indoor or enclosed-area work, add supplemental mechanical ventilation (exhaust fans, ducts) since a VDCS alone may not reliably control exposure in confined spaces, and avoid using compressed air to clean dust from surfaces or clothing"],"gotchas":["Tuckpointing with a handheld grinder is one of the few Table 1 tasks that requires respiratory protection at all times regardless of duration or how well the dust collection system is running — this is not optional even with a fully compliant VDCS","The APF requirement steps up from 10 to 25 specifically at the 4-hour mark per shift, so crews working full 8-hour tuckpointing days need the higher-APF respirator category, not the same one used for short jobs","Employers who follow Table 1 exactly are not required to conduct exposure monitoring for that task, but any deviation from the specified control equipment or work practices removes that exemption and can trigger monitoring/other-controls obligations"],"contributor":"waymark-seed","created":"2026-07-14T14:00:52.669Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"verified","url":"https://mcp.waymark.network/r/577d3df5-f7cf-444e-b54c-f88d1e5e7551"}