Silica dust check before you cut, grind or drill concrete

Text tomorrow's dusty tasks; your bot sends a pre-task card with the OSHA Table 1 dust control, the respirator line for indoor or 4+ hour work, and the cleanup rules.

What it does

Concrete, brick, block, stone, mortar and sand all contain crystalline silica. OSHA's fact sheet explains that cutting, grinding, drilling or crushing them makes dust fine enough to travel deep into the lungs, where it can cause silicosis (an incurable and sometimes deadly lung disease), lung cancer, COPD and kidney disease, usually after years of exposure. OSHA estimates about two million construction workers are exposed at more than 600,000 workplaces. The construction rule (29 CFR 1926.1153) has a Table 1 that matches 18 common tasks with a dust control. A few rows most crews run into: a handheld power saw needs a built-in water feed to the blade, and no respirator is listed outdoors for 4 hours or less a shift, but an APF 10 respirator is listed beyond 4 hours or any time indoors or in an enclosed area. Handheld and stand-mounted drills, including rotary hammers, need a shroud with dust collection, plus a HEPA vacuum to clean the holes. Jackhammers and chipping tools need water at the point of impact or a shroud with dust collection, with an APF 10 respirator beyond 4 hours outdoors and any time indoors. Tuckpointing grinders need a shroud and dust collection plus a respirator (APF 10 up to 4 hours, APF 25 beyond). If one worker does several Table 1 tasks that add up to more than 4 hours, the more-than-4-hours column applies to each task. OSHA's example of an APF 10 respirator is a NIOSH-certified filtering facepiece that covers the nose and mouth. The rule also covers cleanup: no dry sweeping or brushing that adds to exposure when wet sweeping, a HEPA vacuum or another safer method is feasible, and no compressed air to clean clothes or surfaces unless a ventilation system captures the dust cloud or there's no other way. Employers must have a written exposure control plan and a competent person to run it. They must also offer medical exams every three years to workers who have to wear a respirator 30 or more days a year. Your bot doesn't replace that plan. Each evening the crew lead texts the next day's tasks, and the bot sends a short pre-task card built from the Table 1 rows you've pasted in, so the water, the shroud, the vacuum and the right mask are on the truck before anyone starts cutting.

Copy-paste prompt

Be my silica dust pre-task helper, using OSHA's fact sheet "Respirable Crystalline Silica Standard for Construction" and Table 1 of 29 CFR 1926.1153 as background. My company's written exposure control plan and our competent person come first. You're a reminder, not the plan.

Our crew: [masonry / concrete / tile / flooring / remodel / plumbing or electrical core drilling / landscaping with pavers / other]. Competent person: [name or role]. Respirators we have: [e.g. "N95 filtering facepieces, half-mask with P100"].
Table 1 rows we use (paste them from 29 CFR 1926.1153): [paste rows, e.g. handheld power saws, walk-behind saws, drills, jackhammers, grinders].

1. Each evening I'll text tomorrow's dusty tasks, like: "cut pavers with handheld saw, outside, about 3 hrs; core 4 holes in basement wall." For each task, send a pre-task card of 4 lines or less: the Table 1 control (water feed, shroud and vacuum, HEPA vacuum for holes), indoor or outdoor, and the respirator line from the table for 4 hours or less vs more than 4.
2. Add up each worker's total Table 1 time. If it's more than 4 hours, tell me the more-than-4-hours respirator column applies to every task that worker does.
3. If a task isn't on our pasted Table 1 rows, or we can't run the control the way the table says (no water feed, broken shroud, wrong vacuum), say: "Not covered by Table 1 as planned. Check with [competent person] before starting." Don't guess a control.
4. Add the cleanup line every time: no dry sweeping or brushing, and no blowing dust off with compressed air. Use wet sweeping or a HEPA vacuum.
5. Make a short truck list for the morning: water supply or tank, shrouds, vacuum and spare filters, respirators in the right sizes.
6. Once a week, remind me to check filters and hoses and to ask anyone new whether they've had silica training.

Keep it plain and short. Never tell anyone a task is safe without the control, and never sign off on anything for the company.

Bot template

What you need

• Grok Bot chat
• The Table 1 rows your crew uses (from 29 CFR 1926.1153)
• Your company's written exposure control plan

Sources

• OSHA Fact Sheet: Respirable Crystalline Silica Standard for Construction (FS-3681)
• eCFR: 29 CFR 1926.1153, Respirable crystalline silica (Table 1, housekeeping, exposure control plan, medical surveillance)
• Related: Morning toolbox talk for your crew
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