I need to assess a worker exposure (silica, noise)
Quantify the exposure and pick controls: silica 8-hour TWA, the right Table 1 control, the noise dose, and the PPE for what's left.
Why this workflow
An exposure problem is a measurement problem first: you can't pick the right control or PPE until you know the dose relative to the limit. This workflow quantifies silica and noise against their PELs and action levels, then selects controls and PPE for whatever exposure is left.
Run these tools in order
Each step opens a free tool. Work top to bottom for a clear outcome.
When you’re done, you’ll have
- Silica 8-hour TWA calculated vs the PEL (50 µg/m³)
- Table 1 control method selected for the task
- Noise dose / 8-hour TWA checked vs the 90 dBA PEL and 85 dBA action level
- PPE selected for the remaining hazards
Frequently asked questions
Do I have to monitor, or can I just use Table 1?
For listed silica tasks, fully implementing Table 1's specified controls lets you skip exposure assessment for those tasks. Off-table tasks require the performance option — air monitoring against the PEL and action level.
What triggers a hearing conservation program?
An 8-hour noise TWA at or above 85 dBA (the action level): monitoring, hearing protectors, annual audiograms, and training are then required, even though the PEL itself is 90 dBA.
Controls help but don't get below the limit — now what?
Follow the hierarchy: engineering and work-practice controls first, and where they aren't sufficient, respiratory protection or PPE under a proper program. PPE is the last layer, not the first.
Planning aid only — not legal advice. Confirm every determination against the current OSHA standard and your State-Plan's rules.
Keep exposure assessments and controls on file
HazComFast keeps your exposure records and the controls you chose organized for the next review.
Try HazComFast freeGet the Binder in Order Before the Inspector Arrives. Are You Ready?
OSHA does not give advance notice of inspections (29 CFR 1903.6). Get the binder in order before the opening conference, not during it.
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