The decision this case can inform
Use this record when commissioning a new plant or major upgrade and testing whether improved equipment has actually controlled worker exposure.
Two-day NIOSH survey at a newer facility. It supports the sampled total-dust finding but cannot represent every task, season, feed, or operating mode.
What the public record actually establishes
- F1
NIOSH collected 19 personal total-dust samples after the company moved into a new facility.
- F2
Five of the 19 samples exceeded the then-applicable 10 mg/m³ MSHA total-dust limit.
- F3
Respirable-dust limits were not exceeded in the survey.
- F4
Silica was not detected in the personal samples, showing that total dust remained the principal measured concern in those conditions.
Facts and reported results are kept separate from the lesson a plant may choose to test.
Operating context
NIOSH evaluated airborne dust after the company moved to a new facility.
Intervention or finding
Personal sampling distinguished total dust, respirable dust, metals, and silica and led NIOSH to identify a total-dust health hazard.
Documented result
5 of 19 total-dust samples exceeded the then MSHA 10 mg/m3 limit; respirable limits were not exceeded and silica was absent from personal samples.
Plant interpretation
Commission occupational-health controls with personal sampling; new equipment alone does not demonstrate exposure control.
Transfer boundary
Two-day survey cannot represent every task, season, or operating state.
Questions to verify at your plant
These are decision checks, not operating instructions. Resolve them through local risk assessment, technical review, and authorization.
- 01
Which exposure-control assumptions in the project business case were verified with personal sampling after startup?
- 02
Does commissioning cover routine, maintenance, upset, cleanup, and seasonal conditions?
- 03
Are total and respirable fractions interpreted separately rather than treating one compliant result as proof of overall control?
- 04
What triggers repeat sampling after process, feed, ventilation, or staffing changes?