Control Verification, Monitoring, and Program Evaluation
Control Verification, Monitoring, and Program Evaluation
This domain tests whether controls actually work after installation and over time. Verification is not a one-time inspection; it includes exposure monitoring, ventilation checks, maintenance, recordkeeping, and program review.
Core rules
- Verify controls before relying on them: visual inspection, smoke tubes, airflow measurement, and personal exposure sampling against OSHA PELs or NIOSH RELs.
- Use representative sampling: the highest-exposure workers, tasks, and shifts. A single sample cannot prove a program works.
- Calibrate sampling pumps and direct-reading instruments; document calibration, sampling time, and analytical method.
- Monitor control performance: hood static pressure, filter changeout, fan belts, duct condition, and maintenance logs.
- Evaluate the program with audits, incident and near-miss reviews, medical surveillance results, training records, and corrective actions. Keep records as required; 1910.1020 provides employee access to exposure and medical records.
Worked example
After installing LEV on a mixing tank, personal sampling shows 0.03 mg/m³ for a contaminant with a PEL of 0.05 mg/m³. That is below the PEL, but do not stop there. Verify hood capture with smoke, check duct transport velocity, confirm make-up air, and repeat sampling after process changes. If the margin is small, add periodic monitoring and maintenance triggers.
Traps
- Treating one compliant sample as proof of control.
- Measuring airflow once and never checking filters, belts, or dampers.
- Ignoring changes in process, chemical, or production rate.
- Failing to close corrective actions or track them to completion.