Visual examination and sampling are used to evaluated the effectiveness
of decontamination procedures, in compliance with 29 CFR 1910.120(k)(2)(iv).
Visual examination is used to ensure that procedures are implemented as described
and that they appear to control the spread of contaminants under changing site
conditions. Visual examination is also used to inspect for signs
of residual contamination or for contaminant permeation of PPE.
Sampling, both air sampling and surface sampling, are used to
verify the effectiveness of decontamination. Air samples are taken
in the clean zone to ensure that airborne contaminants have not spread
to clean areas of the site. Surface
samples are taken from the inside surfaces of PPE, from decontaminated
heavy equipment, and from surfaces within clean areas of the site to
ensure that site decontamination and control procedures are performing
as anticipated. The
type and frequency of air and surface sampling used to ensure the effectiveness
of decontamination procedures are determined by the Incident Safety Officer
(see HASP Section 7- Monitoring), based on the contaminate, the concentrations
and the sampling methods available. If site procedures are changed
as a result of inspection and monitoring, all affected employees are
notified of these changes.
As an example, the Commonwealth of Massachusetts’, Department
of Fire Services Decontamination Standard Operating Guideline is provided