Current through Register Vol. 48, No. 12, March 22, 2024
a) A remote worker or equipment
decontamination enclosure system may be used when the asbestos abatement work
occurring in a contained area in a school is restricted to the removal of
nonfriable ACBM by a method which does not cause the ACBM to become friable, or
removal of thermal system insulation by use of a glovebag technique.
b) Worker access to and from a contained area
must be through an airlock.
c) If a
worker decontamination enclosure system attached to a contained area is to be
used as a remote decontamination enclosure system for work conducted in other
contained areas, access to the worker decontamination enclosure system
consisting of one of the following methods may be provided, and shall be
provided when it is not feasible for the equipment decontamination enclosure
system to be used for this purpose:
1) An
airlock attached to the equipment room of the decontamination enclosure
system.
2) A two-stage airlock,
consisting of two airlocks in series, which provides access directly to the
contained area connected to the worker decontamination enclosure
system.
3) If only nonfriable
removal or removal by a glovebag technique is to be conducted in the
contaminated area having the attached worker decontamination enclosure system,
an airlock attached to the contained area.
d) Setup of the remote decontamination
enclosure system shall be in accordance with Section
855.410.
e) The remote decontamination enclosure
system shall be located inside the separation barriers and shall be in
accordance with Section
855.430(b).
f) The following procedures shall be used
with a remote decontamination enclosure system:
1) Licensed asbestos workers shall don
respiratory protection and two pairs of protective coveralls prior to entering
the contained removal area.
2)
After completion of the removal and cleaning, the worker shall HEPA vacuum the
outer suit, enter the airlock, remove the outer suit and dispose of it as
asbestos-contaminated waste.
3)
Still wearing the inner suit and respiratory protection, the worker shall
either proceed to another containment, don a second suit and enter, or proceed
to the remote decontamination enclosure system.
4) The remote decontamination enclosure
system shall consist of a five chamber unit as illustrated in Section
855.Appendix A, Illustration D.
5)
A HEPA filtered negative air pressure unit shall be attached to the remote
decontamination enclosure system at the equipment room end. The negative air
unit shall be exhausted to the exterior of the building and shall operate in
accordance with Section
855.380.
6) The remote decontamination enclosure
system shall be wet cleaned after the completion of abatement and have a 12
hour settling period prior to the collection of air samples.
7) One aggressive air sample shall be taken
in the equipment room and analyzed by phase contrast microscopy (PCM) for
clearance following USEPA Asbestos Hazard Emergency Response Act (AHERA)
clearance standards. If the decontamination enclosure system does not meet
clearance requirements, then the above mentioned procedure shall be repeated
until clearance is obtained.
