Current through Register Vol. 49, No. 13, September 23, 2024
Subpart 1.
Postabatement cleaning.
After asbestos-containing material has been removed,
encapsulated, or enclosed, interior surfaces of the containment and interior
surfaces of the decontamination unit must be cleaned.
A. HEPA-filter equipped vacuuming, wet
wiping, or both, must be used.
B.
Cleaning must be performed until no asbestos dust, residue, dirt, or debris is
visible on any part of the work area.
C. All liquid waste must be cleaned up and
disposed of as described in subpart 9.
D. All abatement equipment must be cleaned
and all equipment except the HEPA-filter equipped negative air machine must be
removed from the containment.
E.
Asbestos contaminated equipment that cannot be cleaned must be sealed in two
layers of six-mil polyethylene before removal from the containment.
F. Asbestos-containing material which was
removed must be taken out of the containment.
Subp. 2.
Visual inspection of
containment after postabatement cleaning.
A visual inspection of the containment and the
decontamination unit must be performed after the containment and
decontamination unit have dried completely.
A. Any residue observed in the containment or
decontamination unit must be considered to be asbestos.
B. The sequence of cleaning and inspection
must be repeated until the area passes a visual inspection.
C. The inspection must establish completeness
of removal, encapsulation, enclosure, and cleanup.
(1) Surfaces must be wiped using a dark damp
cloth to collect the dust, debris, and residue from surfaces.
(2) The cloth must be inspected for evidence
of dust.
(3) After the final
inspection, residue, dust, dirt, or debris must not be visually detectable on
any part of the work area, including floors, walls, ducts, conduits, pipes, and
ceiling tile grid bars, as well as the asbestos abatement equipment.
Subp. 3.
Removal
of containment walls and floors.
After the postabatement visual inspection, removal of the
walls and floors must occur in the order specified in items A and B.
A. When porous surfaces inside the
containment have not been covered according to part 4620.3568, encapsulant must
be used on those porous surfaces to securely seal down any residual fibers.
(1) The encapsulant must be applied after the
containment has passed the visual inspection required under subpart
2.
(2) The encapsulation must
comply with part 4620.3572.
(3) The
encapsulant must be allowed to dry completely before final clearance air
samples are taken according to part 4620.3594.
B. The walls and floors of the containment
may be removed only after:
(1) the containment
and the decontamination unit have passed the visual inspection specified in
subpart 2; and
(2) any encapsulant
that has been applied is completely dry.
Subp. 4.
Visual inspection after
removal of containment walls and floors.
Following removal of the walls and floors of the containment,
all surfaces previously in contact with the walls and floors of the containment
and the interior decontamination unit must be inspected.
A. The inspection must be done according to
subpart 2.
B. Whenever
contamination is observed, the entire area must be cleaned, using a HEPA-filter
equipped vacuum, wet wiping, or both, until no contamination is
visible.
Subp. 5.
Completion of clearance air sampling.
Clearance air sampling must be performed and samples analyzed
according to part 4620.3596, 4620.3597, or 4620.3598, before removal of
critical barriers and the decontamination unit.
Subp. 6.
Removal of critical
barriers.
Critical barriers must be:
A. removed after the containment and the
decontamination unit have passed the visual inspection specified in subpart 4
and completion of clearance air sampling as specified in subpart 5;
B. removed after the contracting entity
grants permission to remove the barriers;
C. removed before the decontamination unit is
disassembled; and
D. disposed of as
asbestos-containing waste.
Subp.
7.
Final visual inspection of asbestos work area.
Areas where critical barriers had been placed must be
inspected and cleaned as specified in subpart 4 to ensure that no surface
contamination is visible.
A. Whenever
contamination is observed, the entire area must be cleaned, using a HEPA-filter
equipped vacuum and wet wiping, or both, until no contamination is
visible.
B. If contamination is
found, the asbestos work area must be cleaned and cleared as specified in
subpart 5.
Subp. 8.
Replacement of heating, ventilating, and air-conditioning system
filters.
The interior surfaces of ventilation system ductwork must be
decontaminated when a visual inspection indicates the presence of
asbestos-containing material. When contamination is indicated, items A to C
apply.
A. Except for small residential
abatement, all disposable system filters that serve the asbestos work area must
be:
(1) replaced at the conclusion of the
project; and
(2) disposed of as
asbestos waste.
B. A
person performing small residential abatement must advise the owner of the
residence of the need to replace disposable filters from heating, ventilation,
and air-conditioning systems once the project is complete.
C. All nondisposable filters must be cleaned
and decontaminated by the person performing abatement after the project is
complete.
Subp. 9.
On-site handling of asbestos-containing waste.
Asbestos-containing waste must be handled on site according
to this subpart.
A. Metal or fiber
drums with locking ring tops must be used for disposal of asbestos-containing
waste material that contains sharp edges, unless the sharp edges can be covered
or blunted.
B. For
asbestos-containing waste material that does not have sharp edges, bags of at
least six-mil polyethylene must be used. Bags must be:
(1) clear;
(2) goosenecked before sealed; and
(3) doubled to prevent leakage.
Statutory Authority: MS s
144.05;
326.70 to
326.81
