3.1.4
Local Exhaust System
**************************************************************************
NOTE: When a negative pressure enclosure is not
required, delete the requirements for the local
exhaust system and pressure differential recording.
**************************************************************************
Provide a local exhaust system in the asbestos control area in accordance
with ANSI Z9.2 and 29 CFR 1926.1101 that will provide at least four air
changes per hour inside of the negative pressure enclosure. Local exhaust
equipment shall be operated 24 hours per day, until the asbestos control
area is removed and shall be leak proof to the filter and equipped with
HEPA filters. Maintain a minimum pressure differential in the control area
of minus 0.51 mm 0.02 inch of water column relative to adjacent, unsealed
areas. Provide continuous 24-hour per day monitoring of the pressure
differential with a pressure differential automatic recording instrument.
In no case shall the building ventilation system be used as the local
exhaust system for the asbestos control area. Filters on exhaust equipment
shall conform to ANSI Z9.2 and UL 586. The local exhaust system shall
terminate out of doors and remote from any public access or ventilation
system intakes.
3.1.5
Tools
Vacuums shall be leak proof to the filter and equipped with HEPA filters.
Filters on vacuums shall conform to ANSI Z9.2 and UL 586. Do not use power
tools to remove asbestos containing materials unless the tool is equipped
with effective, integral HEPA filtered exhaust ventilation systems. Remove
all residual asbestos from reusable tools prior to storage or reuse.
3.1.6
Rental Equipment
If rental equipment is to be used, furnish written notification to the
rental agency concerning the intended use of the equipment and the
possibility of asbestos contamination of the equipment.
[3.1.7
Glovebags
**************************************************************************
NOTE: Include this paragraph if glovebag technique
is permitted to be used in the project.
**************************************************************************
Submit written manufacturers proof that glovebags will not break down under
expected temperatures and conditions.
]3.2
WORK PROCEDURE
**************************************************************************
NOTE: Use wet removal procedures in almost all
cases. Wet removal is the preferred method and the
least hazardous. Dry removal as an option can be
used to allow the Contractor to use dry removal
where wet removal may damage equipment or present an
extreme hazard. Dry removal as the only method of
removal should only be specified if freezing is
likely to occur, safety hazards preclude the use of
water, or severe water damage to equipment, etc.,
SECTION 13281N
Page 25
Previous Page
