Specifications - Lord and Son Construction, Inc.

sheathing on work side.
b. Cover sheathing with plastic sheet, sealed with tape as specified on work
area side.
F. Maintenance of Enclosure Systems:
1. Ensure that barriers and plastic linings are effectively sealed and taped.
Repair damaged barriers and remedy defects immediately upon discovery.
2. Visually inspect enclosures at the beginning of each work period.
3. Use smoke methods to test effectiveness of barriers when directed by
Contracting Officer.
G. Negative Pressure System:
1. Provide a fully operational negative air system within the work area
maintaining continuously a pressure differential across work area enclosures
of 0.01 inches of water. Demonstrate to the Contracting Officer the pressure
differential by use of a pressure differential meter or a manometer, before
disturbance of any asbestos containing materials.
2. Continuously monitor and record the pressure differential between the work
area and the building outside of the work area with a monitoring device
incorporating a strip chart recorder.
3. Determining the Ventilation Requirements: Provide fully operational negative
pressure systems supplying a minimum of one air change every 15 minutes.
4. Location of Exhaust Units: Locate exhaust unit(s) so that makeup air enters
work area primarily through decontamination facilities and traverses work area
as much as possible. This may be accomplished by positioning the exhaust
unit(s) at a maximum distance from the worker access opening or other
makeup air sources.
5. Place end of unit or its exhaust duct through an opening in the plastic barrier
or wall covering. The plastic around the unit or duct shall then be sealed with
tape.
6. Vent to outside of building, unless authorized in writing, by attaching lengths of
flexible or rigid duct connected to the air outlet and routed to the nearest
outside opening. Window panes which have to be removed temporarily shall
be reinstalled at the completion of the work.
7. Use of System During Abatement Operations
a. Start exhaust units before beginning work (before any asbestos containing
material is disturbed). After abatement work has begun, run units
continuously to maintain a constant negative pressure until
decontamination of the work area is complete. Do not turn off units at the
end of the work shift or when abatement operations temporarily stop.
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