3.10
following the procedures described herein. The bottom layer of protective poly
coverings, the Decontamination Facilities, the HEPA exhaust systems and all
barrier walls shall remain in place and in use.
AIR MONITORING BY ENGINEER
This Subsection describes air monitoring carried out by the Engineer to verify that the
areas beyond the Work Area or Regulated Area and the outside environment remain
uncontaminated. This Subsection also sets forth airborne fiber levels both inside and
outside the Work Area or Regulated Area as action levels, and describes the action
required by the Contractor if an action level is met or exceeded. The Engineer will be
conducting air monitoring throughout the course of the Work in accordance with all
applicable regulations.
All perimeter sampling and analysis will be performed by the Engineer. Written reports
of all air monitoring tests will be posted at the job site on a daily basis.
Personnel air monitoring required by OSHA 1s the responsibility of the Contractor and is
not covered in this Subsection.
Work Area Isolation: The purpose of the Engineer's air monitoring will be to detect
faults in the Work Area isolation such as:
° Contamination of areas outside of the Work Area with airborne asbestos fibers,
° Failure of filtration or rupture in the negative pressure system,
° Upon notification by the Engineer that an Action Level, or any of the above has
been exceeded, the Contractor shall immediately cease asbestos Abatement
Activities until the fault 1s corrected. Work shall not recommence until
authorized by the Engineer.
Final Air Clearance Testing: To determine if the elevated airborne fiber counts
encountered during abatement operations have been reduced to an acceptable level, the
Engineer will sample and analyze air per Subsection 3.12.
Airborne Fiber Counts:
1. Inside Work Area: The Contractor shall maintain an average airborne fiber
concentration in the Work Area of less than 0.5 fibers per cubic centimeter. Ifthe
fiber concentration rises above this figure for any sample taken, revise work
procedures to lower fiber concentration. If the Time Weighted Average (TWA)
fiber count for any work shift or 8 hour period exceeds 0.5 fibers per cubic
centimeter, stop all work, leave negative air system in operation and notify
Engineer. Do not recommence work until authorized in writing by Engineer.
02111-45
