NYC 9/11 Public Portal Document
12/13/2001 13:28 FAX 212 353 8306 ITC l 002
Ambient Air Sampling
Ass -o c i A,T E s 1 Il,
Subject: Tribeca Towers
105 Duane Street
Re: Ambient Air Sampling
To: Peter Hoyle
Related Manage ,1t
From: Fred Burkhardt
• Date: December 13, 2001
On December 12, 2001, at the requ9sj'of and witnessed by the NYCDEP, ATC collected a total
of ten ambient air sample within Tribeca Tower. Five samples were collected from the
from
common hallway of the tenth floor, with one sample placed directly in front of the supply air
entry point. A second set of five ambient air samples were collected from the second floor air
handler room servicing the common areas including the tenth floor.
In the absence of a specific
ambient standard, ATC has selected as a criteria for acceptable
air
ambient air sample sets, the AHERA re-occupancy requirement following an asbestos
abatement action of an average of less than 70 asbestos structures per square millimeter (<70
s/mm2) per sample set. This criteria has been selected because the AHERA requirement is the
most stringent airborne asbestos cupancy standard available, and has been designed to be
reoc.
protective of children following an asbestos abatement project.
Based upon analytical sample results for all samples recording no asbestos structures detected
which is significantly below the AHERA clearance requirement. It is ATC's opinion that the
ambient air samples collected from these areas are representative of the ambient conditions at
the time of testing and that the areas tested meet an acceptable criterion for re-occupancy. If
you have any questions or require additional explaination of the information presented please
do not hesitate to call me at 212-353-8280.
Thank You.
NYC-WTC 000125929
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