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NYC-WTC_000209867
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NYC 9/11 Public Portal Document
F
Project Memorandum ASSOCIATES INC.
Subject: 400 Chambers Re: Ambient Air Sampling To: Peter Hoyle Related Management From: Fred Burkhardt Date: October 23, 2001
Attached please find the Air Monitoring Data and Chain of Custody Forms (28 pages) for the ambient air samples collected by ATC Associates and analyzed by phase contrast microscopy (PCM). Samples were collected from three hallway locations and two apartments on each floor of 400 Chambers Street. Apartments sampled are identified in the following table.
Floor Apartments Floor Apartments Penthouse D, R 15 D, R 28 D, R 14 D, R 27 D, R 12 B, L 26 D, R 11 H, R 25 D, R 10 D. T 24 D, R 9 A, M 23 D, R 8 C, U 22 D, R 7 F,T 21 D, R 6 M, Y 20 D, R 5 K,T 1 19 D, R 4 E, V 18 D. R 3 G, U 17 D, R 1 Gym, Children's Play Room, Pool 16 D, R Basement Garage/Hallway
All samples collected recorded fiber levels less than 0.01 f/cc. However, particulate matter raised by maintenance activities obscured the initial analysis of the sample collected from the apartment 9A. This sample was subsequently analyzed using an analogous method and recorded a level less than 0.01 f/cc, consistent with the other four samples collected from the ninth floor and does not present an issue at this time.
In conclusion, based upon the analytical results recording fiber concentrations below the NYC acceptable airborne clearance requirement following an abatement action, it is ATC’s opinion that the ambient air samples collected throughout the building 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.
CITY_21MC100_002848703
NYC-WTC_000209867
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NYC-WTC_000209867Source: NYC Law Department, mirrored locally
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