NYC 9/11 Public Portal Document
ambient group inc.
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October 2, 2001
Mr. Mike Versace
Paramount Group
180 Maiden Lane
New York, New York 10005
Re: 180 Maiden Lane
5`h Floor - ACS Fan Unit 1 through 6
Ambient Project #211414
Dear Mr. Versace:
Ambient Group, Inc. performed air monitoring during removal and clean-up procedures
on the 5`'' floor, ACS fan units 1 through 6, at 180 Maiden Lane, New York, NY. Work
was performed on September 21 to September 23, 2001.
Ambient Group, Inc. collected and analyzed a total of thirty (30) airborne fiber samples
over the course of this project. Of this total, thirteen (13) were contamination samples,
twelve (12) were re-occupancy samples and five (5) samples were field blanks.
Analytical results indicated airborne fiber levels below 0.01 fibers/cm3. Sample analysis
was conducted by Phase Contrast Microscopy (PCM) in accordance with NIOSH method
7400. A copy of the results are attached. The designated work areas were released for
reoccupancy upon receipt of the analysis results and a final visual inspection that found
no visible debris.
Should you have any questions regarding this information, please feel free to call me.
Sincerely,
Signed for Ambient Group; fnc. by
William Esposito r.2
President
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NYC-WTC 000097388
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