Air sampling correspondence, 20 Dey Street, Feb 2002

NYC 9/11 Public Portal Document

LL LABORATORIES INC. flfl F 1LL TES NYS ELAP #11142 Environmental Laboratory 47 Hudson Street, Ossining, New York 10562 NVLAP #200083-0 ANA # 100147

PCM AIR SAMPLE RESULTS Bovis Lend Lease Date Collected: 09/20/01 Client: Date Rec'd (lab): 09/21/01 MBO-025AB Analysis Date: 09121/01 Project #: Analyst: J. Yarrusso Sample Location: The Millenium Hilton 55 Chruch Street Analytical Method: NIOSH 7400 New York, New York

Field Technician: M. Sokolinkly

Sample #: Sample Location: SampleType 01PCM # Volume Concentration f/cc

1-1 Lobby Center in Hall Ambient 19857 1200 0.051

2-1 Lobby South Side Ambient 19858 1200 0.0492 0 Lobby Floor, Entrance to Ambient 19859 1200 0.0059 3-1 Telemarketing Office

4-3 3rd Floor North Side Ambient 19860 1200 0.0221

3rd Floor South Side Ambient 19861 1200 0.0047 5-3

3rd Floor Center in Kosfter Ambient 19862 1200 0.0137 6-3

7-5 5th Floor Entrance to Pool Ambient 19863 1200 0.0074

5th Floor Esecutive office Ambient 19864 1200 0.0041 8-5

5th Floor Entrance to Computer Ambient 19865 1200 0.0072 9-5 Room

8th Floor Room #803 Ambient 19866 1200 0.0025 10-8

8th Floor Room #806 Ambient 19867 1200 <0.0022 11-8

8th Floor Hallway Between Rooms Ambient 19868 1200 0.0082 12-8 #810 & 811 __AL_ TL. ...i * Limit of quantitation based on volume of air collected and a.o U1uu neius as per we ii' n i tuv ii u1 . , :Gr....

or the limit of quantification reported at value is calculated by using the higher value of either the actual concentration ** by the client & P(0.05) indicating the 95% confidence level at 2 standard deviations. Sample information is provided presented as stated. Laboratory QC data available upon request. * " The laboratory has no control over air not be sampling collection. Reports are the confidential property of our clients. This certificate of analysis/report shall endorsement by the National Voluntary Laboratory Approval Program (NVLAP) or used by the client to claim product agency of the United States Government. This certificate of analysis/report shall not be reproduced except in full, any without the written approval of Testwell Laboratories, Inc.

Deborah McCarl - Laboratory Director

NYC-WTC 000103781