Air sampling correspondence, 20 Dey Street, Feb 2002

NYC 9/11 Public Portal Document L ,ovr%M t vntc~ r u•v. I CQ I YYCLL.r

L Ermironmental Laboratory 47 Hudson Street, Ossining, New York 10562 I q

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AIHAC 100147

Transmission Electron Microscopy Results Client: Bovis Lend Lease Project #: MBO-025AB 200 Park Avenue New York, New York Date Collected: 10/13/01 Date Rec'd (lab): 10/13/01 Analysis Date: 10/14/01 Sample Location: The Millenium Hilton Hotel 55 Church Street TEM Analyst: D. McCarl New York, New York Analytical Method: AHERA EPA 40 CFR Part 763 Field Technician: M. Sokolinskiy & B. Feldman

Filter Type - MCE 0.45 micron Avg.Grld Opening: 0.0121mm'

Grid Concentration Concentration Lab Number Volume Coll. Grid Area Countable Asb. Sample #: Sample Location: Openings Structures/mm2 Structures/cc 01TEM # Qiters) Analyzed Structures Analyzed

2nd Floor Landing Dock 3709 1260.0 6 0.073 0 <13.77 <0.004 13A

2nd Floor by Elevator 2D 3710 1260.0 6 0.073 0 <13.77 <0.004 14A

2nd Floor by Purchasing Department 3711 1260.0 6 0.073 0 <13.77 <0.004 15A

C Level by Stairway A 3712 1260.0 6 0.073 0 <13.77 <0.004 16A

C Level by Drinking Fountain 3713 1260.0 6 0.073 0 <13.77 <0.004 17A

C Level at Security Office 3714 1260.0 6 0.073 0 <13.77 <0.004 18A

19A Blank 3715 0.0 6 0.073 0 N/A N/A

Blank 3716 0.0 6 0.073 0 N/A N/A 20A

Structures/mm2 Structures/cc Total Average Concentrations <13.77 <0.004

claim product endorsement by the National Voluntary Laboratory Approval This report is the confidential property of our clients. This certificate of analysis/report shall not be used by the client to any agency of the United States Government. The laboratory has no control over air sampling collection. This certificate of analysis/report shall not be reproduced in full, program (NVLAP) or without the written approval of Testwel Laboratories, Inc. O 2001 Testwell Laboratories. Inc 0 Inc.

NYC-WTC 000103848