Asbestos TEM analysis results, 40 W St, Sep 2001

NYC 9/11 Public Portal Document

ATC Environmental, Inc. n 104 East 25th Street New York, New York 10010 ATC Associates Inc. Approved N.Y. State ELAP #10879 104 East 25th Street ACCREDITED NVLAP Lab Code # 1187 New York, NY 10010 Report Date: 09/20/01 ASBESTOS FIBER ANALYSIS BY TRANSMISSION ELECTRON MICROSCOPY (TEM) With Fiber Identification by Selected-Area Electron Diffraction (SAED) and Energy-Dispersive X-RAY Spectroscopy (EDS) Method: AHERA Final Rule, EPA Federal Register (40 CFR, Part 763), Vol. 52, No. 210, October 30, 1987

T Sample Identification Anaiysis Parameters

Project/Site: 40 Rector Street, 40 Rector St., NY, NY TEM Sample No. : Lobby & 16th Floor Date Received: 09/20/01 Grid Openings Analyzed:__ 4

Project Sample No.: 04 Average Grid Qpenincr: 106.00 um

Air Volume: 1800 liters Total Area Analyzed: 0.045Q mm2

Filter Type: MCE 25 mm diam., Pore Size: 0.45 um Analytical Sensitivity:22;2 s2mm2 Effective Area: 385 mm2 C.QQ48 s/cc

FIBROUS PARTICULATES ANALYZED Number Observed CONCENTRATION Total Single Matrix Total. struct. Filter Air Fibers Bundles Clusters Struct. Struct. >=5um 5truct/mm2 Struct/cc nqm/m3

Chrysotile Asbestos 0 0 0 0 0 0 0.0 0.0000 0

Amphibole Asbestos 0 0 0 0 0 0 0.c 0. 0000 0

Ambiguous 0 0 0 0 0 0 0.0 0.0000 0 L.J

Total asbestos (includes ambiguous structures) 0 0 0.0 0.0000 0 Ncn-Asbestos 0 0 0 0 0 0 0.0 0.0000 N/A No Identification 0 0 0 0 0 0 0.0 0.0000 N/A

Totals (All Structures) 0 0 0.0 0.0000 N/A The estimated uncertainty of this analysis is 1 standard deviation.

Non-asbestos fiber i.d. (EDS/SAED); None detected Amphibole Asbestos Type: None detected The Analysis was carried out in accordance with the approved TEM method. This laboratory is in compliance with the quality specified for ths method.

Analyzed by: Report Reviewed by;

Roman Peysakhov Michael A. Gorycki, Ph.D. Director of Electron Microscopy LJ

NYC-WTC_000174893