Asbestos TEM analysis report, Sept 28, 2001

NYC 9/11 Public Portal Document

ATC Environmental, Inc. 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: 09/28/01 n 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

Sample Identification Analysis Parameters

Project/Site: 40 Rector Street, MY, NY TEM Sample No.: 5573 - 59628 ■I Floors 5-7 Date Received: 09/28/01 Grid Openings Analyzed:__ 6

Project Sample No.: 17 Average Grid Opening; 106.00 urn

Air Volume: 1300 liters Total Area Analyzed

Filter Type: MCE 25 mm diam., Pore Size; 0.45 um Analytical Sensitivity: 14.8 s/mm2 Effective Area; 385 mm2 0.Q044 s/cc

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

Chrysotile Asbestos 1 0 0 5 6 1 89.0 0.0263 869 lJ Amphibole Asbestos 0 0 0 0 0 0 0.0 0.0000 0 '-■■1

Ambiguous 0 0 0 0 0 0 0.0 0 . oooo 0

Total asbestos (includes ambiguous structures) 6 1 89.0 0.0253 869 Non-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) 6 1 89.0 0.0263 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 the method.

n Analyzed by: Report Reviewed by:

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

NYC-WTC_000174872