NYC-WTC_000200249

NYC 9/11 Public Portal Document

ATC Environmental, Inc. 104 East 25th Street: New York, New York 10010 N.Y.C. Board of Education Approved N.Y. State ELAP #10879 23-11 Queens Plaza North ACCREDITED NVLAP Lab Code # 1187 Long Island City, NY 11101 Report Date: 10/05/01 ASBESTOS FIBER ANALYSIS BY TRANSMISSIOM ELECTRON MICROSCOPY~(TSM) 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 Paramecers

Project/Site: H.S. for Economics & Finance, IQQ Trinity Pl., NYC TEM Sample No. ;56^ 60130 Entire Building Date Received: 10/04/01 Grid Openings Analyzed:__ 4

Project. Sample No. HSEF-S-lQ/3-52 Average Grid Qpenincr: 106. QQ um

Air Volume: 1810 liters Total Area Analysed; 0.0450 mm2

Filter Tvoe: MCE 25 mm diam. Pore Size: 0.45 um Analytical Sensitivity; 22.2 s/mm2 Effective Area: 385 mm2 0.0047 s/cc

FIBROUS PARTICULATES ANALYZED Number Observed CONCENTRATION Total Single Matrix Total. Struct. Filter Air Fibers Bundles Clusters Struct. Struct >=Sum Struct/mm2 Struct/cc nam/m3

Chrysotile Asbestos 0 0 0 0 0 0 0.0 0.0000 0

Amphibole Asbestos 0 0 0 Q 0 0 0.0 0.0000 0

Ambiguous 0 0 0 0 0 0 0.0 0.0000 0

Total asbestos (includes ambiguous structures) 0 0 0.0 Q.OOQO Q 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 (Ail 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 the method.

Analyzed by: Report Reviewed by:

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

CITY_2IMCl00_003267896

NYC-WTC_000200249