NYC-WTC_000200243

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 ELA? #10879 28-11 Queens Plaza North ACCREDITED NVLAP Lab Code # 1187 Long Island City, NY 11101 Report Date; 10/05/01

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

3amole Identification Analysis Parameters

Project/Site: H.S.. for Economics .1 Finance, lOQ Trinity Pl., NYC T2M sample No.: 5606 60119 Entire Building Date Received: 10/04/01 Grid Openings Analyzed:__ 4

Project Sample No.; HSEF-B-10/3~41 Average Grid opening :12^0.0 j^

A.ir Volume.- 1320 liters Total .Area Analysed: Q.Q45G mm2

Filter Type: MC5 25 mm diam.^ Pera Sise:_ 0.45 urn Analytical Sensitivity? 22.2 3/mm2 Effective Area: 585 mm2 0.004.7 s/cc'

FIBROUS PARTICULATES ANALYZED Number Obser^/ed CONCENTRATION Total Single Matrix Total. Struct, Filter Air Fibers Bundles Clusters Struct. Struct > = 5um Struct/mm2 Struct/cc nom/mS

Chrysotile Asbestos 0 0 0 0 0 0 0.0 0.0000 0

Amphibole Asbestos 0 0 0 0 0 0 0.0 0.0000 0

Ambiguous 0 a 0 0 0 0 0.0 0.0000 0

Total asbestos (includes ambiguous structures) 0 0 0.0 Q . 0000 0 Non-Asbestos 0 0 0 0 0 0 3.0 O-OOOQ N/A

Nc Identification 0 0 0 0 Q 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 the method.

Analyzed by; Report Reviewed by;

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

CITY_21MC1OO_OO3267885 NYC-WTC_000200243