NYC-WTC_000188709

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 28-11 Queens Plaza North ACCREDITED NVLAP Lab Code # 1187 Long Island City, NY 11101 Report Date; 10/27/01

ASBESTOS FIBER ANALYSIS BY TRANSMISSION ELECTRON MICROSCOPY (TEM) With Fiber Identification by Selected-TUrea 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, 1967

Sample Identification Analysis Parameters

Project/Site: New. Stuyvesant 345 Chambers St., NY, NY TEM Sample No . .-_,52J7S____62222 Exterior &. Interior of Building & Roof Date Received: 10/26/01 Grid Openings Analyzed;__ 4

Project Sample No. Average Grid Opening: 106.00.um

Air Volume : _iS3eiit_ers Total Area Analyzed: 0.0450 rnm2

FlIter Type: MGE 25 mm diam., Pore Size: 0.45 urn Analytical Sensitivity: 22.2 s/rnm2 Effective Area: 385 mm2 0■0044 s/cc

FIBROUS PARTICULATES ANALYZED Number Observed CONCENTRATION Total Single Matrix Total. Struct. Filter Air Fibers Bundles Clusters Struct. Struct > = 5um Struct/rfim2 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 0.0 0.0000 0

Ambiguous 0 0 0 0 0 0 0.0 0.0000 0

Total asbestos (includes ambiguous structures} 0 0 0. 0 0.0000 0 Non-Asbestos 0 0 0 0 0 0 0.0 0.0000 N/A No Identification 0 0 0 0 0 0 0. c 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 Peysakhov Michael A. Gorycki, Ph.D. Director of Electron Microscopy

CITY_21MC100_003082688

NYC-WTC_000188709