NYC-WTC_000188678

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: 10/22/01

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 140 CFR, Fart 763), Vol. 52, No. 210, October 30, 1987

Sample Identification Analysis Parameters

Project/Site: New Stuyvesant H.S., 345 Chambers St., NY, NY TEM Sample No.: 5737 61831 Exterior & Interior of Building & Roof Date Received: 10/21/01 Grid Openings Analyzed:__ 4

Project Sample No.:_10 Average Grid Opening: 106.00 uni

Air Volume: 1928 liters Total Area Analyzed :^;0450 mm2

Filter Type: MCE 25 mm diam., Pore Size: 0.45 um Analytical Sensitivity :^2;2 s/mm2 Effective Area : 385 inm2 0.0044 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 0 0 0 1 0 22.2 0.0044 147

Amphibole Asbestos 0 0 0 0 0 0 0.0 C.0000 0

Ambiguous 0 0 0 0 0 0 0.0 C . 0000 0

Total asbestos {includes ambiguous structures) 1 0 22.2 0.0044 147 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) 1 0 22.2 0.0044 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

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NYC-WTC_000188678