Asbestos fiber analysis results, NYC HS, Oct 2001

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 ELAF #10879 28-11 Queen,s Plaza North ACCREDITED NVLAP Lab Code # 1187 Long Island City, NY 11101 Report Date: 10/25/01

ASBESTOS FIBER ANALYSIS BY TRANSMISSION ELECTRON MICROSCOPY(TEM) With Fiber Identificattcn by Selected-Area Electron Diffraction (SAED) and Energy-Dispersive X-RAY Spectroscopy (EDS) Method: AHEfiA Final Rule, EPA Federal Register (40 CFR, Part 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.: 5758 - 62152 Exterior Inteirior of Building & Roof Date Received: 10/24/01 Grid Openings Analyzed:__4

Project Sample Nc.: 16 Average Grid Opening: 106.00 urn

Air Volume': 1936 lifers Total Area Analyzed: 0.0450 mm2

Filter Tyjie: MCE 25 mm diam. , Pore Size: 0.45 um Tknalytical Sensitivity: 22.2 s/mm2 Effective Area: 385 mm2 0.0044 s/cc

FIBROTSPARTICLILATESANALYZED Number Observed CONCENTRATION Total Single Matrix Total. Struct. Filter Air Fioers Bundles Clusters Struct. Struct >=5um Struct/mm2 Struct/cc ngm/ml

Chrysot i1e 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 ani^iguous structures) 0 0 0.0 0.0000 0 Non-Asbestos 0 0 0 0 0 0 0.0 C.0000 N/A No Identification 0 0 0 0 0 0 0.0 0.0000 N/A

Totals (All Structures) 0 0 0.0 C . 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.

Ana.lyzed by; Report Reviewed by:

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

CITY_21MC100_003107262

NYC-WTC_000185605