TEM air analysis report, Oct 22 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 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 (SAEDI 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 Parameters

Project/Site: New stuyvesant H.S., 345 Chambers St., NY, NY TEM Sample No.; 5737 - 61834 Exterior & Interior of Building St Roof Date Received: 10/21/01 Grid Openings Analyzed:__ 4

Project Sample No.: 13 Average Grid Opening: 106.00 urn

A,ir Volume: 1928 liters Total Area Analyzed: 0.0450 mm2

Filter Type: MCE 25 mm dram.. Pore Size: 0.45 um Analytical Sensitivity: 22,2 s/mm2 Effective Area: 385 lTim2 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 noin/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 o' 0 0 0 0.0 0.0000 N/A No Identification 0 0 0 0 0 0 0.0 d.oooo 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_0 03099666

NYC-WTC_000182581