NYC-WTC_000182530

NYC 9/11 Public Portal Document

ATC Environmental, .Inc. 104 East 25th Street New York, New York 10010 New York City 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: 09/21/01 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 -3 0. 1997

Sample Identification Anal-ysis Parameters

Project/Site: New Stuyvesant H.S., 345 Chambers St., HY, NY TEM Sample 'Ko. : 5543 - 59289 11th Floor Mechanical Space Date Received: 09/21/01 Grid Openings Analyzed:__ 4

Project Sample No.: NSHS-llMS-9/21-03 Average Grid Opening: 106.00 am

Air Volume: 1820 liters Total Area Analyzed: 0.0450 mm2

Filter Type: MCE 25 mm diam,, Pore Size: 0.45 um Analytical Sensitivity: 22.2 s/mm2 Effective Area: 385 mm2 0.0047 S/CC

FIBROUS PARTICULATES ANALYZED Number Observed CONCENTRATION Total Single Matrix Total. -Struct. Filter Air Fibers Bundles^Clusters Sti2iCt;Struct >=5um Struct/mrri2 nqm/tnl

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

CITY_21MC100_003099176

NYC-WTC_000182530