NYC-WTC_000188615

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 Pinal Rule, EPA Federal Register [40 CFR, Part 763), Vol. 52, No. 210, October 30, 1987

Sample Identification Analysis Parameters

Proj ect/Site: New Stuwesant H.S., 345 Chambers St., NY, NY TEM Sample No.: 5543 - 59295 11th Floor Mechanical Space Date Received: 05/21/01 Grid Opening’s Analyzed : 4

Project Sample No. : NSHS-IIMS-9/21-05 Average Grid Opening: 106.00 um

Air Volume;^182G liters Total Area Analyzed: Q.0450 mm2

Filter Type; MCE 25 mm diam., Pore Size: 0.45 um Analytical Sensitivity:22.^2 s2rtOTi2 Effective Area: 3 85 miTi2 0.0047 s/cc

FIBROUS PARTICULATES ANALYZED Number Observed CONCENTRATION Total Single Matrix Total. Struct. Filter Air Fibers Bundles Clusters Struct. Struct ^Surr, Struct/mmG Struct/cc ngm/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 C 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.oooo N/A

Totals (All Structures) 0 0 0.0 0 . oooc 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_003081937

NYC-WTC_000188615