NYC-WTC_000182597

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: 10/27/01

ASBESTOS FIBER TkNALYSIS BY TRT^NSMISSION 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 30, 198?

Sample Identification Analysis Parameters

Proj ect/Site: Nev/ Stuwesant H.S., 345 Chambers Sb., NY, NY TEM Sample No.: 5775 62366 Exterior & Interior of Building & Roof Date Received: 3^/26/01 • Grid Openings Analyzed:__ 4

Project Sample No.: 7 Average Grid opening: 106 . oo um

Air Volume: 1926 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:385mm2 0 0044 s/cc

FIBROUS PARTICULATES /ANALYZED Number Observed • CONCENTRATION■ Total Single Matrix Total. Struct. Filter Air Fibers Bundles Clusters Struct. Struct >g5um Struct/mm2 Struct/cc ngm/mS

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_21MC1OO_OO3O99837

NYC-WTC_000182597