NYC-WTC_000188666

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; 10/18/01

ASBESTOS FIBER ANALYSIS BY TRTkNSMISSION 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, 1987

Sample Identifteation Analysis Parameters

Project/Site: New Stuyvesant H.S., 345 Chambers St., NY, NY TEM Sample No.: 5725 61647 Exterior & Interior of Building & Roof Dace Received: 10/18/Cl Grid Openings Analyzed;__4

Project Sample No. Average Grid Opening106.00 urn

Air Volume :^19201 iters • Total Area Analyzed: 0,0450 mm2

Filter Typ e: MCE 25 mni diam., Pore Size: 0.45 um Analytical Sensit ivity :22;^2 s/mm2 Effective Area: 385 mm2 0 ■ 0Q45 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 ngm/m3

Chrysotile Asbestos 0 0 0 1 1 0 22.2 0.0045 147

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) 1 0 22.2 0.0045 14 7 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) 1 0 22.2 0.0045 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:

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

CITY_21MC100_003082322

NYC-WTC_000188666