Asbestos fiber TEM analysis report, Oct 13 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: 10/14/01

ASBESTOS FIBER AljALYSIS BY TRANSMISSION ELECTRON MICROSCOPY (TEM) Kith Fiber Identification b^- Selected-Area Electron Diffraction SAEDi and Energy-Dispersive X-RAY Spectroscopy (EDS) Method: ^HERA Pinal Rule, SPA Federal Register (40 CFR, Part 763), Vol. 52, No. 210, October 30, 19B7

Sample Identification Analysis Parameters

Project/Site; New Stuyvesaiiu R.S,, 345 Chambers St., NYj NY TEM Sample No.: 5687 61057 Exterior i rnterior of Building Roof Date Received; 10/14/01 Grid Openings Analysed;_ 4

Project Sample No. : NSHS-E'R-IC/13-04 Average Grid Opening : _l 0£^00 um

Air Volume-. 191"’ liters Total Area Analyzed: 0.0450 mm2

Filter Ty]3e; MCE 25 mm dian , , Pore Size: 0.45 urn Analytical Sensitivity:£2;2 s/nm2 Effective Arees: 365 mm2 0.0045 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/rri3

Chrysotile Asbestos G 0 0 0 0 0 0.0 0.0000 0

Amphibole Asbestos ;l 0 0 0 1 1 22.2 0.0045 147

Ambiguous 0 0 0 0 0 0 0.0 0.0000 0

Total asbestos {includes ambiguous structures) 22.2 0.0045 147 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 22.2 0 . 0045 N/A The estimated uncertainty oi 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;

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

CONFIDENTIAL, CITY_21MC100_003469980

SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176415