NYC-WTC_000188710

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 ANTALYSIS 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), Vcl. 52, No. 210, October 30, 1987

SampJe Identification Analysis Parameters

Project/Site: New Stuyvesant H.S., 345 Chambers. St., NY, NY TEM Sample No.: 5775 62381 Exterior & Interior of Building & Roof Date Received: 10/26/01 Grid Openings Analyzed-.__ 4

Project Sample No. : 20 Average Grid Opening :106;00 2^

Air Volume: 1952 liters Total Area Analyzed : p;04.50 mrn^

Filter Type: MCE 25 mm diam., , Pore Size: 0.45 urn Analytical Sensitivity: 22.2 s/mTn2 Effective Area: 385 mm2 0■0044 s/cc

FIBROUS PARTICULATES ANALYZED Number Observed CONCENTRATION Total Single Matrix Total. Struct. Filter Air Fibers Bundles Clusters Struct. Struct > = 5uin Struct/mm2 Struct/cc ngm/m3

Chrysotile Asbestos 0 0 0 0 C 0 0. C 0.0000 0

Amphibole Asbestos 0 0 0 0 C 0 0.0 0.0000 0

Ambiguous 0 0 0 0 0 0 0.0 0.oooo 0

Total asbestos {includes ambiguous structures) 0 0 0.0 0.0000 0 Non-Asbestos 0 0 0 0 0 0 0.0 0.oooo N/A No Identification 0 0 0 0 0 0 0. 0 0.oooo 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_003082696

NYC-WTC_000188710