NYC-WTC_000188659

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

ASBESTOSFIBERANALYSISBYTRANSMISSIONELECTRON microscopy (TEM) With Fiber Identification by Selected-Area Electron Diffraction (3AED) 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 Identification Analysis Parameters

Project/Site: New Stuyvesant H.S., 345 Chambers St., NY, NY TEM Sample No.; 5716 - 61540 Exterior & Interior of Building &• Roof Date Received: 10/17/01 Grid Openings Analyzed:__ 4

Project Sample No .NSHS-EIR-10/17-S Average Grid Opening :106 0 0 i^

Air Volume: 1899 liters Total Area Ana lyzed : 0;045 0 jnrn2

Filter Tvoe: MCE 25 mm diam. Pore Size: 0.45 um Analytica1 Sens11ivity: 22.2 s/mm2 Effective Area; 385 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 nqm/m3

Chrysotile Asbestos 0 0 0 0 0 0 0.0 0 . OQOO 0

Amphibole Asbestos 0 0 0 0 0 C 0.0 0.0000 0

Ambiguous 0 0 0 0 0 0 0. 0 0 . ocoo 0

Total asbestos (includes ambiguous structures) 0 C 0.0 O.OQOQ 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 . OCOO N/A

Totals (All Structures) 0 C 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 T3M 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_003082290

NYC-WTC_000188659