NYC-WTC_000188673

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: 10/21/01

ASBESTOS FIBER ANALYSIS 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), 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.: 5735 - 61718 Various Sites Inside and Outside the Building Date Received: 10/20/01 Grid Openings Analyzed:__ 4

Project Sample No.: 4 Average Grid Opening: 106.00 um

Air Volume: 1944 liters Total Area Analyzed: 0.0450 mm2

Filter Type: MCE 25 mm diam., Pore Size: 0.45 urn T^alytical Sensitivity:22,;J s/mm2 Effective Area: 3 as mm2 0.0044 s/co

FIBROUS PARTICULATES TmALYZED Number Observed CONCENTRATION Total Single Matrix Total. Struct. Filter Air Fibers Bundles Clusters Struct. Struct >=5uTn Struct/mm2 Struct/cc ngni/m3

Chrysotile Asbestos 0 0 0 0 0 0 0.0 0.0000 C

Amphibole T^bestos 0 0 0 0 0 c 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.OOOO 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:

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

CITY_21MC100_003082407

NYC-WTC_000188673