NYC-WTC_000230534

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 NVLA? Lab Code # 1187 Long Island City, NY 11101 Report Date: 10/02/01 ASBESTOS FIBER ANALYSIS BY TRANSMISSION ELECTRON MICROSCOPY (TEM) With Fiber Identificatiun 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: P.S. 234M, 292 Greenwich St., NY, NY TEM Sample No.; 5592 - S9904 Entire School Date Raceived: 10/02/01 Grid Openings Analyzed: 4

Project Sample No.: P5234M-5S-10/2-10 Average Grid Opening: 106,00 urn

Air Volume: 1820 liters Total Area Analyzed; 0.0450 min2

Filter rype: MCE 25 mm diam., Pore Size: 0.45 urn Analytical Sensitivity; 2-2.2 a/mm2 Effective Area; 385 mm2 0 , 0047 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 0 0 0.0 0.0000 0

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) 0 0 0.0 0.0000 0 Non-Asbestos 0 0 0 0 0 0 0.0 0.0000 M/A No Identification 0 0 0 0 0 0 0.0 0.0000 S/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

CONFIDENTIAL, CITY_21MC100_011771661 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000230534