NYC-WTC_000202620

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: 10/19/01

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 Analvsig Parameters

ProjecC/Site: P.S. 13QM, 143 Baxter St., NY, NY TEM Sample No.: 5726 61677 Throughout the School Building Date Received: 10/18/01 Grid Clpanings Analysed:__ £

Project Sample No.: 22 Average Grid Opening: 106.00 um

Air Volume: 190S liters Total Area Analyzed: 0.0450 mm2

Filter Type: MCE 25 mm diam., Pore Size: 0.45 um Analytical Sensitivity: 22.2 s/mmC Effective Area: 385 mm2 C.0045 s/cc

FIBROUS PARTICULATES TkNALYZED Number Observed CONCENTRATION Total Single Matrix Total. Struct. Filter Air Fibers Bundles Clusters Struct. Struct >=5um Struct/inm2 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 C.0 0.0000 0

Total asbestos (includes ambiguous structures; 0.0 0.0000 0 Non-Asbestcs 0 0 0 0 0 0 0.0 0.0000 N/A No identification 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:

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

CITY_21MC100_003273881

NYC-WTC_000202620