NYC-WTC_000232456

NYC 9/11 Public Portal Document

I ATC Environmental, Inc.

I 104 East 25th Street New York, New York 10010

N.Y.C. School Construction Authority Approved N.Y. State ELAP #10879 I 30-30 Thomson Avenue Long Island City, NY 11101 ACCREDITED NVLAP Lab Code # 1187 Report Date: 09/17/01 I ASBESTOS FIBER ANALYSIS BY TRANSMISSION ELECTRON MICROSCOPY (TSM) ■ With Fiber Identification by Selected-Area Electron Diffraction (SAED) and Energy-Dispersive X-RAY Spectroscopy (EDS)

Method: AHERA Final Rule, ERA Federal Register (40 CFR, Part 7631, Vol. 52, No. 210,. October 30, 1987 I Sample Identification Analysis Parameters

TEM Sample No.: 5517 - 59057

I Project/Sice: world_Trade_Cencer,_Ny,_NX Personal Exposure Moniborinq Dace Received: 09/17/01 Grid Openings Analyzed: IQ

I Project Sample No.: NYE-009 Average Grid Opening: 106.0C um

Air Volume: 120 liters Total Area Analyzed: 0.1124 rnm2 H Filter Type: MCE 25 mm diam. Pore Size: 0.45 um Analytical Sensitivity Effective Area: 395 mm2 0.Q26S s/cc

FIBROUS PARTICULATES ANALYZED Number Observed CONCENTRATION

I Single Fibers Bundles Clusters Matrix Struct Total. Struct. Total Struct. >»5um ■Struct/mm2 Filter Struct/cc Air ngm/m3 H Chrysotile Asbestos 14 1 1 24 40 3 355.9 1.1418 37678

Amphibole Asbestos 0 0 0 0 0 0 0.0 0.0000 0

I Ambiguous 0 0 0 0 0 0 0.0 0.0000 0

I Total asbestos (includes ambiguous structures) 40 8 355.9 1.1418 37678 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

I Totals (All Structures) The estimated uncertainty of this analysis is 1 standard deviation. 40 8 355. 9 1.1418 N/A

I 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:

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

I CITY_21MC100_010237423

NYC-WTC_000232456