NYC-WTC_000200049

NYC 9/11 Public Portal Document

ATC Environmental, Inc. 104 East 25th Street New York, New York 10010

N.Y.C. School Construction Authority Approved N.Y. State ELAP #10879 30-30 Thomson Avenue ACCREDITED NVLAP Lab Code # 1187 Long Island City, NY 11101 -Report Date; 09/17/01

ASBESTOS FIBER ANALYSIS BY TRANSMISSION ELECTRON MICROSCOPY (TEM) With Fiber Identification by Selected-Area Electron Diffraction (SAED) a.nd Energy-Dispersive X-RAY Spectroscopy (EDS) Method; AKERA Final Rule. EPA Federal Register (40 CFR, Part 763), Vol. 52, No. 210, October 30, 1987

Sample Identification Analysis Parameters

Project/site: World Trade Center, WY, NY TEM Sample No. .• 5517 59057 Personal Exposui'e Monitoring Dace Received:_CS_n2Z2i Grid Openings Analyzed: 10

Project Sample Ko.: NYE-005 Average Grid Opening.- 106.00 um

Air Volume: 120 liters Total Area Analyzed: 0.1124 rnm2

Filter Type: MCE 25 mm diam., Pore Size: 0.45 um Analytical Sensitivity Effective Area:^ 3 6 5 mfn2 0.0285 S/CC

FIBROUS PTkRTICULATES ANALYZED Number Observed CONCENTRATION Total Single Matrix Total. Struct. Filter Air Fibers Bundles Clusters Struct. Struct >=5um Struct/mm2 Struct/cc ngm/m3

Chrysotile Asbestos 14 1 1 24 40 8 355. 9 1 .1418 37678

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! 40 e 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

Totals (All Structures) 40 8 355.9 1.1410 N/A The estimated uncertainty of this analysis is l standard deviation.

Non-asbestcs 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_011273337

NYC-WTC_000200049