NYC-WTC_000205253

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: 10/05/01

ASBESTOS FIBER ANALYSIS BY TRANSMISSION ELECTRON MICROSCOPY (TEM) With Fiber Identification by Selected-Area Electron Diffraction (SAEDl and Energy-Dispersive X-RAY Spectroscopy (EDS) Method: AHERA Final Rule, ERA Federal Register (40 CFR, Part 763), Vol. 52, No. 210, October 30, 1987

Sample Zdentification Analysis Parameters

Project/Site; H.S. for Economics &. Finance, 100 Trinity NYC TEM Sample No.: 5606 6C081 Entire Building Date Received Grid Openings Analyzed:__ 4

Project Sample No. : HSEF-E-10/3 - 03 Average Grid Opening: 106.00 urn

Air Volume: 1810 liters Total Area Analyzed: Q.C4S0 mm2

Filter Type: MCE 25 mm diam. Pore Size: 0.45 urn Analytical Sensitivity:22;2 s/rT^ 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 > = 5um Struct/mrn2 Struct/cc nqm/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 N/A No Identification 0 0 0 0 0 c 0.0 0.0000 N/A

Totals ;a11 Structures) 0 Cj 0.0 0 . 0000 N/A Tine estimated uncertainty of this analysis is 1 standard deviatio.n.

Kon-asbestos fiber i.d. (EDS/SAED): None detected Amphibole Asbestos Type: None detected The Analysis was carried out ir accordance with the approved TEM method. This laboratory is in compliance with the quality specified for the method.

Analyzed by: Report Reviewed by:

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

CITY_21MC100_0092 79562

NYC-WTC_000205253