NYC-WTC_000205254

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 TRTkNSMISSION 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 Analysis Parameters

Project/Site: H.S, for Economics & Finance, ICO Trinity Pl., NYC TEM Sample No.; 5606 60094 Entire Building Date Received: IQ/04/QI Grid Openings Analyzed:__ 4

Project Sample No.: HSEF-E-lO/3-Ib Average Grid Opening; 106.00 um

Air Volume: 1613 Liters Total Area Analyzed :0;0450 ram2

Filter Type: MCE 25 mm diam., Pore Size: 0.45 um Analytical Sensitivity: 22.2 3/mm2 Effective Area: 385 mm2 0.0047 s/cc

FIBROUS PARTICULATES ANALYZED Number Observed CONCENTRATION Total Single Matrix Total. struct. Filter Air Fibers Bundies Clusters Struct. Struct > = 5urTi Struct/mmS Struct/cc narn/m3

Chrysotile Asbestos 1 0 0 0 1 22.2 0 . 0047 156

Amphibole Asbestos 0 0 0 C 0 0 0.0 0.0000 0

Ambiguous 0 0 0 C 0 0 0.0 0.0000 0

Total asbestos (includes ambigunua structures) 1 22.2 0.0047 156

Non-Asbestos 0 0 0 0 0 0 c. c 0.0000 N/A

No Identification 0 C 0 0 0 0 0.0 0.0000 N/A

Totals (All Structures) 1 1 22 . 2 0 . 0047 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:

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

CITY_21MC100_009279575

NYC-WTC_000205254