NYC-WTC_000200241

NYC 9/11 Public Portal Document I .

ATC Environmental, Inc. 104 East 25th Street New York, Mew York 10010 N.Y.C. Board of Education Approved N.Y. State ELAP #10879 29-11 Queens Plaza North ACCREDITED WLAP 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 (SAED) and Energy-Dispersiva X-RAY Spectroscopy (EDS) Method: AHERA Final Rule, EPA Federal Register (10 cfr, Part 763), Vol. 52, Mo. 210, October 30, 1987

Sample Idencifigation Analysis Parameters

.’roject/Site: H.S. for Economics & Finance, 130 Trinity Pl., NYC TEM Sample No . : 5105.^S0nA Entire auildinq Date Received; 10/04/01 Grid.Openings Analysed;__ 4

Project Sample No. : H5EF-5-10./3-.36 Average Grid Opening; 106.00 um

Air Volume: 1910 liters Total Area -Analyzed ;0^045 0 jnm2

Filter Tvoe: MCE 25 mm diam. ?ore Size.- 0.45 um Analytical Sensitivity: 22,2 s/mm2 Effective Area; 335 mml 0.0047 s/ce

FIBROUS PARTICULATES ANALYZED Number Obsazu/ed CONCENTRATION Total Single Matri:< Total. Struct. Filter Air Fibers Bundles Clusters Struct. Struct >-5um Struct/nwn2 Scruct/cc ncfm/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 G. 0000 0 Non-Asbestos 0 0 0 0 0 0 0.0 0.oooo N/A No Identification 0 0 0 0 0 0 0.0 0.0000 N/A

Totals (All Structures) 0 0 0.0 3.0000 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:

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

CITY_21MC1OO_OO326788O NYC-WTC_000200241