NYC-WTC_000202653

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 (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 IdentifiGation Analysis Parameters

Project/Site: H.S. for Economics & Finance, 100 Trinity PI., NYC TEM Sample No. .- 5606 - 60103 Entire Building Date Received: 10/04/01 Grid Openings Analyzed;__ 4

Project Sainple No.; HSEF-E~io/3«25 Average Grid Opening: 106.00 urn

Air Volume: 1820 liters Total Area Analyzed; 0.0450 mm2

Filter Type; MCE 25 mm diam,, Pore Size: 0.45 um Analytical Sensitivity: 22.2 s/mm2 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/nHn2 Strvct/cc ncnn/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 0 0.0 0.0000 N/A

Totals (All structures) 0 0 0.0 0.0000 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_21MC100_003274908

NYC-WTC_000202653