NYC-WTC_000205255

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, Parc 763), Vol, 52. No. 210, October 30, 1987

Sample Identification Analysis Parameters

Project/Site: H.S. for Economics & Finance, 100 Trinity Pl., NYC TEM Sample No. : 5SOS 60117 Entire Building Date .deceived; lC/04/01 Grid Openings Anal/zed:__ 4

Project Sample No.: HSEF-E-lQ/3-39 Average Grid Opening; 106.00 urn

Air Volume: 1810 liters Total Area Analyzed: Q.0450 mm2

Filter Type: MCE 25 mm diam., Pore Size: 0.45 um Analytical Sensitivity :22;2 s2rnm2 Effective Area: 3B5 inm2 0.0047 s/cc

FIBROUS PARTICULATES 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 0 0 0 0 0 0 0.0 0 . 00cc 0

Amphibole Asbestos 0 0 0 0 0 0 0.0 0.0000 0

Ambiguous 0 0 0 0 0 0 0.0 u. uouu 0

Total asbestos (includes ambiguous structures) 0 0 0.0 0 . 0000 (3 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 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_009279597

NYC-WTC_000205255