NYC-WTC_000200246

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-RAi Spectroscopy (EDS) Method; AHERA Final Rule, EPA Federal Register (40 CFR, Part 763), Vol. 52, No. 210, October 30, 1987

gampig Identification Analysis Parameters

Pro j ec t / S it e : H.S. for Economics Finance, lOQ. Trinicy ?1 , , NYC TEM Sampie Nc. 6OL23 SnEire Building Date Received: 10/04/01 Grid Openings Analysed:__ 4

Project Sample No.: HSSF-S-10/3-45 Average Grid Opening ;106.;00 un

Air Volume: 132Q liters Total Area Analysed: 0.0450 mfn2

Filter Type: MCE 25 mm diam., Pore Size: 0.45 um Analytical Sensitivity Effective Area: 33S mm2 0■0047 s/cc

FIBROUS PARTICULATES ANALYZED Number. Obsezrved CONCENTRATION Total Single Matrix Tctal. Struct. Filter Air Fibers Bundles Clusters Struct. Struct: >g5um Struct/mrn2 StruotTcc ngnn/m3

Chrysotile Asbestos 0 0 0 0 0 0 0.0 0.OQOO 0

Amphibole Asbestos a 0 0 0 0 0 0.0 0.OQOO 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 . OOOC 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 Che method.

Analyzed by.- Report Reviewed by:

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

CITY_21MC100_003267889 N YC-WTC_000200246