NYC-WTC_000213308

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: 10/02/01 ASBESTOS FIBER' ANALYS-I'S BY TRANSMTSSTON ELECTRON MICROSCOPY (TEM') With Fiber Identification by Selected-Area Electron Diffraction” (SAED)” and Energy-Dispersive X-RAY Spectroscopy (EDS) Method: AHERA Final'Rule, EPA Tederai ^Register -(40’CFR, Part'763), Vol. 52, No. 210, October 30, 1987

Sawle Identification Analysis .Parameters

■Projeot/Site: P..S. .23'4M, :292 Greenwich St., NY, NY TEM Sample No.: 5592 - 59912 Entire School Date Received: 10/'02/01- ' Grid Openings Analyzed:__ 4

Project Sample N6.1 PS234M-ES-1.0/2-18 Average Grid Opening: 106.00 um

Air Volume: 1810 liters Total Area Analyzed: 0.0450 inm2 a Filter Type: MCE 25 mm diam., Pore Size: 074S um Analytical Sensitivity: 22.2 s/mni2 Effective Area: 385 mm2 0..0D47 s/cc

FIBROUS PARTICULATES ANALYZED Number Observed CONCENTRATION Total Single Matrix Total. Struct. ■ Filter Air Fibers Bundles Clusters Struct. Struct. >=5um Struct/nm2 Struct/cc ncTTn/mS

/ Chrysotile Asbestos ' '«b .0 ;!0; ..VO'; - P -’P 0.0000. '0

Amphibole Asbestos 0 0 ;o- .. 0 '".Bl 0 •0.0 O.OODO 0 A'- 11/ As4,i^uouaA,®:s< ; 0. ... O'. •. 0,6 O-OOOO,- 0

Total .asbestos (includes .ambiguous structures). ^0 -, -p O.-O 0.0000 0 “. !,V ■

B ■■ ' Non-Asbestos ? O;"' O.'O . N/A o' l^^oopo;.? ' Nb'.,Identificaticm: ; - .0 ' D ;0.,0‘ ' 'N/AI

i'll- Totals'. (All Structures.) 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 o.ut in .accordance with . the. approved TEM method..' . This ■daboratory is in'-'complianceywrt'hLt'he- quality specified' for.the "method.

Analyzed by: .Report Reviewed by:

Marek Peysakhov Michael A. Gorycki, Ph.D. ’■'•■Yl//; ; '■Dlreptbr .'.of. 'El-ect,ron Microscopy

i® -s CITY_21MC100_000462082 NYC-WTC_000213308