Asbestos TEM analysis results, Oct 16 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: 5709 - 10/16/01 Lab Sample No. 61444 Client: Spl. No. NSHS-SIR-10/15-11 Filter Type MCE 25 mm Filter Area 38 5 "im'l Operator AL Inscrument I.D. EM 10 CRX Grid I.D. Disk No. Screen Magnification 16,4OOX (GO) Area 0.01124 mm"2 Comments Acc. Voltage 80 kV No. GO to be Analyzed _4 { 3.147 Struct. Corspd. co 70

GO. Structure structure Type Length I.D. of Structure EDS ^0.5 um (Nonasb. No, Coord. No. F B C M Sum Chrys. Amphibole Nonasb. Ambig./ND Elements) < 5 um

7P - -O’/ (/ 7/^

Photo No. (from 1 in S as lestos— Identify all etructurea uaing EDS Check diffraction for aabeatos store all unrepeated epectra containing samples) Grid acceptance:! structures up to 70s/^m (let 4) <S0X undiasolvecT niter? overlapped or folded struct. = > 0.5um & > 8:1 Aspect Ratio <10X particulate coverage >50X coverage Totals N= Not Observed (EDS spectrum or diffraction pattern) at leaat 20 unfolded or overlapped grid squares y/s Positive difTraeUon pattern properties conforming <5X holes or opaque areas F B C M > Sum to laboratory identification criteria observed. 'Unused portion For chrysotilB: Q.73nm spsclag for (020) reflections, ' of niter Chrysotile 0.33nm spacing for the le/er line repeat, streaking ’Avoided portion of (110) and (130) refleeLions. of niter For amphiboles: 0.33nm layer line repeat, and approx. Portion of filter (2mm vida) 3.9 ratio of non-tvinned layer Une spot apacing to subject to •KamiOatJon Amphibole layer line repoat diatanee (O.SSnm).

v/= EDS spectrum conforming., to laboratory IdentlhcaUon criteria observed. AMPHIBOLES Ambiguous Fs Single Fiber (1-3 InteraecLIona = 1-3 fibers) Amosite fis Bundle (>3 fibers <1. fiber diameter apart) C= Cluster (>3 Intersections) Zamm niter Crocidolite Non-asbestos ------- 1 stopping Rules: i--------- - Anthophyllite Us Matrix HSOs No Structures Detected U\DATA\PRWAT^MIKW;\CAMV«U3 [ >30

»/22/Be s/G.O. or in 1st 4 C.O. Tremolite Actinolite Non-Identified

CITY_21MC1OO_OO3O99474

NYC-WTC_000182561