NYC-WTC_000188714

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP 5784 - 10/2?/01 Lab Sample No. £2325 filter Type MCE 25 mm Ooerator Client Spl. No. 14 .-ilcer Area 38 5 mm"2 Instrument I.D. EM 10 CRX Grid I.n. I Disk Nc . Screen Magnification 16,40OX (GO) Area 0.01124 nm Comments Acc. Voltage 80 kV No. GO to be Analyzed 4 ( 3.147 Struct. Corspd. co 73 s/mrri^I.)

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

II I,

5N

Photo No. (from 1 in 5 aabestoa— Identify all atructurea using EDS Check diffraction for asbeatoa Store all unrepeaLed spectra containing samples) Grid acceptance:! atructurea up to TQa/^m (tat 4) Struck = > O.Sum & > 5:1 Aspect Ratio <S0X undiasolvea filter, overlapped or folded <10X particulate coverage >50X coverage Totals Ns Not Observed (EOS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Positive diffraction pattern properties conforming <SX holes or opaque areas F B C M > Sum to laboratory identification criteria observed. •Unused portion For chrysotile: 0.73nm spacing for (020) renections, or niter Chrysotile Q.SDnm spacing for Uie layer line repost, streaicing ■Avoided porUon of (UO) and (130) reflBcUons. of filler Per amphiboles: O.S3nm layer line repeat, and approx. PorUon of filler (Zmm wide) 3.3 ratio of non-twinned layer line spat spacing to subject to exatninaUon Amphibole layer line repeat distance (0.Sanm). v/= EDS spectrum conforming to laboratory Ambiguous idenUficaUon criteria observed. AMPHIBOLES F- Single Fiber (1-3 intersections = 1-3 fibers) Amosite B= Bundle (>3 fibers <1 fiber diameter apart) C= Cluster (>3 intersections) SSnim nitsr Crocidolite Non—asbestos ------- i Stopptnc Rules: t Anthophyllite M= M.trli NSDs No Structures Detected U:\DATA\PRIVATE\MlKBC\CADDVEMa [ >90 >/G.O. or In let 4I G.D. I Tremolite Actinolite Non—Identified 9/22/98

CITY_21MC100_003082760

NYC-WTC_000188714