Asbestos TEM analysis results, Sept 24, 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: 5554 - 09/24/01

Lab Sample No. 55457 Filter Type MCE mm Operate r

Silent Spl. Nc. 05-24-15 Filter Area 335 mm^2 Instrument I.D. EM 10 CFK Grid I.D- 47 e Disk No. Screen Magnification 16,40Q>: (GO) Area 0.01124 mm^2 Comments. Acc. Voltage 80 kV No. GO co be Analyzed 6 ( 4.721 Struct. Corspd. to 70 s/mm^2.)

Length I.D. of Structure EDS GO. structure Siructure Type (Nonasb. No. Coord. No. >0.5 um F B C M < 5 um > Sum Chrys. Amphibole Nonasb. Ambig./ND Elements) r 37/ Ew // 3X7 7 f) 3 7 6 -

A

1

Photo No. (from 1 in S asbestos- containing samples) r Identify all structures using EDS Grid acceptance^ Check diffraction for asbeatos structures uo to 708/^m (let 4) Store all unrepeated spectra

<50% undissolved filter, overlapped or folded Struct = > 0.5um & > 5:1 Aspect Ratio <10X particulate coverage >50X coverage Totals N= Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares <SX holes or ocaaue areas F B C M Sum Positive diffraction pattern properties conforming to iaboratory identification criteria observed. ■Unused portion For chryaolils: O.TSnm spacinc for (02D) renections, of niur Chrysotile O.S3nm spacing for the layer line repeal, streaking -Avoided portion of (ItO) and (130) reflections. of ruler For amphiboles: 0.53nm layer line repeat, and approx. Portion at niter (2mm vide) ■ IJ 3.A ratio of non-tvinned layer Jine spot spacing to subject to examination Amphibole layer line repeat distance (0.53nm). vX= EDS spectrum conforming to laboratory Ambiguous n identification criteria observed. AMPHIBOLES F= Single Fiber (1-3 intersections s 1-3 fibers) Amosite B= Bundle f>3 fibers <1 fiber diameter apart) 25inm filler Crocidolite Non-asbestos C= Cluster (>3 Intersections) -- ---- ! Slopping Rules: 1--------- - M= Matrix r >50 s/C.O. or in tst 4 G.O. { Anthophyllite NSD= No Struelurea Delected Tremolite Actinolite Non-Identified L.-\MTA\PRIVATE\MJKBC\CADD\rSM3 5/22/93

NYC-WTC_000174884