Asbestos TEM analysis results, Sep 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS ■-'N LAB GROUP #: 5537 - 09/20/01 Lab Sample No. 593Q8 Filter Type MCE 25 mm Operator Client Sol. No. 04 Filter Area 3.35 mm'^2 Instrument I.D. EM 10 CFK Grtd I.D. Disk Nc. f. I Screen Magnification 16,40QX (GO) Arsa 0 , 01124 mm"2 Comments Acc. Voltage 80 kV No. GO to be Analyzed _4 ( 3.147 Struct. Corspc. to 7Q 5/mm'^2.)

Length I.D. of Structure n or EDS GO. structure Structure Type (Nonasb.

w No Coord. No. >0.5 um F B C M < 5 um Sum Chrys. Amphibole Nonasfa. Ambig./ND Elements)

l" ■> 7<SJ 2 zy // 7

L._.J

I

i-J

Photo No. (from 1 in 5 as leatoa- Identify all atructurea using SOS Check diffraction for asbestos Store ail unrepeatcd spectra— containing samples} Grid acceptance:) structures up to 70a/Am (laL 4) <50% undissolvea filter, overlapped or folded Struct. = > Q.Sum * > 5:1 Aspect Ratio <10% particulate coverage >50% coverage Totals ff= Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares PoiiUvs diffraction pattern properties conforming <5% holes or opaque areas F B C M > Sum to laboratory identification criteria observed. Unused portion For chrysotile: 0.73nm ipaclng for (020) rsflecUons, of filter Chrysotile 0,33nm ipaclng for the layer line repeat, streaking Avoided portion of (UQ) and (130) reHectiona. at filler For amphiboles: 3.53nni layer line repeat, and approx. Portion of niter (2mm wide) 3.3 ratio of non-lwtnned layer Une spot spacing to subject to Amphibole layer line repeat distance (0.3Snm). examination

v/= EDS spectrum conforming to laboratory Ambiguous identification criteria obaerved. AMPHIBOLES Fe Single Fiber (1-3 intersections = 1-3 fibera) Amosite 0= Bundle (>3 fibers <1 fiber diameter apart) 2&mm filter Crocidolite Non-asbestos C= Cluster (>3 intersections) --------- 1 Stopping Rules: I------- Anthophyllite M= Matrix >30 a/G.O. or in lit 4 0.0. Tremolite rn N5D= No Structures Detected Non-ldentiiled Actinolite L:\flATA\PRlYATS\MJKEG\CADD\rKM3 8/22/98

NYC-WTC_000174895