Asbestos TEM micrograph data sheet, Oct 26 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS GROUP # ; 1 0 / 2 b ! 01

Lab Sample Imo Filler Type MCE 25 run Operacor hf Client .'-pl- Me. Fiicer Area 38b mm Ins-rument l.D. 10 CRX Grid I.D. Ci£k No. Screen Magnification :-6,40'0X' (GO) Area 0.01124 mm'^2 Comments Acc. Vortace 8 0 kV No. GO CO be Analyzed _4 I 3.147 Scruct. CorSPd. to 70 s.^mm"2

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

-J 21

___________ ____ 1 ________ L Photo No. (from 1 in 5 asbestos- Identify all structures using EDS Check diffraction for asbestos store all unrepeated spectra—' containing samples) Btruelure. up to TOn/Am Grid acceptance:! (fl -u <50X undisBolveo filterl overlapped or Folded Struct = > 0.5um & > 5:1 Aspect Ratio <10X particulate coverage >50% coverage Totals N= Nel. Observed (EDS spectrum ur diffraction pattern) at least 20 unfolded or overlapped grid squares <SX holes or opaque areas Positive diffraction pattern properties conforming F B C M > Sum to aboratory identification criteria observed. •Unused portion Par chrysotile: 0,73nm spneirig lor (020) reflecUoni, O.Sflnm spacing for the layer lirte repeat, streaking of (110) and (130) reflections. of niur -Avoided portion of filter Chrysotile i III Por amphiboles: 0.53nm layer line repeat, and approx. PorUon of niter (2mm wide) 3.5 ratio of non-t»inned layer line spot spacing to •ubject to examination Amphibole i layer line repeat distanee (0.53nnj). sX- EDS spectrum conforming to laboratory Ider.Ufication criteria observed. AMPHIBOLES Ambiguous F= Sin|Ie Fiber (1-3 Interaectlon. = 1-3 fiber.) Amosite B~ Bundle (>3 fibers <1 fiber diameter apart) Zaram fllLsr Crocidolite Non-asbestos

□ C= Cluster (>3 Intersections) J Slopping Rules; L H= Uatrii Anthophyllite NSD= No Structures Detected [ >&0 a/G.O. or tn lit 4 C.O. Tremolite Actinolite Non-ldentified L\DATA',PRtVATE\MIKBC\CAD0VBM3 S/22/90

CONFIDENTIAL, CITY_21MC100_003473406

SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177621