Asbestos TEM analysis results, New York City schools, Oct 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: 10 Lab Sample Nc r Type mm Operator tint; Spl. No. S 5 mm 2 Ins"rumenc I.r. EM 1( CRN Grid I.r. Disk No. Scr-^er. Magnif icacicr. 26,40C:‘: (GO’ Arsa C mm Comment:? Acc Vcltage 8 0 k\ No. SC cc be Analyzed ■rsrd 3 / mir

GO. structure Structure Type Length I.D. of Structure n or i EDS >0.5 um J (Nonasb. No. Coord. No. F B C M Sum Chrys. Amphibole Nonasb. Ambig./NDi Elements) < 5 um i ( ■0

Store all unrep^ated spectra Photo No. (from 1 in 5 asbestos- Identify all atructurea ueing EDS Check diffraction for aabestoa containing samples) Grid acceptance;! structure* up Id 70a/i^m (1.1 4) <S0X undisBoived niter, overlapped or folded StruiL = > O.&um & > fi-.l Aspect Ratio <10X particulate coverage >S0X coverage at least 20 unfolded or overlapped grid squares Totals N- Hot Observed (EDS spectrum or diffraction pattern) <SX holes or opaque areas f'ositivB diffraction pattern properties conforming FB C M> 5um ti laboratory identification criteria observed. •Unused portion For chrysotile: 0.73nm apacing for (Q20) rsnecUona, of niter Chrysotile C.33nm spacing for the layer line repeat, streaking -Avoided portion of (IIQ) and (130) reflecbona. of niter Por amphiboles: O.SSnm layer line repeat, and approx. PorUon of niter (2mm vids) 3.5 ratio of non-tvinned layer line spot spacing to subject lo examination Amphibole luyar Une repeat distance (O.SSnm).

EDS spectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous P= Single Fiber (1-3 IntereecUons = 1-3 fiben) Amosite B- Bundle (>3 fibers <1 fiber diameter spirt) C= Cluster (>a IntersectionsS Zfimm riitar Crocidolite Non-asbestos ____ I Stepping Rules: I______ Anthophyllite Ms KaLrix MSDs No Structures Detected [ >50 s/C.O. or in tat 4 C.O. I Tremolite Actinolite Non-ldentified L:\DATA\PRtYATE\MlKEC\CADDVEMa 9/2Z/B8

CONFIDENTIAL, CITY_21MC100_003470202 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

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