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

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAE GROUP ti : S IvZifi/Oi Lab Sample Nc. 61648 Flleer Type MCE 25 mm Operator /^(r 'lienr .Spl. No Area 38 5 mrp 2 Instrument I.D EM lu -RX Grid T D. Disk No Screen Magnitication -c,400X i GO J Are a mni Comments Acc . VD-tage 8 0 kV Nc. GO co be Analysed 4 143 Spruce. Corsod. co 7C s/nitu‘^2

__ 130,___ Structure Structure Type Length I.D. of Structure EDS >0.5 um (Nonasb. NoJ Coord. No. F B C M > Sum Chrys. Amphibole Nonasb. Ambig./ND Elements) < 5 um

/

? Pl 7/?.

^Photc No. (from i in 5 asbe.'itOB- Store all unrepeated spectra-^ Identify all structurea uaing EDS Check diffraction for aabestoa containing samples) Grid acceptance: I structures up to TOs/z^in (l«t 4) <50X undisBOlvea filter, overlapped or loldea Struct = > 0.5um & > 5:1 Aspect Ratio <IOX particulate coverage >50% coverage Totals Ns Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares <5% holes or opaque areas F B C M > Sum ,/= Pasi Live diffraction pattern properties conforming to laboratory identification criteria observed. 'Unuaed portion Fur chrysotile: Q.73nm spacing for (020) reflections, Of niter Chrysotile I O.SSnm spacing for the layer line repeat, streaking -Avoided portion of (110) end (130) rcflectlDns. of niter For amphiboles: O.&Snm layer line repeat, and approx. Portion of filter (2mm wide) 3.9 ratio of non-tvinned layer line spot spacing to subject to examination Amphibole layer line repeat distance ;0.53nm). vA: EDS spectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous Fs Single Fiber (1-3 IntersccUons = 1-3 fibers) Amosite B= Bundle (>3 fibers <1 fiber diameter apart) 25mm fillar Crocidolite Non-asbestos Cs Cluster (>3 intersections) —i Stopping Rutes: L—— Matrix Anthophyllite -NSDs: No Structures Detected L:\DATA\PRIVATE\MIKBC\CADD\rEM3 0/22/S8 [>S0 i/C.O. or in Ist 4 C.O. I Tremolite Actinolite Non-Identified

CONFIDENTIAL, CITY_21MC100_003470152 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176428