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

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP 5697 - IC/K/OI Lab Sample Mo. 5; 05- Filter Type MCE 25 min Operator Client Spl. No. H£ E TR-io/13-01 Filter Area 3 55 mtr^2 Inscrumenc I.D. EM K. CRY Grid I.D. M Disk Me. Screen .Magnification 1G.400X (GO) Area C.01124 mm Commencs Acc. Volcage 80 lc\ No. GC to be Analyzed I 3.147 Struct. Corspd. “^0 s/rrm^2./

GO. Structure Structure Type Length I.D. of Structure EDS >0.5 um (Nonasb. No, Coord. No. F B C M > Sum Chrys Amphibole Nonasb. Ambig./ND Elements) < 5 um / =32 II

I 4. J) It

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store all unrepeated spectra-^ Photo No. (from 1 in 5 sabestos- Identify all atructurea uaing EDS Check diffraction for aabeatos containing samples) Grid acceptance: I atructurea i up to VOa/i^m (l«t 4) <50X undiaaolved rilter,, overlapped or folded Struct. = > O.Sum A > 5:1 Aspect Ratio <10X particulate coverage >5QX coverage N- Net Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Totals Positive diffraction pattern properties conforming <SX holes or opaque areas F B C M > Sum Io laboratory idenUficaLion criteria observed. *Unua«d portion For ehrysoUlei O.TSnm spacing for (020) rsfleeUona, of niter Chrysotile O.SSnm spacing for the layer line repeat, streaking lidod porUon of (no) and (130} reflecUona. or niter For amphiboles: 0.53nm layer line repeal, and approx. Portion of filler (2min wide) 3.3 ratio of non-twinned layer line spot spacing to aubject to •xaminition Amphibole layer line repeat distance (Q.SSnm). v/s EDU spectrum conforming to laboratory Ambiguous idenUficatlon criteria observed. AMPHIBOLES P« Single Fiber (1-3 Intersections a i-3 fibers) Amosite B= Bundle (>3 fibers <1 fiber diameter apart) C- Cluster (>3 Intersections) 25mm flllar Crocidolite Non-asbestos -------1 supping Rules; I---------- Anthophyllite Ms Matrix NSD= Iio Structure Detected L\DATl\PRIVATB\Ml)«C\CADD\rEM3 [ >90 s/C.O. er In lai 4 C.O. I

o/22/oe Tremolite Actinolite Non-ldentified

CONFIDENTIAL, CITY_21MC1OO_OO3469989

SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176417