Asbestos TEM analysis results, Oct 20 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: S735 - 10/20/01

Lab Sample No. 61730 Filcer Ty-pe MCE 25 mm Operacor Client Spl. No. 16 Filter Area 385 mm"2 Instrumenc I.D. EM 10 CRX Grid I.D. Disk No. Screen Magnification 16,4OOX (GO) Area 0.01124 mtn"2 Comments Acc. Voltage 80 kV Ng. go to be Analyzed 4 147 Struct. Corspd. co 70 s/mm^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

/|

Photo No. (from 1 in 5 aabeatoa- Identify all atructurea using EDS Check diffraction for asbestoa Store all unrepcated apectra— containing samples). Grid acceptance:! atructurea up to VOs/t^m (let 4) <50X undissolved filterT^overiapped or folded Struct. = > O.Sum k > S:1 Aspect Ratio <10X particulate coverage >SOX coverage Totals Ns Not Observed (EDS spectrum ar diffraction pattern) at least 20 unfolded or overlapped grid squares Positive diffraction pattern properties conforming <SX holes or opaque areas F B C M > Sum la laboratory identification criteria observed. lused portion Por ehrysoUlat 0.73nm spacing for (020) reflecUona, or niter Chrysotile O.&anm spacing for the layer line repeat, streaking -Avoided porUoQ of (HO) and (130) reflections. of filler Por amphiboles: 0.53nm layer line repeat, and approx. Portion of niter (2min wide) 3.3 ratio of non-twinned layer Une spot spacing to ■ubjoet U Amphibole layer Una repeat distance (Q.S3nm). eumiaatien EDS spectrum conforming to laboratory Ambiguous identification criteria observed. AMPHIBOLES Ps Single Fiber (1-3 intersecUona = 1-3 ftbera) Amosite Bs Bundle (>3 fibers <1 fiber diameter apart) SSmm riltw Crocidolite Non—asbestos C= Cluster (>3 IntaraecUona) ____ 1 Stopping Rules: I--------- - Anthophyllite 11= Malrii NSD= No Structure* Detected [ >30 s/C,0. or in 1st 4 G.O. Tremolite Actinolite Non-Idenlified L:\DATA\PRIVATS\MlK8C\CADD\rEUa fl/22/9e

CITY_21MC100_003099640

NYC-WTC_000182579