NYC-WTC_000202622

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. ■ TEM ANALYSIS. LAB GROUP ff ; 5726 - 1O.>'1S/Q1 Lab Semple No. 61673 Filter Type MCE 25 mm Operator Ac- Clienc Sp_. No. Filter Area 385 mu’'2

Instrument I.D. EM IC CRX Grid I.D. Disk No. Screen Magnification 16,4002 (GO) Area 0.01124 mrr/2 Comments Acc. Voltage GO kV No. GO to be Analyzed _4 { 3 14? Struct Corsod. to 70 s/inm''2 )

GO. structure structure Type Length I.D. of Structure EDS >0.5 um (Nonasb. No, Coord. No. F B C M bum Chrys. Amphibole Nonasb. Ambig./ND Elements) < 5 um I e? TEW a ) A /1

t Photo No. (from 1 in 5 asbestos- Identify all structures using EDS Check diffraction for asbestos Store all unrepeated spectra containing samples) Grid acceptance:! structures up to 70s/i?im (1st 4) <S0X undiBBOlvea filter, overlapped or folded Struct = > 0.5um A; > 5:1 Aspect RaUo <10X particulate coverage >SQX coverage Ns Not 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 to iaborstory IdentificaUon criteria observed. -Unused partian Tor chr^oUlc; 0.73nin apacang for (080) r<n«cUana, of fIlUr Chrysotile O.SSnm spactnf far the layer line repeat, itrealnng of (110) and (ISO) reftectlona. .tvotded poruon «r niter Tor amphiboles: O.a3nm layer line repeat, and approx. |2min wide) 3.S ratio of non—twinned layer Une spot spaeing to Amphibole layer Une repeat distance (O.Santn). vZs EDS spectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous P= Single Fiber (1-3 Intersections = 1-3 fibers) Amosite B= Bundle (>3 fibers <1 fiber diameter apart) C= Cluster (>3 intersections) 2SmRi niter Crocidolite Non-asbestos ------- Slopptnc Rule.: I------- . Anthophyllite M= Matrix r NSD= No Structures Detected >5D i/C.Q. or in l.l 4 C.O. Tremolite Actinolite .\on-ldentified L-\DATA\PRIVATE\MlKEC\CAD0\rE»(3 9/22/98

CITY_21MC100_003273907

NYC-WTC_000202622