NYC-WTC_000188618

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAH GROUP 554 09/21 '01

Dei Sample No. 59303 Filter Type MGS 25 tnrr. Opera” L Cu / :nt Dpi. No. NSKS-liMS-? 3S5 mm*2 trument I.D. EM 10 CPO: Grid I.D. L//S~ /4€ Disk No. Screen Magnification 16,4Q.0X (GO; Area 0.01124 mrr. ■Oonmenos Acc. Voltage 8 0 kV No. GO to he Anai/red --i~ Struct Corspd. to 70 3/rnni*3 - 1

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 aabestoa— Identify all atructuresusine^^S Check diffraction for aabestoa Store all unrepeated, spectra containing sampiea) Grid acceptance:! atructurea ut> to 70a/nim (l»t -i) <50X undisaaiveiT filter, averiapped or folded Struct. = > O.Sum k > 5:1 Aspect Ratio <1QX particulate coverage >60X coverage N= Not Observed (EDS spectrum or diffracUon pattern) at leaat 20 unfolded or overlapped grid squares Totals Posibve diffraction pattern properties conformlnc holes or ooaoue areas F B C M > Sum to laboratory Identification criteria observed. Unused portion For chrysotile: 0.73nm loacinr for (020) peflactlona. of niter Chrysotile Q.50nm apaeinc fs** the layer line repeat, itreakinc Avoided portion of (110) and (130) reflecUona. o< niLsr For tmphlbolea: a.Mnm layer Une repeat, and approx. (Zmm wide) 3.5 ratio of non-twinned layer Une ipot apacinc La Amphibole layer Une repeat dletanca (Q.ianm). v/= SDS spectrum conforming to laboratory idenUflcaUon criteria aba«rv«u. AMPHIBOLES Ambiguous F* Single Fiber (1-3 tnteraecUona = l*-3 fibers) Amosite 3= Bundle (>3 fibers <1 fiber diameter apart) C= Cluster \>C Intersections) f 25mm flltar Crocidolite Non-asbestos J 3Laqpin( Rules: Anthophyllite U= Matrix r >50 t/C-O. ar in I st 4 G.Q. Tremolite NSD= No Structures Detected I AcLinoiite Non-Identiiied L\DATA\PR!V*7r\J(IICSC\CADD'5'£«3 8/22/90

CITY_21MC100_003081960

NYC-WTC_000188618