NYC-WTC_000182599

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP I?: 5775 - 10/26/Ql

Lab Sample No. 62362 Filter Type MCE 25 mm Client Spl. No. 6 Filter Area 385 mm'^2 Instrument I.D. EM 10 CRX Grid I.D. Disk No.

Screen Magnification 16,400X (GO) Area 0.01124 mm"2 Comments ACC. Voltage 00 kV No. GO to be Analyzed 4 ( 3.147 Struct. Corspd. to 70 s/mn^2.l

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

store all unrepeated spectra 9 Photo No. (from 1 in 5 asbesLos^ Identify all structures using EDS Checkc ___________ diffraction for ____ asbestos containing samples) ICrid acceptance: I gtruclures up to TOs/Am (l.t 4) <50X undisaolvea filter, overlapped or foldeo Struct. = > O.Sum at > &:1 Aspect Ratio <10X particulate coverage >50X coverage Totals N« Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares <5X holes or ooaoue areas F B C M > Sum Positive dlffracUon pattern properties conforming to laboratory Identification criteria observed. •Unused portion Por chrysotlla: D.73nm spaelnc for (020) renecUon*. or niUr Chrysotile 0.53nm spacing for the layer line repeat, streaking 'Avoided portion of (HO) and (l30) reflections. of filter Per amphiboles: 0.53nm layer line repeat, and approx. Portion of filter (Smnn wide) ' 3.5 ratio of aos-tvlnned layer line .spot spaelnc to subject to examination Amphibole layer line repeat distance (O.SSnm). v/= 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) ZSmni niter Crocidolite Non-asbestos J Slopping Rules: I—— Anthophyllite Mb Matrix NSD= No Structures Detected U\ DATAXPRIVATEXMIKBCXCADDVEMa [ >50 s/C.O. or In IsL 4 G.O. Tremolite Actinolite Non-Identified 0/22/98

CITY_21MC1OO_OO3O99857

NYC-WTC_000182599