NYC-WTC_000188676

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: 5735 - 10/20/01

Dab Sample No. 6172 Filter Type MCE 25 mm OperaLcr 1’ ? 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' Comments Acc. Voltage 80 kV No. GO to be Analyzed _4 ( 3.147 Struct. Corspd. to 70 s.''mm"2.1

GO. structure Structure Type Length I.D. of Structure N or EDS >0.5 urn (Nonasb. No Coord. No. F B C M

e < 5 um > Sum Chrys. Amphibole Nonasb. iAmbig./ND Elements) f 2^

1 4

Photo No. (from 1 in 5 aabeatoa- Identify all structures using EDS Check diffracUon for aabeatoa store all unrepcated spectra containing samples) Grid acceptance:!, structures up to 70a/Am (l-t ■*) <50% undissolvea filter, overlapped or Voided Struct. = > 0.5um & > 5:1 Aspect Ratio <10X particulate covcraie >50% coverage Totals Ns Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares ^/s Positive diffraction pattern properties conforming <5% holes or opaque areas_____________________________ F B C M > Sum to laboratory Identification criteria observed. Inused portion Fer chrysotile: 0.73nm spaein* for (020) rofleetiont, 0.53nm ipacina for the layer line repeat, streaklnc or niter Chrysotile kvoldsd portion of (HQ) and (130) reflecUona. of niLar For amphiboles: 0.53am layer line repeat, and approx. Portion of niter (2mm wide) 3.5 ratio e( non-twlnned layer Uno spot spacing to vabjeet to examination Amphibole layer Una repoat distance (0.53nm).

EDS spoetrum conforming to laboratory Identification criteria observed. AMPHIBOLES Ambiguous P- Single Fiber (1-3 IntereecUone s 1-3 flbera) Amosite B= Bundle (>3 fibers <1 fiber diameter apart) C= Cluster (>3 iRterseetiona) " SSmin niter Crocidolite Non—asbestos Us Matrix -------- i stopping Rules: 1------------ Anthophyllite NSD= No Structure! Detected >50 a/C.O. er In 1st 4 C.O. Tremolite Actinolite Non-Identified U\&ATA\PIUVtTE\MIXEC\CJlDD^Ha 9/22/Oa

CITY_21MC100_003082431

NYC-WTC_000188676