NYC-WTC_000188711

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: 5775 - 10/26/01

Lab Sample No. 62363 Filter Type MCE 25 inm Operator Clienc Spl, No. 2 Filter Area 385 mm"2 Instrument I.D. EM 10 CRX Grid I.D Disk No. Screen Magnification 16,4QQX (GO) Area 0.01124 mm"2 Comments Acc. Voltage 8 0 kV No - GO to be Analyzed 4 ( 3.147 Struct. Corspd. to 70 s/mm"2.)

Length I.D. of Structure EDS GO. structure structure Type (Nonasb. No Coord. No. >0.5 um F B C M < 5 um 5um Chrys. Amphibole Nonasb. Ambig./ND Elements) rZ’

3

___________ ________ _ I Photo No. (from 1 in 5 asbestos- Identify all atructurea using EDS Check diffraction for asbesloa store all unrepeated spectra containing samples) Grid accepLance:! structures up to 70a/^m flat 4) <50% undiaaolvea filter, overlapped or folded Struct. = > 0.5um Jc > 5:1 Aspect Ratio <10% particulate coverage >50% coverage Totals Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Positive dlffrsclion pattern properties conforming <5% holes or opaque arena F B C M > Sum to laboratory Identification criteria observed. -Unueed portion Por chrysotile: 0.73nm spaeinc for (020) renactlons. of niter Chrysotile 0.53nm spacing for the layer line repeat, streaking ’Avoided portion of (UO) and (130) reflections. of niter Per BRiphiboies: O.Sanm layer line repeat, and approx. Portion or filter (Zmin wide) 3.9 ratio of non-tvinned layer Une spot ipaelng to lubJecL to Amphibole layer Una repeat dlatanca (O.S3nm). examination

\/b EOS spectrum conforming to laboratory Identification criteria observed. AMPHIBOLES Ambiguous F= Single Fiber (l'-3 Intersections s 1-3 fibers) Amosite B= Bundle (>3 fibers <1 fiber diameter apart) C= Cluster (>3 intersection!) SSmin nllar Crocidolite Non-asbestos Ms Matrix -------1 Slopping Rules: I--------- - Anthophyllite NSDb No Structures Detected [ >S0 i/C.O. or In 1st 4 G.O. Tremolite Actinolite Non-Identified L-\DATA\PRI¥ATE\UIKBC\CAnnVEUa 9/22/98

CITY_21MC100_003082699

NYC-WTC_000188711