NYC-WTC_000202623

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS. LAB GROU.i’ ti : 5726 - 10/18/01

Lak Sample No. 61G79 Pi leer Type MCE 2S -mn Operator. Me- Clcent Sol. No. 24 Pilcer Area 355 Instrument I.D. EM IC CRX Grid r.D Disx. No. Screen Magnification 16,40QX (GO) Ares 0.011.24 mm'^2 Comments Acc. Voltage 3 0 kV No. GC to be Analysed ( 3.147 Struct. Corspd. tc 70 s/mm^S.)

Length EDS LD. of Structure GO. Structure structure Type (Nonasb. No. Coord. No. ^0.5 um FB C iM < 5 um Sum Chrys.f Amphibole ' Nonasb. Ambig./ND Elements) 7]ZW 7 H II i\ T if

Photo No. (from 1 in 5 asbestos- Identify all strueturea using EDS Check diffraction for asbestos Store all unrepeaLed spectra— containing samples) end acceptance: I structures up to TOa/^m (l"t 4) Struct. = > 0.5um A: > 5:1 Aspect Ratio <50% undiasolvea filter, overlapped or folded <10X particulate coverage >50X coverage N= Not Observed (EDS spectrum or diffraction pattern) at lent 20 unfolded or overlapped grid squares Totals Positive diffraction pattern properties conforming <6S holes or opaque areas F B C M > Sum to laboratory identification criteria observed. ■Unused portion i i Por chryaotOes C.73nm apaeinf for (020) reflecllona, O.sanm spacing for Ute layer line repeat, alreaking of (110) and (130) refleeUens. of filter Avoided portion of filter Chrysotile 1 For amphlbolee: Q.SSnm layer line repeat, and approx. Portion of filter (Smm wide) 3.5 ratio of non-twinned layer line spot apacini to subject te Amphibole layer Une repast distance (O.SSnmJ. examination

\Z= EDS ipectrum eonformini to laboratory Ambiguous identifleatian criteria otaaerved. AMPHIBOLES F= Single Fiber (1-3 InLeroections = 1-3 flben) Amosite B= Bundle (>3 flben <1 fiber diameter apart) C= Cluster (>3 interseeUoas) ZSmni filter Crocidolite Non-asbestos ■ .1 I Slopping Rules: I------- Anthophyllite U- Matrix I >50 a/C.O. or In lai 4 C.O. Tremolite NSD= No Structures Detected Non-Identified UXDATAXPRlVATEXMlKECXCADD^TEMa Actinolite 9/22/98

CITY_21MC100_003273908

NYC-WTC_000202623