NYC-WTC_000209888

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LA3 GROUP C

Lab Sample Me 6251- r Type MCE 2 ;nm Opera-, Client SpL. Ng. 03 cer .Area 3 35 mm Inscrumenr. ;.o. EM 10 CRX Grid 1,0 Disk No. Screen Maanifrcacxcn lb.400X (GO; Area 0.01124 mm"2 CcmmeniLs

Acc . Volcage 8C kV Nc. GC HO ce Analyzed _6 4 Ccrscd mn'

GO. structure Structure Type Length I.D. of Structure i EDS ^0.5 um (Nonasb. NoJ Coord. No. F B C M > Sum Chrys.i Amphibole \ Nonasb. Ambig./ND Elements) < 5 um o<- !

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I I Photo No. (from 1 in S asbestos- Identify all structures using EDS Check diffraction for asbestos Store all unrepeated spectra containing samples) Grid acceptance:! structures up to 70s/i?im (in 4) <50% undiasolveo Tnteri^overTappe^o^ToTSe^™™ Struct. = > O.Sum Jt > 5:1 Aspect Ratio <10% particulate coveraje >60% coverage Totals Nis Mol Observed (CDS spectrum or dlffracLion pattern) at least 20 unfolded or overlapped grid squares '= Positive diffraction pattern properties conforming <5% holes or ooaque areas F B C M > Sum to laboratory identification criteria observed. 'Unused portion For ehrysotiis: O.TSnm spactn< for (020) rensetions. O.SOnm spacing for the layer Une repeat, itreaking of (110) and (130) rerteeUona. For amphiboles: 9.93nm layer Une repeat, and approx. ParUon of filler \ of filter kvoided portion of filter Chrysotile I I (3mm wide) 3.3 ratio of non-twinned layer line spot spacing to ■ubject to axaminalion j ' I Amphibole I layer line repeat distance (0.33nm).

> COS apectrum conforming to laboratory \ / ■| Ambiguous j identification criteria obaerved. AMPHIBOLES F= Single Fiber (1-3 interaectiona = 1-3 flbera) AmoaiLe B= Bundle (>3 fibers <1 fiber diameter apart) C= Clustar (>3 intersections) 2amm at Ur lo,...*— a..,__ Crocidolite ; .Non-asbestos| M= Matrix ----------- 1 Stopping Rules: -------- i .Anthophyllite I r NSDs No SLruclurea OetecUd ’/O-O- I Tremolite j „ , , Actinolite Non-ldentified j L;\DATA\PRIVATE\MIKZC\CADD^E«3 3/22/88

CITY_21MC100_002849250

NYC-WTC_000209892