NYC-WTC_000209888

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS L--3 3ROUP 4

Lar? Sample Nc . 34 r T-zoa MCE 'Tim Coeracor lenc Spt Nc Are2 3S5

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GO. Structure Structure Type Length I.D. of Structure N or EDS >0.5 um - I (Nonasb. ; No Coord. No. F! B c M > 5um Chrys.i Amphibole Nonasb. Ambig./NC Elements)! < 5 um

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u L Store all unrepealed spectra—^ Photo No. (from I in 5 asbestos- Identify all structures using SDS Check diffraction for aabeatos containing samples) Grid acceptance:! structures up to TOs/i^m (let 4} <S0X undisBOlvea filter, overlapped or" folded Struct. = > Q.dum & > 5:1 Aspect Ratio <IOX particulate coverage >50X coverage Nx Not Observed (SOS spectrum or dlffracuon pattern) at least 20 unfolded or overlapped grid squares Totals <5X holes or opaque areas Positive diffraction pattern properties conforming F B C M > 5um to laboratory identification criteria observed. ■Unused portion of niter j For chrysoUls: a.73nm spaeinf for (020) rsflectlons. 3.33nm tpaeinc for the layer Une repeat, (treaatng Chrysotile of (110) and (130) reftecUons. 'Avoided portion or niter For amphiboles: 3.S3nm layer Uns repeat- and approx. PorUon of filter (2mm widej 3.3 ratio of non-t»lnned layer Une spot spactn< to ' subjeet to examtnatien Amphibole layer Une repeat distance (0.53nm). I, Z- SDS ipectrum conformtnc to laboratory tdcnUflcaUon criteria obaerved. i AMPHIBOLES Ambiguous F= 3ln<ie Fiber (1-3 IntereecUone = 1-3 fibers) J Amosite B= Bundle (>3 flben <1 fiber diameter apart) C= Cluster (>0 intersections) 25mm HlLer i Crocidolite Non—asbestos! k= Matrix stopping Rules: -------- I AnthophyUite NSD= Ho Structures Detected >50 i/G.Q. or in lat 4 G-O. Tremolite Actinolite i Non-Identified j L\OATA\PRlVATE\klKEC\CADD\rEMa 9/22/^90

CITY_21MC100_002849270

NYC-WTC_000209912