NYC-WTC_000209888

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LA£ GROUP 4: Lab Samcle Me mn Opera-.; Client Sol .No Liter Area ’35 ■nm 2

Znstrumenc ■M I'j GRX Grid Orsk No iYagnLiLcacLcn Ar Commenc Acc. Voibaye 8 0 k7 No. GO cc be Anal/zed Oorscd

structure Tn-1 Length I.D. of Structure N or EDS t GO. ■ (Nonasb. [ No Coord. No. >0.5 um i Ei B C M < 5 um » Sum ichrys.j Amphibole Nonasb. lAmbig./ND Elements) /

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(!___!________ ____ I it Photo No. (from i in 5 asbestos- Identify all atructures uaing SDS Check diffraction for aabealoa Store all unrepeated spectra—*" containing samples) Grid acceptance:! structures up to TOs/t^m (lit 4) <50% undiaaolved biller, overlapped or folded Struct 3 > O.Sum Ie > 5:1 Aspect Ratio COX particulate coverage >S0X coverage Totals. Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded ar overlapped grid squares ,^= Positive diffraction pattern properties conforming <5X holes or opaque areas F B C M > Sum to laboratory identification criteria observed. Por ehryaotile: O.TSnm soacini for (020) raflections. 'Unused portion af filler Chrysotile — [ Q.&Snm spacing for the layer line repeat, stroaking -Avoided portion of (110) and (130) reneeUona. of ruler Por amphiboles: O.SSnm layer line repeat, and approa. {2jnin wide) 3.3 ratio of non-twinned layer line spot spacing to Amphibole layer Una repeat distance (O.SSnm).

EOS spectrum conforming to laboratory Ambiguous identification criteria observed. AaVIPHIBCLSS F- Single Fiber (1-3 interaections = 1-3 fibers) Amoaite B- Bundle (>3 flben <1 fiber diameter apart] C= Cluster (>3 intersections! 25mm mUr Crocidolite Non-asbestos! k- Matrix J SlapptRg Rules: -------- Anlhophyllile ! >50 i/G.O. or in lai 4 G.Q. MSDs No Structurei Detected IcSu 1 Non-Identified | L\ DATA\ PRIVATE\ MIKECX CADDMEMO 2/22/98

CITY_21MC100_002849265

NYC-WTC_000209907