Asbestos TEM analysis results, New York City schools, Oct 2001

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAS GROUP if 5 6?^1

Lab Sample No. 510'’.. Filter Type MCE 25 mm Operator

Client Spl. No NSHS-EIR-10/14-05 Filter Area 3B5 mm"2 Instroment I.D. 3M 1''' CRN Gric I.D. c/T^ Orsk No Screen Magnification 16,400X {GO) Area 0.01124 mm"2 Comments

Acc. Voltage kP' No. GO to be Analyzed _4 3.147 Struct. Corsod s/nr.'Ti'

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

7 Zi

3. (i 1 Ba..

■ Photo No. (from 1 in 5 asbestos- Identify all structures using EDSCheck diffracUon for aabeatoa . ...Jj Store all unrepeated spectra—^ canLaining samples) structures up to 70a/:^m Grid acceptance:!, (l»t 4) <50% undiaaolved filler, overlapped or folded Struct =- > 0.5um ft > 5:1 Aspect Ratio <10% particulate coverage >50% coverage Ns Hot Observed (BDS ipeclrum or diffraction pattern) at leaat 20 unfolded or overlapped grid aquarea TotaJa Positive diffraction pattern properties confarming <5% holea or opaque areaa____________________ F B C M » 5um to laboratory idenUIicatlon criteria observed. 'Unused portion of Filter for chrysotile; 0.73nm spadne For (020) reflections, C.SOnm spaclnc For ths Is yer line repeat, strosiclnf Chrysotile eF (110) and (130) refleebona. -Avoided portion oF Filter For amphiboles: 0.&3nm layer Une repeat, and approx. Portion of filter (2mm wide) 3.5 retie of non-lvinned isyer line spot spaclnc Bubjacl la examination Amphibole layer line repeat dtsUnco (O.oanm).

BDS spectrum oonformlni to laboratory UlenUfleation criteria observed. AMPHIBOLES Ambiguous P= Single Fiber (1-3 inleracctiens » 1-3 fibers) Amosite Bundle >3 fibers <1 fiber diameter apart) C= Cluster (>3 Intersections) 25mm Fillar I-----------1 Stapplng Rules: 1-------- Crocidolite Non-asbestos Ms hlatrix Anthophyllite NSD= No Struclurea DeUcUd >50 a/G.Q. or In Isl 4 C.Q, Tremolite Actinolite Non-Identified L:\BArA\PRIYATE\MIKBC\CADDVEM3 9/22/M

CONFIDENTIAL, CITY_21MC100_003470021 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

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