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

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAS GROUP #; Lab G.^mple No Fil Type MCE 2S mrn Operator en: Spl No Of Filter Area 28: min' Insorumanc. I.D CM It CRN Grid I.D. V-C..___ Disk No Sci-sen Magnifr.cacion IAlEOO!^ (GO.! Area 2.01124 mm*2 Commenos Acc. Volcage 3C No. GO to be Analyzed 4“ Siruci zorspe. oc 7' s.^mm'

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

A'3

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Store all unrepeated spectra-^ Photo No. (from 1 in 5 asbestos- Identify all atructurea using EDS Check diffraction for aabealoa containing samples) Grid acceptance;! struclurea up Lo 70s/l^m (l>t ♦) Struct - > O.Sum & > 6:1 Aapect Ratio <5CX undiuolved filLer. overiapped or foldea <10X particulate coverage >S0X coverage Nb Not Observed (EDS Bpectrum or dlffraetien pattern) at least 20 unfolded or overlapped grid aquarea Totals PeaiUve diffrection pattern properties coaforming <SX holes or opaque areaa F B C M > 5um to laboratory identification criteria observed. ■Unuwd portion for chrysoUie: 0.73nm ipaeing for (020) ranecUons. Of niter Chrysotile C.SSnm spacing for ths layer line repeat, streaking ■Avoided partioa cf (no) and (ISO) reneebena. of niUr For amphtboiex; O.SSnin layer Une repeat, and approx. Portion of niter (Zmm wide) 2.8 ratio of non-tvinned layer line spot spacing to ■ubjvct to examination Amphibole layer line repast distance (O.SSnm). \/b EDS spectrum conforming to laboratory iilenUfleation criteria observed. AMPHIBOLES Ambiguous P= single Fiber fl--3 inLervectione = 1-3 fibera) Amosite B= Bundle (>3 flberx <1 Hber diameter apart) 25mm HI Ur Crocidolite Non-asbestos C= Cluator {>3 interaecUona) Ms Katrix NSD= No Struclurea OetocUd L;\D*TA\PWVjiTE\MIKSC\CADDVEM3 t >80 9/22/98 Stopping Rules: I--------- - s/C.O. or in ist 4 C.O. Anthophyllite Tremolite Actinolite Non-Identified

CONFIDENTIAL, CITY_21MC100_003470189 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176437