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

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LABGROyP#j5730-10/15ZCl

Lab Sample No. £ 1710 Filter Ty'pe MCE 2 5 mm Operator Client Spl- Nc. 20 Filter Area 385 mm"2 Instrument I.D. EM ID CRX Grid I.D. 5S7 Disk Nc. Screen Magnification 16,40QX (GO) Area 0.01124 mm'*2 Comments, Acc. Voltage 8 0 kV No. GO to be Analyzed 4

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

o F-

Photo No. (from 1 in S asbestos- Identify all atructuree using EDS Check diffraction for aabeatoa Store all unrepeaLed spectra containing samples) Grid acceptance;! structures up Ito 7aa/i?im (l»l 4) <S0X undlssolved niter, overlapped or' foldea struct a > D.Sum k > 5:1 Aspect Ratio <10X particulate coverage >50X coverage Totals Ns Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Positive diffraction pattern properties eoaforming <SX holes or ODaoue areas F B C M > Sum to laboratory Identification criteria observed. -UnuMd porUoB For chrysotile; 0.7Snm ■pacing for (020) reflections, of niur Chrysotile 0.03nm spacing for the layer line repeat, streaking Araldm porUan of (110) and (130) renecUena. of nitot Por amphiboles: O.a3nm layer Une repeaU and appro*. PorUon of nitar (2mm wide) 3.9 ratio of nen-t«innsd layer line spot spaeing to subject to Amphibole layer Une repeat disUocs (O.Mnni). axaminaUoa

EOS spectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous F= Single Fiber (1-3 Lntereections a 1-3 fibere) Amosite Ba Bundle (>3 fibers <1 fiber diameter apart) ZSmm niter Crocidolite Non—asbestos C= Cluster (>3 IntenecUons) I I stopping Rules: I .. Anthophyllite M= Matrix >90 i/C.O. or in lat 4 G.O. Tremolite NSD- No StrueturoB DoUeUd Actinolite Non-Identified L;\DATA\PiaVATE\MIK2C\C*DDVXlia 9/22/80

CONFIDENTIAL, CITY_21MC100_003470200 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176438