NYC-WTC_000202627

NYC 9/11 Public Portal Document

ATC ASSOCIATES. INC. TEM ANALYSIS LAS GROUP It : 10/ 0 9 01 Lab Sample- No. 80704 r Gyps MC3 2 5 mm Opcracor t tt-/^ terne Spl- Mo. MBHS-3>g-10/9-L2 Fiicer .Area S85 mm"2 Insccuinenc I.D. EM-IC CRX ■Id I-D Disk No. Macnification 16.4G0X (GO) Arsa 0.31124 m[Ti"2 Comments

. Voltage 80 kV No. GO to be AiiaiYsed 3.147 Sttucc. Corsod 70 s/mm''2 . ]

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

z.

A

Store all unrepeated spectra—^ Photo No. (from 1 in 5 asbestos- Identify all atructurea using EDS Check diffraction for aabeslos containing samples) Grid acceptance: I atructuiires UP to Tps/i^m (l«t 4) <50X undissoivea niter, overla)ipped or foliiad Struct. = > Q.Sum ft > 9:1 Aspect Ratio <10X particulate coverage >SOX coverage N= Nat Observed (EDS apeetrum or dlffracUon pattern) at leant 20 unfolded or overiapped grid aquarea Totals FostUve dUfracUon pattern properties conforming <5X holes or opaoue areas F B C M > Sum to laboraUry IdenUflcation criteria ebaerved. -UnuMS aorUen Far ehryaetlla! 0.73nm asaainc far (020) rafleeUsAS. or nitar Chrysotile 0.33nm ipaotng for the layer line repeat, itraaluag -Avoidad portion of (110) and (130) rafleeUona. or nitar For ampniboieas Q.aanm layer Una repeat, and approx. (2mm vids) 3.a ratio of non-twlnned layer line spot ipaalng to Amphibole layer line repeat dlatance (O.sanm). EDS apMtrum «c to laboratory Ambiguous idanUricatlon crttaria observed. AMPHIBOLES P= Single Fiber (1-3 intaraeeUona a 1-3 fIbara) Amoaile a= aundta (>a ribera <1 Hbar dlameUr apart) C= Cluitar l>3 inlaraectiona) 28mm filter Crocidolite Non-asbestos J stopping 3ulaat Anthophyllite U- Matrix T NSD= Na Strueturoe Detaeiod >90 i/G.O. or In lai 4 t C.oNl Tremolite Non—Identified Actinolite U\0ATA\PRIVATS\MIK8C\CADIlV8m 3/22/08

CITY_21MC100_003274230

NYC-WTC_000202636