NYC-WTC_000177640

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS Lab Sample No. LAE GROUP #; LO '50/

Filter Ty-pe MCE 2 b mm A/A 31 Spl. Nc 'licsr Area 3 S 5 mm Ins-.rument CRX Grid I.D. L’lSk No.

Senser. Magnificat.ior. l(;.400X (GO) Area 0.D1124 mni Comments Acc . Vcitage CO kV No. GC cc oe Analysed 4 3.147 Sbrucr. ■ Corspd s Zaur/2

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

-J

Store all unrcpealed spectra—^ Photo No, (from 1 in 5 asbesLos- IdenLify all atructures using EDS Check diffraction for asbesLoa containing samples) Grid acceptance;! structures up to TOs/^m (let 4) Struct = > 0.5um & > 5:1 Aspect Ratio <50% undisaolvea filter, overlapped or folded

Ns <10X particulate coverage >50X coverage ‘fot Observed (EOS apectrum or diffraction pattern) at least 20 unfolded or overlapped grid aquarea Totals <SX holes or opaque areas F B C M > Sum n ys I'oaiUve dlffrscLlon pattern properties conforming to laboratory identification criteria observed. -Unused portion Tor chry«oUl«; Q.73nm ■pvclne for (020) reflection!. of filter Chrysotile | (LflOnm spacing for the layer line repeat, stresking -Avoided portion C'f (110) and (130) reflecLoni. of filter For amphiboles: O.SOnm ayer line repeat, and approx. (Zmm wide) S.3 ratio of non-tvlnned saver line spot spacing to Amphibole liyar Une repeat dlsLanee (0,.’>anni).

>/= EDS apectrum conforming to laboratory hientiflestion criteria observed. AMPHIBOLES Ambiguous P= Single Fiber (1-3 intersections = 1-3 fibers) Amosite B= Eundle {>3 fibers <1 fiber diameter apart} C= Cluster {>3 intersection! aSmtn niLar — ,,.,i Stopping Rulea; L—_ Crocidolite Non—asbestos Ms Matrix Anthophyllite >50 a/G.O. or in lat 4 C.O. Tremolite NSD= No Structures Detected Actinolite Non-Identified L\D/TA\PBrVATE\MIKEC\CADD^TEM3 S/2Z/B8

CONFIDENTIAL, CITY_21MC100_003473539 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177640