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

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP #: 5725 - iC./18/QX

Lab Sample No. Filter Type mm Ccerator Al (r Filter Area Glie.-it Spi.

Inst rumsjnt I -D No

EM iO TRX Grid I.D. ,., sw Disk No

Scre±u Magnificac-on i.6.4C0X (GO) Area 0.01124 mm"? Ccmment s

Acc. Voltage 8J <V No. GC "c be .Analyzed 7 Struct s / mm

GO. structure Structure Type Length I.D. of Structure EDS >0.5 urn (Nonasb. No Coord. No. FB C M > Sum Chrys. Amphibole Nonasb. Ambig./ND Elements) < 5 um I £2. 7

s /i

i i

_________1______________ ___J_________ _________ store all unrepeated spectra—^ Photo No. (from 1 in 5 asbestos- Identify all structures using EDS Check diffraction for eabestoa containing samples) Grid acceptance: I Htructurea up to TOa/^n (l«l 4) <50Z undisBotved filter, overlapped or folded Struct, = > O.Sum de > 5:1 Aspect Ratio <10X particulate coverage >50X coverage N= Not Observed (EOS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Totals <5X holes or opaque areaa Positive diffraction pattern properties conforminK F B C M > Sum to laboratory idenliflcaticn criteria observed. -Unuaed portion of filler For chrysotile: Q.73nm ipacin< (or (020) reflactlona, O.SOnm spacing for the layer line repeat, streaking Chrysotile tvoided portion of (210) and (130) rcflecUona. or rnur Per amphibolas: 0.53nm layer Une repeat, and approx. (2mm wide) 3.5 ratio of non-twinned layer line spot spacing to Amphibole layer line repeat distance (O.SSnm).

v/= EIIS spectrum conforming to laboratory identification criteria observed. AMPHIBOLES Ambiguous F= aiifle Fiber (i-3 intersecbone s 1-3 fiben) Amosite 0= Bundle (>3 fibers <1 fiber diameter apart) Cluster (>3 intersections) 25mm filter Crocidolite Non-asbestos -------- 1 Stopping Rules: I------------ U- Matrix Anthophyllite >90 i/C.O. or in 1st 4 C.O. I NSD=: No Slructurex DelecUd Tremolite Actinolite Non-Identified L.-XDAIAXPBIVATEXMlKECXCADD'J'EMa 9/22/88

CONFIDENTIAL, CITY_21MC100_003470147 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

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