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

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LA5 GROUP fc;.&69e - 10,'lS/01 Lab baTiple No. 613 41 Filter Tvpe MC? mrr A' Client, spl. No. .er Area 333 mm Inscrumenc I.D EM 1o CRX Grid I.D No . •Screen Maanificac..cn ?*- 4COX iGO: Area 0.01 nini Gommencs Acc. Voicage 3 0 kv No. GC co be Analyzed 4 3.14" Scrucc Cersod - “ C s mrr. * 2 . )

Job: structure structure Type Length I.D. of Structure EDS >0.5 um (Nonasb. No Coord. No. F B C M <' fi nnn 5um Chrys. Amphibole Nonasb. AmbigYND Elements) /

(LJ ___ J______ i-. j Photo No. (from 1 in 5 aaoeatoa- Identify all structures using EDS Check diffraction for asbestos J_________ J) Store all unrepeated spectra—^ containing samples) Grid acceptance:! structures up to TOs/i^m list 4) Struct. - > O.Sum & > 5:1 Aspect Ratio <5CX undissolved filter, overlapped or folded <10X particulate coverage >S0X coverage N= Nut Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Totals <5X holes or ooscue areas Pcialttve diffraction pattern properties conforming F B C M > Sum Le laboratory identification criteria observed. ■Unua«d psrUon For chrysotile: O.TSnm spacing for (020) ranscUens, O.liOnm spacing for the layer line repeat, streaking of (110) and (130) reflecUons. of niter •Avoided portion or niter Chrysotile “I III Per amphiboiea: 0.&3nm layer line repeat, and approx. PorUon of filter {Zmm wide) 3.0 ratio of non-l«inned layer line spot spacing Le lutajecl to «x«mlnation Amphibole laj'er line repeal dlalanee (d.SSnm).

EDS spectrum conforming to laboratory Ambiguous id<intjflcatlon criteria observed. AMPHiBOLES F= Single Fiber (1-3 intersections = i-a fibers) Amosite 0= Bundle (>9 fiben <1 fiber diameter apart) C= Cluster (>3 intersections) 28mm filter J Slapping Ruiesi 1---------- - Crocidolite Non—asbestos M= Uittrix Anthophyllite NSD= No Structures Detected >M ./C.O, or In l.t 4 C.O. Tremolite Actinolite Non-Identified L!\DATA\PWVATB\MllCSC\CADD'?'EMa 9/ZZ/9S

CONFIDENTIAL, CITy_21MC100_003470051 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176421