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

NYC 9/11 Public Portal Document

ATC ASSOCIATES INC. TEM ANALYSIS LAB GROUP tl ; 10/ iR/'OI

Lab Oanple No 6163 & Filcer MCE /~ mm Operator

Client Spl. No. ££ Area 385I mirC? Inscruineuc I.D. EM 1C.. CiYX Grid I.D. Y6 .L 3-Z/k Disk No.

Screen Magnification 400X (GO) Ares 0 . 01124 Comments

Voltage 8 0 kV NO . CO De Analy'zed 147 Struct. Corsod C 5/m[Ti^2

EDS ___ structure Structure Type Length I.D. of Structure >0.5 um (Nonasb. No Coord.i No. F B C M > bum Chrys. Amphibole Nonasb. Ambig./ND Elements) < 5 um 'Vzl /1/5Z9 J Hy 'I

3^

1 Photo No. (from 1 in 5 asbestoa- Identify all atructurea using EDS Check diffraction for asbestos Jstore _______ !_______H all unrepeated spectra--^ containing samples) Grid acceptance:! structurea up to 7Qs/i’Am (Ist 4) Struct.. = > 0.5um & > 5:1 Aspect Ratio <50X undisBolvea filter, overlapped or foidea <10X particulate coverage >50X coverage N= Not Observed (EDS spectrum or diffraction pattern) at least 20 unfolded or overlapped grid squares Totals <5% holes or opaoue areas Positive diffraction pattern properties conforming F B C M > Sum to laboratory identification criteria observed. ■Unused portion Por chrysotile: O.TSnm spacing for (020) rsfleeUons, Of niter I I I O.tOnm spacing for the layer line repeat, streaking Chrysotile at (110) and (130) reflecUona. ‘Avoided portion of filter For amphiboles: O.S3nm layer tine repeat, and approx. Portion of filter (Hmm wide) 3.S ratio of non-Lwinned layer Une spot spacing U> subject to szantinaUoQ Amphibole layer Une repeat distance (3.S3nm).

'= EDS apectruni conforming to laboratory Identiricatian criteria observed. AMPHIBOLES Ambiguous F= Single Fiber (1-3 Intersections = 1-3 fibers) Amosite B= Bundle (>3 fibers <1 fiber diameter apart) 2Smm fllUir Crocidolite Non-asbestos C= CRster (>3 intersections) _______ - Stopping Rules: I . Anthophyllite H= Matrix NSD= Mo Structurea Detected >50 s/C,0. or in 1st 4 C.O. Tremolite Actinolite Non-Idenlified L\0ATA\PRIVATE\M!KBC\CADD^yEM3 0/22/98

CONFIDENTIAL, CITY_21MC1OO_OO347O142

SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176425