TEM asbestos air sample results, NYC BOE, May 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count She^t Client Name; NYC BOE Volume [insrs); 1928 Lab Group #: 7700 Filter Type/Fttter Area: MCE 385 mm" Lab Sample #: 21 Grid Opening Size: 0.01124 Client Sample #: 21 Area Examined; 0.04496 mm" GRID BOX: Magnification^ 20,000 GRID DP: 3 Accelerating Voltaye: 100 KeV # Grid Openings: 4 Analysis Date; 5/11/02

Analysis Performed By: MARKPEYSAKHOV

GO. Structure Structure Type Length ID of structure NorV EDS No (Nonadb F B C M >=05 p >=5p Chrys Amphibole Noiaab , AmbijffC Elements) No Coord <5p

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3

Struct = >0.5p > 5:1 Aspect Ratto Grid acceptance: '/= Positive diffraction pattern properties conforming to <50% undissolved filter, overtapped or folded Totals laboratory identification criteria observed <10% particulala coverage >50% coverage ate least 20 unfolded or overtapped grid squares <5% F B C M >5m •J- EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Nou-Identified Actinolite NSD = No Structures Detected

CITY_21MC100_003092079

NYC-WTC_000192008