TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Porta[ Document

TEM Asbestos (airl Count Sheet Client Name: NYC BOE Volume (liters): 1736 Lab Group #: 7386 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 9 Grid Opening Size: 0.01124 Client Sample #: 11 Area E.xamined: 0.0562 mm* GRID BOX: Magnitication: . 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 's Analysis Date: 4/11/02 ■Analysis Performed Bv: ^7

ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or ^f EDS No >=05 u (Nonacb F B C M Chrys Amphibole Nonasb Ambig/ND No Coord <5u Elements)

3^1 iT •7 If -4If__ ::,7 -----

Siruct = >0.5p >5:1 Aspect Ralio Grid acceptance: nl= Positive diffraction pattern properties conforming to "^50% undissolvsd filter, overtapped or folded Totals laboratory identification criteria observed <10% partculate coverage >50% coverage ate

v'= EDS spectrum conforming to laboratory least 20 unfolded or overlapped grid squares <5% holes or opaque areas fF B C M >5tJ

identification criteria obsenjed Chi-ysotile AMPHIBOLES Amphibole i F = Single Fiber Amosite S = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbeslos Tremolite M = Matrix Actinolite Non-Identilied- NSO = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO95O5392

SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000178887