TEM Asbestos air sample results, NYC BOE, Feb 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 6598 Filter Type / Filter Area: MCE 385 min- Lab Sample #: 6 Grid Opening Size: ■0.01124 Client Sample #: 06 Area Examined: 0.04496 mm* GRID BOX: Magnification: 20,000 GRID ID: <5 aS <3 Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/8/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Nor \ EDS No (Nonadb F B C M >=06 p :>=5(J Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

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Struct = >0.5p >5:1 Aspect Ratio Grid acceptance: Positive diffraction pattern properties conforming to "50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed " 10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B M ■7= EDS spectrum conforming to laboratory C >5p 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) j Anthophyllite Non-Asbestos M = Matrix i Tremolite Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO3467796 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180967