TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (aid CooM Sheet Client Name: NYC BOE Volume (liters'): 1923 Lab Group #: 7392 Filter Tvpe / Filter Area: MCE 385 mm* Lab Sample #: 6 Grid Opening Size: 0.01124

Client Sample #: 08 .Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: too KeV # Grid Openings: 4 Analysis Date: 4/13/02

Analysis Performed By: MARK PEYSAKHOV

GO. 1 Structure Structure Type Length ID of structure N or V EDS (Nonadb No F B C M >=05 M Chrys Amphibole Nonasb Ambig/ND No Coord <5m 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 C M >5m ■^= 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 Non-Identified Actinolite I NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_009505413 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000178897