TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 7455 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 1 Grid Opening Size: 0.01124

Client Sample #: 01 Area Examined: 0.04496 mm’

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/18/02

Analysis Performed By: MARK PEYSAKHOV

GO Structure Structure Type Length ID of Structure N or EDS ; (Nonadb No F B C M >=05 p Chrys Amphibole Nonasb Ambig/ND No Coord Elements) ; <5U

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Struct = > 0,5n > 5:1 Aspect Ratio Grid acceptance:

v= Positive diffraction pattern oroperties conforming to <50% undissolved filter, overlapped or folded Totals laboratory deniiiicaticn criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F j B j C pl >5u \= EDS spectrum conforminc to laboratory- holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite a = Bundle i<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified i Actinolite NSD = No Structures Detected I

CONFIDENTIAL, CITY_21MC100_003471126 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176964