TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

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TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volumejlitersi: 1840 Lab Group #: 7534 Filter Type / Filter Area: MCE 385 mm’ Lab Sample #: 9 Grid Opening Size: 0.01124

Client Sample #: 09 Area Examined: 0.04496 mm’ GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 AnalysisJDate: 4/25/02

Analysis Performed By: MARK PEYSAKHOV

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

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Struct = > (J.5u >i:l 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 I C i M j >50 v = EDS spectrum conforming lo laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle l<3 fibers <1 fiber diameter apart Crocidolite Ambiguous j I C = Cluster I >3 Intersections) Anthophyllite Non-Asbestos \ Tremolite M = Matrix Non-Identified i Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471282 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177073