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TEM Asbestos air sample results, NYC BOE, Feb 2002

Machine-extracted title · confidence 95%

Laboratory report documenting transmission electron microscopy analysis of air samples collected by the NYC Board of Education on February 16, 2002.

NYC-WTC_000181091
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NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 6698 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 10 Grid Opening Size: 0.01124 Client Sample #: 10 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20.000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/16/02

Analysis Performed By: MARK PEYSAKHOV

GO^ Structure Structure Type Length ID of Structure NorN \ EDS No F B C M >=5p Chrys Amphibole Nonasb No Coord <5m j Elements)

Struct = > 0.5g > 5:1 Aspect Ratio Grid acceptance: ■/= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratoy idenfification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overtapped grid squares <5% F B C ' M >5c EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile i AMPHIBOLES j Amphibole F = Single Fiber Amosite 8 = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003467965 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181091

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NYC-WTC_000181091Source: NYC Law Department, mirrored locally

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