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TEM Asbestos air sample results, NYC BOE, Apr 2002

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Laboratory report documenting transmission electron microscopy analysis of an air sample collected from a New York City Board of Education site on April 4, 2002.

NYC-WTC_000176758
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NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 7325 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 5 Grid Opening Size: 0.01124

Client Sample #: 05 Area E.xamined: 0.04496 mm^

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

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Norv EDS (Nonadb No F B C M >=05 p i>=5m Chrys Amphibole Nonasb Ambig/ND No Coord Elements) <5|J

Struct = > 0.5p >5:1 Aspect Ratio Grid acceptance: 7= Positive diffraction pattern properties conforming to '50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed r Am M M AiXmm A. MM ms'iAmmm <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F BjC M >5u '/= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Clirysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos T remolite M = Matrix Non-Identified Actinrolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO347O823 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176758

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NYC-WTC_000176758Source: NYC Law Department, mirrored locally

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