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TEM Asbestos air sample results, NYC BOE, Mar 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.

NYC-WTC_000180418
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NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1928 Lab Group #: 7162 Filter Type / Filter Area: MCE 385 Lab Sample #: 18 Grid Opening Size: 0.01124 Client Sample #: 18 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/21/02

Analysis Performed By: MARK PEYSAKHOV

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

J?

Struct = > 0.5)1 >5:1 Aspect Ratio Gnd 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 >5|j EDS spectrum conforming to laboratory holes or opaque areas Identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 libers <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_003466970 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180418

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NYC-WTC_000180418Source: NYC Law Department, mirrored locally

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TEM Asbestos air sample results, NYC BOE, Feb 2002

NYC-WTC_000180877

Laboratory report documenting transmission electron microscopy analysis of an air sample collected from a New York City Board of Education site on February 2, 2002.

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