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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 3, 2002.

NYC-WTC_000176753
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NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name; NYC BOE Volume (liters?. 1800 Lab Group #: 7314 Filter Type / Filter Area: MCE 385 mm" Lab Sample #: 12 Grid Opening Size: 0.01124 Client Sample #: 12 Area Examined; 0.04496 mm" GRID BOX: Magnification: 20. SOS GRID ID: Accelerating Voltage: 100 KeV if Grid Openings: 4 Analysis Date: 4/3/02

Analysis Performed By: MARKPEYSAKHOV

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

Struct = > 0.5n >5:1 Aspect Ratio Grid acceptance: Positive diffraction pattern properties conforming to *5®^ undissolved filter, overlap^ or folded Totals laboratory identificauon criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overiapped grid squares <5% F B C M >5p V= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile : AMPHIBOLES 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_003470808

SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176753

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NYC-WTC_000176753Source: NYC Law Department, mirrored locally

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