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TEM asbestos air sample data sheet, Sample 3, March 23,

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Technical data sheet recording laboratory parameters and microscopy details for the third air sample analyzed on March 23, 2002.

NYC-WTC_000181592
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NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 7170 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 3 Grid Opening Size: 0.01124 Client Sample #: 03 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/23/02

Analysis Performed By: MARK PEYSAKHOV

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

JI

J i

Struct = >0.5p >5:1 Aspect Ratio Grid acceptance:

Positive diffraction pattern properties conforming to <50% undissolved filler, 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 EDS spectrum conforming to laboratory holes or opaque areas identification criteria obsenred Chrysotile AMPHIBOLES j Amphibole F = Single Fiber Amosite B - 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 Delected

CONFIDENTIAL, CITY_21MC100_003468685 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181592

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NYC-WTC_000181592Source: NYC Law Department, mirrored locally

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