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TEM grid data sheet, sample 1, Jan 2002

Machine-extracted title · confidence 95%

Technical data sheet recording transmission electron microscopy parameters and observations for the first asbestos air sample analyzed on January 22, 2002.

NYC-WTC_000175804
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NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet ■Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 6398 Filter Type / Filter Area: MCE 385 mm’ Lab Sample #: 1 Grid Opening Size: 0.01124 Client Sample #: 01 .A.rea Examined: 0.04496 mm’ GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 1/22/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Norv EDS No >=05 u Amphibole Nonasb (Nonadb F B C M Chrys Ambig/ND No Coord <6m Elements)

Struct = > 0.5(1 >5:1 Aspect Ratio Grid acceptance: '/= Positive diffraction pattern properties conforming to <50% undissolved filter, overiapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overiapped grid squares <5% F B C M >5u EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile ' AMPHIBOLES 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 Detected

CONFIDENTIAL, CITY_21MC100_0 03433516 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175804

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NYC-WTC_000175804Source: NYC Law Department, mirrored locally

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