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TEM asbestos air sample data sheet, Sample 1, March 23,

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

NYC-WTC_000181590
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NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 7170 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 1 Grid Opening Size: 0.01124 Client Sample #: 01 Area Examined: 0.04496 mm* GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: too KeV # Grid Openings: 4 Analysis Date: 3/23/02

Analysis Performed By: MARK PEYSAKHOV

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

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Struct = > 0.5p _> 5:1 Aspect Ratio Grid acceptance: V= Positive diffraction pattern properties conforming to <507d 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 >5p 43 EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile ; AMPHIBOLY i 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 I Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO3468683 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181590

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NYC-WTC_000181590Source: NYC Law Department, mirrored locally

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