TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Latt^Group^ 7347 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 14 Grid Opening Size: 0.01124 Client Sample #: 14 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/6/02

__ —Analysis Performed By: MARK PEYSAKHOV

GO Structure Structure Type Length ID of Structure N or 7 EDS No (Nonadb F B C M «05m >=5|j Ctirys Amphibole Nonasb Ambig/ND No Coord <5p Elements) ;

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Struct = > 0 5.1 >5:1 Aspect Ratio Grid acceptance: 7= Posit ve dittractlon 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 7= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Clay SO tile 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 = Matr X Non-Identified Actinolite NSD = No Structures Detectec

CONFIDENTIAL, CITY_21MC100_003470876 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176797