TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume filters): 1840 Lab Group #: 7248 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: 3/28/02

Analysis Performed By: MARK PEYSAKHOV

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

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Struct = > 0.5p > 5:1 Aspect Ratio Grid acceptance; Positive diffraction 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 overiapped grid squares <5% F B C "M >5u EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile ; AMPHIBOLES i Amphibole F = Single Fiber i Amosite j B = Bundle (<3 fibers <1 fiber diameter apart ■ Crocidolite : Ambiguous C = Cluster (>3 Intersections) ; Anthophyllite j Non-Asbestos Tremolite | M = Matrix i Actinolite I Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_0 03470626 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176628