TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Clieni Name: NYC BOE Volume (litersi: 1920 Lab Group #: 5975 Filter Tvpe / Filter Area: MCE 385 mm- Lab Sample #: 20 Grid Opening Size: 0.01124

Client Sample #: 20 Area Examined: 0.04496 mm*

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/27/01

Analysis Performed By: Kyt ROMAN PEYSAKHOV

GO. Structure Structure iype Length ID of Structure N or 7 EDS (Nonadb No B c M >=05 u >=5(j Chrys Amphibole Nonasb AmbigyND Elements) Nc Coord <5u f

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Struct = >0.5p >5:; Aspect Ratio Grid acceptance: 7= 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 overlapped grid squares <5% F B C M >5p 7= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber i Amosite B = Bundle (<3 fibers <1 fiber diameter apart ! Crocidolite Ambiguous C = Cluster (>3 Intersections) : Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified , Actinolite MSB = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003458455 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179206