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 (liters): 1920 Lab Group 6940 Filter Type / Filter Area: MCE 3S5 mm- Lab'Sample #: 4 Grid Opening Size: 0,01124

Client Sample #: 04 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/5/02

Analysis Performed By: MARK PEYSAKHOV

GO Structure Structure Type Length D of Structure N or X EDS ; No (Nonadb F B C >=05 p Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements) ------------ i

3 3^

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Struct = > O 5l! >5:1 Aspect Ratio Grid acceptance: v'A Positive diffraction pattern properties conforming Io <50% undissolued 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 >5u EDS spectrum conforming to laboratory holes or opaque areas identification criteria obsetved Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite S = Bundle |<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster i>3 Intersections) Anthophyllite Non-Asbestos M = Matrix Tremolite Actinolite Non-Identified | NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468320 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181321