TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: \Yi BOE Volume (liters): 1920 Lab Group #: 6910 Filter Type / Filter Area: MCE 385 mni- Lab Sample #: 8 Grid Opening Size: 0.01124 Client Sample #: 08 Area Examined: 0,04496 mm-

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

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 4 EDS (Nonadb ’ No F B C M >=05 p >=5u Chrys Amphibole Nonasb Ambig/ND No Cooi-d <5u Elements) ;

e’ I .------

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Struct = > 0.5(j > 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 overlapped grid squares <5% F B C M >5u a/= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile 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 = Matrix ■Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468284 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181296