TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TIEM Asbestos (aid Count Sheet Client Name: NYC BOE Volume /liters): 1920 Lab Group #: 7392 Filter Type / Filter Area: MCE 385 mm= Lab Sample #: 3 Grid Opening Size: 0.01124 Client Sample #: 05 Area Examined: 0.04496 mm’ GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/13/02

Analysis Performed By: MARK PEYSAKHOV

GO, Structure Structure Type Length iO of Structure N or v EOS No (Nonadb F B C M >=05 p >=5|J Ch^s Amphibole Nonasb Ambig/ND No Coord <5p Elements)

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Struct = >0.5n >5:1 Aspect Ratio Grid acceptance: 7= Positive diffraction pattern properties conforming Io <50% undissolved filter, overiapped or folded Totals ‘ laboratory identification critena observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5|j 7= EDS spectrum conforming Io laboratory holes or opaque areas identification criteria observed Chrysotile . AMPHIBOLES i Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster {>3 Intersections) i Anthophyllite Non-Asbestos Tremolite M = Matrix Acb’nolite Non-Identified NSC = No Structures Detected

CONFIDENTIAL, CITY_21MC100_009505410 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000178895