Asbestos air sample TEM analysis report for 99 Church Street,

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: ATC Volume (liters): 1300 Lab Group #: 6804 Filter Type / Filter Area: MCE 385 mm= Lab Sample #: 10 Grid Opening Size: 0.01124 Client Sample #: 10 Area Examined: 0.06744 mm= s_ GRID BOX: 7 Magnification: 20,000 _ GRID ID: t Accelerating Voltage: 100 KeV # Grid Openings: 6 Analysis Date: 2/24/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 4 EDS (Nonadb No F B C M >05p >=5p ChryS Amphibole Nonasb Ambig/ND No Coord <5p Elements)

2 2 Z //

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Struct = > 0.5µ > 5:1 Aspect Ratio Grid acceptance: I: 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 >Sia .l= 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 I i Actinolite NSD = No Structures Detected

NYC-WTC 000124337