TEM asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEMAsbestoslairlCountShe^ Client Name: NYC BOE Volume (liters): 1848 Lab Group #: 7267 Filter Type / Filter Area: MCE 385 Lab Sample #: 7 Grid Opening Size: 0.01124

Client Sample #: 10 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/30/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure T/pe Length ID of Structure N or v EDS (Nonadb No F B C M >=05 p >=5p Chrys Amphibole Nonasb Ambig/ND No Coord <Sp Elements)

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! I — Struct = > 0.5p > 5; 1 Aspect Ratio Grid acceptance: Positive diffraction pattern properties conforming to <50% undissolved filler, 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 'i= 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 T remolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

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NYC-WTC_000183639