TEM Asbestos air sample results, NYC BOE, June 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1944 Lab Group #: 8229 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 15 Grid Opening Size: 0.01124

Client Sample #: 15 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20 000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date; 6/23/02 '--------------------------------------------- Analysis Performed By: fw ROMAN PEYSAKHOV

GO. Structure Structure Type .Length ID of Structure N or n EDS (Nonadb No F B C M >^5u- , Chrys Amphibole Nonasb Ambig/ND Elements) <5p

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Struct = > 0.5(1 >5:1 Aspect Ratio Grid acceptance: ' <50% undissolved filler, overlapped or folded Totals •/= Positive diffraction pattern properties conforming to <10% parfculate ooverage >50% coverage ate laboratory identification criteria observed least 20 unfolded or overlapped grid squares <5% F B C M ’5m li-EDS spectrum conforming to 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) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003461750 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179882