TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

a? . TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 7278 Filter Type / Filter Area: MCE 385 mm’ Lab Sample #: 9 Grid Opening Size: 0.01124 Client Sample #: Area Examined: 0.04496 mm’

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/31/02

Analysis Performed By: /\ /I ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Nor\ EDS No (Nonadb F B C M >=05 M :>=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5m Elements)

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i --------------- ------------------------------ I I Struct = > 0.5p > 5:1 Aspect Ratio Grid acceptance: Positive diffraction pattern properties confoiming 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 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 T C = Cluster (>3 Intersections) Anthophyllite Tremolite Non-Asbestos T M = Matrix NSD = No Structures Detected Actinolite Non-Identified T CONFIDENTIAL, CITY_21MC100_003470741 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176706