TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 6928 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 8 Grid Opening Size: 0.01124

Client Sample #: 08 Area Examined: 0.04496 mm-

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

Analysis Performed By: ROMAN PEYSAKHOV

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

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Struct = > 0.5p >5:1 Aspect Ratio Grid acceptance: '/= 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 gnd squares <5% F ! B I C M i >5p 9= EDS spectrum conforming to laboratory holes or opaque areas ----- j-------------- identificalion 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-ldentified f Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468304 SUBJECT TO PROTECTIVE ORDER NO, 2, SEPT, 2008

NYC-WTC_000181309