TEM Asbestos air sample results, NYC BOE, Aug 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 8760 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 7 Grid Opening Size: 0.01124 Client Sample #: 7 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 8/25/02 Analysis Performed By: ^•'7

ROMAN PEYSAKHOV

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

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5 2 1

■ Struct = > 0.5p > 5:1 Aspect Ratio Grid acceptance: 7= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped Or folded TZotaJs laboratory identification critena observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >6p 'J- 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 j T remolite M = Matrix Non-Identified 1 Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003430360 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175142