TEM asbestos air sample data sheet, Sample 8, March 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1952 Lab Group #: 7161 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: 3/21/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Nor 7 EDS No (Nonadb F B C M >=05 p :>=5|J Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

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Struct = > 0.5u > 5:l Aspect Ratio Grid acceptance: ■ V = Positive diffraction pattern properties conforming to <50% undissolved filter, ovedapped 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 >5'j EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile i AMPHIBOLES ! Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart i Crocidolite Ambiguous C = Cluster (>3 Intersections) j Anthophyllite j Non-Asbestos j Tremolite j M = Matrix Actinolite I Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468670 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181582