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 filters): 1816 Lab Group #: 8119 Filter Type / Filter Area: MCE 385 mm" Lab Sample #: 9 Grid Opening Size: 0.01124 Client Sample #: 11 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20 000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 6/15/02

Analysis Performed By: f\// ROMAN PEYSAKHOV T

GO. Structure Structure Type Length ID of Structure Norv EDS No (Nonadb F B C M >=05 (J >=5|J Chrys Amphibole Nonasb Ambig/ND No Coord , — <5p Elements)

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Struct = > 0.5p >5:1 Aspect Ratio Grid acceptance: 'J= Positive diffraction pattern properties conforming to <50% undissolved filter, overiapped or folded Totals laboratory identification criteria obsenred <10% particulate coverage >50% coverage ate

’/= EDS spectrum conforming to laboratory least 20 unfolded or overlapped grid squares <5% holes or opaque areas F B c M >5p identification criteria obsenred 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-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003461579 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179760