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): 1936 Lab Group #: 7099 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 10 Grid Opening Size: 0.01124

Client Sample #: 13 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/16/02

Analysis Performed By: ROMAN PEYSAKHOV

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

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Struct = > 0.5)j .>5:1 Aspect Ratio Grid acceptance: 7= 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 grid squares <5% F B C M >5u V= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES i Amphibole F = Single Fiber Amosite [ B = Bundle (<3 fibers <1 fiber diameter apart j Crocidolite j Ambiguous C = Cluster (>3 Intersections) j Anthophyllite Non-Asbestos M = Matrix I Tremolite j Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468577 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181501