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 niters): 1944 Lab Group #: 7185 Filter Type / Filter Area: MCE 385 mm’ Lab Sample #: 19 Grid Opening Size: 0.01124 Client Sample #: 19 Area Examined: 0.04496 mm* GRID BOX: We Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/23/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Norv EDS No >=05 M Amphibole Nonasb Ambig/ND (Nonadb F B C M >=5|J Chrys No Coord <5m 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 grid squares <5% F ; B c M >5iJ v'= EDS spectrum coniorming to laboratory holes or opaque areas ioentification criteria observed Chrysotile AMPHIBOLES i Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos T remolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO3467O29 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180463