TEM Asbestos air sample results, NYC BOE, Jan 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1960 Lab Group #: 6408 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 10 Grid Opening Size: 0.01124 Client Sample #: 10 Area Examined: 0.04496 mm*

GRID BOX: Magnification: 20,000 GRIDED: Accelerating Voltage: 100 KeV ff Grid Openings: 4 Analysis Date: 1/23/02

Analysis Performed By: MARK PEYSAKHOV

-GO. Structure Structure Type Length ID of Structure N or y EDS No (Nonadb F B C >=05 u >=5|J Chrys Amphibole Nonasb Ambig/ND No , Coord <6p Elements)

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Struct = > 0.5p _> 5:1 Aspect Ratio Grid acceptance: A- 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 overiapped grid squares <5% F B C M >5u >/= 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 Crocidolite Ajnbiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Iden tified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003467470 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180748