TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1800 Lab Group #: 7291 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 11 Grid Opening Size: 0.01124 Client Sample #: 11 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20.000 GRIDID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4.Y/02 Analysis Performed By: A

ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 7 EDS 1 No (Nonadb ; F B C M >^05 u ; '=5|J Chrys Amphibole Nonasb Ambig/ND No Coord <5u 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 <l0°'o particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% [ ! F I B i C : M I >5p v = EDS spectrum conforming to laboratory holes or opaque areas I Identification criteria observed Chrysotile i 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 = Nc Structures Detected

CONFIDENTIAL, CITY_21MC100_003470763 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176722