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): 1920 Lab Group #: 7494 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 1 Grid Opening Size: 0.01124 Client Sample #: 01 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRIDID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/21/02

Analysis Performed By: MARK PEYSAKHOV

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

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Struct = > 0.5p > 5:1 Aspect Ratio Grid acceptance: \ = Positive diffraction pattern croperties 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 I B I C ; M : >5p EDS spectrum conforming to laboratory holes or opaque areas I dentificaticn criteria obser/ec Chrysotile AMPHIBOLES Amphibole E = Single Fiber Amosite 3 = Bundle i<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster ;>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix N’on-Identified Actinolite NIC = No Structures Detectec

CONFIDENTIAL, CITY_21MC100_003471169 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176994