TEM Asbestos air sample results, NYC BOE, Feb 2002

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client xName: NYC BOE Volume (liters): 1800 Lab Group #: 6843 Filter Type / Filter Area: VICE 385 mm- Lab Sample #: 21 Grid Opening Size: 0.01124

Client Sample #: 24 Area Examined: 0.04496 mm^

GRID BOX: -- Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 AnalysisDate: 2/27/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Nor v EDS 1 (Nonadb 1 No F B C M >=05 pi >=5U Chrys Amphibole Nonasb Ambig/ND Elements) j No Coord <5U ~ I

Struct = > 0.5(1 > 5; 1 Aspect Ratio Grid acceptance;

4= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed least 20 unfolded or overlapped grid squares <5% F M >5u 7= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Clirysotile ! AMPHIBOLES Amphibole F = Single Fiber Amosite 3 = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster !>3 Intersections) Anthophyllite i . Non-Asbestos Tremolite M = Matrix Actinolite I Non-Identified MSD = No Structures Delected

CITY_21MC100_0 03103541

NYC-WTC_000183929