TEM Asbestos air sample results, NYC BOE, Feb 2002

NYC 9/11 Public Portal Document

TEM x4sbestos fair) Count Sheet Client Name: NYC BOE Volume /liters): 1S24 Lab Group #: 6720 Filter Tvpe / Filter Area: MCE 3S5mm- Lab Sample #: 9 Grid Opening Size: 0.01124 Client Sample 12 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV m Grid Openings: 4 Analysis Date: 2/18/02

Analysis Performed By: MARK PEYSAKHOV

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

- -3 yy

I i 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% partculata coverage >50% coverage ate least 20 unfolded oroveriapped grid squares <5% F I B I C i M >5p N= EDS spectrum conforming to laboratory holes or opaque areas identification critena observed AMPHIBOLES I Chry'sorile Amphibole ) ZIZZlZL r = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite I Ambiguous ' C = Cluster f>3 Intersections) • Anthophyllite I Non-Asbestos j Tremolite M = Matrix ! Non-Identified j Actinolite NSD = No Structures Detected . 1

CITY_21MC100_003103294

NYC-WTC_000183818