TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 7021 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 13 Grid Opening Size: 0.01124 Client Sample #; 13 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/10/02

Analysis Performed By: MARKPEYSAKHOV

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

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Struct = > 0,5g > 5:1 Aspect Ratio Grid acceptance: 4= 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 overlapped grid squares <5% F B C M >5p EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES I Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = CMster (>3 Intersections) ; Anthophyllite i Non-Asbestos Tremolite । M = Matrix Actinolite Non-Identified NSD = No Structures Detected

CITY_21MC100_003108622

NYC-WTC_000185887