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): 1928 Lab Group #: 7110 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 3 Grid Opening Size: 0.01124 Client Sample #: 05 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/17/02

Analysis Performed By: MARK PEYSAKJHOV

GO. Structure Structure Type Length ID of Structure N or V | EDS —rr-TTz—' (Nonadb No F B C I M >=05 M :>=5p Chrys Amphibole Nonasb Ambig/ND i ' 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 <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B >5u ’/= EDS spectrum conforming to laboratory C M holes or opaque areas identification criteria observed Cluysotile AMPHIBOLES । Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous : C = Cluster (>3 Inte'sections) j Anthophyllite Non-Asbestos I Tremolite M - Matrix Non-Identified ' I Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO3468594 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181511