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 niters): 1936 Lab Group #: 7356 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 8 Grid Opening Size: 0.01124 Client Sample #: 8 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/8/02

Analysis Performed By: MARK PEYSAKHOV

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

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Struct = > 0.5(1 .> 5:1 Aspect Ratio Grid acceptance: V= Positive diffraction pattern properties conforming to "50% undissolved filter, overlapped or folded Totals laboratory. u —___ identification ..J a--- observed criteria <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5m t/= EDS spectrum conforming to laboratory holes or opaque areas dentification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber I Amosite B = Bundle (<3 fibers <1 fiber diameter apart I Crocidolite Ambiguous C = Cluster (>3 Intersections) ' Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CITY_21MC100_003095259

NYC-WTC_000193667