TEM Asbestos air sample results, NYC BOE, May 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume niters): 1928 Lab Group #: 7674 Eilter Type / Filter Area: MCE 385 mm^ Lab Sample #: 18 Grid Opening Size: 0,01124 Client Sample #: 18 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20 000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 5/8/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of structure N or V EOS (Nonadb No F B C M >-O5‘7 ■ >=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5m Elements)

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Struct “ > 0.5)1 >5:1 Aspect Ratio Grid acceptance: 'I- Positive diffraction pattern properties conforming to <50% undissolved filter, overiapped 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 'I- EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B - Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Antfiophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CITY_21MC100_003090222

NYC-WTC_000191075