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 (liters): 1840 Lab Group #: 7354 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #•. 10 Grid Opening Size: 0.01124 Client Sample #: 10 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 ibofStiucture Norv EDS No (Nonadb F B C M >=05 M ~ >=5iJ Chrys Amphibole Nonasb Ambig/ND No Coord <5|j Elements)

a

Struct = > 0.5n -> 5;l Aspect Ratio Grid aaeptance: 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 >5u y = EDS spectrum conforming to laboratory holes or opaque areas identification critena observed Chrysotile A.MPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos I remolite M = Matrix Non-Identified Actinolite NSO = Mo Structures Detected

CONFIDENTIAL, CITY_21MC100_003470916 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176823