TEM Asbestos air sample results, NYC BOE, Dec 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: WC BOE Volume (liters): 1944 Lab Group #: 6010 Filter Type / Filter Area: MCE 385 mrn- Lab Sample #: Grid Opening Size: 0.01124 Client Sample #: 7 Area Examined: 0.04496 mm^

GRID BOX: Magnification: dq 000

GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 12/1/01

Analysis Performed By: MARK PEYSAKHOV

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

/

J

Struct = > 0.5u > 5:1 Aspect Ratto Grid acceptance: ^1= Positive diffraction pattern properties conforminc to <50% undissoived filter, overlapped or tolded Totals laboratory identification criteria ooserved <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 Uber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite j Non-Asbestos Tremolite M = Matrix Actinolite I Non-Identifisd NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003458562 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179272