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): 1920 Lab Group #: 7112 Filter Type / Filter Area: MCE 385 mm* Lab Sample #: 2 Grid Opening Size: 0.01124

Client Sample #: 02 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID ED: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/17/02

Analysis Performed By: MARK. PEYSAKHOV

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

J

Struct = > 0.5p .> 5:1 Aspect Ratio Grid acceptance: y = 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 ^/= EDS spectrum conforming to laboratory holes or opaque areas identification 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 i T remolite M = Matrix Actinolite Non-ldentified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003470381 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176470