TEM Asbestos air sample results, NYC BOE, Feb 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 6718 Filter Type / Filter Area: MCE 385 mm* Lab Sample #: 15 Grid Opening Size: 0.01124

Client Sample #: 15 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRIDID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/18/02

Analysis Performed By: MARK PEYSAKHOV

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

73“^ XT'

1

I Struct = >0.5p >5:1 Aspect Ratio Grid acceptance: ^/= Posidve 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 overiapped grid squares <5% F B C M >5|J ■/= 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) Anthophyllite Non-Asbestos Tremolite M = Matrix Actinolite Non-Identified NSD = No Structures Delected

CONFIDENTIAL, CITY_21MC100_003433790 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175951