TEM Asbestos air sample data, Sample 10, March 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 7247 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 Pate: 3/28/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure NorN EDS (Nonadb No F B C >=06 p >=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

c- '

n

1 Struct = > 0.5p _> 5:1 Aspect Ratio Grid acceptance:

v= Positive diffraction pattern properties conforming to <50% undissoived 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 >5p v’= 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 Non-Identified i Actinolite NSD = No Structures Delected

CONFIDENTIAL, CITY_21MC100_003468796 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181687