TEM asbestos air sample data sheet, Sample 11, March 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1928 Lab Group #: 7161 Filter Type / Filter Area: MCE 385 mm= Lab Sample #: 11 Grid Opening Size: 0.01124 Client Sample #: 11 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID : Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/21/02

Analysis Performed By; MARK PEYSAKHOV

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

Struct = > 0.5p >5:1 Aspect Ratio Grid acceptance: 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 >5p V= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile : AMPHIBOLES 1 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 ! Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO3468673 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181585