TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

XbJVlAsbestos (ilir) Count Sheet Client Name: NYC BOE Yplumejlitersli 1928 Lab Group #: 5829 Filter Type / Filter Area: MCE 385 mnC Lab Sample #: 20 Grid Opening Size: 0.01124 Client Sample #: 20 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20 000 GRID ID : Accelerating Voltage: 100 KeV # Grid Openings: 4

Analysis Performed By MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or T EDS No (Nonadb F B C M >=05 y >=5tJ Chrys Amphibole Norssb Ambig/ND Elements) No Coord <5|J

3

Struct = > 0.5(.1 >5:i Aspect Ratio Grid acceptance:

9=: 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 overtapped grid squares <5% f F B C M >5p 9= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile [ AMPHIBOLES Amphibole F = Single Fiber i Amosite B = Bundle i<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 intersections) Anthophyllite Nou-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003459079 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179386