TEM Asbestos air sample results, NYC BOE, May 2002

NYC 9/11 Public^Portamocument

TEM Asbestos (air) Count Sheet Client Name; NYC BOE Volume (litersV. 1928 Lab Group 7621 Filter Type / Filter Area; MCE 385 Lab Sample #: 7 Grid Opening Size: 0.01124 Client Sample #: 7 Area Examined: 0.04496 GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV , # Grid Openings: 4 Analysis Date: 5/4/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or v EDS No F B ■C M >=05 g :>=5p Amphibole Nonasb Amb^ND (Nonadb No Coord Chrys Elements) <Sg

J*

■

Struct = > 0.5g > 5:1 Aspect Ratio Grid acceptance: Positive diffraction pattern properties conforming to undissolved filter, overlapped 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 >5g ’/= 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 I M = Matrix Non-Identified Actinolite I NSD = No Structures Detected

CITY_21MC1OO_OO3O93O82

NYC-WTC_000192706