TEM Asbestos air sample results, NYC BOE, July 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1800 Lah Group #: 6856 Filter Type / Filter Area: MCE 385 mm Lab Sample #: Grid Opening Size: 0,01124

Client Sample #: 25 Area Examined: 0,04496 mm-

GRID BOX: Magnification: 20,000 GlUD ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 7/02

.Analysis Performed By: .MARK PEYSAKHOV

GO, Structure Structure Type Length ID of Structure N or N EDS ('v'onadb No F B C M >=05 u >=5p Chrys AmphiDole Nonasb Ambig/ND No Coord Eie,ments) <5p

c 4’ Z?

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

2= Positive diffraction pattern properties conforming to <50% undissotved filter, overlapped or ‘olded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed least 20 unfolded or overlapped grid squares <5% f F B C ! M >btJ EDS spectrum conforming to laboratory holes or opaque areas L 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 - ____________ L M = Matrix : Non-ldentified Actinolite NSD = No Structures Detected

CITY_21MC100_003103608

NYC-WTC_000183967