TEM asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1816 Lab Group #: 7249 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 8 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: 3/28/02

Analysis Performed By: MARK PEYSAKHOV

GO, Structure Structure Type Length r ID of Structure N or EDS (Nonadb No F B C M >=05 M ~ >=5h Chrys Amphibole Nonasb Ambig/ND No Coord <5u Elements)

S..-

Struct = >0.5p >5:1 Aspect Ratio Grid acceptance: v= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals _______ ____________ .____u____ J <10% particulafe coverage >50% coverage ate iacoratory tdentification criteria observed least 20 unfolded or overlapped gnd squares <5% F B C I M >5u \'= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile ---- ---- AMPHIBOLES _L_ Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite i Non-Asbestos Tremolite M = Matrix I Non-Identified i Actinolite NSD = No Structures Detected

CITY_21MC100_003102884

NYC-WTC_000183624