TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: N^’C BOE yolum£jliters)2 1944 Lab Group #: 5979 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 9 Grid Opening Size: 0.01124

Client Sample #: 9 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRIDED: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/28/01

Analysis Performed By: MARK PEYSAKHOV

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

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Struct = > 0,5u ,> 5:1 Aspect Ratio Grid acceptance: 7= Positive diffraction pattern properties conforming to <50% undissplved filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or ovedapped grid squares <5% 7*= EDS spectrum conforming to laboratory identification criteria observed holes or opaque areas Chrysotile | L B C M >5p

AMPHIBOLES Amphibole j F = Single Fiber Amosite B = Bundle {<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) i Anthophyllite Nan-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CITY_21MC100_003106787

NYC-WTC_000185529