TEM Asbestos air sample results, NYC BOE, Dec 2001

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NYC BOE Volume (liters): 1952 Lab Group #: 6142 Filter Tvpe / Filter Area: MCE 385 mm- Lab Sample #: 8 Grid Opening Size: 0.01124 Client Sample #: 8 Area Examined: 0.04496

GRID BOX: 677 Magnification: 20,000 GRIDED: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 12/19/01

Analysis Performed By; ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or EDS Nc >=05 p : (Wonadb F B C M •=5iJ Chrys Amphibole Nonasb Ambig/NC No Coord <5u Elements)

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Struct = > 0.5u >5:1 Aspect Ratio Grid acceptance: 9= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals ianoratory identificatioh criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% B C I M 9= EDS spectrum conforming to laboratory holes or opaque areas identification criteria obseived Chrysotile | AMPHIBOLES Amphibole F = Single Fiber Amosite i B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos M = Matrix Tremolite Actinolite Non-Identified NSD = No Structures Detected

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NYC-WTC_000184287