TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume /liters): 1936 Lab Group #: 5940 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 15 Grid Opening Size: 0.01124

Client Sample #: 15 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/21/01

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Nor '/ EDS No (Nonadb F B C M >=05 p Chrys Amphibole Nonasb AmbigzND No 23oord <5p Elements)

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1 1

Ej I i Struct > 0.5p -> 5; 1 Aspect Ratio Grid acceptance: y = Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5u 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 NSD = No Structures Detected

CITY_21MC100_0 03106626

NYC-WTC_000185482