TEM asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NYC BOE Volume (liters): 1800 Lab Group #: 7354 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: x Magnification: 20 000 GRIDID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/8/02

Analysis Performed By: MARK PEYSAKHOV

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

Struct = > 0.5p. .> 5; I .\spect Ratio Grid acceptance; Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Tot^ 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 i C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos j Tremolite M = Matnx Non-Identified ' Actinolite ______ 1 NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_0 03470921 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176828