TEM Asbestos air sample results, NYC BOE, Dec 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1890 Lab Group #: 6021 Filter Type / Filter .Area: MCE 385 mm^ Lab Sample #: 8 Grid Opening Size: 0.01124 Client Sample #: 08 Area Examined: 0.04496 mm-

GRID BOX: izY) Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 12/3/01

Analysis Performed By: ROMAN PEYSAKHOV

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

____ fl

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

CONFIDENTIAL, CITY_21MC100_003467358 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180677