TEM Asbestos air sample results, NYC BOE, Apr 29 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 7567 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 7 Grid Opening Size: 0.01124 Client Sample #: 07 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRIDID: Accelerating Voltage: too KeV # Grid Openings: 4 Analysis Date: 4/29/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Nor EDS (Nonadb No F B C M >=05 M >=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5m Elements)

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Struct = > 0.5p > 5:1 Aspect Ratio Grid acceptance:

\= 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 CM >5u 7= EDS spectrum conforming to laporatorv holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter aoart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471339 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177113