TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE yolmne_(liters_L 1920 Lab Group tf: 6986 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 12 Grid Opening Size: 0.01124 Client Sample #: 12 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID: Accelerating V'oltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/8/02

Analysis Performed By: MARK PEYSAKHOV

GO Structure Structure Type Length ID of Structure N or \ EDS i (Nonadb ' No F B C M Chrys Amphibole Nonasb Ambig/NO No Coord <5U Elements) ;

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

9= Positive diffraction pattern properties conforming to <50% jndissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed least 20 unfolded or overlapped grid squares <5% F B C V -/ EDS spectrum conforming to laboratory holes or opaque areas identification criteria otservec Chrvsotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite j Non-Asbestos Tremolite M = Matrix Actinolite I Non-Identified NSD : No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468390 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181367