Asbestos fiber analysis results, H.S. of Economics & Finance, Apr

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1928 Lab Group #: 7351 Filter Type / Filter Area: MCE 385 mm- Lab'Sample #: 16 Grid Opening Size: 0.01124 ClienCSatni^e #: 18 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRID ID: Accelerating A'oltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/7/02

Analysis Performed By: MICHAEL GORYCKI

GO. Structure Structure T/pe Length ID ol Structure N or 9 EDS (Nonadb Cp No Coord No F B C M >=05 (J Chrys Amphibole Nonasb Ambig/ND <5u Elements)

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Struct = > 0.5n >5:1 Aspect Ratio Grio acceptance.

\= Positive diftraction pattern properties coniorminc to <50% undissolved filter, overlapped or foidec Totals <10% particulate coverage >50% coverage ate laboratory identification criteria ooserved

9= EDS spectrum conforming to laboratory' least 20 ur^foiaed or ovg'lapped grid squares <5% / "T B C I M >5u holes or opaque areas identifioalion criteria obsenred Chrysotile AMPHIBOLES Amphibole F = Single i-iber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous \ C = Cluster (>3 Intersections) Anthophyllite Non-Asbesios ) Tremolite M = Matrix Non-Identified ] Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_0 03459965 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179560