TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos fairV Count Sheet Client Name: NYC BOE Volume Biters'): 1920 Lab Group #: 7285 Filter Type / Filter Area: MCE 385 mm’ Lab Sample #: 15 Grid Opening Size: 0.01124 Client Sample #: 15 Area Examined: 0.04496 GRID BOX: Magnification: 20 000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/31/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 7 EDS No (Nonadb F B 0 M ■ >=05 p Chrys Amphibole Nonasb Ambig/NO No Coord <5p Elements)

Struct = > 0.5)1 > 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 C M >5u V= 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 C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos i Tremolite 1 M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003470703 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176678