TEM Asbestos air sample results, NYC BOE, Feb 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 6629 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 14 Grid Opening Size: 0.01124 Client Sample #: 14 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/11/02

Analysis Performed By: MARK PEYSAKHOV

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

3 3—7^

Struct = > 0.5|i >5:1 Aspect Ratio Grid acceptance: '/= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% parfculate 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 critena observed Chrysotile : AMPHIBOLES I Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart ) Crocidolite j Ambiguous C = Cluster (>3 Intersections) I Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified NSD = No Structures Delected Actinolite 1

CONFIDENTIAL, CITY_21MC1OO_OO3467867 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181020