TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

i TEM Asbestos (air) Count Sheet Client Name: NYC BOE VolumeJIitersi: 1840 Lab Group #: 7540 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 7 Grid Opening Size: 0.01124 Client Sample #: 02 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRID ID: erg Accelerating V^oltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/27/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length D of Structure N or v EDS No (Nonadb F B C M >=05 pi :>=5iJ Chrys Amphibole Nonasb Ambig/ND No Coord <5m Elements) i

Struct = > 0.5n > 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 I >5u \= EDS spectrum conforming to laboraton/ holes or opaque areas identification criteria observed Chrysotile ■AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apan Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix [ Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_0 03471296 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177081