TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 7494 Filter Type / Filter Area: MCE 3S5 mm- Lab Sample #: 6 Grid Opening Size: 0.01124 Client Sample #: 06 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeY # Grid Openings: 4 Analysis Date: 4,21/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 7 EDS No (Nonadb ' F B C M >=05 p >=5|J Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements) ;

Struct = > O.ou > 5:1 Aspect Ratio Grid acceptance:

v= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboraton/ identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped gnd squares <5% j F I B j C ! M ■ >5u N = EDS spectrum conforming to laboratory^ holes or opaque areas loentification criteria observed Chrysotile ! i I AMPHIBOLES Amphibole , ' i F = Single Fiber Amosite 3 = Bundle ,<3 fibers <1 fiber diameter apart Crocidolite ■Ambiguous I I C = Cluster >3 Intersections! Anthophyllite Non-Asbestos ' ' Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detectec

CONFIDENTIAL, CITY_21MC100_003471174 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176999