TEM Asbestos air sample results, NYC BOE, June 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name; NYC BOE Volume (liters): 1800 Lab Group #: 8194 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 9 Grid Opening Size: 0.01124 Client Sample #; 11 Area Examined: 0.04496 mm^ GRID BOX: Ma&nification: 20,000 GRID ID: cg~~ Accelerating Voltage; 100 KeV # Grid Openings: 4 Analysis Date; 6/20/02

Analysis Performed By: MARK PEYSAKHOV

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

Struct = > 0.5p >5:1 Aspect Ratio Grid acceptarice: a1= Positive diffraction pattern properties conforming to <50% undissolved fitter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overtapped grid squares <5% F B C M >5p ■7= EDS spectrum conforming to laboratory holes or opaque areas identification criteria obsenred Chrysotile Famphiboles i Amphibole F = Single Fiber Amosite 8 = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Acbnolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO3461696 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179844