TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NTC BOE Volume (liters): 1936 Lab Group #: 5974 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 10 Grid Opening Size: 0.01124

Client Sample #: 10 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRIDED: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/26/01

Analysis Performed By: CZlIc: MARK PEYSAKHOV

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

Struct = > 0.5p 5:1 Aspect Ratio Grid acceptance: >/= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification critena observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped gnd squares <5% F B C M I >5u 4 = EDS spectrum conforming to laboratory holes or opaque areas identification cnteria 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 T remolite M = Matrix Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003458426 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179192