TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume /liters): 1920 Lab Group #: 7043 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 5 Grid Opening Size: 0.01124 Client Sample #: 05 Area Examined: 0.04496 mm^ GRID BOX: g? Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid O penin gs: 4 Analysis Date: 3/12/02

Analysis Performed By: MARK PEYSAKHOV

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

I I

Struct = > O.Sp _> 5:1 Aspect Ratio Grid acceptance: Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded LotaLs laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5p ■/= EDS spectrum conforming to laboratory holes or opaque areas identification criteria 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 Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468483 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181433