TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1944 Lab Group #: 5979 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 15 Grid Opening Size: 0.01124

Client Sample #: 15 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/2S/01

Analysis Performed By: MARK PEYSAKHOV

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

Struct = > 0.5p _> 5:l Aspect Ratio Grid acceptance: 7= Positive diffraction pattern properties conforming to <50% undissolued filter, overlapped or folded Totals laboratory identification criteria observed <10% parScLilate coverage >50% coverage ate least 20 unfolded or overtapped grid squares <5% F B C M >5iJ 7= 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 = Matri); Non-Identified Actinolite NSC = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO3458483 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179220