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): 1840 Lab Group #: 7172 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: Magnification: 20 000 GRID ID: .O Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/23/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Stnjcture Nory EDS (Nonadb No F B C M >=05 M >=5|j Chrys Amphibole Nonasb Ambig/ND No ■ Coord <5p Elements)

a

' Struct = > 0.5)1 .>5:1 Aspect Ratio Grid acceptance: >/= Positive diffraction pattern properties conforming to ,<50% undissolved filter, overlapped or folded Totals , 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 I; ----------------------- Amphibole F = Single Fiber Amosite I B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections] Anthophyllite Non-Asbestos Tremolite M = Matrix Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003470496 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_OO0176540