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 #: 6940 Filter Type / Filter Area: MCE 385 mm- Lab'Sample #: Grid Opening Size: 0.01124

Client Sample #: 13 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/5/02

Analysis Performed By: MARK PEYSAKHOV

GO Structure Structure Type Length ID of Structure N or 9 I EDS No F B C M >=06 M >=5)j Chrys Amphibole Nonasb Ambig/ND S No Coord <5|J I Elements)

Struct = > O.bp >5:1 Aspect Ratio Grid acceptance: 9= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ale

V= EDS spectrum conforming to laboratory least 20 unfolded or overlapped grid squares <5% f F B I C M ’5p holes or opaque areas identificaiion 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 I 1 M = Matrix I Non-ldentified J Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468329 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181328