TEM asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 6986 Filter Type / Filter .Aiea: MCE 385 mm- Lab Sample #: 5 Grid Opening Size: 0.01124

Client Sample #: 05 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRfD ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/8/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Nor\ EDS (Nonadb No F B C M >=05 iJ >=51J Chrys Amphibole Nonasb Ambig/ND No Coord <6u Elements)

Struct = >0.bp >5:1 Aspect Ratio Grid acceptance:

9= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed least 20 unfolded or overtapped grid squares <5% F B C M >5u 2= 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-Asbcstos Tremolite M = Matrix Non-ldentified Actinolite NSD = No Structures Delected

CONFIDENTIAL, CITY_21MC100_003468403 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181374