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): 1936 Lab Group #: 5979 Filter Tvpe / Filter Area: MCE 385 mm- Lab Sample #: 2 Grid Opening Size: 0.01124

Client Sample #: Area Examined: 0.04496 min=

GRID BOX: >,^3 aS Magnification: 20,000 GRIDED: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/28/01

Analysis Performed By: MARK PEYSAKHOV

GO^ Structure Structure Type Length ID of Structure N or y EDS No (Nonadb = - M >=05 |J >=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5u Elements)

Struct = > 0.5u >5:1 Aspect Ratio Grid acceptance: 7 = Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped orfoldea Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5u 7= EDS spectrum conforming to laboratory holes or opaque areas idenffcation 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 M = Matrix Tremolite Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003458470 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179208