TEM asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet ClientNam^ NYC BOE Volume (liters): 1920 Lab Group#: 6940 Filter Type / Filter Area: MCE 385 mm" Lab'Sample #: 3 Grid Opening Size: 0.01124

Client Sample #: 03 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 EDS No F B C >=05 p Chrys Amphibole Nonasb ZVcLL’ (Nonadb I No Coord <5u j Elements) ;

4L

Struct = > 0.5,1 > 5:1 Aspect Ratio Grid acceptance:

v = Positive diffraction pattern properties conlorming Io <50% undissolved filter, overlapped or folded Totals laboratory identification criteria ooserved <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% C j M >5p 9= EDS spectrum conforming to laboratory F I B holes or opaque areas idenlificalion 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 i Tremolite M = Matrix Non-ldentified i Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468319 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181320