TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEMAsbestosIairl Count Sheet Client -Name: NYC BOE Volume (liters): 1920 Lab Group #: 7494 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 7 Grid Opening Size: 0.01124 Client Sample #: 07 Area Examined: 0.04496 mm- GRIP BOX: Magnification: 20.000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/21/02

Analysis Performed By MARK PEYSAKHOV

GO I Structure Structure Type Length ID of Structure N or v EDS I No (Nonadb F B C M >=05 M >=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5m Eiements)

-O-i

I 1—r ill

Struct = > l).5p > 5:1 Aspect Ratio Grid acceptance:

v = Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% partculate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% ; F B . C j M I >5u \= EDS spectrum conformirc to laboratory holes or opaque areas tdentificarion criteria ooserved Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite 9 = 9uncle i<3 libers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster ,>3 intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSC = No iotructures Detected

CONFIDENTIAL, CITY_21MC100_003471175 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177000