TEM Asbestos air sample results, OTC BOE, Dec 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: OTC BOE Volume (liters): I960 Lab Group #: 6052 Filter Type / Filter Area: MCE 385 mm* Lab Sample #: 5 Grid Opening Size: 0.01124 Client Sample #: 07 Area Examined: 0.04496 mm* GRID BOX: Magnification: 20.000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 12/6/01

Analysis Performed By; MARK PEYSAKHOV

GO. Structure Structure T ype Length ID of structure N or N EDS No (Nonadb F B C M >=05 p >=5p Chrys Amphibole Nonasb Ambig/ND No , Coord <5p Elements)

1 Struct = > 0.5p >5:1 Aspect Ratio Grid acceptance: ^i= Positive diffraction pattern properties conforming to <50% undissDived filter, overlapped or folded Totals Iaborato7 identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B j C i M >5u EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile 1 AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-ldsntified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003467379 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180690