TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 7278 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 14 Grid Opening Size: 0.01124 Client Sample #: 14 Area Examined: 0.04496 GRID BOX: '2- Magnification: 20,000 GRID ID: J Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/31 /02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length IO of Structure N or EOS No (Nonadb No Coord F B C M >=05 (J >=5p Chrys Amphibole Nonasb Ambig/ND Elements) <5m

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I Struct = >0.5p >5:1 Aspect Ratio Grid acceptance: Positive diffraction pattern properties conforming to <50% undissolved filter, overtapped or folded Totals laboratory identificaSon criteria observed <10% particuiate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5u V= 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-Asbestos Tremolite M = Matrix Actinolite Non-Identificd NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100^003470724 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176695