TEM asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NYC BOE Volume (liters'): 1936 Lab Group #: 7216 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 15 Grid Opening Size: 0.01124

Client Sample #: 15 Area Examined: 0.04496 mm^

GRID BOX: Ma2nification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openinas: 4 Analysis Date: 3/26/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type \ Length ID of Structure N or v EDS (Nonadb No F B C M I >=05 p >=5p j Chrys Amphibole Nonasb Ambig/ND No Coord 1 <5m Elements) I

, -3

Struct = > 0.5p .>5:1 Aspect Ratio Grid acceptance: yj- Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overtapped grid squares <5% F B C M >5u 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 - Matnx Actinolite Non-Identified NSC = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003467112 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180520