TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters'): 1936 Lab Group #: 5979 Filter Type / Filter Area: MCE 385 mm" Lab Sample #: 3 Grid Opening Size: 0.01124

Client Sample #: 3 Area Examined: 0.04496 mm"

GRID BOX: Ma2nification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/28/01

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 7 EDS (Nonadb No F B C M >=05 u >=5(j Chrys Amphibole Nonasb Ambig/ND No Coord <5|J Elements)

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-3 cr ^43^ A

Struct = > 0.5m. > 5:1 Aspect Ratio Grid acceptance: 9= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ale least 20 unfolded or overlapped grid squares <5% F B C M >5|j 9= EDS spectrum conforming to laboratory holes or opaque areas identi'ication criteria observed Chrysotile i AMPHIBOLES I Amphibole F = Single Fiber j Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos T remolite M = Matrix Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003458471 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179209