TEM Asbestos air sample results, WC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: WC BOE Volume (liters): 1928 Lab Group #: 5960 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: Grid Opening Size: 0.01124

Client Sample #: 21 Area Examined: 0.04496 mm"

GRID BOX: Magnification: 20,000 GRID ID: Acceleratiiig Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/24/01

Analysis Performed By; MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or N EDS 1 No (Nonadb j F B C M >=05 J >=5|j chrys Amphibole Nonasb Ambig/ND No Coord <6m Elements) 1 ----------- —I ' z V i

. Struct = > 0.5(1 >5:1 Aspect Ratio Grid acceptaiicp;

N= Positive diffraction pattern properties conforming to <50% untjissoived lilter, overlapped cr folded Totals laboratory identification criteria observed <10% pariiculate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% f F B C M >5u BDS spectrum conforming to laboratory holes or opaque areas idertification criteria observed Chiysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersectionsi Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003458379 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179174