TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos(airlCountSh^ Client Name: NYC BOE Volume (liters): 1944 Lab Group #: 5986 Filter Tvpe / Filter Area: MCE 385 mm- Lab Sample #: 20 Grid Opening Size: 0.01124 Client Sample #: 20 Area Examined: 0.04496 mm" GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: too KeV # Grid Openings: 4 Analysis Date: 11/29/01

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or V EDS No (Nanadb F B C M >=05 p Chrys Amphibole Nonasb Ambig/NC No Coord <5(J Elements)

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Struct = > 0.5p _> 5:1 Aspect Ratio Grid acceptance: 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 >5p 9= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile i AMPHIBOLY Amphibole F = Single Fiber Amosite B = Bundle {<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) I Anthophyllite Non-Asbestos Tremolite M = Matnx Non-Identified Actinolite ,MSD = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO3458513 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179243