TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 7406 Filter Type / Filter Area: MCE 385 mm’ Lab Sample #: 9 Grid Opening Size: 0.01124 Client Sample #: 09 Area Examined: 0.04496 mm’ GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/15/02

Analysis Performed By: ROMAN PEYSAKHOV

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

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Struct = > 0.5)1 > 5:1 Aspect Ratio Grid acceptance;

v = 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 overlapped grid squares <5% B C M i >5p EDS spectrum conforminc to laboratory holes or opaque areas IF identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite 6 = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster |>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471068 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176927