TEM asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume filters): 1928 Lab Group #: 7233 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 12 Grid Opening Size: 0.01124 Client Sample #: 12 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/27/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure NorN EDS No (Nonadb F B C M >=05 u >=5p Chrys Amphibole Nonasb Ambig/NO No Coord <5u Elements)

<• Pz If____ ■ 6/

Struct = > 0.5)1 >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 ate least 20 unfolded or overlapped grid squares <5% F B C M >5U t/= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile ! AMPHIBOLES Amphibole F = Single Fiber I Amosite I B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite I Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos T remolite i M = Matrix Non-Identified Actinolite i NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003467138 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180537