TEM asbestos air sample data, NYC BOE, Aug 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume filters): 1936 Lab Groun #: 8760 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 17 Grid Opening Size: 0.01124

Client Sample #: 17 Area Examined: 0.04496 mm’ GRID BOX: /5*7Z Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 8/25/02

Analysis Performed By: .3 ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or V EDS (Nonadb No F B C M >To5p :>=5(J Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

Struct = > 0.5u > 5:1 Aspect Ratio Grid acceptance: ''I- 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 overiapped grid squares <5% F B C M >5|J EDS spectrum conforming to laboratory holes or opaque areas Identification criteria observed Chrysotile AMPHIBOLES Amphibole F - Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter aped Crocidolite Ambiguous C ^'Cluster (>3 Intersections) Anthopnyilite Non-Asbestos Tremolite M - Matrix ■ Actinolite Non-Identified NSD = Nc Structures Delected

CONFIDENTIAL, CITY_21MC100_003430461 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175175