TEM asbestos air analysis log, Sample 4, Aug 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume filters): 1920 Lab Group #: 8760 Filter Type / Filter Area: MCE 385 mm" Lab Sample #: 4 Grid Opening Size: 0.01124 Client Sample #: 4 Area Examined: 0.04496 mm"

GRID BOX: /? Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: S/25/02

Analysis Performed By: ROMAN PEYSAKHOV

GO, Structure I Structure Type Length ID of Structure NorV EDS (Nonadb

s No F B C M >=05 u >=5)j Chrys Amphibole Nonasb Ambig/ND No Coord <5m Elemenls)

ZZZTZ -4— ■

Struct = > O.Sp >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 /= 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 apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSb = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003430555 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175192