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 (liters): 1928 Lab Group #: 8760 Filter Type / Filter Area: MCE 385 mm2 Lab Sample #: 5 Grid Opening Size: 0.01124

Client Sample #: 5 Area Examined: 0.04496 mrr- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 8/25/02

Analysis Performed By: ROMAN PEYSAKHOV

GO Structure Structure Type Length ID of Structure N or V EDS f-—' No (Nonadb F B C M >=05 p Chrys Amphibole Nonasb AmbigyiMD No Coord <5p Elements) 1

73 ..MO

Struct = > 0,5p > 5:1 Aspect Ratio Gnd acceptance:

'A Positive diffraction pattern properties conforming to <50% undissolued filter, c7erlaBped 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 >5p EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile 'AMPHiBOLES~i Amphibole ■F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous G = Cluster (>3 intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite I NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003430449 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175167