TEM Asbestos air sample results, NYC BOE, June 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1800 Lab Group #: 8278 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 8 Grid Opening Size: 0.01124

Client Sample #: 10 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRIDER Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 6/25/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Stnjcture N or EDS (Nonadb No F B C M >=05 M >=5iJ Chrys Amphibole Norasb Ambig/ND No Coord <5p Elements)

Struct = > 0.5n >5:1 Aspect Ratio Grid acceptance: >/= Positive diffraction pattern properties conforming to <50% undissolved filter, overtapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overtapped 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 apart Crocidolite Ambiguous C = Cluster (>3 intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003461815 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179926