TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume niters): 1928 Lab Group #: 5868 Filter Type / Filter Area: MCE 385 mm" Lab Sample #: 6 Grid Opening Size: 0.01124

Client Sample #: 6 Area Examined: 0.04496 mm"

GRID BOX: Magnification: 20 000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/10/01

Analysis Performed By: MAEKPEYSAKHOV

GO. Structure Structure Type Length ID of Stnjcture N or EDS (Nonadb No F B C M >=05 |j :>=5|J Chrys Amphibole Nonasb Ambig/ND No j Coord Elements)

a

Struct = > 0 5n 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 ?5p EDS spectrum conforming to laboratory holes or opaque areas identification criteria obsenred 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_003459094 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179392