TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume filters): 1920 Lab Group #: 7029 Filter Type / Filter Area: MCE 385 mm* Lab Sample #: 13 Grid Opening Size: 0.01124 Client Sample #: 13 Area Examined: 0.04496 mm’

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/11/02

.Analysis Performed By: ROMAN PEYSAKHOV

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

“7?

Struct = > 0.5g .> 5:1 Aspect Ratio Grid acceptance: ■'/= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed least 20 unfolded or overlapped grid squares <5% F B C M ^1= EDS spectrum conforming to laboratory holes or opaque areas identification critena observed Chrysotile "amphTbolesI Amphibole F = Single Fiber Amosite \ B = Bundle (<3 fibers <1 fiber diameter apart j Crocidolite Ambiguous C = Cluster (>3 Intersections) i Anthophyllite Non-Asbestos i Tremolite M = Matrix Actinolite Non-ldentified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO3468471 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181425