TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEMAsbestosfairlCountSh^ Client Name: NYC BOE Volume (liters): 1928 Lab Group #: 7110 Filter Type / Filter Area: MCE 385 mm" Lab Sample #: 12 Grid Opening Size: 0.01124

Client Sample #: 14 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/17/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or v EDS (Nonadb No F B G M >=05 p >=5pi Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

g,

<2

Sti'uct = > 0.5p > 5:1 Aspect Ratio Grid acceptance: A = 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 >5u A- EDS.spectrum conforming to laboratory holes or opaque areas identification criteria observed Clirysotile , AMPHIBOLES Amphibole F = Single Fiber Amosite E = Bundle (<3 fibers <1 fiber diameter apart ‘ Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos ’ Tremolite M = Matrix ■ C Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO34686O3 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181520