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 (liters): 1920 Lab Group #: 7020 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 5 Grid Opening Size: 0.01124

Client Sample #: 05 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRIDID: Accelerating Voltage: too KeV # Grid Openings: 4 Analysis Date: 3/10/02

Analysis Performed By; MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or A EDS (Nonadb No F B C M >=05 |J '=5p Chrys Amphibole Nonasb Ambig/ND <5|J Elements)

Struct = > 0.5)1 >5:1 Aspect Ratio Grid acceptance:

'J= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboraton/ identification criteria observed

'/= EDS spectrum conforming to laboratory least 20 unfolded or overlapped gnd squares <5% holes or opaque areas r F B c M >5|j

identification criteria observed Chrysotile ■AMPHIBOLES Amphibole r = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous i C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CITY_21MC100_003102428

NYC-WTC_000183295