TEM Asbestos air sample results, NYC BOE, Feb 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume /liters): 1832 Lab Group #: 6686 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 17 Grid Opening Size: 0.01124 Client Sample #: 20 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/15/02

Analysis Performed By: MARK PEYSAKHOV

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

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

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

N= EDS spectrum conforming to laboratory least 20 unfolded or overtapped grid squares <5% holes or opaque areas FTb c M >5p

identification criteria observed Chi'ysotile 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

CITY_21MC100_003103231

NYC-WTC_000183792