NYC-WTC_000215553

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: WC BOE Volume (liters): 1800. Lab Group #: 6843 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 21 Grid Opening Size: 0.01124

Client Sample #: 24 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/27/02

Analysis Performed By: MARK PEYSAKHOV

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

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

CITY_21MC100_002872569

NYC-WTC_000215553