TEM asbestos air sample results, NYC BOE, Dec 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NA'C BOE Volume (liters): 1928 Lab Group #: 6073 Filter Tvpe / Filter Area: MCE 385 mm" Lab Sample 8 Grid Opening Size: 0.01124 Client Sample #: 8 Area Examined: 0.04496 mm*

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 12/10/01

Analysis Performed By: MARK PEYSAKHOV

GO Structure Structure Type Length ID of Structure N or N EDS No (Nonadb B C M >=05 0 :>=5|j Chrys Amphibole Nonasb Ambig/ND Elements) No Coord <5u

-3

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

N= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded T otals aboratory identification criteria obset\ed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B [ C EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLBS Amphibole r = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite I Ambiguous" C = Cluster (>3 Intersecaons) Anthophyllite ! Non-Asbestos T remolite M = Matnx Actinolite I Non-Identified NSC = No Structures Detected

CITY_21MC1OO_OO31O4583

NYC-WTC_000184063