TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1936 LabJ^Jrmin^ 5979 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 7 Grid Opening Size: 0.01124

Client Sample #: 7 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRIDED: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/28/01

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or N EDS No (Nonadb F B C M >=05 p >=5|J Chrys I 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 observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% G EDS spectrum conforming to laboratory holes or opaque areas I F I B C M >5|J

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

CITY_21MC100_003106785

NYC-WTC_000185527