TEM Asbestos air sample results, NYC BOE, Feb 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NTC BOE X'olume (liters): 1824 Lab Group #: 6749 Filter Tvpe .' Filter Area: -MCE 3S5 mm- Lab Sample 10 Grid Opening Size: 0.01124 Client Sample #: 13 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/20/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length . ID of Structure N or 7 EDS No (Nonadb F B C M >=05 M >=5(j Chrys Amphibole Nonasb Ambig/ND No Coord <5m Elements)

Struct = > 0.5g >5:1 Aspect Ratio Grid acceptance: •/= Positive diffraction pattern properties conforming to <50% undissolved filter, overtapped or folded Totals laboratory identification critena observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% r-p B C i M i >5u v= EDS spectrum conforming to laboratory holes or opaque areas I

identification criteria observed .amphiboles Chrysotile j i Amphibole I F = Single Fiber Amosite 3 = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous i C = Cluster ;>3 intersectionsj Anthophyllite i Non-Asbestos [ M = Matrix Tremolite Actinoiiie i Non-Idenufied , NSC = No Structures Detected ! !

CITY_21MC100_003103343

NYC-WTC_000183829