TEM Asbestos air sample results, NYC BOE, Dec 2001

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NY’C BOE Volume (liters): 1928 Lab Group #: 6051- Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 12 Grid Opening Size: 0.01124 Client Sample #: 1T Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 12/6/01

Analysis Performed By: MARK PEYSAKHOV

GO. Structure ■ Structure Type Length ID of Structure N or N EDS No >=05 p Amphibols Nonasb Ambig/ND (Nonadb I- B C M >=5p Chrys Nc Coord <6p Elements)

Struct = > 0.5p > 5:1 Aspect Ratto Gria acceptance: 4= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification critena observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F i B I C M >5|j \= EDS spectrum coniorming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Sundle (<3 fibers <1 fiber diameter apart Crocidolite ! Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos I M = Matrix Tremolite Actinolite Non-Identified NSC = No Structures Detected

CITY_21MC100_003104533

NYC-WTC_000184029