TEM Asbestos air sample results, NYC BOE, Oct 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1936 Lab Group #: 5820 Filter Type / Fitter Area: MCE 385 mm- Lab Sample #: 2 Grid Opening Size: 0.01124 Client Sample #: 2 Area Examined: 0.04496 GRID BOX: Magnification: 20,000 GRID IP: Accelerating Voltage: 100 KeV # Grid Openings: 4

Analysis Performed By: MARK PEYSAKHOV

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

/

Struct = > 0.5(1 >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 =5C% coverage ate least 20 unfolded oroveriapped gnd squares <5% F B C M >6U EDS spectrum conforming to laboratory holes or opaque areas identification critena observed Chrysotile 'amphtooles Amphibole F = Single Fiber Amosite B = Bundle {<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C - Cluster (>3 Intersections) 1 Anthophyllite Non-Asbestos Tremolite M - Matrix Non-Identified Actinolite WSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003459015 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179354