TEM Asbestos air sample results, NYC BOE, Dec 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1908 Lab Group #: 6015 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 13 Grid Opening Size: 0.01124

Client Sample #: 13 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRIDED: 33 Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 12/1/01

Analysis Performed By; ROMAN PEYSAKHOV

GO, Structure StructureType Length ID of Structure N or N EDS (Nonadb No ■ ' B' j C ' ■M F >=05 |j >=5|j Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

Ci J? Zf

3^ -----

I 1 Struct = > 0.5u -> 5:1 Aspect Ratio Grid acceptance:

V= Positive diffraction pattern properties conforming to <50% undissolved niter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed least 20 unfolded or overlapped grid squares <5% F I B C M { >5u EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile ! AMPHIBOLES ' Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) i Anthophyllite Non-Asbestos Tremolite i M = Matrix ■ Actinolite ! Non-Identined NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003467339 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180662