TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE VolumeJIitersli 1920 Lab Group #: 7494 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 15 Grid Opening Size: 0,01124

Client Sample #: 15 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20.000 GRIDID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/21/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or EDS ! (Nonadb j No F B C >=05 p >=5(0 Chrys Amphibole Nonasb Ambig/ND No Coord <5m Elements) 1 1

J-

Struct = > 0.5p > 5; I 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 ovenappec grid squares <5% F M : >5u \= EDS spectrum conforming to laboratory B I C holes or opaque areas loentificaticn criteria obsen/eci Chrysotile AMPHIBOLES Amphibole F = Sirgie Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster f>3 Intersections) Anthophyllite Non-Asbestos ' Tremolite M = Matrix Actinolite i Son-Identified NSD = No Structures Cetected

CONFIDENTIAL, CITY_21MC100_003471183 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177007