TEM Asbestos air sample results, NYC BOE, Feb 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 6787 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 1 Grid Opening Size: 0.01124

Client Sample #: 1 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/23/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Nor v' EDS No (Nbnadb F B C >=05 p :>=5|j Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

I.. .■

Struct = > 0.5p >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 >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B >5u C M 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) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468097 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181179