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 filters): 1920 Lab Group #: 6598 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 9 Grid Opening Size: 0.01124 Client Sample #: 09' Area Examined: 0,04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/8/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 4 EDS No (Nonadb F B C >=05 p Chrys Amphibole Norrasb Ambig/ND No Coord <5p Elements)

3^

I -

i 1 I ' 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 I C M >5p EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile I AMPHIBOLES [ Amphibole F = Single Fiber i Amosite i B = Bundle (<3 fibers <1 fiber diameter apart ! Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos M = Matrix Tremolite Actinolite ; Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003467799 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180970