TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 7431 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 6 Grid Opening Size: 0.01124

Client Sample #: 06 Area Examined: 0.04496 mm*

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/16/02

Analysis Performed By: MARK PEYSAKHOV

GO^ Structure Structure Type Length ID of Structure N or v EDS (Noradb No F 8 C M >-05 u >=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5m Elements)

1 ! 1 i i 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% particuiate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C I M ; >5p \= EDS spectrum conforming to laboratory holes or opaque areas Identification criteria observed Chrysotile ! I AMPHIBOLES Amphibole I i F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 intersections! Anthophyllite Non-Asbestos i Tremolite M = Matrix Non-Identified Actinolite J NSO = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471090 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176939