TEM Asbestos air sample data, Sample 8, March 2002

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 7247 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 8 Grid Opening Size: 0.01124

Client Sample #: 08 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/28/02

Analysis Performed By: MARK PEYSAKHOV

GO. I Structure Structure Type Length ID of Structure N or '/ EDS (Nonadb No F B C >=05 u Chrys Amphibole Nonasb Ambig/ND No Coord <5|j Elements)

3.

Struct = > 0.5p > 5:1 Aspect Ratio Grid acceptance:

\'= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals <10% particuiate coverage >50% coverage ate laboratory identificafion criteria observed least 20 unfolded or overlapped gnd squares <5% F B C M >5U ^f= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Clirysotile AMPHIBOLES I Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos T remolite M = Matrix Actinolite Non-ldentified L NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468794 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181685