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 #: 6747 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 GRID ID: 3 A Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/20/02

Analysis Performed By: MARK PEYSAKHOV .

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

Struct = > 0.5p > 5:1 Aspect Ratio Gnd acceptance;

7= Positive diffraction pattern properties conforming <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 C M i >5|j 'J= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Clu-ysotile AMPHIBOLES Amphibole F = Single Fiber Amosite 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_003468050 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181154