TEM asbestos air sample results, NYC BOE, June 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1800 Lab Group #: 8178 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 11 Grid Opening Size: 0.01124 Client Sample #: Area Examined: 0.04496 mm* GRID BOX: Magnification: 20 000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 6/19/02

Analysis Performed By: ROMAN PEYSAKHOV

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

Struct = >0.5p >5:1 Aspect Ratio Grid acceptance: ^1= Positive diffraction pattern properties conforming to <50% undissolved filter, overiapped or folded Totals laboratory identification criteria obsenred <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5p '/= EDS spectrum conforming to laboratory holes or opaque areas identilication 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 T remolite M = Matrix Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003461674 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179830