TEM Asbestos air sample results, NYC BOE, Oct 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1952 Lab Group #: 5812 Filter Type / Filter Area: MCE 385 mm* Lab Sample #: 10 Grid Opening Size: 0.01124 Client Sample #: 10 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20 000 GRIDID: # Grid Openings: 4 Accelerating Voltage: 100 KeV

Analysis Performed By: MARK PEYSAKHOV

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

Struct “ > 0.5 p _> 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 C M >5u \'= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile ! AMPHIBOLES Amphibole F = Single Fiber Amosite B - Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) j Anthophyllite Non-Asbestos Tremolite M = Matrix ' Actinolite Nou-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003458994 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179342