TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1808 Lab Group #: 7111 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 12 Grid Opening Size: 0.01124

Client Sample #: 15 Area Examined: 0.04496 mm=

GRID BOX: Magnification: 20,000 GRIDID: .3 Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/17/02

Analysis Performed By: MARK PEYSAKHOV

Length ID of Structure N or 7 EDS GO, Structure Structure Type (Nonadb No F B C M >=05 p >=5jj Chrys Amphibole Nonasb Ambig/ND No Coord Ele.merits) <5p

Struct = > 0,5u .>5:1 Aspect Ratio H Grid acceptance:

2 = 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 >5p y= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite Ambiguous B = Bundle (<3 fibers <1 fiber diameter apart C = Cluster (>3 Intersections! M = Matrix Crocidolite Anthophyllite Tremolite Actinolite Non-Asbestos Non-ldentified | l__. H i i NSD = No Structures Detected

CITY_21MC100_003102610

NYC-WTC_000183429