TEM Asbestos air sample results, NYC BOE, Aug 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 8759 Filter Type / Filter Area: MCE 385 mm’ Lab Sample # 4 Grid Opening Size: 0 01124 . Client Sample #: 04 Area Examined: 0 04496 mm- GRID BOX: Magnification: 20,000 •GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 8/25/02

Analysis Performed By: ROMAN PEYSAKHOV

GO Structure Structure Type Length ID of Structure N or 7 EDS No (Nonadb F B C M >=05 p :>=5iJ Chrys Amphibole Nonasb Ambig/ND zx No Coord <5u Elements)

I

i -X— I

Struct = > 0 5g >5 1 Aspect Ratio Gnd acceptance 7= Positive diftracbon pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification cntena observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped gnd squares <5% F B C M >5u 7-EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile amphiboles' Amphibole F = Single Fiber Amosite B =. Bundle (<3 fibers <1 liber diameter apart Crocidolite. Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_0 03431222

SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175481