Asbestos air analysis results, H.S., April 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1928 Lab Group #: 7333 Filter Type / Filter Area: MCE 385 mm* Lab Sample #: 17 Grid Opening Size: 0.01124

Client Sample #: 20 Area Examined: 0.04496 mm*

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/5/02

Analysis Performed By. MARK PEYSAKHOV

GO, Structure Structure Type Length ID of Structure N or v EDS (Nonacb No Coord No F B cM >=05 p <5u >=6p Chrys Amphibole Nonasb Ambig/ND Elements)

A'" -' >

I

Struct = >0.5p >5:1 Aspect Ratio Grid accepiance:

V= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed least 20 unfolded or orerapsed 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 Elbe- Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-ldentified Actinolite NSD = No Slructures Detectec

CONFIDENTIAL, CITY_21MC1OO_OO3459918 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179538