TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 6928 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 3 Grid Opening Size: ~ 0.01124

Client Sample #: 03 Area Examined: 0,04496 mm-

GRID BOX: 5^2. Magnification: 20,000 GRID ID: ■Accelerating Voltage: 100 KeV # Grid Onenings: 4 ■Analysis Date: 3/4/02

Analysis Performed By: ROMAN PEYSAKHOV

GO, ] Structure Structure Type Length ID of Structure N or N EDS INonadb i No T Coord I No.... fTb c M >=05 M <5p Chrys Amphibole Nonasb Ambig/ND Elemenis) ' 52 n T(

Struct = > 0.5|j > 5:1 .Aspect Ratio Grid acceptance: v= 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 I >5u 9= 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) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468299 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181305