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): 1920 Lab Group #: 7218 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: too KeV # Grid Openings: 4 Analysis Date: 3/26/02

Analysis Performed By: MARKPEYSAKHOV

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

7“ .2 X .-----c- 3

1 I Struct = > 0.5(1 ,>5:1 Aspect Ratio Grid acceptance: 7= 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 unfoided or overlapped grid squares <5% F B C M >OtJ y= 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 T remolite i M = Matrix Non-Identified i i Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468766 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181649