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): 1880 Lab Group #: 7278 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: 3/31/02

Analysis Performed By: , ROMAN PEYSAKHOV

GO. Structure Stnjcture Type Length ID of Structure N or V EDS No >=05 p Amphibole Nonasb (Nonadb F B C M >=5p Chrys Ambig/ND Coord <5p Etemente}

/ Z 7 IA/> 3 F —-

Struct = > 0.5p > 5:1 Aspect Ratio Grid acceptance: '/= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification oriferia observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M ’/= EDS spectrum conforming to iaboratory holes or opaque areas identification criteria observed Chrysotile iAMPHiBOL^I Amphibole F = Single Fiber j Amosite | B = Bundle (<3 fibers <1 fiber diameter apart I Crocidolite Ambiguous - C = Cluster (>3 Intersections) : Anthophyllite j Non-Asbestos i Tremolite M = Matrix Non-ldentified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003470670 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176653