TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 7483 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: Magnification: 20,000 GRIDID: Accelerating Voltage: too KeV # Grid Openings: 4 Analysis Date: 4/20/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or V EDS I No (Nonadb j F B C M >=05 p >=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5m Elements) I

-4___ li

I I Struct = > ().5p >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 ale least 20 unfolded or overlapped grid squares <5% F bTc M ! >5u V - EDS spectrum conforming to laboratory holes or opaque areas Identification critena observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite i 1 3 = Bundle ''3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Clusier (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = Nc Structures Detected

CONFIDENTIAL, CITY_21MC100_003471193 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177011