TEM Asbestos air sample results, NYC BOE, Feb 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume /liters): 1816 Lab Group #: 6843 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: Grid Opening Size: 0.01124

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

GRID BOX: Magnification: 20,000 GRID ID: X. Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/27/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length iD of Structure N or 7 EDS (Nonadb j No F B .C M >=05 p >=5p Chrys Amphibole Nonasb Ambig/ND No Coord Elements) i <5u ------------- 1 f' xiV I 2 X-P-

{t;-

Struct = > 0.5u > 5:1 Aspect Ratio Grid acceptance:

0= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed 0= EDS soectrum conforming to iaboratory least 2C unfolded or overlaoped grid squares <5% holes or opaque areas P B C M >5u

identification criteria observec Clirysotile | 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

CITY_21MC100_003103542

NYC-WTC_000183930