TEM grid data sheet, sample 10, Jan 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet 'Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 6398 Filter Type / Filter Area: MCE 385 mnY Lab Sample #: 10 Grid Opening Size: 0.01124

Client Sample #: 10 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 1/22/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or EDS Nc >=05 u i>=5p Amphibole Nonasb (Nonadb F B C M Ctirys Ambig/ND No' Coord <5p Elemenls)

Struct = > 0.5p > 5:1 .Aspect Ratio Grid acceptance: A- Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification ciitena observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C j M >5u 7= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile i AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle {<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbesros Tremolite M = Matrix Actinolite Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003433525 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175812