TEM asbestos air sample results, NYC BOE, Jan 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1936 Lab Group #: 6418 Filter Type / FUter Area: MCE 385 mm- Lab Sample #: Grid Opening Size: 0.01124 Client Sample #: 07 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRID ID: S-ZZ/t Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 1/24/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Norv EDS No Amphibole (Nonadb F B C >=05 p Chrys Nonasb Ambig/ND No Coord ' <51J Elements)

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Struct = > 0.5n >5:1 .Aspect Ratio Grid acceptance: 'i= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria obsen/ed <10% particulate coverage >50% coverage ate

V= EDS spectrum conforming to laboratory least 20 unfolded or overlapped grid squares <5% holes or opaque areas Tf B C I M >5u identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) i Anthophyllite Non-Asbestos I \ T remolite M = Matrix Non-Identified । Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003467494 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180765