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 #: 7 Grid Opening Size: 0.01124 Client Sample #: 07 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 Structure Type Length ID of Structure N or N EDS No >=05 p (Nonadb F B C M >=5)J Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

fez vtSi Cl 21

Struct = > 0.5 p -> 5:1 Aspect Ratio Grid acceptance: '/= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% paniculate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5p '1= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile ; AMPHIBOLES i 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

CONFIDENTIAL, CITY_21MC100_003470673 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176656