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): 1920 Lab Group #: 6940 Filter Type / Filter Area: MCE 385 mm- Lab'Sample 8 Grid Opening Size: 0.01124

Clien£SiUTij3le^ 08 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/5/02

*“ ____ ■

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or EDS i No =3: 3 r : ■=5m (Nonadb I F B C M Chrys Amphibole Norasb Ambig/ND No Coord <5p Elements) ;

3

Struct = > 0.5p >5:1 Aspect Riitio Grid acceptance:

Positive diffraction pattern properties conforming to <50% undissQlved filter, overlapped or folded Tot^ ladoratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% f F B C M >5p 4= EOS spectrum conforming to laboratory holes or opaque areas identification criteria observec Chrysotile 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 c Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468324 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181324