TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NTC BOE yolume£Iiters}; 1944 Lab Group 7412 Filter Type / Filter Area: MCE 385 mm- Lab Sample 13 Grid Opening Size: 0.01124 Client Sample #: 13 ■Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Pate: 4/14/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or V EDS (Nonadb No F 8 C M >=05 p >=5(j Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

2--

Struct = > 0.5p >5:1 Aspect Ratio Grid acceptance; 9= Positive diffraction pattern properties conforming to <50% undissolved lilter, overiapped ar folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed '/= EDS specbum conforming to laboratory least 20 unfolded or overlapped gnd squares <5% F B c M >5|J holes or opaque areas identification criteria observed 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 = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_009505460 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000178923