TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Ctieiit Name: NYC BOE Volume lliters): 1920 Lab Group #: - 6872 Filter Type / Filter Area: MCE 3S5 mm- Lab SampleJ^ 11 Grid Opening Size: 0.01124

Client Sample #: 11 Area Examined: 0.04496 mm-

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

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 7 EDS (Noradb No F B C M >=05 p >=5(j Chrys Amphibole Nonasb Ambig/ND No Coord <5u Elemenls;

.-23 X J - zzytz zZ

Struct = > 0.5p >5:1 Aspect Ratio Grid acceptance;

7= Positive diffraction pattern properties conlorming to <50% undissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed least 20 unfolded or overlapped grid squares <5% f F B C V|j v/= EDS spectrum conforming to laboratory holes or opaque areas L Chrysotile ----- !------ identification criteria observed AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle i<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Attthophyllite . Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Slructures Detected

CONFIDENTIAL, CITY_21MC100_003468227 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181262