TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume filters): 1840 Lab Group #: 7431 Filter Type / Filter Area: MCE 385 mm= Lab Sample #: 3 Grid Opening Size: 0.01124 Client Sample #: 03 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/16/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure type Length ID of Structure N or < EDS No (Nonadb F B C M >=05 M i>=5kJ Chrys Amphibole Nonasb Ambig/ND No Coord <5|J Elements)

J?

Struct - > 0.5n >5:1 Aspect Ratio Grid acceptance:

v= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped gnd squares <5% F B C ( M ; >5u V= EDS spectrum conforming to laboratory 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 = Matnx Non-Identified j Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471087 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176937