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): 1936 Lab Group #: 7185 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 7 Grid Opening Size: 0.01124 Client Sample #: 2 Area Examined: 0.04496 mm^ GRID BOX: 9(fr Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/23/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure NorN EDS No (Nonadb F B C M i >=05 p >=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

I

Struct = >0.5p >5:1 Aspect Ratio Grid acceptance: 4= Positive diffraction pattern properties conforming to undissolved filter, overtapped or folded Totals 1,^ P. laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5u EDS spectrum conforming to laboratory holes or opaque areas idenlifrcation criteria observed Chrysotile . AMPHIBOLES j Amphibole F = Single Fiber Amosite 8 = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) ' Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified i Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003467012 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180447