TEM Asbestos air sample results, NYC BOE, Aug 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1936 Lab Group #: 8760 Filter Type / Filter Area: MCE 3g5mm- Lab Sample 3: 9 Grid Opening Size: 0.01124 Client Sample #: 9 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 8/25/02

Analysis Performed By; /gfO ROMAN PEYSAKHOV

; GO. Structure structure Type Length ID of Structure N or 9 EDS (Nonadb No F B C M >=05 (J >=5pj Chrys Amphibole 1 Nonasb Ambig/ND No Coord <5p 1 Elements)

yy J

32^— t

Struct = > 0.5|u ,> 5:1 Aspect Ratio Grid acceptance: 7= 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 grid squares <5% F B C M >5p /= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 liber diameter apart Crocidolite Ambiguous C = Cluster (>3 intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD - No Structures Detected

CONFIDENTIAL, CITY_21MC100_003430362 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175144