TEM asbestos air sample results, NYC BOE, Feb 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1952 Lab Group #: 6840 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 5 Grid Opening Size: 0.01124 Client Sample #: 05 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/27/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 9 EDS ’ No’ (Nonadb j F B C >=05 p Chrys Amphibole 'Monasb Ambig/ND No Coord <5p Elements) ■

______ Struct = > 0 5|i > 5:! Aspect Ratio Grid acceptance; 9= Positive diffraction pattern properties conforming to <50% utidissolved filter, overlapped or folded Totals laboraiciry identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5u 9= EDS spectrum conforming to laboratory holes or opaque areas identification criteria ooserved 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 i Non-Identified Actinolite NSD = No Structures Detected I. i

CONFIDENTIAL, CITY_21MC100_003468181 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181231