TEM asbestos air sample results, NYC BOE, Feb 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NY'C BOE Volume (liters): 1960 Lab Group #: 6840 Filter Type / Filter Area: MCE 3S5 mm- Lab Sample #: I Grid Opening Size: 0.01124

Client Sample #: 07 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'" >=05^1”) : TNonadb F B C M >=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

: •— z

Struct = > 0,5g >5:1 Aspect Ratio Grid acceptance: '/= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed <10% particulate coverage >50% coverage ate

'/= EDS spectrum conforming to laboratory least 20 unfolded or overlapped grid squares <5% holes or opaque areas Tf B CT M >5u 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 = Matrix' Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO3468183 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT, 2008

NYC-WTC_000181233