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 (liters): 1805 Lab Group #: 7540 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 12 Grid Opening Size: 0.01124

Client Sample #: 12 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/27/02

Analysis Performed By: MARK PEYSAKHOV

GO, Structure Structure Type Length 10 of Structure N or 7 EOS No (Nonadb F B C M >=05 p >=5)0 Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

3

Struct = > 0.5,u >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 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 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detecteo

CONFIDENTIAL, CITY_2IMCl0 0_0 019 0 2 313 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT, 2008 NYC-WTC_000178534