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 #: 7110 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 4 . Grid Opening Size: 0.01124

Client Sample #: 06 Area Examined: 0.04496

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/17/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure' N or 7 EDS No >=05 |j (Nonadb F B C >=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

<3

Struct = >0.5p >5:1 Aspect Ratio Grid acceptance: V= 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 r/= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile amphiboles"] Amphibole F = Single Fiber I Amosite B = Bundle (<3 fibers <1 fiber diameter apart ' Crocidolite Ambiguous C = Cluster (>3 Intersections) I Anthophyllite Non-Asbestos Tremolite M = Matrix Non-ldentified Actinolite MSD = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO3468595 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181512