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): 1920 Lab Group #: 6976 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 9 Grid Opening Size: 0.01124 Client Sample #: 09 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/8/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 7 EDS No (Nonadb F I B C M >=05 u : '=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5m Elements) ! 4

J

I

Struct = >0.5u >5;l Aspect Ratio Grid acceptance: a/= Positive diffraction pattern properties conlorming to "50% undissolved filter, overiapped 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 >5u A- EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Clirysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster l>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-ldentified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468367 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181353