TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: N YC BOE Volume niters): 1840 Lab Group #: 7444 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 7 Grid Opening Size: 0.01124 Client Sample #: 07 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRIDID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/17/02

Analysis Performed By: r\// ROMAN PEYSAKHOV

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

I

7 IL ((

Struct = > 0.5h > 5:1 Aspect Ratio Grid acceptance:

y = Positive diffraction pattern croperties 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 i C I M i >5m 1= EDS spectrum conforming to laboratory holes or opaque areas —i----------______ I identification criteria observed Chrysotile I AMPHIBOLES Amphibole r = Single Fiber Amosite B = Bunole (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster i>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Malrx i Non-Identified Actinolite NSC = No Structures Detectec

CONFIDENTIAL, CITY_21MC100_0 03471110 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176951