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 #: 6940 Filter Type / Filter Area: MCE 385 mm- Lab'Sample #: 9 Grid Opening Size: 0.01124

Client Sample #: 09 Area Examined: 0 04496

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/5/02

Analysis Performed By: MARK. PHYSAKHOV

GO Structure Structure Type Length ID of Structure Nor 9 EDS _______ I (Nonadb No F LB C M >=05 p '=5p Chrys Amphibole Nonasb Ambig/ND i No Coord <5p Elsmen(s)

Z P

Struct = > 0.ip >5:1 Aspect Ratio Grid acceptance: 4= 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% 3 3 V= EDS spectrum conforming to laboratory - I P M holes or opaque areas identification criteria' observed Chrysotile I __________ i AMPHIBOLES ■Amphibole j F < Single Fiber Amosite ■ B < Bundle (<3 fibers <1 liber diameter apart Crocidolite I Ambiguous ) C = Cluster (>3 Intersections) Anthophyllite j Non-Asbestos ] Tremolite M = Matrix i Non-Identified ’ Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO3468325 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181325