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): 1832 Lab Group #: 7470 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 2 Grid Opening Size: 0.01124 Client Sample #: 05 Area Examined: 0.04496 mm^

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

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Stnjcture NorN EDS No (Nonadb F B C M >=05 M >=5p Chrys Amphibole Nonasb AmbigyND Elements) No Coord <5p

3 c:?

Struct = > 0.5)1 >5:1 Aspect Ratio Grid acceptance: Positive diffraction pattern properties conforming to <50% undissolved filter, overiapped or folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed ■/= EDS spectrum conforming to laboratory identification criteria observed least 20 unfolded or overlapped grid squares <5% holes or opaque areas ____ iz Chrysotile J B C M >5m

AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Arithophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CITY_21MC1OO_OO31O1914

NYC-WTC_000182963