TEM Asbestos air sample results, NYC BOE, Dec 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters); 1936 Lab Group #: 6038 Filter Type / Filter Area: MCE 385 mm" Lab Sample #: 14 Grid Opening Size: 0.01124 Client Sample #: 14 Area Examined: 0.04496 mm" GRID BOX: Magnification: 20,000 GRIDED: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 12/5/01

Analysis Performed By: MARK PEYSAKHOV

Structure Structure Type Length ID of Structure N or 't EDS No (Nonadb B C M =05 u >=5p Chrys Amphibole Nonasb Ambig/ND Nc Coord <5u Elements)

z!?

Struct = > 0.5p > 5:1 Aspect Ratio Grid acceptance: 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 >5U EDS spectrum conforming to laboratory holes or opaque areas identification critena observed Chrvsotile AMPHIBOLES • Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 riber diameter apart Crocidolite Ambiguous C = Custer (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CITY_21MC1OO_OO31O45O6

NYC-WTC_000184010