TEM Asbestos air sample results, NYC BOE, Jan 2002

NYC 9/11 Public Portal Document ■

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840. Lab Group #: , 6409 Filter Type I Filter Area: MCE 385 mn? Lab Sample #: 4 Grid Opening Size: 0.01124 Client Sample #: 04 Area Examined: 0.04496 mm"

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 1/23/02

Analysis Performed By: Emarkpeysakhov

GO. Structure Structure Type Length ID of Structure Norv EDS (Nonadb No F B C M >=05 M >=5p Chrys Amphibole Nonasb Ambig/ND No Goord Elements) <5u

O I -

-

____ Struct -> 0.5^1-> 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 >5|j ■ ■/= EDS spectrum conforming to laboratoiy holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES i Amphibole F = Single Fiber Amosite j B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite ■ : Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite i M = Matrix • Actinolite' ■ Non-Identified NSD = No Structures Detectec

CONFIDENTIAL, SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008 CITY_21 MC100_014660207

NYC-WTC_000174774