TEM asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1936 Lab Group #: 5844 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 4 Grid Opening Size: 0.01124

Client Sample #: 4 Area Examined: 0.04496 mm- GRID BOX: 57 7 Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/7/01

Analysis Performed By: ROMAN PEYSAKHOV

GO, Structure Structure Type Length ID of Structure N or v EDS (Nonadb No F B I C M >=05 p >=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

5/9 5 7 7. u If TV /l

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Struct = >0.5p > 5:1 Aspect Ratio Grid acceptance; <)= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Tofirk laboratory identification criteria observed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped gnd squares <5% F B i C M >5p y = EDS spectrum coniorming to laboratory holes or opaque areas icentitlcation criteria ooserved Clirysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Nom Asbestos Tremolite M = Matrix Actinolite ^Lon-.lderitiiTed NSD = No Structures Detected I.

CONFIDENTIAL, CITY_21MC100_003459129 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179411