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): 1805 Lab Group #: 7503 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 GRID ID: Accelerating Voltage: too KeV # Grid Openings: 4 Analysis Date: 4/22/02

Analvsis Performed Bv: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or V EOS No (Nonadb F B C M >=05 M >=5p Chrys Amphibole Nonasb Ambig/ND _ No Coord <5u Elements)

~~t7__ K

4'*

! !

Struct = > 0,5(1 > 5:1 A,spect Ratio Grid acceptance:

\= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria boserved <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% f F B* C ' M i >5p \ = EDS spectrum conforming to laboratory holes or opaque areas laentificatior criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber d ameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix I Non-Identified Actinolite NSD = No Structures Detected I ___ .

CONFIDENTIAL, CITY_21MC100_0 03471226 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177034