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 filters): 1944 Lab Group #: 6010 Filter Type / Filter Area: MCE 385 mm’ Lab Sample #: 18 Grid Opening Size: 0.01124

Client Sample #: 18 Area Examined: 0.04496 mm’

GRID BOX: Magnification: 20,000 GRIP ID: Accelerating V oltage: 100 KeV # Grid Openings: 4 Analysis Date: 12,/l/01

.Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or EDS (Nonadb No F B C >=05 p Chrys AmphiDole NonasD Ambig/ND No Coord <5p Elements)

a

Struct = > 0.5p .> 5:1 Aspect Ratio Grid acceptance:

V= Positive diffraction pattern properties conforming to <;50% undissDlved filter, overlapped pr folded Totals labo-atory identification criteria observed <13% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F B C M >5p EDS spectrum conforming to laboratory holes or opaque areas identification criteria ooserved Chry'sotile AMPHIBOLES Amphibole r = Single Fiber I Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Bluster (>3 Intersections) Anthophyllite Non-Asbestos i Tremolite M = Matrix Non-Identified I Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003458573 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179278