TEM asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1920 Lab Group #: 6940 Filter Type / Filter Area: MCE 385 mm- Lab'Sample #: 6 Grid Opening Size: 0.01124

Client Sample #: 06 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20.000 GRID LD: Accelerating Voltage: 100 KeV ■ # Grid Openings: 4 Analysis Date: 3/5/02

Analysis Performed By: MARK PEYSAKHOV

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

■7-

Struct = > 0.5|J > 5:1 Aspect Ratio Grid acceptance: 9= 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% M I >5p G EDS spectrum conforming to laboratory identification criteria observed holes or opaque areas Chrysotile Lil C

AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous e = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468322 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181322