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): 1816 Lab Group #: 7249 Filter Type / Filter Area: MCE 385 mm* Lab Sample #: 14 Grid Opening Size: 0.01124

Client Sample #: 17 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/28/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or 7 EDS (Nonadb No F B C M >=05 p >=5p Chrys Amphibole Nonasb Ambig/ND No Coord <5p Elements)

7^'

Struct = >0.5p >5:1 Aspect Ratio Grid acceptance: N = Positive diffraction pattern properties confomring to ^^0% undissolved filter, overlapped or folded Totals :10% particulate coverage >50% coverage ate laboratory identification criteria observed least 20 unfolded or overlapped grid squares <5% F j B C M >5p V: EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile ) .AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Actinolite Non-ldentified NSD = No Structures Detected

CITY_21MC100_003102890

NYC-WTC_000183630