TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: HYC BOE Volume (liters): 1840 Lab Group #: 7370 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 3 Grid Opening Size: 0.01124 Client Sample #: 03 Area Examined: 0.04496 mm^ GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: too KeV # Grid Openings: 4 Analysis Date: 4/10/02

Analysis Performed By: MARK PEYSAKHOV

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

/ 'A'?'

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

Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laboratory identification criteria observed least 20 unfolded or overtapped grid squares <5% F B C M I >5o v'= EDS spectrum conforming to laboratory holes or opaque areas Identification criteria obsen/ed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite 8 = 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

CONFIDENTIAL, CITY_21MC100_0 03470953 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176845