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): 1920 Lab Group #: 7494 Filter Type / Filter Area: MCE 385 mm’ Lab Sample #: 12 Grid Opening Size: 0.01124 Client Sample #: 12 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/21/02

Analysis Performed By: MARK PEYSAKHOV

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

L_i

Struct = > 0 5u >5:1 Aspect Ratio Grid acceptance:

v= 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% ) j F j B I C I M , >50 \'= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile T ■AMPHIBOLES Amphibole I = Single -oer Amosite B = Bundle (<3 fibers <1 fcerciarneter apart Crocidolite Ambiguous ' '----------------- r---------- i C = Cluster (>3 Intersections) Anthophyllite Son-Asbestos Tremolite M = Matrix Non-ldentified Actinolite MSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_0 03471180 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177004