TEM Asbestos air sample results, NYC BOE, Dec 2001

NYC 9/11 Public Portal Document

TEM Asbestos fair) Count Sheet Client Name: NYC BOE Votnme (liters): 1936 Lab Group #: 6010 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 20 Grid Opening Size: 0.01124

Client Sample #: 20 Area Examined: 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 12/1/01

Analysis Performed By: MARK PEYSAKHOV

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

J? Y

r

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

CONFIDENTIAL, CITY_21MC100_003458575 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179279