Asbestos fiber analysis results, H.S. of Economics & Finance, Apr

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1928 Lab Group #: Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 12 Grid Opening Size: 0.01124

Client Sample #: 14 Area Examined: 0.04496

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 Ke V # Grid Openings: 4 Analysis Date: 4/7/02

Analysis Performed By: MICHAEL GORYCKl

GO. Structure Structure Type Length ID of Structure Nor v EDS {Ncnadb No F B C M l~ =5p Chrys Ampnibole Nonasb Ambig/ND No Coord Elements)

f l/Z 4/22 , XV: A -

Struct = > 0.5p >5:1 Aspect Ratto Grid acceptance:

A Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals <10% particulate coverage >50% coverage ate laooratory identification criteria observed least 2C unfolded or overlapped grid squares <5% 1 F B C M ) >5u '/= EDS spectrum conforming to laboratory holes orooaque areas identification criteria observed Chrysotile amphiboles Amphibole r = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix i Non-ldentified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_0 03459961 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179556