Asbestos air analysis results, H.S., April 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1928 Lab Group #: 7333 FilteFTvpe / Filter Area: MCE 385 mm- Lab Sample #: 11 Grid Opening Size: 0.01124 Client Sample #: 14 ATea Exramin^ 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/5/02

Analysis Performed By: MARK PEYSAKHOV

GO. Structure Structure Type Length IC of Structure N or 'Z i EDS No F B C M >=05 u >=5p Chrys Amphibole Nonasb Ar-CiVA No Coord <5pj ! Elements)

'7 :

M I

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

9= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laooratory identification criteria observed <10% particulate coverage >50% coverage ate

V= EDS spectrum, conforming to laboratory least 20 unfolded or overlapped end squares <5% [ F B C II M >5u holes or opaque areas identification criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous j C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos [ Tremolite M = Matrix Non-ldentified i NSD = No Structures Delected Actinolite i i

CONFIDENTIAL, CITY_21MC100_0 03459912 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179532