TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NY’C BOE Volume (liters): 1920 Lab Group #: 7029 Filter Type / Filter Area: MCE 385 mm" Lab Sample #: 7 Grid Opening Size: 0.01124

Client Sample #: 07 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/11/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Norv EDS (Nonadb No F B C M >=05 p >=5(J Chrys Amphibole Nonasb Ambig/ND _ _ i No Coord <5p Elements)

if II

I-

Struct = > OTp > 5; I Aspect Ratio Grid acceptance; '/= 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% F B C M >5m v'= EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile rAMPHlBOLES I Amphibole F = Single Fiber ; Amosite i B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite i Ambiguous C = Cluster (>3 Intersections) ! Anthophyllite j Non-Asbestos T remolite I M = Matrix Actinolite j Non-Identified NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468465 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181419