TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume niters): 1936 Lab Group #: 7099 Filter Type / Filter Area: MCE 385 Lab Sample #: 3 Grid Opening Size: 0.01124 Client Sample #: 06 Area Examined: 0.04496 mnr GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: too KeV # Grid Openings; 4 Analysis Date: 3/16/02

Analysis Performed By: ROMAN PEYSAKHOV

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

2L 4-

Struct = > 0.5(1 .> 5:1 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 >5u EDS spectrum conforming to laboratory holes or opaque areas identification criteria observed Chrysotile

F = Single Fiber ! amphibol'es Amosite 1I Amphibole Ambiguous 8 = Bundle (<3 libers <1 fiber diameter apart Crocidolite C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos T remolite M = Matrix Non-ldentified Actinolite NSD - No Structures Detected

CONFIDENTIAL, CITY_21MC100_003468570 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181494