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 (liters): 1840 Lab Group #: 7203 Filter Type / Filter Area: MCE 385 mm'- Lab Sample #: 5 Grid Opening Size: 0.01124 Client Sample #: 05 Area Examined: 0.04496 mm^

GRID BOX: iTL Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 3/25/02

Analysis Performed By: ROMAN PEYSAKHOV

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

F - 4__

Struct = >0.5p >5:1 Aspect Ratio Grid acceptance: y/- 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 AMPHIBOLES Amphibole F = Single Fiber Amosite i B = Bundle (<3 fibers <1 fiber diameter apart Crocirdolite ) Ambiguous C = Cluster (>3 Intersections) Anthophyllite j Non-Asbestos Tremolite M = Matrix Actinolite I Non-Identified ! NSD = No Structures Detected _____________ J_-..

CONFIDENTIAL, CITY_21MC100_0 03470563 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176591