TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 7483 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 11 Grid Opening Size: 0.01124 Client Sample #: 11 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: 7,-' Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/20/02

Analysis Performed By: /\^i ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure Nor V EDS 1 No (Nonadb i F B C M >=05 M >=5p Chrys Amphibole Nonasb Ambig/ND Elements) I % No Coord <5|J / WB __ L /Rf _JL_- —Z— C__

Struct = > 0 5|u > 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 gnd squares <5% F ! B C i M i >5u V= EDS spectrum conforming to laboratory holes or opaque areas identificat.on criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersectionsl Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified ' Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003471201 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177019