TEM Asbestos air sample results, NYC BOE, May 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters); 1920 Lab Group #: 7913 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 14 Grid Opening Size; 0.01124

Client Sample #: 14 Area Examined: 0.04496 mm" GRID BOX: Magnification: 20 000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date; 5/30/02

Analysis Performed By: —------- a-

MARKPEYSAKHOV

GO. Structure structure Type Length ID ol Structure Norv EDS No (Nonadb F B C M >=05 p >=5p Chrys Amptibole Nonasb Ambig/NO No Coord <5p Elemenb)

Struct = > 0.5n > 5; I Aspect Ratio Grid acceptance: ’/= Positive diffraction pattern properties confonning to <50% undissolved fitter, overlapped or folded Totals laboratory Identification criteria observed <10% particulale coverage >50% coverage ate

’/= EOS spectrum conforming to laboratory least 20 unfolded or oveilapped grid squares <5% holes or opaque areas F B c M >5m identification criteria observed Chrysotile AMPHIBOLES Anqjhibole F = Single Fiber Amosite B = Bundle (<3 libers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster {>3 Intersections) Anthophyllite Non-Asbestos Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CITY_21MC100_003105232

NYC-WTC_000184513