TEM Asbestos air sample results, NYC BOE, Nov 2001

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Ciient Name: NYC BOE Volume filters): 1936 Lab Group #: 5975 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: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 11/27/01

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type j Length ID of Structure N or BOS No (Nonadb F B C M >=05 u >=5(j Chrys Amphibole Noitasb Ambig/ND Coord <5u Elements)

2. ^5- JL JL //

2^

Struct = > 0.5)1 >5:1 Aspect Ratio Grid acceptance: 7= Fesitive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria observed - <10% particulate coverage >50% coverage ate

yA EDS spectrum conforming to laboratory least 20 unfolded or overlapped grid squares <5% doles or opaque areas F B c M >5u identification criteria observeo Chrysotile ) amphiboles Amphibole F = Single Fiber I Amesite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos I Tremolite M = Matrix Non-Identified Actinolite NSD = No Structures Delected

CONFIDENTIAL, CITY_21MC100_003458447 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179201