TEM Asbestos air sample results, NYC BOE, Feb 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1944 Lab Group #: 6645 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 8 Grid Opening Size: 0.01124 Client Sample #: 8 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRIDED: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/12/02

Analysis Performed By; MARK PEYSAKHOV

GO, Structure Structure Type Length ID of Structure N or V EDS [ No (Nonadb i F B C M >=05P I Chrys Amphibole Nonasb Ambig/ND Elements] ■ No Coord <5p I ----------- 1

i

Struct = ? 0.5(i > 5; I Aspect Ratio Grid acceptance: V = 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 ' amphiboleFi Amphibole F = Single Fiber : Amosite B = Bundle (<3 fibers <1 fiber diameter apart i Crocidolite Ambiguous C = Cluster (>3 Intersections) : Anthophyllite Non-Asbestos Tremotite M = Matrix Non-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003467882 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000181031