TEM Asbestos air sample results, NYC BOE, June 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters); 1832 Lab Group #: 8242 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 11 Grid Opening Size: 0.01124

Client Sample #: 13 Area Examined; 0.04496 mm^

GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 6/23/02

Analysis Performed By; MARK PEYSAKHOV

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

A

Struct = > 0.5p >5:1 Aspect Ratio Grid acceptance: J = Positive diffraction pattern properties conforming to <50% undtssolved Rlter, overiapped 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 4= EDS spectrum conforming to laboratory holes or opaque areas idenffication criteria observed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos Tremolite’■ M = Matrix Non-ldentified Actinolite NSO = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003 461770 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000179893