TEM Asbestos air sample results, NYC BOE, Mar 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1936 Lab Group #: 7136 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 6 Grid Opening Size: 0.01124 Client Sample #: 6 Area Examined: 0.04496 mm" GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV #GridOpcning^ 4 Analysis Date: 3/19/02

Analysis Performed By: MARK PEYSAKHOV

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

Struct = > O.Sfi _> 5; 1 Aspect Ratio Grid acceptance: 4^ 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 >5m EDS spectrum conforming to laboratory holes or opaque areas identification 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-Identified Actinolite NSD = No Structures Detected

CONFIDENTIAL, CITY_21MC1OO_OO3466896 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000180369