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): 1920 Lab Grogp #: 6821 Filter Type / Filter Area: MCE 385 mm- Lab Sample #: 10 Grid Opening Size: 0.01124

Client Sample #: 10 Area Examined: 0.04496 mm-

GRID BOX: Magnification: 20,000 GRID IP- Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 2/24/02

Analysis Performed By: ROMAN PEYSAKHOV

GO. Structure Structure Type Length IDofStruaure N or 4 EDS ! No (Nonadb I F B C M TToTiL r •=5|J Chrys Amphibole Nonasb Ambig/ND _ No Coord <5u Elements) i ------------ i 1^ 1/ _Jl__ h 2^----------

Struct = >0.5p >5:1 Aspect Ratio Grid acceptance: PosiSve diffraction pattern propertes confomiing to "50% undissolved niter, 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 Chiysotile 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_21MC100_003468146 SUBJECT TO PROTECTIVE ORDER NO, 2, SEPT, 2008

NYC-WTC_000181218