TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume (liters): 1840 Lab Group #: 7370 Filter Type / Filter Area: MCE 385 mm^ Lab Sample #: 5 Grid Opening Size: 0.01124 Client Sample #: 05 Area Examined: 0.04496 mm- GRID BOX: Magnification: 20,000 GRID ID: - ----------- Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/10/02

Analysis Performed By: MARK PEYSAKHOV

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

i

~ I Struct = > 0.5p >5:1 Aspect Ratio Grid acceptance:

v= Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Totals laboratory identification criteria obsen/ed <10% particulate coverage >50% coverage ate least 20 unfolded or overlapped grid squares <5% F C M I >5u i/= EDS spectrum conforming to laboratory B holes or opaque areas ----- 1------- 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 = Nc Structures Detected

CONFIDENTIAL, CITY_21MC100_0 03470955 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176847