TEM Asbestos air sample results, NYC BOE, Apr 2002

NYC 9/11 Public Portal Document

J *1 TEM Asbestos (air) Count Sheet Client^iatlQe: NYC BOE Volume (liters): 1840 Lab Group #: 7503 Filter Type / Filter Area: MCE 385 mm’ Lab Sample #: Grid Opening Size: 0.01124

Client Sample #: 02 Area Examined: 0.04496 mm’

GRID BOX: MaenificatioiK 20,000 GRIDID: "7^ Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 4/22/02

Analysis Performed By: 7 ROMAN PEYSAKHOV

GO. Structure Structure Type Length ID of Structure N or \ EDS i (Nonadb No C M >=05 u >=5p Chrys Amphibole Nonasb Ambig/ND Coord Elements) I <5u i

4^ G Zi

_J-------------------------- ~l__________ _____ L Struct = > O.pu > 3; I Aspect Ratio Grid acceptance:

Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped or folded Tjjtals laboratory identification criteria observed <10% particulate coverage >50% coverage ate

v= EDS spectrum conforming to laboratory least 20 unfolded or overlapped grid squares <5% / F I B C i M 1 >5p' holes or opaque areas L (dentification criteria obser/ed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous 1 C = Cluster i>3 Intersections) Anthophyllite 1 Non-Asbestos M = Matrix Tremolite i---------------- :____ L Actinolite i Non-Identified NSD = No Structures Detecteb

CONFIDENTIAL, CITY_21MC100_003471214 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000177025