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TEM Asbestos air sample results, NYC BOE, Apr 2002

Machine-extracted title · confidence 95%

Laboratory data sheet recording transmission electron microscopy analysis of an air sample collected from the NYC Board of Education on April 13, 2002.

NYC-WTC_000178899
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NYC 9/11 Public Portal Document

TEWI Asbestos (air) Coamt Sheeit Client Name: NYC BOE Volume (liters): 1920 7392 Filter Type / Filter .Area: MCE 385 mm^ Lab Group #: Grid Opening Size: 0.0il24 Lab Sample £ 9 Area Examined: 0.0449e Client Sample ft: 11 Magnification: 20,000 GRID BOX: GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Pate: 4/13/02

La .Analysis Performed By: MARK PEYSAKHOV

Structure Slructure Type Length ID Of Structure .\j or 'I EOS GO. (Nonadb No F B C M >=5lJ Clirys Amphibole Nonasb ArabigJNO Elements) : No ' Coord <5m ■“~T :■

Struct = > O.Sp .> 5; 1 Aspect Ratio Grid acceptance: 'I- Positive diffraction pattern properties conforming to *50% undissolved filter, overlapped or folded Totals laboratory identificaSon criteria absented 'rl0% paniculate coverage >50% coverage ale least 20 unfolded or overlapped grid squares <5% F B C M >5p ■/= EDS spectrum conforming to laboraloiy holes or opaque areas identificatioii criteria obsen/ed Chrysotile AMPHIBOLES Amphibole F = Single Fiber Amosite B = Bundle (<3 fibeis <1 fiber diameter apart Crocidolite Ambiguous C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos T remolite M = Matrix Actinolite Non-Identified NSD = No Structures.Oeiected

CONFIDENTIAL, CITY_21MC100_009505416

SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000178899

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NYC-WTC_000178899Source: NYC Law Department, mirrored locally

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TEM Asbestos air sample results, NYC BOE, Feb 2002

NYC-WTC_000180865

Laboratory report documenting transmission electron microscopy analysis of an air sample collected from a New York City Board of Education site on February 1, 2002.

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