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NYC-WTC_000229897

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NYC 9/11 Public Portal Document

TEM Asbestos (air) Count Sheet Client Name: NYC BOE Volume flitersi: 1808 Lab Group #: 8002 Filter Type / Filter Area; MCE 385 Lab Sample #: 12 Grid Opening Size: 0.01124 Client Sample #: 14 Area Examined: 0.04496 GRID BOX: Magnification: 20,000 GRID ID: Accelerating Voltage: 100 KeV # Grid Openings: 4 Analysis Date: 6/8/02

Analysis Performed By: MARKPEYSAKHOV

GO. Structure Structure Type Length ID of structure N or 7 EDS No Nonasb (Nonadb F B C M >=05 M >=5p Chrys Amphibole AmbigflID No Coord <5m Elements)

~—t—

Struct = > 0.5p > 5:1 Aspect Ratio Grid acceptance: 7= Positive diffraction pattern properties conforming to <50% undissolved filter, overiapped 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 >5p 7= 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 NSO = No Structures Detected

CONFIDENTIAL, CITY_21MC100_003388457 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000229897

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NYC-WTC_000229897Source: NYC Law Department, mirrored locally

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NYC-WTC_000176533

Document recording laboratory analysis results for a transmission electron microscopy asbestos air sample collected from a New York City Board of Education site.

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