GO. Structure Structure Type Length ID of Structure N or \ . EDS
No (Nonadb
F B C M >=05 M... : '=5iJ Chrys Amphibole Nonasb Ambig/ND
No Coord <5|J Elements)
23
Struct = > 0.5p > 5:1 Aspect Ratio Grid acceptance:
<= Positive diffracfion pattern properties oonfonning to "50% undissolved filter, overlap^ or folded Totals
laboratory identification crteria observed - <10% parboulate coverage >50% coverage ate
least 20 unfolded or overlapped grid squares <5% F B C M >5p
EDS spectrum conforming to laboratory holes or opaque areas
identification criteria observed Chrysotile
5 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 Actinolite Non-Identified
NSD = No Structures Detected
CONFIDENTIAL, CITY_21MC100_003470387
SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008
NYC-WTC_000176476
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NYC-WTC_000176476Source: NYC Law Department, mirrored locally
Laboratory report documenting transmission electron microscopy analysis of an air filter sample collected from a New York City Board of Education site.