GO. Structure Structure Type Length ID of Structure Notn EDS
No >=05 u Amphibole (Nonadb
F B C M >=5|J Chrys Nonasb Ambig/ND
No . Coord <5|J Elemehts)
Struct = > 0.5g > 5:1 Aspect Ratio Grid acceptance;
Positive diffraction pattern properties conforming to <50% undissolved filter, overlapped 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
v= EDS spectrum conforming to laboratory . holes or opaque areas
identification criteria observed Chrysotile
AMPHIBOLES~^i Amphibole
F = Single Fiber Amosite I
B = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous
C = Cluster (>3 Intersections) Anthophyllite Non-Asbestos
Tremolite
M = Matrix Non-Identified
Actinolite
NSD = No Structures Delected
CONFIDENTIAL, CITY_21MC100_0 03433665
SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008
NYC-WTC_000175881
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NYC-WTC_000175881Source: 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.