GO. Structure Structure Type Length ID of Structure NorN EDS
No (Nonadb
F B C M >=05 p >=5p Ctirys Amphibole Nonasb Ambig/ND
No Coord <5p Elements)
Struct =•> 0.5g >5:1 Aspect Ratio Grid acceptance:
Positive diffraction pattern properties conforming to "50% undissoived niter, overlapped or folded Totals
laboratory identification criteria observed <10% particulate coverage >50% coverage ate
least 20 unfolded or overlapped grid squares <6% F B C M >5|J
V= EDS spectrum conforming to laboratory holes or opaque areas
identification criteria observed Chrysotile
AMPHIBOLES I Amphibole
F = Single Fiber Amosite
B = Bundle (<3 fibers <1 liber diameter apart Crocidolite Ambiguous
C = Cluster (>3 Intersections) I Anthophyllite Non-Asbestos
Tremolite
M = Matrix Non-Identified
Actinolite
NSD = No Structures Detected
CONFIDENTIAL, CITY_21MC100_0 03466954
SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008
NYC-WTC_000180402
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NYC-WTC_000180402Source: NYC Law Department, mirrored locally
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.