GO. Structure Structure Type Length ID of Structure IN or v EDS
No F B C M >=05'y :>=5|j Amphibole , (Nonadb
.No' Coord Chrys Nonasb Ambig/ND
Elements)
<5m
Struct = > 0.5u > 5:1 Aspect Ratio Grid acceptance:
v'= Positive diffraction pattern properties conforming to <50% undissolyed 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
'/= 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
Actinolite Non-Identified
NSD = No Structures Detected
CONFIDENTIAL, CITY_21MC100_002723175
SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008
NYC-WTC_000230396
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NYC-WTC_000230396Source: 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.