GO. Structure Structure Type Length ID of Structure N or 7 EDS
No (Nonadb
F B C M >=05 p— >=5p Chrys Amphibole Nonasb Ambig/ND
No i . Coord <5p Elements)
''
A
Struct = > 0.5)u >5:1 Aspect Ratio Grid acceptance:
y = 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 >5m
•/= 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-Identitled
Actinolite
NSD = No Structures Detected
CONFIDENTIAL, CITY_21MC1OO_OO347O479
SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008
NYC-WTC_000176530
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NYC-WTC_000176530Source: 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.