GO Structure Structure Type Length ID of Structure N or EDS 1
No (Nonadb j
F B C M >=51J Chrys Amphibole Nonasb Ambtg/ND
No Coord <5u Elements) 1
-------- i
/ O'
a
Struct = > 0.5n >5:1 Aspect Ratio Grid acceptance:
'Z = Positive diffraction pattern properties conforming to <50% undissolved filter, overtapped 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 I >5u
EDS spectrum conforming to laboratory holes or opaque areas
identification criteria observed Chrysotile
AMPHIBOLES Amphibole
F = Single Fiber Amosite
0 = Bundle (<3 fibers <1 fiber diameter apart Crocidolite Ambiguous
C = Cluster (>3 Intersections) Anttiophyllite Non-Asbestos
Tremolite
M = Matrix' Non-Identified
Actinolite
NSD = No Structures Detected
CONFIDENTIAL, CITY_21MC100_003467478
SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008
NYC-WTC_000180755
OCR can misread numbers and units. Confirm readings against the page image before using them.
NYC-WTC_000180755Source: 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 2, 2002.