GO. Structure Structure Type Length ID of Structure N or EDS
No (Nonadb
F B C M >=05 M :>=5m Chrys Amphibole Nonasb Ambig/ND
loord <5m Elements)
E22
-IL—
G...
-4—
Struct = > 0.5n >5:1 Aspect Ratio Grid acceptance:
Positive diffraction pattern properties conforming to <50% undissohred filter, overlapped or folded Totals
laboratory identification criteria observed <10% particulate coverage >50% coverage ate
least 20 unfolded or overtapped grid squares <5% F B C M >5m
EDS spectrum conforming to laboratory holes or opaque areas
identification criteria observed Chrysotile
i AMPHIBOLES Amphibole
F = Single Fiber i Amosite
B = Bundle (<3 fibers <1 fiber diameter apart ! Crocidolite Ambiguous
C = Cluster (>3 Intersections) I Anthophyllite Non-Asbestos
I Tremolite
M = Matrix Non-ldentified
Actinolite
NSD = No Structures Detected
CONFIDENTIAL, CITY_21MC100_0 03470669
SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008
NYC-WTC_000176652
OCR can misread numbers and units. Confirm readings against the page image before using them.
NYC-WTC_000176652Source: NYC Law Department, mirrored locally
Laboratory report documenting transmission electron microscopy analysis of air samples collected from NYC Board of Education facilities on February 4, 2002.