NYC 9/11 Public Portal Document
THICK WTC FALLOUT DUST DEPOSITS OUTDOORS weight percent (%)
(all asbestos included, not
MANHATTAN
just PCM-equivalent
Includes all asbestos, not just fibers longer than 5 micrometers
asbestos)
Ground Zero Task Force Study,*'' data from Table 22. Analyses by gravimetric matrix reduction
(American Society for Testing and Materials ASTM STP 1342) followed by PLM analyses of larger
fractions and TEM measurement of fine portion of samples
Roof of automobile, Church St. south of Duane St. 0.67 %
45 Warren St., roof, outside Sth floor loft, gaps in stone floor 1.05 %
250 South End Ave,, Apartment 11D, exterior window ledge 2.25%
250 South End Ave., ground level courtyard, top of wall 2.05 %
HP Environmental Study, Table 5.*’ PLM analyses.
#1 - Barkley St west of Church < 0.25 %
#2 - Barkley St between Broadway and Church ND
#3 - Barkely and Greenwich ND
#4 - Barkey between Greenwich and Joe Dimaggio Hwy ND
#5 -Barkely at Joe Dimaggio Hwy 0.5 %
#6 - Warren and Church <0.25 %
#7 - Murray near Broadway 0.75%
#8 - Murray and Greenwich ND
#9 - Chambers between Broadway and Greenwich ND
#10 - Murray between Greenwich and Joe Dimaggio 0.75 %
#11 - Warren between Greenwich and Joe Dimaggio 0.75 %
EPA data on bulk dusts taken outside buildings in Manhattan.*’ All the analyses performed EPA for
Manhattan used the less sensitive PLM method. EPA did not fraction the sample and use electron
microscopy techniques in addition to PLM as did the Ground Zero Task Force study above. EPA in its
risk assessment for Libby, however, noted that soil samples showing non-detectable asbestos by PLM
alone actually had high levels when analyzed by scanning electron microscope (SEM) methods.**
48 of 177 dust samples 1 -4.46%
129 dust samples ND
-17-
NYC-WTC_000140251
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