39 shared non-person entities · 1 shared topics · similarity 0.982
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EPA interim final report on WTC background study, April 2003
Machine-extracted title · confidence 100%Interim final report from EPA Region 2 detailing a background study of environmental conditions at the World Trade Center site.
NYC-WTC_000145869–000146029Folder label: “INTERIM FINAL April 2003”
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NYC 9/11 Public Portal Document
The estimated background concentrations that were calculated were compared to literature values when available. Values reported in the literature regarding asbestos and MMVF in air, and lead and dioxin in settled dust from urban environments, that were collected and analyzed using methods similar to this Study, are consistent to the values generated by the samples collected in this background Study (Table 8-2). The consistent nature indicates that the concentrations observed from this Study population are similar to other urban environments.
The literature search conducted as part of this evaluation highlighted data gaps in the scientific literature for several of the compounds for which data were collected. These compounds include MMVF, crystalline silica, calcite, gypsum, and portlandite. The data collected and the calculated background concentrations provide a source of data that can be used to address these data gaps.
In general, the data sets for samples that were collected in residential areas and common areas were similar, however there were data sets in which the detected concentrations in common area were nominally higher than the residential spaces. The activity pattern, amount of foot traffic, type of cleaning, and frequency of cleaning may differ between these spaces, and some combination of these factors may be responsible for this observation.
Table 8-2. Comparison of estimated background values from this study to background or historical values reported in the scientific literature for select compounds. Compound Estimated Background Historical/Literature UCL Value Value Asbestos - PCMe 0. 24 s/cc 0.00022 s/cc^’)
MMVF - air 0.00006 s/cc ^0.0001 Lead - air 0.03 pg/m’ 0.02 pg/m^(3^ Lead - wipe floors 3.91 pg/tf 3.45 pg/ft^^
Dioxin - wipe 0.693 ng/m^ 0.67 ng/m^5) Consinner Product Safety Commission Study. 1987. ® ATSDR. 2002. Calculated value from EPA historic ambient air lead data. 2001. Christmaim. 1989.
WORLD TRADE CENTER BACKGROUND STUDY 40
NYC-WTC_000145915
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