TABLE B-1 Average PAH Concentrations (ng/m3) at JBB
|Analyte||Guard Tower/ Transportation Field||H-6 Housing/CASF||Mortar Pit|
|Spring 2007||Fall 2007||2009||Spring 2007||Fall 2007||2009||Spring 2007||Fall 2007||2009|
|Number of samples||9||10||19||11||7||17||10||6||18|
Polycyclic Aromatic Hydrocarbons
Measurements of PAHs were obtained at five sampling sites at JBB, but for 2007 these were reported as three locations—the guard tower/transportation field (20 samples),1 H-6 housing/CASF (18 samples) and mortar pit (16 samples) (Table B-1). In 2007, samples were collected on each of 22 days, but on only 12 days were all three locations sampled. The 2009 measurements were again taken at the five sampling sites, and were reported separately for the five sites; but they are treated here as the three sampling locations as was done for the 2007 samples—the guard tower/transportation field (19 samples), H-6 housing/CASF (17 samples) and mortar pit (18 samples). Some samples were collected on each of 20 days, but only on 15 days were all three locations sampled. The nominally 24-h samples were not obtained simultaneously at the three locations on the common sampling days, but began within 2.5 hours in 2007, and within 1.6 hours in 2009; the sample times varied from 17.4 hours to 25.4 hours in 2007, and 21.1 hours to 25.2 hours in 2009. In both 2007 and 2009 each sample was analyzed for 17 PAH analytes, with all of the analytes detected in most samples.2
1Twenty-one samples results are reported in the data provided to the committee and used by Taylor et al. (2008), but one clearly corresponds to an unexposed sample and is omitted from further consideration here.
2The omitted sample was nondetect for every PAH except naphthalene, which was measured at a level 50 times lower than the next lowest sample. The committee considers this to be an unexposed sample.