TABLE B-3 Average Concentration (mg/m3) of the 12 Most Frequently Detected VOCs 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||15||8||19||12||9||18||15||7||19|
guard tower/transportation field, H-6 housing/CASF, and mortar pit locations, respectively, on 19 sampling days, with 3 different days missing a sample at one location (TO-9 method; 54 samples total). The concentrations measured in May and June of 2009 were consistently lower for all congeners, and at all measurement locations, than those measured in January, February, April, October, and November 2007, with a larger proportion of nondetects than in 2007 (206/918, 22%, versus 126/1173, 11%). Again, 1,2,3,7,8,9-hexaCDF was the most frequent nondetect (only 4/54 samples measurable).
CHPPM also provided the committee with PCDD/PCDF sample data for 9 samples collected on 9 dates in 2006, but no location for these samples was given. At JBB, the distributions of concentrations of total PCDD/Fs (the sum of the seventeen 2,3,7,8-chlorinated congener concentrations) and individual congeners at each location are approximately lognormal with high correlations between congeners. In the 2007 measurements, there is no significant difference in individual congeners or in total PCDD/F between the January–April and October–November measurements at each location, although there is a slight trend for the January–April concentrations to be higher than the October–November concentrations at the guard tower/transportation field and H-6 housing/CASF locations.
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