TABLE B-2 Number of Detects and Likely Source for Analytes Detected More than Occasionally in 2007 and 2009

Analyte Number of detectsa Likely major source or use
2007 2009
Acetone 66 55 Solvent, combustion
Benzene 66 56 Combustion
Chloromethane 66 54 Natural sources (ATSDR 1998, 1999)
Toluene 63 56 Petroleum-based fuel combustion
Hexane 65 53 Petroleum-based fuel combustion
Pentane 65 NA Petroleum-based fuel combustion
Dichlorodifluoromethane 64 55 Refrigerant
Propylene 32 55 Petroleum-based fuel combustion
2-Butanone (MEK) 20 53 Solvent, combustion
Methylene chloride 27 52 Solvent
o-Xylene 51 52 Combustion
n-Heptane 60 36 Petroleum-based fuel combustion
Ethylbenzene 49 49 Combustion
m,p-Xylene 55 NA Combustion
Xylenes, total NA 45 Combustion
1,2,4-Trimethylbenzene 51 41 Combustion
Octane 46 NA Petroleum-based fuel combustion
Trichlorofluoromethane 42 37 Refrigerant
Chlorodifluoromethane 41 NA Refrigerant
Acrolein 4 34 Combustion
4-Ethyltoluene 38 12/30 Combustion
Isopropyl alcohol NA 27 Solvent, disinfectant
Methyl tert-butyl ether (MtBE) 29 0 Anti-knock fuel additive
1,3,5-Trimethylbenzene 24 11 Combustion
Isooctane 17 NA Anti-knock fuel additive
Styrene 17 14 Combustion
1,4-Dichlorobenzene 4 9 Mothballs, pesticide
Cyclohexane NA 8 Petroleum-based fuel combustion

NOTE: NA = not analyzed.
aTotal possible detects 66 in 2007 and 57 in 2009 except 4-ethyltoluene.

for many analytes at all the measurement locations at JBB, and there did not appear to be any consistent gradients in concentration, although differing gradients exist for some analytes at some times.

Polychlorinated Dibenzo-Para-Dioxins/Furans

During 2007, 18, 21, and 21 PCDD/F nominal 24-hour samples were collected at the guard tower/transportation field, H-6 housing/CASF, and mortar pit locations, respectively, on 20 sampling days (TO-9 method; 60 samples total). Two of the samples for the H-6 housing/CASF and mortar pit locations were obtained on the same day (about 2 hours and 20 minutes apart in starting time, respectively), and on 2 of the 20 sampling days the guard tower/transportation field was not sampled. All samples were analyzed for the seventeen 2,3,7,8-chlorinated PCDD/F congeners, with all congeners detectable in 41 or more of the 60 samples except 1,2,3,7,8,9-hexaCDF (detected in 14/60 samples).

The 2009 sampling data for PCDD/PCDFs included 19, 17, and 18 PCDD/F nominal 24-hour samples at the



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