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Groundwater _ <br /> \ Flow Direction EMW sal CONwMrwiaru <br /> \ h ND <br /> t to ff <br /> t ha <br /> 197 <br /> (�I« -6 .< I Q <br /> � Is • • $D0.7 <br /> �N tJ <br /> •� — <J _eD <br /> CONIAMNA1ClN <br /> ND <br /> Tm NIX CO EM nm <br /> ME Em L1D[4El OMCEN@AtgN %q 1 <br /> IDVA£D"M NRMED1 n <br /> CCNWW mw -VN <br /> Figure 1 otal'BTEX in ground water,Patrick AFB,Florida. <br /> duction in total contaminant mass in ground tification of biodegradation of BTEX—which <br /> water are aerobic respiration, denitrification, are major fuel constituents—is very impor- <br /> iron or manganese reduction, sulfate re- tant. Patterns and rates can vary from site <br /> duction and methanogenesis (Table 1). to site. The loss of contaminants downgra- <br /> These processes, called intrinsic bioreme- dient to our site was used as evidence for <br /> diation, are important contributors to ben- the occurrence of intrinsic bioremediation. <br /> zene, toluene, ethylbenzene and xylenes <br /> (BTEX) removal from ground water. SPILL SITE <br /> If oily phase residue is present in the sub- About 700 gallons of unleaded gasoline <br /> surface, it can act as a continuing source of were released into the subsurface in 1986 <br /> contamination. To demonstrate intrinsic at an on-base service station location. The <br /> bioremediation at field spill sites, the quan- subsurface matrix consisted of beach sand <br /> -- Compound Point A Point B Point C <br /> Benzene 724 960 1 <br /> Toluene 737 17 2 <br /> Ethylbenzene 823 12 1 <br /> Xylenes 5020 120 15 <br /> Trimethylbenzene 750 28 3 <br /> Total BTEX+TMB 8054 1137 23 t <br /> c <br /> _ Measured methane 14000 8800 2140 <br /> Methane produced from BTEX&TMB 6282 887 18 <br /> Tablet: BTEX concentrations, gg/L. <br /> Proceedings of the 10th Annual Conference on Hazardous Waste Research 3 <br />