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�Graundwater <br /> Flow Dlrectfon <br /> Y9 3J \ <br /> x.ia .a3a\ \ r f <br /> 3 .HW� •)dA 537 cz Jag 14,96 � Z� <br /> 0330 �.\`�_ _ 3.3\\ .bM ��_ 44K/ <br /> Se -F <br /> 1.74 <br /> I i <br /> iie WE wCO ENMA <br /> .-3.J— UMC EB LMF FCC CEMMIKMI, 9A) <br /> IMDMEK INFEMM <br /> COMpP MIERJPL-VPRNeIf ' <br /> .._. sFigure-+- Methaneiry oundwater, Patrick AFB,.:Florida:. . _._. <br /> Many of the water samples with depleted fore, the shallow ground water had an as- <br /> dissolved oxygen did contain small similation capacity of 1200 pg/L total BTEX <br /> amounts of dissolved hydrogen sulfide. The (Table 5). <br /> water chemistry suggested that dissolved <br /> BTEX would be subjected primarily to Ferrous iron distribution (Figure 3) in the <br /> aerobic respiration, iron reduction and site ground water showed a direct relation- <br /> methanogenesis. ship with elevated total BTEX. Background <br /> of ferrous iron was near 0.1 mg/L while <br /> The distribution of dissolved oxygen is levels up to 1.9 mg/L were present in the <br /> shown in Figure 2. Site areas with depleted plume. Based on the Table 1 stoichiometry, <br /> dissolved oxygen coincided with areas of the iron reduction would have the capacity <br /> elevated BTEX, which indicated that aero- to assimilate at least 90 pg/L of the total <br /> bic biodegradation was occurring. Back- BTEX. Replenishment of the ferrous iron <br /> ground dissolved oxygen was 3.7 mg/L. from soil iron oxides could occur to in- <br /> Based on the Table 1 stoichiometry, there- <br /> pound Point B Biodegradation Point C i Biodegradation <br /> Corrected pg/L A to B% Corrected gg/L B to C% t <br /> Benzene 25710 0 9 99 „ <br /> Toluene 455 38 19 0 <br /> Ethylbenzene 321 61 19 0 <br /> _ Xylenes 3214 36 139 0 <br /> Trimethylbenzene 750 0 28 0 <br /> Table-4.-Percent loss using TMB-corrected concentrations. <br /> 6 Proceedings of the 10th Annual Conference on Hazardous Waste Research <br />