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�t7j ; Qi 1011 <br /> 3 <br /> i 4 <br /> unsaturated soil with high concentrations of highly volatile <br /> contaminants. It has very limited application to remediation in <br /> the saturated zone. <br /> r <br /> BecauBe gasoline concentrations are relatively low at the Lodi <br /> P site and the contaminants are generally limited to the saturated <br /> zone, the interface with the vadose zone, and the soils under the <br /> FA <br /> tank pit, soil venting does.not appear to be the method of choice <br /> for a rapid and thorough remediation of the Lodi site. <br /> {a SlonfiGg ATIf]N <br /> Natural biodegradation allows indigenous microbes to � <br /> metabolically degrade the contaminant. This occurs if there are. i <br /> sufficient nutrients present, especially oxygen, nitrogen, and <br /> phosphorus. In fact, the lack of nitrogen and phosphorous in the <br /> groandwater on the Lodi site may indicate that some microbial <br /> degradation had beenoccurring, but stopped due to nutrient <br /> � til <br /> limitations. When biodegradation is allowed to occur at natural <br /> } <br /> x' rates, it is slow and nutrient limited. <br /> � t <br /> *. 1"ITU B1OHMr2IATION <br /> t In_Rj,t,B bioremediation was developed by the petroleum industry � - <br /> ,.r '< almost 15 years ago to clean up plant site spills and <br /> ,� - ' <. - '�contamiriation.T Since then it-.has been applied- exten®ively-to � - <br /> '� .; gasoline spills at other locations, primarily by Raymond et al. . <br /> � <br /> r (1-�4) . The basis. for this technology is that microorganisms, � <br /> 4�7 <br /> =z _ Ll <br /> Fx , primarily bacteria,_ are present in all soils and water. Because <br /> these microbes have been exposed to tho contaminants since they <br /> f 22 . <br /> F - - <br /> u <br />