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stripping has been effective in other locations in meeting these discharge <br /> requirements <br /> ' 6.2.2 Alternative 2 Air SparginglVapor Extraction <br /> An air sparging and vapor extraction system would be installed at the Stockton <br /> ' Service Center to accomplish this alternative The treatment system would consist <br /> of air injection wells,vapor extraction wells, an oil-free air compressor, an air delivery <br /> ' piping system, a vapor extraction piping system, and an off-gas treatment system To <br /> facilitate use of the Stockton Service Center during remediation, the piping systems <br /> ' would be placed underground and designed to allow for heavy vehicle loading To <br /> determine the effectiveness of the remediation, a set of monitoring wells near the <br /> perimeter of the plume would be required Biodegradation of the contaminants <br /> ' would be enhanced by aerating the groundwater <br /> Although air sparging is readily applicable to petroleum hydrocarbon <br /> ' contaminated groundwater, it is most effective at sites with coarse grained aquifer <br /> material The saturated zone material at the Stockton Service Center is relatively <br /> fine grained To determine whether air sparging applicable for this site, a pilot test <br /> would be required <br /> 6.2.3 Alternative 3 In Situ Bioremediation <br /> An active in situ bioremediation system would require injection of microbes, <br /> ' nutrients, and an oxygen source into the aquifer This could be accomplished at the <br /> Stockton Service Center by using MW-8 which appears to be near the center of the <br /> ' plume Platelet and nutrient studies would be required to determine the microbial <br /> and nutrient requirements to produce effective remediation MW-1 could be used <br /> as monitoring well to determine the effectiveness of the remediation The system <br /> rmay also require extraction to minimize the potential for spreading the plume <br /> Hydrogen peroxide may be added in low concentrations to provide oxygen and <br /> ' reduce bacterial clogging near the injection point <br /> A passive bioremediation system would only require monitoring provided <br /> ' sufficient microbial populations are present to degrade the contaminants Monitoring <br /> could be performed in MW-1 and MW-8 to determine the extent and effectiveness <br /> of remediation Platelet and nutrient studies would be required to determine if this <br /> ' treatment scenario is feasible <br /> 93822 East Bay Municipal Utility District <br /> 40429500 aca 18 Stockton Svc Ctr -site Assessment/Remedial Options <br />