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Mir M M M M M � � M M Mir M <br /> Table 6 <br /> In Situ Groundwater Treatment Technologies <br /> Stockton Service Center <br /> Cor€tat���aats <br /> Relative <br /> Technology Process Description Treated Advaii � �3isadvaiitages Cost <br /> Active Bioremcdiation Nutrients and bacteria are Most effective on Will expedite cleanup of Requires soils with Low to <br /> supplied to the groundwater to biodegradable organics dissolved phase contaminants high permeabdities. Moderate <br /> enhance biological breakdown Byproducts are non- Ability of the sods to <br /> of contaminants hazardous support microbial <br /> population is a factor <br /> Air Spargingl Air stream is introduced into Most effective on Cleanup of dissolved phase Soil venting system is Low to <br /> Vapor Extraction the water table to induct volatile organic contaminants and possible required <br /> treatment <br /> and possibly <br /> Moderate <br /> volatilisation of the compounds absorbed phases g� <br /> contaminants <br /> Passive Bioremediation Contaminants are left alone Most effective on low cost Very long remediation very Low <br /> Natural biodegradation and biodegradable organics times Possible <br /> ob <br /> attenuation occur problems m obtaining <br /> regulatory approval <br /> Oxidation hydrogen peroxide is supplied Most effective with low Will expedite cleanup of May require catalysts. Low to <br /> to the groundwater to oxidize concentrations of dissolved phase contaminants May cause Moderate <br /> the contaminants. alkenes and aromatics volatilization of <br /> contaminants into <br /> vadose zone May <br /> cause spreading of <br /> plume <br /> East Bay Municipal Utility District <br /> 931122 <br /> Stockton Svc Gtr -Site AssessmentlRemcdial Options <br /> 40429500 asa <br />