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for contact of the water and air The contaminants are transferred from the water to the air The air exits near the top of the tower and is typically passed through a ' secondary system to control air emissions Air stripping has been used successfully to remediate groundwater contaminated with petroleum hydrocarbons An evaluation of air stripping is presented on Table 5 In situ volatilization is typically performed by air sparging In air sparging, air ' is injected into the groundwater through an air injection well The air bubbles through the groundwater up to the vadose zone where it is collected by vapor extraction wells The contaminated vapor stream is piped to the surface and passed ' through an air emissions control system Biodegradation of contaminants by naturally occurring bacteria is stimulated by the addition of oxygen to the groundwater Air sparging requires installation of both air injection wells and a vapor extraction system Air sparging is a fairly new technology in the United States, but it has been demonstrated to be successful for remediation of petroleum hydrocarbon ' contaminated groundwater at sites with coarse aquifer materials Pilot studies would be required to determine injection rates, pressures, radii of influence, and whether ' effective aeration of the groundwater through air sparging can be achieved at this site An evaluation of air sparging is presented on Table 6 6.1.3 Discharge After extraction and treatment,the groundwater must be discharged Discharge of groundwater can be accomplished by reinjection, reuse, or disposal The discharge method may govern the extent of treatment required because the acceptable levels ' of residuals may vary with discharge methods Reinjection of the groundwater would require the installation of a reinjection well This well would be coordinated with the ' placement of the extraction well and would assist in the hydraulic control of the contaminant plume Reinjection would be readily implementable at the site, ' however, it is subject to regulatory approval Reuse of the treated groundwater may be accomplished by using the water for non-potable uses such as irrigation or fire fighting, provided acceptable levels are ' achieved by the treatment system Because the groundwater would be extracted continuously, a point of continuous reuse is preferred This would require ' identification of potential users in the vicinity of the site Reuse would generally require some type of storage if a continuous dependable reuse source is not identified The logistics and management aspects of reuse do not make it a practical alternative at this site ' 931222 East Bay Municipal Utility District 40429500 aca 16 Stockton Svc Ctr -Site Assessment/Remedial Options