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Disposal of the water could be accomplished by discharging to a wastewater treatment facility or to a storm drainage system The groundwater quality would have ' to meet the limits imposed by the facility owner for discharge to a wastewater treatment facility or meet the requirements established by the National Pollutant Discharge Elimination System (NPDES) for discharge to the storm drainage system The Stockton Service Center is not directly served by a storm drain so discharge to the storm drainage system may not be readily implementable 6.2 Potential Remedial Alternatives ' Based on the analysis of the available technologies, air stripping, air sparging, and in situ bioremediation, appear to be most applicable to the site These ' technologies have been developed into the following three remedial alternatives and are discussed in detail as follows An evaluation of these alternatives is presented on ' Table 7 6.2.1 Alternative 1 Extraction/Air StrippmglDischarge ' A groundwater extraction well would be installed to remove contaminated groundwater from the aquifer MW-1 and MW-8 could be used as extraction wells Because MW-1 is a 2-inch diameter well, it would have to be destroyed and replaced by a larger well to be used as an extraction well Alternatively, a new well could be installed near MW-1 to serve as an extraction well The size of the plume appears to be small enough to be addressed by one extraction well, but aquifer tests would be required to confirm this and to properly design the well and pump Once the ' groundwater is pumped from the formation, the water would be passed through an onsite air stripper The air stripper would be equipped with and off-gas system to control emissions The treated groundwater would then be reinfected to the aquifer through an infection well MW-1 or MW-8, the well that is not used for extraction, could be used as the infection well This well may require reconfiguration to provide for efficient injection If reinfection is not consistent with regulatory requirements, then an alternative disposal method would be required, such as discharge to a storm ' drain if the residual Ievels are in accordance with the NPDES requirements, or to a local treatment facility if the residual levels are in accordance with facility ' requirements Discharge to the storm drainage system does not appear to be readily implementable at this site Monitoring wells within the plume boundaries would be required to provide effective monitoring of the remediation Treatment using air ' 93R22 East Bay Municipal Utility District 40429500 asa 17 Stockton Svc Ctr Site Assessment/RemedLal Options 1