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6.0 Remedial Action Alternatives ' The following section presents descriptions and evaluations of potential remedial action alternatives for the impacted groundwater at the Stockton Service ' Center To address a broad range of potential options, the following approach has been taken The alternatives are first divided into broad categories which are further ' broken down into specific technologies The technologies are then subjected to a screening evaluation This evaluation narrows the field of potential options to those applicable and cost effective The remaining technologies are developed into ' potential remedial alternatives to address site-specific conditions These alternatives are evaluated on implementability, technical feasibility, and cost to determine the ' most feasible option for the site A remedial action plan for the selected option would be required for approval by the responsible regulatory agencies ' 6.1 Groundwater Remedial Action Alternatives The groundwater remedial action alternatives can be divided into two broad categories, extraction/treatment and in situ treatment Extraction/treatment (pump- and-treat) requires recovery of the contaminated groundwater and physical/chemical, biological, or thermal treatment to levels acceptable for discharge or reinfection In situ treatment uses physical/chemical or biological processes to treat the groundwater in place Both of these broad categories may be applicable to the groundwater at the Stockton Service Center The various technologies required to extract, treat, and ' discharge the groundwater are described and evaluated in the following sections 61.1 Extraction ' Extraction of the groundwater is most effectively accomplished by installing groundwater recovery wells near the leading edge of the contaminant plume to ' control spread and near the center of the plume for mass removal Because the plume at the Stockton Service Center is relatively small and the concentrations are ' relatively low, a single well near the center of the plume may have a sufficient to capture zone to influence the leading edge as well Aquifer tests such as pump tests and slug tests would be required to determine the yield and other aquifer characteristics necessary to properly design the recovery well and pump The well would be designed so that the radius of influence captures the contaminant plume Extraction of groundwater has been used with varying degrees of success at other 93822 East Bay Municipal Utility District ' 40429500 asa 13 Stockton Svc Or -Site Assessment/Remedial Options