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r r r r r r r r r r r r r irr Table 7 Evaluation of Remedial Alternatives Stockton Service Center Alternative rmplementability TelcbniW Feasibility -co 1 Extraction/Air Implementable at the site,but would Effectively addresses the $50,000 to 5250,000 Stripping/Discharge require an area for the air stripper contaminants of concern May and piping. Existing wells can be require off-gas treatment Disposal converted to extraction and option would depend on regulatory reinjection wells Aquifer tests are approval and water quality required to determine well placement requirements. Proven technology and pump sizing, 2 Air SparginglVapor Requires establishing a vapor Effective in addressing contaminants, 5100,000 to 5500,000 I Extraction extraction system and associated but if formation is too tight,effective piping in addition to an air injection removal might be difficult well Pilot study required to determine whether effective air movement can be achieved 3 In Situ Btoremediatton $75,000 to$300,000 Active Implementable at site Would only Effectively addresses the require monitoring,microbial and contaminants of concern Platelet nutruient mput to groundwater,and and nutrient studies would be Input of oxygen Existing wells could required Regulatory approval would be used for injection of materials and be required Pilot testing may be for monitoring_ required Passive fmplementable at site Monitoring Effectiveness will depend on the 550,000 to $200,000 would be required presence of sufficient microbes Platelet and nutrient studies would be required Passive bioremediation would involve an extended remediation duration and extended monitorin& Ranges of costs are approximate and are based on estimalea volumes an uration o reme cation 93R22East Bay Municipal Utility District Stockton Svc Ctr -Site AssessmenURemedial Options 40429500 ase I