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' Feasibehty Study Report 1140 W Hammer Lane, Stockton, CA 6.1 Alternative 1 - Groundwater Extraction and Treatment ' This alternative involves remediation of groundwater by extraction and subsequent treatment of the groundwater prior to discharging the treated water into the City sanitary sewer system Initiation of ' this systems would include the following activities preparing plans and specifications, obtaining ' necessary permits, and installing the groundwater extraction wells and piping, treatment compound(s), and treatment device(s)(air stripper and/or granular activated carbon) The extraction system(s) would be monitored at least monthly or at the frequency specified by the appropriate permits Groundwater morutonng would continue on a regular basis until project completion A groundwater treatment ' system typically operates until the rate of contaminant removal reaches an asymptotic level, below which removal becomes technically and/or economically infeasible Continued groundwater ' monitoring would likely be required for a certain period after the system is shut down 6.2 Alternative 2 - Groundwater Extraction with Air Sparging/Soil Vapor Extraction This treatment alternative includes and enhances the method described as Alternative I A �. groundwater treatment system is enhanced by the addition of sparge points, which are designed to volatilize contaminants from the dissolved to the vapor phase, with subsequent treatment via catalytic or thermal oxidizer The treatment systern(s) would be monitored at Ieast monthly or at the frequency specified by the appropriate permits Groundwater monitoring would continue on a regular basis until project completion Similar to Alternative 1, active treatment would continue until removal of contaminants is technically and/or economically feasible, followed by continued groundwater monitoring 6.3 Alternative 3— Enhanced Natural Attenuation This alternative would involve minimal active remediation Naturally occurring microbes, which degrade petroleum hydrocarbon constituents over time, would be utilized and enhanced with the addition of ORC into the subsurface to promote a subsurface environment in which naturally occurring microbes will thrive The ORC material is a non-hazardous, food grade material consisting of a auxture of magnesium peroxide, magnesium oxide, and magnesium hydroxide After the reaction of magnesium hydroxide with water to form oxygen, the resulting material magnesium hydroxide is mildly basic The amounts of magnesium oxide (magnesia) and magnesium hydroxide in the initial product G 1DaWGROUNDMICNOWLES HAMIREPORTS\Fc=LbiiuyR,purt dna 10