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'WbF-OMATRIX TABLE 5 CORRECTIVE ACTION ALTERNATIVES TO RESTORE GROUNDWATER TO WQOs 1805 Harbor Street Stockton, California Remedial Site-Specific Implementabdity Time to Alternative Technical Method Effectiveness at the Site Achieve WQOs Cost Natural Relies on the degradation of petroleum by naturally Good Easily Relatively long $140,100 Attenuation occurring microorganisms under ambient conditions Implementable (with attempted Petroleum is oxidized by microbial metabolic processes Already occurring at site free product Biodegradation byproducts are further oxidized to CO2 removal and a and H2O Uses electron acceptors in the following order human health 02,NO3, Fe+',SO4 risk evaluation) prior to implementation,active free product removal will be attempted using two extraction wells for a period of six months Costs for two years of quarterly monitoring, a human health risk assessment,a closure request, well destructions,and regulatory interaction are included Enhanced Involves adding 02 to the saturated zone via air infection Moderate to Poor Implementable I year to implement $2,351,500 in-situ Bio- to enhance in-situ aerobic biodegradation of petroleum and 10 years of remediation and biodegradation byproducts Btoventing;may be Deeper sandy soils are operation using Air added to further oxygenate the vadose zone(not to amenable to air injection SparginglSVE volatilize constituents} technologies Upper clayiying (cost estimate based BtosparSV soils are more difficult to on 10 years) Bioventing} An estimated minimum of 75,000 pounds of O2 would be remediate May ultimately required to oxidize the petroleum in the subsurface rely on natural attenuation Approximately 36 sparge probes and 10 biovent points would be installed in the affected zone,piped to an air compressor,and operated for up to 10 years I lboc_safek9WsW963rcAPlThi 5 Alts Thi nog Page I of 3