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1 <br /> TABLE 9 <br />' POTENTIAL REMEDIAL ALTERNATIVES <br /> Knowles Property <br /> 1140 W. Hammer Lane, Stockton, CA <br />' Method Estimated I Estimated Comments <br /> Duration-L-- Cost <br /> Soil Remediation <br />' The deep soil between 30-50 feet is now saturated Current depth t <br /> Deep Excavation Several $300,000- water is 30 feet Clam shell excavator is expensive and requires <br /> Months $400,000+ special permitting Would require extensive shoring Technically <br /> and economically infeasible <br /> Soil Vapor $300,000- Affected soil now saturated Would require dewatering, which would <br /> Extraction 22? Years $400,000+ add significantly to the cost Technically and economically <br /> infeasible <br />' Natural Attenuation Unknown $15,000- Generally takes many years Estimated costs are for confirmation <br /> $30,000 bona s <br /> Groundwater Remediation <br />' Very inefficient process, requires high energy consumption, <br /> disruptive to site with installation of treatment system, technically <br /> Groundwater Pump 2-7 years $300,000- difficult to remove all contaminated groundwater due to adherence <br /> and Treat $500,000+ to soil particles Would necessarily be followed by groundwater <br /> monitoring ($4,000-$8,000 per year) for an undetermined number of <br /> ears <br /> • Same as above Sparging can theoretically help to drive <br /> Groundwater Pump contaminations from groundwater into vapor phase where vapors <br /> and Treat with Air 22? years $300,000- are extracted and destroyed Vapor extraction aspect may be <br /> Sparging $500,000+ infeasible due to fine-grained sods Would necessarily be followed <br /> by groundwater monitoring ($4,000-$8,000 per year) for an <br /> undetermined number of years <br /> Passive ORC Designed to enhance natural bioremediation Will not likely <br /> added to 3-5 years $50,000- remediate entire plume Somewhat unproven technology Would <br /> monitoring wells $70,000 necessarily be followed by groundwater monitoring ($4,000-$8,000 <br /> per year) for an undetermined number of years <br />' Active ORC Designed to enhance natural bioremediation Would involve drilling <br /> infected through 1-2 years $30,000- more soil borings on site Somewhat unproven technology Would <br /> soil borings $50,000 necessarily be followed by groundwater monitoring ($4,000-$8,000 <br /> per year) for an undetermined number of years <br /> Monitored Natural $4,000 <br /> Attenuation Unknown $8,000 per Passive remediation approach Requires long term monitoring <br /> ear <br />