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TABLE 9 <br /> SOIL CORRECTIVE ACTION ALTERNATIVES <br /> Former Fisco Warehouse <br /> 1648 Shaw Road, Stockton, California <br /> Estimated Costs(incl Typical Monitonng Estimated <br /> Method Advantages Disadvantages Monitoring and Requirements Duration <br /> Mamtenance <br /> In-situ Soil Vapor •Easily combined with other Greater than 90%reduction of contaminants $85,000 to$100,000 for Weekly and monthly 12 to 18 months <br /> Extraction methods(i e IAS)•Readily generally not attainable•Large initial 18 months vapor sampling,semi- <br /> available equipment•Conducive site equipment cost•Supplemental fuel required annual or annual soil <br /> Section 9 I conditions•Relatively rapid cleanup and costs can be excessive as contaminants sampling <br /> period(10 to 36 months)•Can decrease•Air permitting required•Only <br /> cleanup contaminated soil under non-saturated soils cleaned up <br /> structures/roads <br /> Excavation •Theoretical removal of 100%of •Cost-effectiveness decreases with depth of $175,000 to$200,000 Monitoring of 1 month for <br /> contaminants•Relatively short contamination•Cannot cleanup under for excavation,disposal excavated soil, excavation and <br /> Section 9 2 remediation period•Effective structures•Excavated soil must be treated or and backfill-does not collection of soil disposal,6 to 12 <br /> remediation of all soil types disposed•Backfill material and compaction include disruption to samples upon months if soil <br /> costs can be excessive•Disruption of day to business or building completion of treatment is <br /> day business,unacceptable to client and demolition/repair excavation required <br /> tenant <br /> Natural •Lower costs than most active •Not effective for higher contaminant $10,000 to$20,000 Installation of unknown <br /> Attenuation/Passive remedial alternatives•Minimal concentrations•Migration of contamination annually-could be additional borings, <br /> emediation disturbance to the site•Potential use may occur•Longer time frame than active upwards of 10 years for Ground water <br /> below structures remediation•May not achieve cleanup levels closure monitoring <br /> Section 9 3 within reasonable length of time-Less <br /> effective in soils with high concentrations of <br /> hydrocarbons,low nutrients or low%of <br /> hydrocarbon biodegraders <br /> Advanced GeoEnvironmental,Inc <br />