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� � tib � �� �_ � � tiii� � � � i 1• f� i� �� � <br /> TABLE 7 <br /> Soil and Ground Water Corrective Action Alternatives <br /> CALIFORNIA FUELS CARDLOCK STATION <br /> j 2402 Pacific Avenue, Stockton, California <br /> Estimated Costs(incl Typical Monitoring Estimated <br /> Method Advantages disadvantages Monitoring and <br /> Maintenance Requirements Duration <br /> In-situ Soil Vapor •Easily combined with other Greater than 90%reduction of $60,000 to$100,000 Weekly and monthly 18 to 24 <br /> Extraction methods(i a IAS)• Readily contaminants generally not annually vapor sampling,semi- months <br /> available equipment• attainable•Large initial annual or annual soil <br /> Section 7 1 Conducive site conditions• equipment cost•Supplemental sampling <br /> Relatively rapid cleanup period fuel required and costs can be <br /> (18 to 36 months)•Can cleanup excessive as contaminants <br /> contaminated soil under decrease•Air permitting <br /> structures required•Only non-saturated <br /> soils cleaned up <br /> Excavation -Theoretical removal of 100% -Cost-effectiveness decreases $125,000 to$175,000 Monitoring of 1 month,6 to <br /> j of contaminants• Relatively with depth of contamination • for excavation, excavated soil, 12 months if <br /> Section 7 2 short remediation period • Cannot cleanup under disposal and backfill collection of soil treatment is <br /> Effeclive remediation of all soil structures•Excavated soil samples upon required <br /> types must be treated or disposed• completion of <br /> Backfill material and excavation j <br /> compaction costs can be <br /> excessive <br /> !n-situ •Relatively simple design and • Regulatory approval can be $80,000 to$130,000 Monthly vapor 18 to 36 <br /> Bioremediation operas ion•Short treatment dtfficult to obtain•Additional total cost monitoring,quarterly months <br /> (Soil) period,usually 12 to 36 months inoculations and nutrient soil sample collection, <br /> • Works well in most soil types supplementation sometimes micro biological <br /> Section 7 3 where no biotoxicity is present necessary• Less effective in analysis of samples <br /> soils with high concentrations <br /> of hydrocarbons <br /> I <br /> i <br /> Advancer!GcoEnvironmenial,Inc <br />