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TABLE 7 SOIL AND GROUND WATER CORRECTIVE ACTION ALTERNATIVES Elkhorn Cowitry Club 1050 Elkhorn Drive, Stockton, California Estttnatea Costs Ty�xcat 1VletliodAAVv i to es d: n. �sin Estimated g 9rntor�ng Manrtori ng;and D". raton' tenance) d. l�azi Regmre�nerYls In-situ Soil Vapor •Easily combined with other Greater than 90%reduction of $ 50,000 to$75,000 Weekly and monthly i 24 months Extraction methods(i.e. IAS)• Readily contaminants generally not annually vapor sampling;semi- available equipment• attainable • Large initial annual or annual soil Conducive site conditions• equipment cost• Supplemental sampling. Relatively rapid cleanup period fuel required and costs can be (18 to 24 months)•Can cleanup excessive as contaminants contaminated soil under decrease •Air permitting structures- required • Only non-saturated soils cleaned up. Excavation • Theoretical removal of 100% Cost-effectiveness decreases Could exceed Monitoring of 1 month;6 to of contaminants • Relatively with depth of contamination• $250,000 for excavated soil; 12 months if short remediation period. Cannot cleanup under excavation; collection of soil treatment is structures•After removal, treatment and/or samples upon required. excavated soil must be treated disposal could completion of or disposed•Backfill material exceed $200,000 excavation. and compaction costs can be excessive. In-situ •Relatively simple design and • Regulatory approval can be Monthly vapor 12 to 24 Bioremediation operation • Short treatment difficult to obtain•Additional monitoring; quarterly months (Soil) period, usually 12 to 24 months inoculations sometimes soil sample collection; • Works well in most soil types necessary•Nutrient addition micro biological where no biotoxicity is present. sometimes necessary •Not analysis of samples. effective in soii.s with high concentrations of hydrocarbons. .