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f ' ' TABLE 7 CORRECTIVE ACTION OPTIONS ' Mel Bokldes Petroleum - 501 West Lodi Avenue Lodi, California Method Advantages Disadvantages Estimated Costs(incl tMonitoring and Maintenance) ' In-situ Soil Vapor • Easily combined with Greater than 90% $40,000 to$75,000 Extraction other methods(i a IAS)• reduction of annually Readily available contaminants generally equipment•Conducive not attainable • Large ' site conditions• initial equipment cost- Relatively rapid cleanup Supplemental fuel period(18 to 24 months) required and costs can be ' • Can cleanup excessive as contaminated soil under contaminants decrease structures Air permitting required- Only non-saturated soils cleaned up Excavation • Theoretical removal of - Cost-effectiveness Could exceed$90,000 for ' 100%of contaminants • decreases with depth of excavation,treatment Relatively short contamination • Cannot and/or disposal could remediation period cleanup under structures• exceed $250,000 After removal,excavated soil must be treated or disposed• Backfill ' material and compaction costs can be excessive In-situ Bioremediation • Relatively simple • Regulatory approval can $60,000 to ' (Soil) design and operation • be difficult to obtain • $110,000 total cost Short treatment period, Additional inoculations usually 12 to 24 months• sometimes necessary- ' Works well in most soil Nutrient addition types where no sometimes necessary biotoxicity is present Not effective in soils with high concentrations of hydrocarbons ' In-situ Air Sparging - Cleanup technique • Initial equipment/design $25,000 to$50,000, compatible with site costs can be costly• annually depending upon conditions• Combines capitol treatment period well with SVE• Readily available equipment• y Site conditions are ' conducive for]AS treatment -Little equipment maintenance I0 required Advanced GeoEnviron mental,Inc 1