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' TABLE 8 CORRECTIVE ACTION OPTIONS RIPON FARM SERVICE 22871 South Highway 99, Ripon, Caltfonua ' Method Advantages Disadvantages Estimated Costs (incl. Monitoring and Maintenance In-situ Soil Vapor • Easily combined with Greater than 90% $40,000 to$75,000 Extraction other methods (t a IAS)• reduction of annually Readily available contaminants generally equipment• Conducive not attainable• Large site conditions • mitral equipment cost- Relattvely 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 design • Regulatory approval can $60,000 to (Soil) and operation • Short be difficult to obtain • $110,000 total cost treatment period,usually Additional inoculations 12 to 24 months • Works sometimes necessary ' well in most soil types Nutrient addition where no btotoxicrty is sometimes necessary present Not effective in sods with high concentrations of hydrocarbons ' In-situ Air Spargrng • 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 ' Site conditions are conducive for [AS treatment• Little equipment maintenance required Advanced Geo£nvironmentaI,Inc