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i a TABLE 4 SOIL AND GROUND WATER CORRECTIVE ACTION ALTERNATIVES Bob's Muffler Shop 466 Moffat Boulevard, Manteca, California Estimated Costs Typical Monitoring. Estimated Method Advantages Disadvantages (incl.Monitoring Requirements Duration and Maintehance) Excavation •Theoretical removal of 100%of •Cost-effectiveness decreases with $1,000,000 to Monitoring of excavated 1 month;6 to 12 contaminants•Relatively short depth and/or width of contamination $2,000,000 for soil;collection of soil months if Section 6.1. remediation period•Effective •Cannot cleanup under structures• excavation,disposal samples upon treatment is remediation of all soil types. Excavated soil must be treated or 'and backfill. completion of required. disposed•Backfill material and excavation. compaction costs can be excessive. In-situ Soil'Vapor •Easily combined with other. Greater than 90%reduction of $25,000 to$30,000 Weekly and monthly 18 to 24 months Extraction methods(i.e.IAS)•Readily contaminants generally not attainable annually. vapor sampling;semi- available equipment'-Conducive •Large initial equipment cost• annual or annual soil Section 6.2. site conditions•Relatively rapid Supplemental fuel required and costs sampling. cleanup period(10 to 36 months)• can be excessive as contaminants Can cleanup contaminated soil decrease•Air permitting required under structures/roads. Only non-saturated soils cleaned up. In_situ •Relatively simple design and •Regulatory approval can be difficult $70,000 to$160,000 Monthly vapor 18 to 36 months Bioremediation operation a Short treatment period, to obtain• ,3.dditional inoculations total cost monitoring;quarterly (Soil) usually,12 to 36 months•Works and nutrient supplementation soil sample collection; well in most soil types where no sometimes necessary•Less effective micro biological analysis Section 6.3. biotoxicity is present. in soils with high concentrations of of samples. hydrocarbons. • Natural Attenuation •Lower costs than most active •Not effective for higher $11,000 to$30;000 Installation-of additional unknown remedial alternatives•Minimal contaminant concentrations• Annually borings;Ground water Section 6.4. disturbance to the site•Potential Migration of contamination may monitoring use below structures. occur•Longer time frame than active remediation•May not achieve cleanup levels within reasonable length of time . Advanced GeoEnvironmentat,Inc.