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TABLE 5 <br /> SOIL AND GROUND WATER CORRECTIVE ACTION ALTERNATIVES <br /> Former Chase Chevrolet (Van Buren) Facility <br /> 424 North Van Buren Street, Stockton, California <br /> Estimated Costs Typical <br /> Method Advantages Disadvantages (incl Monitoring Estimated <br /> Monitoring and Requirements Duration <br /> Maintenance) <br /> In-situ • Relatively simple design and • Usually no immediate $105,000 to Monthly ground water 24 to 36 <br /> Bioremediation application process• Little or no reduction in hydrocarbon $135,000 total cost and vapor sampling, months <br /> (Ground Water) maintenance required concentrations• RemedLation quarterly monitoring, <br /> controls difficult to implement microbiological <br /> Section 6 3 • Regulatory acceptance analysis of samples <br /> difficult to obtain • Waste <br /> discharge permits sometimes <br /> required <br /> Natural Attenuation • Lower costs than most active •Not effective for higher Quarterly ground Unknown <br /> remedial alternatives• Minimal contaminant concentrations• water monitoring <br /> Section 6 4 disturbance to the site• Potential Migration of contamination <br /> use below structures may occur• Longer time frame <br /> than active remediation • May <br /> not achieve cleanup levels <br /> within reasonable length of <br /> time•Not generally perm.-ted <br /> when tree product is present <br /> I <br />