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Contaminated Soil <br /> Constituent reatment Method _ <br /> • Gasoline • Soil ventilation <br /> • Diesel fuel • Bio-oxidation <br /> • Motor oil • Bio-oxidation <br /> • Pesticide residue • Soil ventilation/ <br /> bio-oxidation <br /> • Solvent • Soil ventilation and <br /> thermal oxidation <br /> Bio-oxidation and soil ventilation involve converting the hazardous <br /> materials contaminating the soil or ground water into harmless or less <br /> harmful forms. Degradation techniques, particularly biodegradation, <br /> are applicable to organic compounds, which are more easily degraded <br /> than inorganic compounds. <br /> In situ biodegradation can take the form of land farming, where con- <br /> taminants are treated within 2 to 3 feet of the ground's surface; <br /> microbial inoculation, where microbes are added to an aquifer; and <br /> biologically active barriers, where flows of contaminated ground water <br /> are directed to biologically active ponds. <br /> In situ bio-oxidation is often the most economical method of site <br /> mitigation. As noted in DHS's Alternative Technology Rep t (July <br /> 1986) , the advantages of in situ biological treatment include <br /> • A permanent solution and future liabilities are mini - <br /> mized. <br /> • Activity of the residual microbial population continues <br /> long after equipment and personnel have left the site. <br /> • Minimal site disturbance is necessary, often allowing <br /> commercial activities to continue while treatment is <br /> underway. <br /> • Significant reduction or elimination of hauling and dis- <br /> posal costs. <br /> PJ9 9390502D.000 11-20 Rev. 1 11/08/88 <br />