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I <br /> 7 PROPOSED CORRECTIVE ACTION <br /> EMCON Associates has prepared the following sections to evaluate the <br /> alternatives for remediating the petroleum hydrocarbon-impacted soil and <br />' ground water at this site. <br />' 7.1 Soil Remediation Alternatives <br /> The remediation alternatives EMCON Associates has identified can be <br /> classified into two categories: (1) excavation and subsequent disposal or <br />' aeration, or both, and (2) in situ remediation. <br /> In addition to the two categories above, there is a no-action alternative, in <br /> which the impacted soil is left in place, and long-term monitoring of the <br /> ground water is implemented. This alternative has been eliminated because <br /> it is not likely that regulatory agencies would accept the approach given the <br />' remaining petroleum hydrocarbon concentrations in soil. <br /> EMCON Associates does not recommend attempting to implement <br /> alternatives involving excavation of the petroleum hydrocarbon-impacted soil <br /> due to the economics involved in excavating to the depths of impact, and <br /> the difficulty of accessing soil adjacent to existing buildings. Additionally, <br />' excavation would significantly interfere with normal business operations at <br /> the site. For these reasons, soil excavation has been deemed <br />' unacceptable. <br /> Eliminating the alternatives involving excavation of the petroleum <br /> hydrocarbon-impacted soil leaves in situ treatment technologies. In situ <br />' remediation technologies which have successfully been used include <br /> (1) enhanced biodegradation, (2) soil flushing, and (3) soil vapor extraction. <br />' Enhanced biodegradation has successfully been used to remove <br /> contaminants from both soil and ground water. Enhanced biodegradation <br /> typically involves injection of nutrients and oxygen sources under controlled <br />' conditions to enhance biological degradation of organic compounds. In <br /> some instances, this also involves injection of acclimated microorganisms. <br /> The injection process is used in conjunction with ground-water extraction. <br />' This alternative is not recommended due to the technical complications and <br /> expense associated with implementing this technology in comparison to soil <br /> vapor extraction. <br /> pj010f9010*00020.1 ag 7 - 1 Rev. 0 December 15, 1992 <br />