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generally fine-grained, it is unlikely that water circulation will successfully deliver the <br /> necessary nutrients to enhance biodegradation. Because gasoline 1•1drocarbons are relatively <br /> volatile, -1 is also unlikely that induced bioremediation using forced-air circulation will <br /> reduce hydrocarbon concentrations faster than vapor extraction alone. For these reasons, <br /> ® induced bioremediation is not considered a viable alternative for this site. <br /> Ground-Nater Remediation <br /> Dissolved gasoline hydrocarbons are present in ground water underlying the former leaky <br /> 0 tank; floating gasoline has not been observed. Therefore, facilities for recovery,separation, <br /> and disposal of free-phase gasoline will not be required. Ground water with dissolved <br /> gasoline constituents can be remediated by extraction .and treatment and natural <br /> ~^ degradation. As an alternative to extraction, the affected ground water can be physically <br /> contained and isolated from further migration. <br /> Ground-Nater Extraction and Aboveground Treatment <br /> Remediation of ground water containing dissolved gasoline hydrocarbons can be <br /> accomplished by extraction of the affected ground water, aboveground treatment, and <br /> disposal of the treated water. Ground-wafer extraction is accomplished by pumping from <br /> recovery wells or trenches. The loca�ion of the recovery wells or trenches, the depth from <br /> which ground water is extracted, and the extraction rates are chosen to induce artil:cial <br /> hydratilic gradients which effectively capture the affected ground water and cause it to flow <br /> bd <br /> .4pp/1001 GOOSySA91M <br />