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Biotreatment <br /> Biotreatment of hydrocarbons in ground water would involve either <br /> in situ or ex situ methods For passive in situ treatment, the <br /> appropriate nutrients and microbes would be injected directly into the <br /> affected ground water to stimulate in situ bioremediation <br /> Alternatively, for active in situ treatment, affected ground water could <br /> be extracted, aerated and inoculated with nutrients and microbes, and <br /> reinjected upgradient of the extraction point For reinjection, ground <br /> water could be trickled into an infiltration gallery (e g , trenches) <br /> located within the hydrocarbon-containing soils, which would also <br /> enhance the biodegradation of hydrocarbons in soil (this option <br /> assumes that hydrocarbon-containing soils would not be excavated as <br /> part of another soil remedial strategy) For ex situ biotreatment, the <br /> water would be extracted and treated in a bioreactor (the treated water <br /> could also then be reinjected via an infiltration gallery to enhance <br /> biodegradation of hydrocarbons in soil) <br /> Both in situ and ex situ biotreatment could effectively remediate <br /> ground water at the site Ex situ treatment of ground water in a <br /> bioreactor would be more expensive than the other alternatives and <br /> was therefore eliminated However, both in situ biotreatment <br /> alternatives would be potentially effective remedial alternatives for the <br /> M site <br /> Chemical Oxidation <br /> This alternative would involve either in situ or ex situ treatment of <br /> the hydrocarbons in ground water via chemical oxidation This <br /> technology utilizes a chemical oxidant (e g hydrogen peroxide or <br /> ozone) to oxidize the organic chemicals in ground water to carbon <br /> dioxide and water For in situ treatment, the appropriate chemical <br /> oxidant could be injected directly into the affected ground water For ex <br /> situ treatment, the ground water would be extracted and treated in a <br /> reactor vessel <br /> Both in situ and ex situ chemical oxidation could effectively remediate <br /> ground water at the site However, in situ chemical oxidation can be <br /> potentially difficult to control and monitor, and ex situ chemical <br /> oxidation would be even more costly than ex situ biotreatment. <br /> Therefore, both chemical oxidation alternatives were eliminated from <br /> consideration <br /> 4-8 <br />