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sites The plume is relatively well defined at this site, so, with additional information <br /> ' gained from aquifer tests, design of an effective extraction system is feasible <br /> Extraction of the groundwater is a feasible option at this site <br /> ' 6.1.2 Treatment <br /> Successful treatment of the groundwater reduces the toxicity, mobility, or <br /> ' volume of a contaminant This reduction can be accomplished through <br /> physical/chemical, biological, or thermal processes Several treatment technologies <br /> ' are applicable either in situ or after extracting the groundwater Treatment processes <br /> applicable to TPH-g and BTEX in groundwater include liquid phase carbon, <br /> bioremediation, ultraviolet/oxidation, and volatilization These processes are <br /> ' commonly used for remediation and have been demonstrated to be technically <br /> feasible <br /> 6.1 2.1 Liquid Phase Carbon. In liquid phase carbon treatment, the groundwater <br /> is first extracted and then passed through a bed of activated carbon Successful <br /> treatment relies on the adsorption of contaminants onto the carbon media The <br /> contaminants must have a greater affinity for the carbon media than the groundwater <br /> Treatment of petroleum hydrocarbons by carbon adsorption is most effective for non- <br /> polar organics The evaluation of this technology is included on Table 5 <br /> 6.1.2.2 Bioremediation. Bioremediation is a form of treatment that can be applied <br /> ' to either extracted groundwater or in situ Treatment is achieved by allowing a <br /> microbial population to metabolize the contaminants into carbon dioxide and water <br /> ' Treatment of extracted groundwater requires the use of a bioreactor to which <br /> nutrients and microbes can be added along with the groundwater This technology <br /> is evaluated on Table 5 <br /> rIn situ treatment can be either active or passive Active treatment involves the <br /> addition of nutrients, oxygen, and microbes as required Low levels of hydrogen <br /> ' peroxide may be injected to provide an oxygen source Hydrogen peroxide would <br /> also assist in decreasing bacterial clogging at the injection point Passive treatment <br /> ' relies on the existing microbial population and nutrients to achieve natural <br /> attenuation of the contaminants Bioremediation has been used successfully to <br /> remediate contamination of groundwater by petroleum products Platelet and <br /> nutrient studies to determine the existing presence of microbes, nitrogen, and trace <br /> nutrients would be required prior to implementing this technology Pilot testing may <br /> 931222 East Say Municipal Utility Distnct <br /> 40429500 asa 14 Stockton Svc Ctr -Site Assessment/Remedial Options <br />