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I <br />' 07 November 2003 <br /> • AGE-NC Project No 98-0492 <br /> Page 6 of 9 <br /> 5.0 SOIL REMEDIATION ALTERNATIVES <br />' Based on low concentrations of toluene and MTBE detected lnjust a few soil samples collected from <br /> Ithe site, AGE believes soil remediation is unnecessary <br />' 6.0. GROUND WATER REMEDIATION ALTERNATIVES <br /> AGE recognizes that two methods for remediation are readily applicable for the contaminate at the <br />' site, one consists of ground water extraction/treatment and disposal and the second is use of the <br /> in-situ ozone oxidation-sparging AGE believes the use of the in-situ mechanism is the appropriate <br /> remedial technology to be consider to address MTBE-impacted ground water on the site <br /> I <br /> 61 GROUND WATER EXTRACTION <br />' There are several different methods for treatment of extracted ground water, which are collectively <br /> called "pump and treat" As the name indicates, all methods involve extraction and transfer of <br />' • contaminated ground water from the aquifer to an above-ground treatment or disposal/recycling <br /> facility The extraction is performed using an automatic pump system to maintain capture <br /> characteristics in the aquifer and to assure that process volume requirements are maintained After <br />' treatment, the water is usually discharged into a sanitary sewer and a sanitary sewer connection is <br /> available at the site <br />' <br /> 611 Ground Water Treatment Methods <br />' The documented presence of dissolved hydrocarbons will require treatment for the recovered water <br /> Two of the most common methods of water treatment are air stripping and carbon adsorption Air <br />' stripping involves removal of volatile organic compounds from ground water by promoting the <br /> transfer of contaminants from the dissolved phase to the vapor phase The process usually works well <br /> with volatile organic compounds, but less successfully with longer-chained hydrocarbons, such as <br />' commonly occur in diesel fuel Carbon adsorption utilizes granular activated carbon to simply <br /> "filter" organic compounds out of ground water <br />' A third, but less common method of above-ground treatment of water is bioremediation <br /> Contaminated ground water is "treated" by adding hydrocarbon-degrading microbes or by <br /> augmenting natural hydrocarbon degradation activities with the introduction of-nutrients However, <br />' MTBE is not rapidly treated by bioremedation <br /> • <br />' Advanced Geo Environmental,inc <br />