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of hydrocarbons in ground water has been shown to be very limited <br /> and relatively stable over time Therefore, containment strategies are <br /> not required for this site <br /> Ground Water Extraction and,TrealMent <br /> Ground water extraction and treatment is generally an effective <br /> method for the treatment of hydrocarbons in water This alternative <br /> consists of installing wells into the saturated zone and reversing the <br /> hydraulic gradient by extracting the affected ground water The ground <br /> water is then either treated to remove the constituents of concern or <br /> discharged directly to the city sewer lines Typical treatment methods <br /> include air stripping and liquid-phase activated carbon filtration <br />' Ground water extraction and treatment is a proven, effective method <br /> for remediating hydrocarbons in ground water and reducing the <br /> potential migration of chemicals in ground water Implementation of <br /> this alternative would be simple because conventional drilling <br /> equipment is normally used For this site, existing monitoring wells <br /> could potentially be utilized as extraction wells, which would result in <br /> a significant cost savings Ground water treatment costs would be <br /> dependent upon operational parameters including permitting <br /> requirements, extraction flow rates, and time required for treatment <br /> Ground water extraction and treatment is effective and could be <br /> implemented, and therefore is considered a potentially appropriate <br /> remedial alternative for the site. <br /> An available option for this alternative would involve the extraction <br /> of a fixed volume of hydrocarbon-containing ground water during a <br /> single pumping event (ground water would be extracted from the <br /> existing monitoring wells) The extracted water could be aerated and <br /> discharged directly to the sewer, or aerated, polished with liquid-phase <br /> activated carbon, and then discharged to the sewer This option is <br /> appropriate given the limited extent of the hydrocarbons in ground <br /> water at both sites It may be possible to remove the bulk of the <br /> hydrocarbon-containing ground water at each site by extracting a <br /> ground water aliquot This would expedite natural degradation of any <br /> residual hydrocarbons A steady decline in concentrations of <br /> hydrocarbons in ground water at Site #1 has already been observed <br /> over time Also, no significant migration of chemicals in ground water <br /> has been observed over time In fact, the extent of hydrocarbons in <br /> ground water at both sites has been relatively stable over time <br /> 4-7 <br />