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3. On the basis of the operational area of influence of vapor extraction and the indicated transimssivity of vapor in the shallower soils, propose and install additional vapor extraction wells as necessary To optimize the remediation of former Exxon RS 7-3942 as a whole, the groundwater extraction and treatment system and the soil vapor extraction and treatment system have been designed to work cooperatively. A groundwater extraction system is proposed to capture the plume of dis- solved hydrocarbons and to dewater the soils where the hydrocarbons have been trapped below the water table, allowing the vapor extraction system to reach this area and to remediate these ' soils more effectively and rapidly In addition, the catalytic oxidizer used to treat the extracted soil vapors will also be used to treat the effluent from the air stepper of the groundwater treat- ment system. ' 21 SCOPE OF WORK AND TECHNICAL APPROACH FOR GROUNDWATER REMEDIATION 1 EA proposes to design, construct, and install a groundwater extraction and treatment system ' (GETS) The GETS, as conceived, will consist of(a) five groundwater extraction wells (RW1, RW2, RW3, RW4, Vl), (b) three infection wells (MW4, MW7, IW1) to isolate the site and limit the area of influence of groundwater extraction, and (c) a water treatment system that will consist of an air stripper followed by activated carbon polishing of the air stripper effluent The effluent air from the air stripper will be piped to the catalytic oxidizer that is used to treat the extracted soil vapor A process and instrumentation diagram is included as Figure 9, a flow diagram as ' Figure 10. ' Remediation of groundwater and soils will be complicated by two factors. (1) petroleum hydro- carbons have been stranded below the water table, and (2) there appears to be an upgradient source of hydrocarbons that could be pulled onto the site To optimize the remediation of the site ' as a whole, a groundwater extraction and treatment system and a soil vapor extraction and treat- ment system have been designed to work cooperatively The groundwater extraction system is proposed to capture the plume of dissolved hydrocarbons and to dewater the soils where the ' hydrocarbons have been trapped below the water table, allowing the vapor extraction system to reach this area and more effectively and rapidly remediate these soils In turn, the catalytic oxidizer used to treat the extracted soil vapors will also be used to treat the air stripper effluent of ' the groundwater treatment system. Pending implementation of a groundwater system to contain the apparent upgradient plume, EA proposes to infect treated water into three wells to create a ' hydraulic barrier between the two sites. Two additional downgradient wells (MW11, MW12) have been installed, and the groundwater has not been impacted at these two locations cW--A n394�uI91AX 12