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Former Beacon Station No 12419 March 18,2002 <br /> Stockton California Problem Assessment Report/Corrective Action Plan <br /> MW-3 (screened intervals 65 to 85 feet bsg) Increasing the number of soil vapor extraction <br /> and air sparge points would enhance the effectiveness of the remediation systems and further <br /> promote natural attenuation processes <br /> Groundwater extraction has been demonstrated as a feasible alternative in that the calculated <br /> radius of influence would be sufficient to capture impacted groundwater However, the <br /> necessity of a groundwater extraction system should be considered only after evaluation of <br /> the effects of soil vapor extraction and air sparging systems on the soil and groundwater <br /> environments <br /> 12.2 Description of Proposed Remedial Installations <br /> Horizon proposes the installation of soil vapor extraction and air sparge remediation systems <br /> connected to the soil vapor extraction and air sparge wells and possibly existing monitoring <br /> wells The wells would be connected to a remediation system compound as shown on <br /> • Figure 9 The SVE installation would consist of the following elements: <br /> • Soil vapor conveyance piping in trenches from vapor extraction wells VW-1, VW-2 and <br /> monitoring wells MW-9 to a remediation compound located behind the station building, <br /> • A process control manifold for the vapor extraction piping, <br /> • Thermal oxidizer for the treatment of extracted soil vapors, concentrations of TPHg from <br /> vapor extraction well VW-2 during the SVET ranged up to 8,000 ppm, and <br /> • Appropriate valve flow controllers, sampling ports, and pressure and air temperature <br /> sensors <br /> The air sparge installation would consist of the following elements. <br /> • An approximately 5 cubic feet per minute, oilless, electrically-driven compressor, <br /> 419PARCAP3-02 doe 27 <br /> Project No 1419 23 HORIZON ENVIRONMENTAL INC <br />