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prevent system fouling. If necessary to meet discharge <br /> limitations to the sanitary sewer the air strapper <br /> effluent will be polished by carbon filtrations. The <br /> system effluent will continue to be piped to the <br /> sanitary sewer system on Waudman Avenue through ' <br /> an agreement with the Stockton Sewer District. <br /> 4. Install a soil vapor extraction system to reduce the <br /> potential for hydrocarbon vapors to infiltrate the <br /> buildings at the site and, additionally to promote same <br /> volatilization of the hydrocarbons adsorbed into soils <br /> thus ._educing a continuing source of contamination. <br /> The system would consist of vertical vadose (vapor) <br /> extraction wells which would be manifolded '_o a low <br /> volume/high vacuum pump to create a negative air <br /> pressure zone around the well points. The vadose <br /> extraction wells would be installed to a depth of 25 <br /> feet using a hollow stem drill rig and would be <br /> _ constructed of 2 inch diameter .020 inch slot PVC well <br /> screen and blank casing. A sand pack and surface seal <br /> similar to the monitoring wells would be installed. <br /> A 15 foot thick surface seal (bentonite and cement) <br /> would be installed to prevent short circuiting of the <br /> vadose well to the ground surface. Two inch PVC piping <br /> would be run below grade from the wellhead to the <br /> blower located in the existing treatment system <br /> compound. The effluent from the air pump would be <br /> directed to a vertical stack and discharged above the <br /> finished roof level of the building. Figure 6 shows <br /> the position of the vapor extraction wells, the lateral <br /> �- subsurface piping and the air pump. <br /> 5. Subsequent to the installation of the additional <br /> monitoring wells, pumping wells and .vapor system a <br /> monitoring and maintenance program would be established <br /> t�! <br />