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07 April 1997 AGE-NC-95-0103 Page 4 of 5 3.2. INSTALLATION OF IN-SITU AIR SPARGING POINTS 1. Advance six soil probe borings using a van-mounted Geoprobe equipped with 1.125-inch diameter rods. Probe borings will be advanced to a vertical depth of approximately 30 feet. 2. Complete probe boings as IAS wells using 42-inch PVC sparging points. Sparge points consist of a 21-inch stainless steel screen assembly and 3/8-inch PVC tubing. 3. Install a silica gel filter pack to two feet above the sparge points and a two-foot bentonite plug will be placed above the filter pack in each probe boring. 4. Seal the well with Portland cement to the surface and complete the well with a traffic rated well box. Sparging well design is illustrated on Figure 5. 3.3. IAS/VES SYSTEM INSTALLATION The following procedures will be performed for the installation of the IAS system: 1. Install one-inch diameter PVC piping from each sparging well to a manifold. Valves will be installed to allow direction control of injected air. Piping will be installed in trenches and a flush surface installed over the piping. 2. Air will be provided to the IAS wells using the AGE-designed EnviroSparge system. The EnviroSparge includes a large-capacity, motor-driven compressor with an automatic timer for controlled operation. The EnviroSparge unit will be connected to each IAS well,through the subsurface piping network. 3. Install two-inch diameter PVC piping from the new vapor recovery well,VW-1 and VE-1 into the SVE network. The extracted vapors will be routed the thermal oxidizer, for destruction. 3.4. SYSTEM MONITORING Initial monitoring (start-up) of the IAS system will be conducted on a weekly basis for the first 30 days of operation. System monitoring will then be conducted on a monthly basis. Modifications to the monitoring will be considered after several months of operation. Ground water monitoring procedures will continue on a quarterly basis.