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0 12 September 2003 AGE-NC Project No. 01-0865 Page 6 of 7 The process pump,located directlybehind the holding tank(Figure 6),passes extracted groundwater from the holding tank to the treatment system.The pump will be controlled by a PumpTec controller; as well as additional electrode switches placed at various levels in the holding tank. An emergency shut-off switch will be located immediately below the top of the holding tank,an intermediate pump- on switch will be placed approximately 8-inches below the emergency shut-off switch and activate the process pump,and intermediate pump-off switches will be utilized near the bottom ofthe holding tank to tum the process pump off. The first treatment stage consists of passing contaminated ground water through two 1,000-pound GAC absorption vessels;the final treatment stage consists of passing the GAC-treated ground water through the 1,500-pound SunSolve absorption vessel. The first vessels are designed to adsorb TPH-g, TPH-d, BTEX and chlorinated solvent compounds. The final vessel contains SunSolve, a liquid phase filtration media specifically designed to adsorb fuel oxygenated compounds(i.e.TAME, MTBE and TBA). Sample ports will be located between all vessels to allow detection of potential media break through and to obtain final discharge samples.The system layout is depicted in Figure 6. Electricity is readily available to the site. A dedicated electrical meter will be installed by representatives of P.G. &E. that will connect directly to the pump and treat system. 4.5. GROUND WATER EXTRACTION START-UP PERIOD During the pump and treat start-up period(first two weeks of operation),ground water influent and effluent of the treatment system, depth to ground water measurements and operational parameters (ground water flow meters, fluid level sensors, total flow indicators) will be monitored daily to ensure optimal removal of dissolved hydrocarbons and dissolved MTBE;thereafter, operation and maintenance procedures will be performed on a weekly basis and ground water samples will be collected on a monthly basis. 4.6. PUME-AND-TREAT MONITORING AND MAINTENANCE ACTIVITIES Ground water samples from the pump and treat system influent and effluent stages will be collected on a monthly basis and submitted to a DHS-certified laboratory for analysis of contaminants listed in Section 3.6. Ground water treatment operational parameters will be recorded weekly to monitor cleanup progress, and the ground water treatment system will be maintained on a weekly basis according to manufacturers recommendations. Advanced Geo F,nvironmcntal,Inc.