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12 September 2003 AGE-NC Project No. 01-0865 Page 3 of 7 is depicted in Figure 5.In the trench,two-inch diameter,schedule 80 PVC piping will be routed from the well-head at EW-1 to the proposed ground water treatment system.Following piping placement, the trench will be backfilled with imported road-base sand, compacted and resurfaced with sod in the grass area and concrete in the parking lot. 3.4. PROPOSED INTERIM GROUND WATER REMEDIATION SYSTEM Utilizing a submersible air-driven pump, ground water will be extracted from EW-1 and routed through the underground piping to a 750-gallon above ground poly storage tank(holding tank).From the holding tank, ground water will be processed through a three-stage treatment system. The first two stages of the pump and treat system will utilize two 2,000-pound media canister of granular activated carbon(GAC)to address dissolved total petroleum hydrocarbons as gasoline(TPH-g)and benzene, toluene, ethyl-benzene and xylenes (BTEX) in extracted ground water; the final stage of treatment will address MTBE and other fuel oxygenated compounds utilizing one 2,000-pound canister of SunSolve,a patented material that has an affinity to absorb MTBE.A schematic diagram of the GAC/SunSolve ground water treatment system is depicted in Figure 6,additional information is provided in Appendix C.Treated water can be discharged either directly into the Delta Waterway System, or through surface/land use irrigation all pending permitting or permission. The most efficient and economically feasible method would be direct discharge into the Delta Waterway System. AGE proposes to operate the pump-and-treat interim remediation system within the first groundwater table until directed otherwise by the CRWQCB. A approximately 15-foot wide by 20-foot long, chain-link, gated enclosure will be installed just northeast of the AST enclosure to secure the ground water treatment system. The proposed remediation system fencing enclosure is illustrated in Figure 4. 3.5. INTERIM REMEDIATION START-UP PERIOD During the pump and treat start-up period(first two weeks of operation),grab ground water samples will be collected on a daily basis from the influent and effluent sampling ports of the treatment system and analyzed for TPH-g, total petroleum hydrocarbons as diesel (TPH-d), BTEX, fuel oxygenated compounds, 1,2-dichloroethane (1,2-DCA) and 1,2-dibromoethane (EDB) to ensure treatment of petroleum-impacted ground water. Additionally,depth to ground water measurements will be collected from monitoring wells,and operational parameters(ground water flow meters,fluid level sensors, total flow indicators) will be monitored daily during the start-up period to ensure optimal removal of dissolved petroleum hydrocarbons.Following the pump-and-treat start-up period, grab influent and effluent water samples will be collected on a monthly basis and the operational parameters will be monitored on a weekly basis to monitor cleanup progress. Advanced GeoEnvironmental,Inc.