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i 21 May 2003 AGE-NC Project No 95-0130 Page 8of16 utilizing a Magnehelic vacuum gauge attached to the inlet of the blower, SVE air flow will be monitored using a Dwyer DS-200 flow sensor Sampling ports will be installed upstream of the vacuum blower inlet to recover SVE influent air flow vapor stream samples,and downstream of the catalytic converter to recover effluent SVE air flow samples and to monitor the efficiency of hydrocarbon destruction A schematic diagram of the SVE treatment system is depicted in Figure 7, additional information is in Appendix B 3 5 PROPOSED INTERIM GROUND WATER REMEDIATION SYSTEM Utilizing submersible Grundfos pumps,ground water will be extracted from wells EW-1 and EW-2 and routed through the underground piping to a 1,000-gallon above ground storage poly tank (holding tank) From the holding tank,groundwater will be processed through a four-stage treatment system The first two stages of the pump and treat system will utilize two 2,000-pound media canisters of granular activated carbon (GAC) to address dissolved TPH-g and BTEX in extracted ' ground water, the final two stages of treatment will address MTBE and other fuel oxygenated compounds utilizing two 1,500-pound canisters of SunSolve,a patented material that has an affinity to absorb MTBE A schematic diagram of the GAC/SunSolve ground water treatment system is tdepicted in Figure 8,additional information is in Appendix C Treated water will be discharged into the City of Stockton sanitary sewer system located approximately 10 feet north of the site on Market Street AGE proposes to operate a pump-and-treat interim remediation system within Hydrologic Unit I until directed otherwise by the SJCEHD or the RWQCB 3 6 INTERIM REMEDIATION START-UP PERIOD I During the SVE start-up period (first week of operation), influent and effluent air-flow vapor samples will be collected on a daily basis and submitted for laboratory analysis of TPH-g,BTEX and MTBE to monitor hydrocarbon destruction efficiency,during this time,SVE operational parameters ' including soil-gas vapor concentrations, air flow, vacuum and temperature will be monitored on a daily basis to gauge the optimal destruction rate of recovered hydrocarbon vapors Following the SVE start-up period, air-flow vapor samples will be collected on a monthly basis and the SVE ' operational parameters will be monitored on a weekly basis to monitor cleanup progress 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,BTEX, fuel oxygenated compounds, 1,2-DCA and EDB to ensure treatment of petroleum-impacted ground water Additionally,depth to ground water measurements ' will be collected from momtonng 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 IAdvanced GeoEnvironmental,Inc I