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I <br /> REMEDIATION SYSTEM SUMMARY <br /> IIn Situ Groundwater Extraction and Treatment System B � <br /> System description: <br /> A vacuum vaporizer well system,known as UVB (Unterdruck Verdampfer Brunnen),is capable of <br /> extracting groundwater from one well,UVB The UVB treatment system consists of an in situ,400- <br /> millimeter-diameter reduced pressure air stripper and a 5-horsepower blower and includes a <br /> weatherproof cover and moisture knockout drum The moisture knockout drum has a built-in <br /> I stripping unit to treat any accumulated water prior to removal Vapors stripped from groundwater in <br /> the UVB air stripper are extracted by the LJVB vacuum blower The pressure outlet of the UVB <br /> blower is connected to a Thermtech VAC 25 thermal/catalytic oxidizer, to destroy volatile organic <br /> I compound vapors in a heated chamber prior to release into the ambient air <br /> I <br /> System startup date: b February 1997 <br /> Active extraction wells. None <br /> I Inactive extraction wells/reason: UVB (The system was shut down on 22 September 2000 as <br /> proposed during the 12 September 2000 meeting between San <br /> I Joaquin County Public Health Services and ExxonMobil <br /> Refining and Supply Company) <br /> Modifications made during reporting period/reasons for modifications: <br /> I• <br /> None <br /> Status of system operation during reporting period/reasons for downtime: <br /> The UVB system did not operate <br /> System performance data totals (totals since system startup) <br /> Groundwater extracted: Not applicable <br /> Pounds of TPH removed: 1,998 7 (calculated as TPH-g) <br /> I Pounds of benzene removed: 1845 <br /> Pounds of MTBE removed: Not calculated <br /> UVB system proposed work: <br /> The UVB system will remain shut down <br /> I <br /> I <br /> I <br /> GSPrgects173942TIJBLIOC)—&_WltiQuarterly Progress Report\2004L3942 Q I204_system doc 3 <br />