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1 <br />' REMEDIATION SYSTEM SUMMARY <br /> • In Situ Groundwater Extraction and Treatment S stem <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 /> stripping unit to treat any accumulated water pnor to removal Vapors stripped from groundwater in <br /> the UVB air stripper are extracted by the UVB 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 /> compound vapors in a heated chamber pnor to release into the ambient air <br /> System startup date: 6 February 1997 <br /> Active extraction wells. None <br /> 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 /> Joaquin County Public Health Services and ExxonMobil <br /> IRefining and Supply Company) <br /> Modifications made during reporting period/reasons for modifications: <br /> No modifications <br /> Status of system operation during reporting penod/reasons for downtime: <br /> The UVB system did not operate during the first quarter of 2002 <br />' <br /> System performance data totals (totals since system startup, as of 6 March 2002) <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 /> IUVB system proposed work. <br /> The UVB system will remain shut down <br /> I <br /> I <br /> • <br /> I <br /> G 1Pralects1739421PUBLIC\O_8_�.11Quarredy Progress Report0942 Q0302_.ystemdoe 2 <br />