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1 REMEDIATION SYSTEM SUMMARY <br /> -5 <br />' In Situ Groundwater Extraction and Treatment System (UVB) <br /> System description: <br />' A vacuum vaporizer wells stem, known as UVB Unterdruck Verdam fer Brunnen is capable of <br /> P Y ( P )� P <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 prior 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 prior to release into the ambient air <br /> System startup date: 6 February 1997 <br />' Active extraction wells None <br /> Inactive extraction wetls/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 /> Refining and Supply Company ) <br />' Modifications made during reporting period/reasons for modifications: <br /> No modifications <br />' Status of system operation during reporting period/reasons for downtime: <br />' The UVB system did not operate during the first quarter of 2002 <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 /> 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 /> 1 <br /> 1 <br />' G\Pro}&Lts\73942\PUBLIOO_& MNQuarterly Progress Report0947.Q0302_systenida 2 <br />