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10 <br /> REMEDIATION SYSTEM SUMMARY <br /> In Situ Groundwater Extraction and Treatment System (UVB) <br /> System description: <br /> tA 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 prior to removal Vapors stnpped 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 Thernitech VAC 25 thermal/catalytic oxidizer, to destroy volatile organic <br /> tcompound 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 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 /> Refining and Supply Company) <br />' Modifications made during reporting period/reasons for modifications <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, as of 11 June 2003) <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 /> C Tmjmis1739d21PUBLICIO_K_n.3\Quarterky Pmgress RgwO3942 Q0603_,y5tentL1m 3 <br /> I <br />