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' REMEDIATION SYSTEM SUMMARY <br />' In Situ Groundwater Extraction and Treatment System(UVB) <br /> System description: <br />' A vacuum vaporizer wells stem,known as UVB( nterdruck Verdam fer 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 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 then-nal/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 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) <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 /> IG 1Projo=\73942TUBLIMO—&_NtQv rtedy Progress Repott12005U942 Q0605 system dm 3 <br />