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' REMEDIATION SYSTEM SUMMARY <br /> • <br />' In Situ Groundwater Extraction and Treatment System UVB <br /> System description <br /> A vacuum vaporizer well system, known as WB (Unterdruck Verdampfer Brunrren), 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 WB <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 wells/reason: UVB (The system was shut down on 22 September 2000 as <br /> proposed dunng 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 /> IStatus of system operation during reporting ortingperiod/reasons for downtime- <br /> The UVB system did not operate <br /> System performance data totals (totals since system startup, as of 25 March 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 /> IUVB system proposed work <br />' The WB system will remain shut down <br /> I <br />' G lPinlects%T3942VPUDLICIO_&_WQuanei ly Progress Repo,-t%3942 Qi)3U3_systmi doe 3 <br />