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REMEDIATION SYSTEM SUMMARY <br />' In Situ Groundwater Extraction and Treatment System UVB <br /> System description. <br />' A vacuum vaporizer well system,known as UVB(Unterdruck Verdampfer Brannen),was capable of <br /> extracting groundwater from one well, UVB The WB treatment system consisted of an in-situ, <br /> 400-millimeter-diameter reduced pressure air stripper and a 5-horsepower blower and mcluded a <br /> weatherproof cover and moisture knockout drum The moisture knockout drum had a built-in <br />' strippmg unit to treat any accumulated water prior to removal Vapors stripped from groundwater in <br /> the UVB air stripper were extracted by the WB vacuum blower The pressure outlet of the UVB <br /> blower was connected to a Thermtech VAC 25 thermal/catalytic oxidizer,to destroy volatile orgarnc <br /> compound vapors in a heated chamber prior to release into the ambient airt <br /> 3 $ <br /> System startup date: 6 February 1997 1 <br />' Active extraction wells: None 1 r <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 /> Refinmg 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 /> 1 <br /> 1 <br />' G 11roj—\73942WfiUM_&_M\Quaencr1y Progress Rcport12005U942 Q1205_sy cmdoc 3 <br />