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' REMEDIATION SYSTEM SUMMARY <br /> • <br />' In Situ Groundwater Extraction ,and Treatment SvstemfUVBI <br /> System description <br /> A vacuum vaporizer well system, known as UVB (Unterdruck Verdampfer Brannen), was capable <br /> of extracting groundwater from one well, UVB The UVB treatment system consists of an in situ, <br />' 400-millimeter-diameter reduced pressure air stripper and a 5-HP 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 <br />' in the UVB air stripper are extracted by the UVB vacuum blower The pressure outlet of the UVB <br /> blower is connected to a Therrntech VAC 25 thermal/catalytic oxidizer, to destroy VOC vapors in <br /> 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 /> No modifications <br /> Status of system operation during reporting period/reasons for downtime: <br /> The UVB system did not operate during the fourth quarter of 2001 <br /> System performance data totals (totals since system startup, as of 6 February 1997 <br /> ) <br /> Groundwater extracted: Not Applicable <br /> Pounds of TPH removed. 1998 7 (calculated as TPH-g) <br /> I Pounds of benzene removed 1845 <br /> Pounds of MTBE removed. Not calculated <br /> WB system proposed work <br /> The UVB system will remain shut down to evaluate post-remediation groundwater monitoring <br /> data <br /> • <br /> I <br /> r 1ProIerm\73942%PUBLIC�0—&—MtQuarterly Progress keportNQ[201_system doe 2 <br />