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I <br /> 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 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 />' stnpp;ng unit to treat any accumulated water prior to removal Vapors stripped from groundwater in <br /> the UVB air stepper are extracted by the UVB vacuum blower The pressure outlet of the UVB <br /> blower 1s 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 wellstreason: 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 /> lieModifications made during reporting period/reasons for modifications: <br /> None <br /> Status of system operation during reporting period/reasons for downtime: <br /> IThe 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 /> 0 5f I Ojrc tsV39321PUBL1C10_&_M1Qulaeriy Progress Repurt12004U942 Q0304_6ystemduc 3 <br />