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1 <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 able of Verdam fer Brunnen ,is ca <br /> P ) P <br /> extracting groundwater from one well,LJVB The UVB treatment system consists of an in situ,400- <br /> millimeter-diameter reduced pressure air stnpper 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 LJVB air stripper are extracted by the UVB vacuum blower The pressure outlet of the UVB <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 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 /> IThe UVB system did not operate <br /> System performance data totals (totals since system startup) <br /> IGroundwater extracted. Not applicable <br /> Pounds of TPH removed- 1,998 7 (calculated as TPH-g) <br /> IPounds of benzene removed- 1845 j <br /> Pounds of MTBE removed- Not calculated <br /> i <br /> IUVB system proposed work <br /> I <br /> IThe UVB system will remain shut down <br /> • <br /> I <br /> G Trojects1739421PUBLJCt0_&_?&Quarterly Progress KeWrr1204A3942 Q06"_swem dw 3 <br /> I <br />