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' REMEDIATION SYSTEM SUMMARY <br /> i <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 WB 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 WB 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 /> ISystem startup date, 6 February 1997 <br /> Active extraction wells None <br />' Inactive extraction wells/reason• WB (The system was shut down on 22 September 2000 as <br /> proposed during the 12 September 2000 meeting between San <br /> I 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 /> 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 /> G'P'oJcQsN73Q42%PUIILIC 0_&_M\Qujner1�Progress Rein+v200313942 012o3_systrm-loc 3 <br />