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' REMEDIATION SYSTEM SUMMARY <br /> • <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 UVB treatment system consisted of an in-situ, <br /> 400-millimeter-diameter reduced pressure air stripper and a 5-horsepower blower and included a <br /> weatherproof cover and moisture knockout drum The moisture knockout drum had a built-in <br /> stripping unit to treat any accumulated water prior to removal Vapors stripped from groundwater in <br /> the UVB air stripper were extracted by the UVB vacuum blower The pressure outlet of the UVB <br /> blower was 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 />' 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 /> I <br /> • <br /> IG 1PTOJe s1739421PUBUMO_ MSQuarterly Rogrss Report}20051I942 Q1005_"em doc 3 <br />