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3• GROUNDWATER TREATMENT SYSTEM OPERATION <br /> • <br />' A vacuum vaporizer well system, known as UVB (Unterdruck Verdampfer Brunnen), began <br /> Operating at the site on 6 February 1997 A description of the UVB system is included in an <br /> installation report issued in June 1997 The UVB system did not operate during the second quarter <br />' of 2001 The system was shut down on 22 September 2000 as proposed during the 12 September <br /> 2000 meeting between San Joaquin County Public Health Services and ExxonMobil Refining and <br /> Supply Company As of 22 September 2000, approximately 1,916 pounds of TPH-g have been <br />' stripped from the groundwater Table 2 provides a summary of 2000 field data and laboratory <br /> analytical results for the UVB system A graphic representation of the UVB system performance <br /> to date is shown in Figure 3 <br />' 4. WORK PROPOSED FOR NEXTQ UARTER <br />' Depths to water will be measured and groundwater samples will be collected in September 2001 <br /> The samples will be analyzed for TPH-g, BTEX, and MTBE <br />' A risk assessment has been performed at the site, and a report will be submitted to the California <br /> Regional Water Quality Control Board in August 2001 <br /> I <br /> E <br /> I <br /> I <br /> I <br /> I0 Trojeas%73942WAS1 PR1WP\p601Vx doc 2 <br />