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I <br /> 3 GROUNDWATER TREATMENT SYSTEM OPERATION <br /> i <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 first quarter of <br /> 2001 The system was shut down on 22 September 2000 as proposed during the 12 September 2000 <br /> meeting between San Joaquin County Public Health Services and ExxonMobil Refunung and Supply <br /> Company As of 22 September 2000, approximately 1,916 pounds of TPH-g have been stripped <br /> from the groundwater Table 2 provides a summary of 2000 field data and laboratory analytical <br /> results for the UVB system A graphic representation of the UVB system performance to date is <br /> 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 June 2001 The <br /> 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 May 2001 <br /> I <br /> I <br /> IF'Pioje�w7=942WAS(FRMP'Q301\1\dog 2 <br />