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r <br /> were also analyzed for methyl t-butyl ether (MTBE) by EPA Method 8020 and confirmed by <br /> using EPA Method 8260, this was done at the request of Harlin Knoll of the San Joaquin County <br /> r Public Health Services The analytical results for the samples are presented in boldface type in <br /> Table 1, along with previous data The laboratory analytical report and chain-of-custody <br /> documentation are included in Appendix B Groundwater sample analytical results are shown in <br /> rFigures 1 and 2 <br /> 3. GROUNDWATER TREATMENT SYSTEM <br /> A vacuum vaporizer wells stem known as UVB {Unterdruck V <br /> erdarnpfer Brannen} has been <br /> r operating at the site since 6 February 1997 A description of the UVB system is included in an <br /> installation report issued in June 1997 From 10 June to 24 September 1998, the UVB system <br /> was in operation 84 percent of the time Shutdowns were primarily due to power interruptions <br /> and problems with the temperature controls of the oxidizer used for vapor abatement Since the <br /> initial start-up of the UVB system, approximately 672 pounds of TPH-g have been stripped from <br /> the groundwater Table 2 provides a summary of field data and laboratory analytical results for <br /> r the UVB system A graphic representation of the UVB system performance to date is shown in <br /> Figure 4 <br /> r4. WORK PROPOSED FOR NEXT QUARTER <br /> • Depths to water will be measured and groundwater samples will be collected in November 1998 <br /> rThe samples will be analyzed for TPH-g, BTEX, and MTBE <br /> The UVB system will be operated and monitored and results reported in the next quarterly report <br /> r <br /> r <br /> 1 <br /> I <br /> 73942 Q898 rX WPD 2 <br />