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I AZURE ENVIRONMENTAL <br /> Ground-water monitoring data continue to indicate the petroleum hydrocarbon plume has <br />' stabilized and is restricted to shallow ground water in the area adjacent to the former tank <br /> locations at the Site Residual petroleum hydrocarbon concentrations in Site ground water are <br />' expected to decrease as a result of biodegradation and/or other attenuation processes <br /> 4.0 TECHNICAL STATUS REPORT <br />' Work Completed During the Fourth Quarter 1997 <br />' Work completed during the third quarter included performance of the quarterly ground-water <br /> monitoring program <br />' On October 2, 1997, a water sample was collected at the well head of the fire system well at the <br /> Site The sample was sent to the laboratory for analysis of volatile organic and oxygenated <br /> compounds using EPA Method 8260 Sample results indicate no EPA Method 8260 analytes <br />' were detected in the well sample The sample laboratory certificate is included in Appendix A <br /> Work Expected to be Completed During the First Quarter 1998 <br />' Work expected to be completed during the first quarter includes continued performance of the <br /> • quarterly ground-water monitoring program <br />' Pursuant to the CRW CB-Central Valley Region's requirements presented in their July 18 1997 <br />' letter, ground-water samples collected during the fourth quarter 1997 were analyzed for <br /> oxygenate compounds using EPA Method 8260 Results indicate oxygenate compounds were not <br /> detected (see Laboratory Certificates in Appendix A) Additionally, historical results of MTBE <br />' analyses using EPA Method 8020 indicate MTBE has never been detected in ground-water <br /> samples from the Site (Table 3) Based on analysis results indicating oxygenate compounds do <br /> not appear to be present at the Site, it is recommended that sample analyses using EPA Method <br />' 8260 be discontinued <br /> r <br />