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l <br /> Date: May 19,2003 <br /> Quarter: 151 Quarter,2003 <br /> • DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline(TPHg),benzene,toluene,ethylbenzene and total xylenes were reported in <br /> wells sampled this quarter at concentrations that were generally consistent with previous quarterly monitoring events. <br /> Fuel oxygenates including methyl tert-butyl ether (MtBE), tert-butyl alcohol (TBA), 1,2-dichloroethane (1,2-DCA) <br /> and ethanol were also reported in groundwater samples collected this quarter. Concentrations were generally <br /> consistent with historic data with the following exceptions; MtBE was reported at a historical low of 0.88 <br /> micrograms per liter(µg/L)in VW-4, 1,2-DCA was reported at a historical low of<0.5 µglL in well VW-4, ethanol <br /> was reported for the first time in MW-1 and MW-6 at concentrations of 870 pglL and 45 pg1L respectively. Other <br /> fuel oxygenates were reported as below laboratory reporting limits. Groundwater elevations generally increased in <br /> site wells relative to the previous quarter. The approximate groundwater flow direction at the site was to the <br /> southeast with an average gradient of 0.03 ft/ft. <br /> Three site visits were conducted to optimize and maintain the SVEIAS system. Approximately 26 lbs of TPHg were <br /> removed during the first quarter 2003,with a cumulative mass of 1,718 lbs since startup(09128100).The SVE system <br /> was in compliance with the San Joaquin Valley Unified Air Pollution Control District permit to operate. <br /> This report is based on data, site conditions, and other information that are generally applicable as of the date of the <br /> report,and the conclusions and recommendations herein are therefore applicable only to that time frame. <br /> TABLES <br /> Table 1 Groundwater Elevation and Analytical Data <br /> Table 2 Fuel Oxygenates Analytical Data <br /> Table 3 Floating Product Monitoring Summary Well VW-51) <br /> Table 4 Operational Uptime Information of the Soil Vapor Extraction System <br /> Table 5 Flow Rates and Analytical Results of Air Sample Analyses <br /> Table 6 Extraction and Emission Rates <br /> FIGURES <br /> Figure 1 Groundwater Elevation Contours <br /> Figure 2 Groundwater Analytical Summary <br /> Figure 3 Influent Concentrations vs.Time <br /> Figure 4 Cumulative Mass Removed vs.Time <br /> APPENDICES <br /> Appendix A Field and Laboratory Procedures <br /> Appendix B Laboratory Analytical Reports,Chain-of-Custody Documentation,and Field Data Sheets <br /> 4 <br /> K-1Wpmcem\J5 BP ARMW54811 QTR 031548 GWMR 1Q03_doe Page 2 <br />