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• THIRD QUARTER,2003 <br /> GROUNDWATER MONITORING REPORT <br /> JAMAR OIL DISTRIBUTION <br /> NOVEMBER 2003 <br /> On May 19-23, 2003 one on-site extraction well (EW-1) and two sets of off-site, clustered, <br /> monitoring wells(MW-6A, MW-613 and MW-7A, MW-713) were installed (See Figure 2). The <br /> monitoring wells further defined downgradient extent of impacted groundwater. An aquifer <br /> performance test (APT)which was conducted on EW-1 on May 22, 2003. <br /> A Sensitive Receptor Survey(SRS)was conducted during May 2003. Results of the well <br /> installation, APT, SRS and quarterly monitoring were documented in the Second Quarter 2003 <br /> Groundwater Monitoring Report and Additional Assessment Report dated June 2003. <br /> The County responded to the Second Quarter 2003 Groundwater Monitoring Report and <br /> Additional Assessment Report in a letter dated August 22, 2003 (See Appendix A), concurring <br /> with GHH's proposal to install an interim remediation system and directing that additional site - <br /> investigation work be conducted to define the limits of MTBE impacted groundwater to the easter <br /> of the site. <br /> On October 22, 2003, GM submitted an Additional Assessment Workplan and on October 30, <br /> 2003, GHH submitted an Interim Groundwater Treatment System Installation Workplan. These <br /> workplans are currently pending review and approval by the County. <br /> SCOPE OF WORK <br /> The following is a brief summary of the scope of work authorized by JAMAR, which consisted of <br /> conducting third quarter groundwater monitoring on September 11, 2003. <br /> • Locate and measure depths to groundwater in wells MW-1 through MW-5, EW-1, <br /> MW-6A, MW-613, MW-7A, and MW-713. <br /> • Purge a minimum of three equivalent well volumes of groundwater from each of the <br /> wells, and monitor pH, temperature and conductivity. <br /> ft Collect groundwater samples from all the wells. <br /> • Analyze groundwater samples-for total petroleum hydrocarbons as gasoline (TPH G), <br /> benzene, toluene, ethylbenzene, and total xylenes (BTEX); 1,2-dichloroethane (1,2- <br /> DCA), ethyl dibromide (EDB), and the fuel oxygenates MTBE, TBA, DIPE, ETBE <br /> and TAME using EPA Methods 8015 Modified and 8260B, respectively. -- <br /> • Prepare this QMR for submittal to Jamar and the appropriate regulatory agencies. <br /> 3 <br /> I <br /> I <br />