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} Quarterly Groundwater Monitoring Report <br /> Foi mer E-Z Serve Location 100966 <br /> 2537 Waterloo Road <br /> Stockton,California <br /> Delta Project No RPMSO-966 <br /> Page 4 <br /> 3.0 CONCLUSIONS AND RECOMMENDATIONS <br /> 31 Conclusions <br /> Groundwater table elevation data were used to plot the groundwater table elevation on June 10, 2005 <br /> presented on Figure 4 — Groundwater Elevation Map Monitoring wells MW-1, MW-2, MW-3, MW-4, <br /> MW-5, MW-6, MW-7, MW-8, and MW-16 are twenty to thirty feet deeper than monitoring wells MW-9, <br /> MW-10, MW-11, MW-12, MW-13,MW-14, MW-15, MW-17, VW-1, VW-2, and VW-3 <br /> Reported analytical data for the groundwater samples collected on June 10, 2005 indicate that benzene <br /> concentrations have remained below laboratory reporting limits (BRL) in all but two of the deeper <br /> monitoring wells, and in two of the four down-gradient shallow wells Reported MTBE concentrations <br /> remained constant in the deep well located in the UST location and decreased in the equivalent shallow <br /> well MTBE concentrations increased in one shallow well and decreased in one shallow and five deep <br /> wells, all located down-gradient from the UST's <br /> 32 Recommendations <br /> • Based on the above conclusions, Delta recommends continued quarterly groundwater monitoring and <br /> sampling Delta has submitted a work plan for the installation of down gradient monitoring wells The <br /> work plan was approved by the San Joaquin County Department of Environmental Health on April 8, <br /> 2005 Delta anticipates implementation of the work plan in late August or early September 2005 <br /> S\Remediation Und\Achve Clients\Restructure Petroleum\Project Fdes\100966 Stockton 2537 Waterloo Road\100966 <br /> 2ndO5QMR doe <br />