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.� 1+ <br /> Ogarterly Groundwater Monitoring <br /> Report <br /> Former E-Z Serve Location 100966 <br /> 2537 Waterloo Road <br /> Stockton,California <br /> Delta Project No RPMSO-965 <br /> Page 4 <br /> 30 CONCLUSIONS AND RECOMMENDATIONS <br /> 31 Conclusions <br /> Groundwater table elevation data were used to approximate the flow direction and gradient across the site <br /> on February 16, 2005 by contouring Monitoring wells MW-1, MW-2, MW-3, MW-4, MW-5, MW-6, <br /> MW-7, MW-8, and MW-16 are twenty to thirty feet deeper than monitoring wells MW-9, MW-10, MW- <br /> 11, MW-l2, MW-l3, MW-14, MW-15, MW-17, SVE-1, SVE-2, and SVE-3 Data from the deeper wells <br /> were excluded for contouring because the top of their screens are below the water table Based on the <br /> contours presented on Figure 2 --Groundwater Contour Map, the flow direction was toward the west at a <br /> hydraulic gradient of approximately 0 006 <br /> Reported analytical data for the groundwater samples collected on February 16, 2005 indicate that <br /> benzene concentrations have remained below laboratory reporting limits (BRL) in all but two of the <br /> deeper monitoring wells, as well as two of the four down-gradient shallow wells Reported MTBE <br /> concentrations remained constant in the deep well located in the UST location and decreased in the <br /> equivalent shallow well MTBE concentrations increased in one shallow well and decreased in one <br /> shallow and five deep wells, all located down-gradient from the UST's <br /> 3.2 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 May or early June 2005 <br /> E Active Clients\Restructure Petro leum\Prolect Files1100966 Stockton 2537 Waterloo Road1GWM11st Qtr 20051100966 <br /> 1st05QMR doc <br />