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7-Eleven./Stockton y May, 1989 o Submitted final permit applications For the installation of two additional monitoring wells and two monitoring well nests to the San Joaquin county Department of Environmental health in accordance with the work plan approved by Southland Corporation. GROUNDWATER MONITORING Monitoring of the groundwater elevation level in the monitoring wells was conducted on a twice-a-month schedule. These monitoring data are presented in Table 1 (Appendix A) . Groundwater monitoring was performed in accordance with GTI's Standard operating Procedure (SOP) a (Appendix S) . Analyses of the groundwater monitoring data indicate that groundwater levels rose an average of 0.715 foot during this three-month reporting period in response to normal seasonal y recharge. This rise in the groundwater levels is depicted in the hydrographs for MW-7, MW-8, and MW-10 (Figure 3) . These wells represent the average variation in groundwater elevation measured in the majority of wells which were monitored during this reporting period. The one exception to this normal seasonal profile is the data from MW-9 which reflects a mounding of the -' groundwater surface due to a leaking water pipe at the rear of the 7-Elcven Store. This condition persisted during this reporting period, but appears to be diminishing. Groundwater Gradient Maps (Figures 4, 5, and b) represent the interpreted groundwater-table elevations beneath the site for each of the three months in this reporting period. The regional groundwater-gradient direction remains consistently to the east- southeast, as reported in the past. The gradient is calculated w. at a consistent 0.002 ft/f:. slope. GROIADIVATER i Ttctmrnocr INC.