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1 <br /> ADDITIONAL GROUND WATER MONITORING WELL INSTALLATION AND <br /> QUARTERLY GROUND WATER MONITORING REPORT. FIRST QUARTER 1992 <br /> Exxon Station RIS 7-3708 <br /> 2705 Country Club Boulevard <br /> Stockton, Califorrua <br /> Delta Project No 40-91-838 <br /> Page 6 <br /> ' TABLE 2-Continued <br /> Ground Water Level Measurements <br /> ' MW-5 02111/92 1326 -0 80° -1406 <br /> 03/18/92 11.22 -1202 <br /> MW-602/11/92 13.56 -0 51e -1407 <br /> 03/18/92 11.49 -1200 <br /> a Reference points at the to of the well risers were surveyed relative to California Department of <br /> p p Y <br /> Transportation bench mark No 1618L, elevation = 0 728-feet above mean sea level <br /> ' b Initial survey conducted on 08/23/91 <br /> c Wells resurveyed on 03/18/92 <br /> 3.2 Ground Water Qualitx <br /> Ground water samples were collected from monitoring wells MW-4 through MW-6 on February 10 and <br /> 11, 1992, and from monitoring wells MW-1 through MW-6 on March 19, 1992, using procedures <br /> described in Appendix A Ground water samples were submitted for laboratory analysis of BTEX and <br /> TPH as gasoline Ground water sample analytical results for the February and March 1992 sampling <br /> ' events are summarized in Table 3, along with previous analytical results Copies of the ground water <br /> analytical laboratory reports are included in Appendix F. Based on the March 18, 1992, sampling event, <br /> ' the inferred distribution of benzene and TPH as gasoline in ground water is illustrated in Figures 4 and <br /> 5, respectively <br /> RPTI12 JDM <br />