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ADDITiQNAL GROUND WATER MONITORING WELL INSTALLATION AND <br /> 4UARTERLY GROUND WATER MONITORING REPORT. FIRST QUARTER 1992 <br /> Exxon Station RIS 7-3708 <br /> 2705 Country Club Boulevard <br /> Stockton, Cahfonua <br /> Delta Project No 40-91-838 <br /> Page 5 <br /> ' As shown in Table 2, the static water level in the monitoring wells varied from approximately 11 22 feet <br /> to 13.82 feet below the top of casings during the March 1992 measurements. The direction of ground <br /> ' water flow beneath the site was calculated for each date that water levels were measured and the ground <br /> water flow direction has consistently been inferred to be towards the northeast at an average gradient of <br /> 0 001 foot per fgot Figure 3 shows the inferred contours of the groundwater surface and the calculated <br /> direction of ground water flow based on measurements taken on March 18, 1992 <br /> TABLE 2 <br /> Ground Water Level Measurements <br /> ' Monitoring Depth to Ground Reference' Ground Water <br /> Well Date Water VElevation (ft) Elevation (ft) <br /> MW-1 08/23/91 1639 1-95b -14 " <br /> 08/29/91 1649 -1454 <br /> 12/13/91 1666 -1471 <br /> ' 02/11/92 1574 1.92° -13 82 <br /> 03/18/92 1370 -11 78 <br /> MW-2 08/23/91 1659 2 09b -1450 <br /> ' 08/29/91 1669 -1460 <br /> 12/13/91 16.81 -1472 <br /> 02/11/92 1589 2 07c -1382 <br /> ' 03/18/92 1382 -1175 <br /> MW-3 08/23/91 15 15 0.52b -1463 <br /> 08/29/91 1526 -1474 <br /> 12/13/91 1540 -1488 <br /> 02/11/92 1447 0 50° -1397 <br /> 03/18/92 1237 -11 87 <br /> MW-4 02/11/92 1361 -0 38° -1399 <br /> 03/18/92 1160 -1198 <br /> ' RPTI 12 IDM <br />