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1 <br />' Quarterly Mcnrionng Ripon January 1998 <br /> Cancpa s Car Wash <br /> 246 r Park St Stockton CA <br /> March 12 1" <br /> 01 <br /> Page 4 <br /> 4 3 Groundwater Elevation Contours <br />' On January 22, 1998, the depth to groundwater was measured in each monitor well prior to the collection of <br /> groundwater samples The average depth to groundwater was approximately 29 7 feet bgs at the site Monitor <br />' wells MW-1, MW-2, and MW-3 are screened from approximately 45 to 65 feet bgs. and monitor wells MW-4, <br /> MW-5, MW-6, and MW-7 are screened from approximately 40 to 60 feet bgs Therefore, water levels were <br /> substantially above the top of the screen in each monitor well The groundwater elevation ranged from 19 31 <br />' to 17 74 feet below mean sea level (bmsi) at the site See Table 2, below, for groundwater elevation data <br /> Groundwater elevation contours are shown in Figure 3, Appendix A The groundwater elevation contours <br /> indicate a northeast groundwater flow towards the general vicinity of MW-2 <br /> T <br /> ABLE 2 <br />' Groundwater Elevation Data (January 22, 1998) <br /> MW-1 through MW-7 <br />' Well Well Casing Well Collar Depth to Groundwater <br /> ID Screen Elevation Water Elevation <br /> Interval(feet (feet) (feet) (feet) <br />' - bgs} <br /> MW-1 45 -65 1097 2871 -1774 <br /> 10 <br /> MW-2 45 -65 1037 2968 -1931 <br /> MW-3 45 -65 1176 30 35 -1859 <br />' MW-4 40-60 1085 ---- ---- <br /> MW-5 40- 60 1125 30 18 -1893 <br />' MW-6 40- 60 1172 30 18 -1846 <br /> MW-7 40-60 1105 29 12 1807 <br /> 5 DISCUSSION OF RESULTS <br /> Since September, 1994, the depth to groundwater at the site has decreased from approximately 45 to 29 bgs <br /> The groundwater elevation contour map (Figure 3, Appendix A) indicates that groundwater flows in a northeast <br /> direction toward the general vicinity of MW-2 This is generally consistent with previous monitoring results <br /> A hydrograph of monitor wells MW-1 through MW-7 (Figure 4, Appendix A) illustrates the fluctuation of the <br /> groundwater table Historical groundwater measurements are provided in the accompanying Hydrograph Table <br /> (Appendix A) <br /> Analytical results for the January, 1998, sampling are generally consistent with historical analytical results <br /> TPH-G and BTEX concentrations in the sample collected from MW-5 have increased markedly since August of <br /> �� CONDOR <br />