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1 <br /> Quarterly Monitoring Report,April 1998 <br /> Canepa s Car Wash <br /> • 248E Parti St Stockton CA <br /> May 26 19988 <br /> Page 4 <br /> 4 3 Groundwater Elevation Contours <br /> On April 24, 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 25 8 feet below the monitor well <br />' measuring points Monitor wells MW-1, MW-2, and MW-3 are screened from approximately 45 to 65 feet bgs <br /> and monitor wells MW-4, MW-5, MW-6, and MW-7 are screened from approximately 40 to 60 feet bgs <br /> Therefore, water levels were substantially above the top of the screen in each monitor well The groundwater <br />' elevation ranged from 15 70 to 13 67 feet below mean sea level (bmsI) at the site See Table 2, below, for <br /> groundwater elevation data Groundwater elevation contours are shown in Figure 3, Appendix A The <br /> groundwater elevation contours indicate a north-northeast groundwater flow towards the general vicinity of <br />' MW-2 <br /> TABLE 2 <br /> Groundwater Elevation Data (April 24, 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 2507 -14 10 <br /> MW-2 45 -65 1037 2607 -15 70 <br /> MW-3 45 -65 1176 26 65 -1489 <br /> MW-4 40 -60 1085 2452 -1367 <br /> MW-5 40 -60 1125 2651 -1526 <br /> MW-6 40-60 11 72 2650 -1478 <br /> IMW-7 40-60 1105 25 50 -14 45 <br /> 5 DISCUSSION OF RESULTS <br /> Since September 1994, the depth to groundwater at the site has decreased from approximately 45 to 25 bgs <br /> The groundwater elevation contour map (Figure 3, Appendix A) indicates that groundwater flows in a north- <br /> northeast direction toward the general vicinity of MW-2 Iliis is generally consistent with previous monitoring <br /> results A hydrograph of monitor wells MW-1 through MW-7 (Figure 4, Appendix A) illustrates the <br /> fluctuation of the groundwater table Historical groundwater measurements are provided in the accompanying <br /> Hydrograph Table(Appendix A) <br /> IAnalytical results for the April, 1998, sampling are generally consistent with historical analytical results TPH- <br /> . G and BTEX concentrations in the sample collected from MW-5 increased markedly between August 1995, and <br /> I �� CONDOR <br />