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IQuarterly Monitoring Report April 2001 <br /> . Canepa s Car Wash(Pacific Avenue) <br /> a cooler chilled with ice, and delivered, in accordance with chain-of custody procedures, to <br /> IGeoAnalytical Labofatofies, Inc in Modesto, California, for analyses <br /> 4.0 GROUNDWATER MONITORING RESULTS <br /> 4 1 GROUNDWATER ELEVATION CONTOURS <br /> On April 10, 2001, 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 32 1 feet below the well <br /> measuring points on top of the well casings, slightly below the ground surface The average depth to <br /> groundwater decreased approximately 0 7 feet since the previous monitoring event conducted in January <br /> 2001 The groundwater elevations ranged from 18 55 to 19 61 feet below mean sea level (bmsl) The <br /> groundwater elevation contour map (Figure 2, Appendix A) indicates groundwater mounding in the <br /> center of the site in the vicinity of MW-1 and MW-2 See Table I (below) for groundwater elevation <br /> I data A hydrograph of groundwater elevations is included as Figure 3, Appendix A Note from the <br /> hydrograph in Figure 5 and a comparison of the top of the wel l casing screen interval versus the depth to <br /> water in Table 1 that all wells are drowned, i e the water table is 14 to 18 feet above the top of the <br /> screen <br /> TABLE 1 <br /> GROUNDWATER ELEVATION DATA(APRIL 10, 2001) <br /> MW-1 THROUGH MW-8 <br /> Well Well Casing Well Collar Depth to Groundwater <br /> lie <br /> ID Screen Elevation Water Elevation <br /> Interval (feet) (feet) (feet) <br /> (feet—bgs) <br /> MW-1 50-70 13 45 32 14 -1869 <br /> MW-2 50 -70 1327 31 82 -1855 <br /> MW-3 50 -70 13 50 32 53 -1903 <br /> MW-4 50-70 13 82 3279 -1897 <br /> MW-5 50 -70 1269 31 84 -19 15 <br /> MW-6 45 -65 11 62 31 23 -1961 <br /> MW-7 45 - 65 13 18 3220 -1902 <br /> MW-8 45 -65 1326 32 10 -18 84 <br /> 4 2 LABORATORY ANALYSES <br /> The groundwater samples were analyzed by GeoAnalytical Laboratories, Inc for total petroleum <br /> hydrocarbons quantified as gasoline (TPH-G) by EPA Method 5030/LUFT The groundwater samples <br /> were also analyzed for methyl tertiary-butyl ether (MTBE) and for benzene, toluene, ethyl benzene, and <br /> total xylenes (BTEX) by EPA Method 8021 B <br /> %J <br /> CONDOR <br />