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Quarterly Monitoring Report April 2000 <br /> Canepa s Car Wash(Pacific Avenue) <br /> Page -3 j <br /> 3 2 GROUNDWATER SAMPLING <br /> IThe groundwater samples obtained from monitor wells MW-2 through MW-8, and SV-9 were collected <br /> by gently diaining the groundwatei from each bailer with a bottom-emptying device directly into two 40- <br /> nulhlilei glass vials <br /> The groundwater sample obtained from MW-I was collected by filling two 40-ixiilliliter glass vials with <br /> groundwater directly from the pump discharge tubing The sample containers were labeled, placed in a <br /> cooler chilled with ice, and delivered, in accordance with Chaim-of-custody procedures, to GeoAnalyttcai <br /> Laboiatories, Inc in Modesto, California, for analyses <br /> 4.0 GROUNDWATER MONITORING RESULTS <br /> 4.1 GROUNDWATER ELEVATION CONTOURS <br /> On April 11, 2000, 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 31 8 feet below the well <br /> measuring points The measuring points are slightly below the ground surface The average depth to <br /> groundwater decreased approximately 15 feet since the previous monitoring event conducted in January <br /> 2000 The groundwater elevations ranged from 18 29 to 19 36 feet below mean sea level (binsl) 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-I and MW-2 and illustrates the existence of a major groundwater <br /> gradient to the west and a minor groundwater gradient to the northeast Groundwater elevation data is <br /> presented in Table 1 A hydrograph of groundwater elevations is included as Figure 6, Appendix A Note <br /> I, from the hydrograph in Figure 6 and a comparison of the top of the well casing screen interval versus the <br /> depth to water m Table 1 that all wells are di owned, i e the water table is 13 to 19 feet above the top of <br /> the screen <br /> TABLE 1 <br /> GROUNDWATER ELEVATION DATA (APRIL 11,2000) <br /> MW-1 THROUGH MW-8 <br /> Well Well Casing Well Collar Depth to Groundwater <br /> ID ,Screen Elevation Water Elevation <br /> Interval (feet) (feet) (feet) <br /> (feet—bgs) <br /> MW-1 50-70 13 45 31 88 -1843 <br /> MW-2 50-70 1327 31 56 -1829 <br /> MW-3 50-70 13 50 32 12 -1862 <br /> MW-4 50-70 13 82 3237 -18 55 <br /> MW-5 50-70 1269 31 36 -i 8 67 <br /> MW-6 45 -65 11 62 3098 -1936 <br /> MW-7 45 -65 13 18 31 97 -1879 <br /> . MW-8 45 -65 1326 31 82 -18 56 <br />' t� CONDOR <br />