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Quarterly Momtormg Report,January 2000 <br /> Canepa's Car Wash(Pacific Avenue) <br /> February 28,2000 <br /> Page -3 <br /> The groundwater sample obtained from MW-1 was collected by filling two 40-milliliter 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 chain-of-custody procedures, to GeoAnalytical <br /> Laboratories, Inc in Modesto, California, for analyses <br /> 4.0 GROUNDWATER MONITORING RESULTS <br /> 4.1 GROUNDWATER ELEVATION CONTOURS <br /> On January 13, 2000,the depth to groundwater was measured in each monitor well prior to the collection <br /> of groundwater samples The average depth to groundwater was approximately 33 3 feet below the well <br /> measuring points The measuring points are slightly below the ground surface The average depth to <br /> groundwater decreased approximately 1 1 feet since the previous monitoring event conducted in October <br /> 1999 The groundwater elevations ranged from 19 88 to 20 94 feet below mean sea level (bmsl) The <br /> groundwater elevation contour map (Figure 3, Appendix A) indicates groundwater mounding in the <br /> center of the site in the vicinity of MW-1 and MW-2 See Table 1 (below) for groundwater elevation <br /> data A hydrograph of groundwater elevations is included as Figure 4, Appendix A <br /> I TABLE 1 <br /> GROUNDWATER ELEVATION DATA(JANUARY 13, 2000) <br /> MW-1 THROUGH MW-8 <br /> Well WeII 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 1345 3344 -1999 <br /> MW-2 50-70 1327 33 15 -19 88 <br /> MW-3 50-70 1350 3372 -2022 <br /> MW4 50-70 13 82 3396 -2014 <br /> MW-5 50-70 1269 3299 -2030 <br /> MW-6 45 -65 1162 3256 -2094 <br /> IMW-7 45 -65 13 18 3355 -2037 <br /> MW-8 45 - 65 1326 3339 -2013 <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 Method 5030/LLTFT, for benzene, toluene, ethyl - <br /> benzene, and total xylenes (BTEX) by EPA Method 602, and methyl tertiary-butyl ether (MTBE) by <br /> EPA Method 8260 <br /> ILJ CONDOR <br />