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Quarterly Monitoring Report April 1999 Campa s Car Wash(Pacific Avenue) ' May 31 1999 Pale -� 4 0 GROUNDWATER MONITORING RESULTS ' 4 1 GROUNDWATER ELEVATION CONTOURS On April 20, 1999, the depth to groundwater was measured in each monitor well prior to the collection of groundwater samples The average depth to groundwater was approximately 32 5 feet below the well ' measuring points (slightly below the ground surface) The average depth to groundwater decreased approximately one and one-half foot since the previous monitoring event conducted in January 1999 The groundwater elevation ranged from 19 07 to 20 12 feet below mean sea level (bmsl) The groundwater ' elevation contour map (Figure 3, Appendix A) indicates groundwater mounding in the center of the site in the vicinity of MW-1 and MW-2 See Table 1, below, for groundwater elevation data A hydrograph of'groundwater elevations is included as Figure 4, Appendix A 1 TABLE 1 ' GROUNDWATER ELEVATION DATA (APRIL 20, 1999) MW-1 THROUGH MW-8 Well Well Casing Well Collar Depth to Groundwater ID Screen Elevation Water Elevation Interval (feet) (feet) (feet) (feet- bgs) MW-1 50- 70 13 45 32 60 -19 15 MW-2 50- 70 13 27 3234 -1907 MW-3 50- 70 13 50 3291 -1941 MW-4 50-70 13 82 33 14 -1932 MW-5 50-70 12 69 3211 -1942 MW-6 45-65 1162 31 74 -20 12 MW-7 45 -65 13 18 32 75 -1957 MW-8 45-65 13 26 3261 -1935 4 2 LABORATORY ANALYSES (TPH-G,BTEX,OXYGENATES/ADDITIVES) The groundwater samples were analyzed by GeoAnalytical Laboratories, Inc for total petroleum hydrocarbons - quantified as gasoline (IPH-G) by Method 5030/LUFT, for benzene, toluene, ethyl benzene, and total xylenes (BTEX) by EPA Method 602, and for selected gasoline oxygenates/additives by EPA Method 8260 The gasoline oxygenates/additives include methyl tertiary-butyl ether (MTBE) ethanol, tertiary-butanol, di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (CTBE) and tertiary-amyl Innethyl ether(TAMC) k ti� CONDOR