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Quarterly Monitoring Report,October 1999 Canepa's Car Wash(Pacific Avenue) Noveinber 22, 1999 Page -3 Egroundwater directly from the pump discharge tubing The sample containers were labeled, placed in a cooler chilled with ice, and delivered, in accordance with chain-of-custody procedures, to GeoAnalytical Laboratories, Inc in Modesto, California, within approximately 24 hours of sample collection 4 0 GROUNDWATER MONITORING RESULTS 4 1 GROUNDWATER ELEVATION CONTOURS On October 13, 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 34 4 feet below the well measuring points (slightly below the ground surface) The average depth to groundwater increased approximately 0 7 feet since the previous monitoring event conducted in July 1999 The groundwater I elevation ranged from 20 98 to 21 98 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 TABLE 1 GROUNDWATER ELEVATION DATA (OCTOBER 13, 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 1345 3445 -21 00 MW-2 50-70 1327 3425 -2098 MW-3 50-70 13 50 3474 -2124 MW-4 50-70 1382 3481 -2099 MW-5 50-70 1269 3376 -2107 MW-6 45 -65 1162 3360 -2198 MW-7 45 -65 13 18 3473 -21 55 MW-8 45 -65 1326 3461 -2135 4 2 LABORATORY ANALYSES The groundwater samples were analyzed by GeoAnalytical Laboratories, Inc for total petroleum I hydrocarbons quantified as gasoline (TPH-G) by Method 5030/LUFT, for benzene, toluene, ethyl benzene, and total xylenes (BTEX) and methyl tertiary-butyl ether(MTBE)by EPA Method 602 It J CONDOR