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Quarterly Monitoring Report,October 1999 <br /> Canepa's Car Wash(Pacific Avenue) <br /> L, November 22, 1999 <br /> Page -3 <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,within approximately 24 hours of sample collection. <br /> Lo <br /> 4.0 GROUNDWATER MONITORING RESULTS <br /> a. 4.1 GROUNDWATER ELEVATION CONTOURS <br /> On October 13, 1999, 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 34.4 feet below the well <br /> measuring points (slightly below the ground surface). The average depth to groundwater increased <br /> approximately 0.7 feet since the previous monitoring event conducted in July 1999. The groundwater <br /> elevation ranged from 20.98 to 21.98 feet below mean sea level (bmsl). The groundwater elevation <br /> contour map (Figure 3, Appendix A) indicates groundwater mounding in the center of the site in the <br /> vicinity of MW-I and MW-2. See Table I (below) for groundwater elevation data. A hydrograph of <br /> groundwater elevations is included as Figure 4, Appendix A. <br /> TABLE 1 <br /> GROUNDWATER ELEVATION DATA(OCTOBER 13, 1999) <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 34.45 -21.00 <br /> MW-2 50-70 13.27 34.25 -20.98 <br /> MW-3 50-70 13.50 34.74 -21.24 <br /> s. <br /> MW-4 50-70 13.82 34.81 -20.99 <br /> w. <br /> MW-5 50-70 12.69 33.76 -21.07 <br /> MW-6 45 -65 11.62 33.60 -21.98 <br /> MW-7 45 -65 13.18 34.73 -21.55 <br /> MW-8 45-65 13.26 34.6I -21.35 <br /> dmp 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/LUFT; for benzene, toluene, ethyl <br /> �• benzene, and total xylenes (BTEX)and methyl tertiary-butyl ether(MTBE) by EPA Method 602. <br /> 4M N41� <br /> %J CONDOR <br /> 4w <br />