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Quarterly Monitoring Report,July 1999 <br /> Canepa s Car Wash(Pacific Avenue) <br /> August 20 1999 <br /> Page 3 <br /> measuring points (slightly below the ground surface) The average depth to groundwater increased <br /> approximately 1 2 feet since the previous monitoring event conducted in April 1999 The groundwater <br />' elevation ranged from 20 27 to 21 28 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-1 and MW-2 See Table 1, 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(JULY 26, 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 33 76 -2031 <br /> MW-2 50-70 13 27 33 54 -2027 <br /> MW-3 50- 70 13 50 3404 -2054 <br /> MW-4 50-70 13 82 34 13 -2031 <br /> MW-5 50-70 1269 33 09 -2040 <br /> MW-6 45 -65 11 62 3290 -21 28 <br /> MW-7 45 -65 13 18 3402 -2084 <br /> MW-8 45 -65 13 26 33 92 -2066 <br /> 4.2 LABORATORY ANALYSES (TPH-G,BTEX,OXYGENATES/ADDITIVES) <br /> The groundwater samples were analyzed by GeoAnalytical Laboratories, Inc for total petroleum <br /> hydrocarbons quantified as gasoline (hPH-G) by Method 5030/LUFT, for benzene, toluene, ethyl <br /> benzene, and total xylenes (BTEX) by EPA Method 602, and for selected gasoline oxygenates/additives <br /> by EPA Method 8260 The gasoline oxygenates/additives include methyl tertiary-butyl ether (MTBE), <br /> ethanol, tertiary-butanol, di-isopropyl ether (DIPS), ethyl tertiary-butyl ether (ETBE), and tertiary-amyl <br /> inethyl ether(TAME) <br /> Laboratory analyses indicated that the selected gasoline oxygenates/additives, excluding MTBE, were <br /> not detected, at of above the laboratory reported detection limits in any of the groundwater samples <br /> However, the laboiatory ieported detection limits associated with the gasoline oxygenates/additives were <br /> iaised for the samples collected from MW-1 and MW-2 due to high concentrations of petroleum <br /> hydrocaibolls , i these samples M I BE was detected in the groundwater samples collected from monitor <br /> wells MW-1, MW-2, and MW-3 at concentrations of 3,800, 130, and 8 6 micrograms per ht g/l}, <br /> elk!? CONDOR <br />