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I <br /> QUARTERLY MONITORING REPORT,January, 1998 <br /> CANLPA S CAR WASH <br /> 6230 Pacific Avenue,Stockton CA <br /> February 10, 1998 <br /> Page -4 <br />' TABLE 1 <br /> Groundwater Elevation Data(January 20, 1998) <br /> MW-1 through MW-8 <br />' Well Well Casing Well Collar Depth to Groundwater <br /> ]ED Screen Elevation Water Elevation <br /> Interval (feet) (feet) (feet) <br /> (feet- bgs) <br />' MW-1 50 - 70 134S 39 17 -25 72 <br /> MW-2 50- 70 13 27 3894 -2S67 <br />' MW-3 50 - 70 13 50 3955 -2605 <br /> MW-4 50 - 70 13 82 3966 -25 84 <br />' MW-5 50 - 70 1269 3862 -2593 <br /> MW-6 45 - 65 1162 1 38 30 -2668 <br />' MW-7 45 - 65 13 18 3943 -2625 <br /> MW-8 45 - 65 1326 39 37 -26 11 <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 (TPH-G) by Method 5030/LUFT, for benzene, toluene, ethyl <br />' benzene, and xylene (BTEX) by EPA Method 602, and for gasoline oxygenates/additives by EPA <br /> Method 8260 The gasoline oxygenates/additives include methyl tertiary-butyl ether (MTBE), ethanol, <br /> tertiary-butanol, di-isopropyl ether (RIPE), ethyl tertiary-butyl ether (ETBE), and tertiary-amyl methyl <br /> ether(TAME) <br /> TPII-G was detected in groundwater samples collected from MW-1, MW-2, MW-4, and SV-8 at <br />' concentrations ranging from 0 11 to 310 mg/1 BTEX constituents were detected in MW-1, MW-2, MW- <br /> 4, and SV-8 at concentrations ranging from 2 0 to 87,000 µg/1 MTBE was detected in samples collected <br /> from MW-1, MW-3, and SV-8 at concentrations ranging from 13 to 6,400 4g/1 Chemical analyses <br /> indicated that gasoline oxygenates/additives, excluding MTBE, were not detected, at or above the <br /> laboratory reported detection limits in any of the samples analyzed Chemical analyses also Indicated <br /> that the groundwater samples collected from monitor wells MW-5, MW-6, MW-7, and MW-8 did not <br /> contain BTEX, gasoline oxygenate Vadditi ves, or TPH-G at or above the laboratory reported detection <br /> limits A summary of the current groundwater sampling results is presented in Table 2 below, and in <br /> Figure 2, Appendix A Laboratory report sheets indicating analytical methods used, detection limits, and <br /> the results of the analyses are contained m Appendix D The historical groundwater analyses are <br /> presented in Table A, Appendix B <br />' �V CONDOR <br />