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QUARTERLY MONITORING REPORT,April 1998 CANEPA S CAR WASH 6230 Pacific Avenue Stockton CA May 26, 1998 Page -4 was detected in samples collected from MW-1, MW-2, MW-3, and SV-2 at concentrations ranging from 17 (MW-3) to 26,000 µg/l (SV-2) A summary of the current groundwater sampling results is presented in Table 2 on the following page, and in Figure 2, Appendix A Laboratory report sheets indicating analytical methods used, detection limits, and the results of the analyses are contained In Appendix C Che historical groundwater analyses are presented in Table A, Appendix B TABLE 2 LABORATORY ANALYSES (April, ]998) B T E X TPH-G MTBE Other Oxygenates* Detection lnnits 03 03 03 06 005 10 See Labortary Monitor Well ttg/l µg/l µg/l lig/1 mg/l ttg/l Report Sheets =1707-MWI-44/23/98 5,500 270 370 ND** 14 390 ND I1707-MW2-4/23/98 5,200 1,200 380 1,200 19--[ 73 ND 1707-MW3-4/22/98 ND ND ND ND ND 17 ND 1707-MW4-4/22/98 ND 167 ND ND ND ND ND 1707-MW5-4122198 ND ND ND ND ND ND ND • 1707-MW6-4/23/98 ND ND ND ND ND ND ND 1707-MW7-4/23198 ND ND ND ND ND ND ND 1707-MW8-4/22/98 ND ND ND ND ND ND ND 1707-SV2-4/23/98 49,000 66,000 fjj00E17,000 270 26,000 NDS`* Unit Conversions Analytical pg/I parts per billion(ppb) B,T,E,X=benzene,toluene ethyl benzene and xylene mg/l parts per million(ppm) 1 PH-6=total p"roleum hydrocarbons,quantified as gasoline MTBF=Methyl tertiary Butyl Ether *Other Oxygenates/Additives=ethanol,Di-isopropyl ether Ethyl tertiary- Butvl Ether tetitary-amvl Mt-thyl Fther and tertiary-Butanol ND=none dettctt d at or above reported laboratory detection limit NTS**=detection limit raised due to elevated concentrations(See Laboratory Report Sheets) 5 0 DISCUSSION OF RESULTS The average depth to groundwater was approximately 35 9 feet below the well measuring points at the site The groundwater elevation ranged from 22 41 to 23 51 feet below sea level (bmsl) During the past four years, the depth to groundwater at the site has ranged from approximately 53 feet to 36 feet bgs The groundwater elevation contour map (Figure 3, Appendix A) uidicates groundwater mounding in the center of the site m the vicinity of MW-1 7 his is generally consistent with previous monitoring results I The results of the, laboratory analyses during the April 1998, monitoring event indicate that gasoline oxygenates/additives, excluding MTBE, were not detected at or above the laboratory reported detectio �� CONDOR