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I Quarterly Monitoring Report July 1998 Canepa s Car Wash 248 F Park St Stockton CA Autus124 1998 Page 3 4 2 Results of Analyses Laboratory analysis of the groundwater sample collected from MW-4 indicated that BTEX and TPH-G were not detected at or above the laboratory reported detection limits Laboratory analytical results indicated that ' TPH-G was detected in the groundwater samples collected from MW-1 at 0 09 mg/L, MW-2 at 18 mg/L, MW- 3 at 0 8 mg/L, MW-5 at 23 mg/L, MW-6 at 0 06 mg/L, and MW-7 at 0 1 mg/L BTEX constituents were detected in the groundwater samples collected from all of the monitor wells sampled, excluding MW-4, ranging from 0 6 µg/L (MW-1 and MW-6) to 2,600 µg/L (MW-5) Gasoline oxygenates/additives were not detected at or above the laboratory reported detection limits in any of the groundwater samples collected from the monitor wells with the exception of MTBE, at 8 4 µg/L, in the sample from MW-6 The laboratory results are presented ' In Table 1, below and Figure 2, Appendix A TABLE 1 ' Groundwater Analytical Results (July 1998) MW-1 through MW-7 B T E X MTBE Other TPH-G Oxygenates/ Additives ' MONITOR Detection 0 3 03 03 06 10 See 005 WELL/ DATE Llmits--� µg/1 µg/1 lig/1 µg/1 gg/l Laboratory mg/1 SAMPLE Sample I A Report Sheet MW-1 7/23/98 2038-MW1-7/23/98 ND 06 ND ND ND ND 009 MW-2 7/23/98 2038-MW2-7/23/98 440 20 360 630 ND* ND* 18 MW-3 7/23/98 2038-MW3-7/23/98 1 2 22 42 56 ND ND 08 MW-4 7/23/98 2038-MW4-7/23/98 ND ND ND ND ND ND ND MW-5 7/23/98 2038-MW5-7/23/98 2,600 1,500 550 1,400 ND* ND* 23 MW-6 7/23/98 2038-MW6-7/23/98 ND 06 ND ND 84 ND 006 MW-7 7/23/98 2038-MW7-7/23/98 1 1 12 ND ND ND ND 01 Unit Conversions Anal ty is d pg/l parts per billion(ppb) B,T,E X=benzene,toluene,ethyl benzene,and xylene mg/l parts per mlllton(ppm) TPH-G=total petroleum hydrocarbons quantified as gasoline MTBE—Methyl tertiary Butyl Ether Other Oxygenates/Additives=ethanol Di-isopropyl ether Ethyl tertiary-Butyl Ether, tertiary-amyl MLthyl Ether and tt_rtiary-Butanol ND=none detected at or above reported laboratory detection limit ND*=detection limit ratsed due to elevated concentrations(See Laboratory Report Sheets) `J CONDOR