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1 <br /> Quarterly Monitoring Report,October 1998 <br /> Canepa s Car Wash(Pacdfic Avenue) <br /> November 17, 1998 <br /> Page -5 <br />' ranged from approximately 53 feet to 35 feet bgs The groundwater elevation contour map (Figure 3, <br /> Appendix A) indicates groundwater mounding in the center of the site in the vicinity of MW-1 and MW- <br /> 2 This is generally consistent with previous monitoring results <br />' The fourth quarter, 1998, laboratory analytical results are consistent with recent historical laboratory <br /> analytical results The laboratory analytical results Indicate that the selected gasoline <br />' oxygenates/additives, excluding MTBE, were not detected at or above the laboratory reported detection <br /> limits in any of the groundwater samples BTEX, TPH-G, and MTBE were detected in the groundwater <br /> samples collected from MW-1 and SV-7 BTEX and TPH-G constituents were detected In the <br />' groundwater sample collected from MW-2 Low concentrations of toluene and TPH-G were detected in <br /> the groundwater sample collected from MW-4 Additionally, low concentrations of toluene and MTBE <br /> were detected in the groundwater samples collected from MW-6 and MW-3, respectively <br /> b 0 RECOMMENDATIONS <br /> Condor recommended the additional investigative activities described in Report—Soil and Groundwater <br /> Investigation, dated June 12, 1998, to further characterize the extent of contamination at the site <br /> Approval of the proposed scope of work was granted by the PHS/EHD in a faxed approval document, <br /> dated July 28, 1998 Further characterization will include the installation of additional monitor wells and <br /> soil borings The existing monitor wells at the site have a screened interval significantly below the <br /> current groundwater table surface and provide little information pertaining to the vadose <br /> zone/groundwater Interface <br /> The next quarterly monitoring event Is scheduled for January, 1999 If you need additional Information <br />' or have any questions, please contact us at(209)234-0518 <br /> Respectfully submitted, <br />' CONDOR EARTH TECHNOLOGIE —.l hTG <br /> 40 I <br /> Q7 cN <br />' D" .40��4'pet�� DONALD F.JESSE <br />' R David Meade viN0.6430 <br /> J, nald F Kresse <br /> Project Geologist 'qT ��P,r� altfornia Registered <br /> CA 'o Geologist#6430 <br /> I <br /> I <br /> P\1707 Canepa PaCIfidQuarterly Monnonng\1988 Octobcr\4QMR98 doc <br /> I <br />' �� CONDOR <br />