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i <br /> Quarterly Monitoring R4port April 2000 <br /> Canepa's Car Wash(Pauhi,Avenue) <br /> Page -6 <br /> Of April 2, 1997 Low concentrations of TPN-G and MTBE were detected in the groundwater sample <br /> collected from MW-3, and a low concentration of toluene and TPH-G were detected in the groundwater <br /> sample collected fiom MW-4 Concentrations of benzene and total xylenes have decreased over time in <br /> MW-1 but show an inci easing trend in MW-2 (Figures 7 and 8, Appendix A) Concentrations of MTBE <br /> I have increased over tine in both MW-I and MW-2, with the greatest rate of increase observed in MW-1 <br /> (Figure 9, Appendix A) The highest concentration of MTBE was detected in the groundwater sample <br /> collected from SV-9, which was not drowned Therefore increased concentrations with higher <br /> groundwater elevations indicate groundwater contact with an additive source Drowned wells are not <br /> sampl ing the fii st water in contact with this additive source <br />' 6 0 RECOMMENDATIONS <br /> In the Report — Sod and Groundwater Investigation, dated June 12, 1998, Condor recommended <br /> additional soil and groundwater investigation to further characterize the extent of contamination at the <br />' site In a faxed document dated July 28, 1998, Mr Ron Rowe of the PHS/EHD requested a work plan <br /> describing the recommended additional investigation activities In response to Mr Rowe's request, <br /> Condor submitted a work plan dated November 17, 1998, describing pioposed additional investigative <br />' activities including the installation of additional monitor wells and soil borings Upon review of the work <br /> plan, Mr Rowe requested that the work plan be modified to include deep aquifer characterization with a <br /> cone penetrometer in a letter dated May 18, 1999,Condor provided a work plan addendum describing <br /> the requested deep aquifer characterization PHS/EHD approval of the work plan is pending <br /> Condor recommends the following <br /> 1.) • That the work plan submitted to the PHS/EHD be approved <br /> • The installation of new monitor wells that are properly screened across the water table <br /> If you need additional information or have any questions, please contact us at(209) 21 �l 8.GFp�O G' <br /> Respectfully submitted, <br /> CONDOR EARTH TECHNOLOGIES, INC pAV1D K WOOD <br /> 16 V 11 <br /> " "'Z <br /> q r ``Foe <br />' Lee H Morse David K Wood OF c0. <br /> Staff Geologist California Registered <br />' Geologist 9 6532 <br /> 11PDC\PRUIECT51S 707 CaiiLpa-Pacitrc\Quarterly Monitoring12000 Apri11QMR2-00 doc <br /> w <br />' 10 A CONDOR <br />