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1 <br /> Quarterly Monitoring Report April 1999 <br /> Carlepa s Car Wash(Pacific Avenue) <br /> May 31 1999 <br /> Pane -5 <br /> from approviniately 53 feet to 32 5 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-I and MW- <br />' 2 The groundwater mounding effect identified during the April 1999, quarterly groundwater monitoring <br /> event 1s generally consistent with previous monitoring results <br /> 'I fie second quarter, 1999, Iaboratory 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, MW-2, and SVE-6 A low concentration of MTBE was detected in the <br /> grouindvvater sample collected from MW-3 Low concentrations of toluene and TPH-G were detected in <br /> the groundwater sample collected from MW-4 <br />' 6 0 RECOMMENDATIONS <br /> In the Report -- Soil and Groundii,ater 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 /> desct ibmb the recommended additional investigation activities In response to Mr Rowe's request, <br /> Condor submitted a work plan dated November 17, 1998, describing proposed additional Investigative <br /> activities including the installation of additional monitor wells and soil borings Upon review of the <br /> wort: plan, Mr Rowe requested that the work plan be modified to include deep aquifer characterization <br /> with a cone penetrometer Condor is currently preparing a work plan addendum describing the requested <br />' deep aquifer characterization <br /> The nevt quarterly monitoring event is scheduled for July, 1999 If you need additional information or <br />' have any questions, please contact us at(209) 234-0518 <br /> Respectfully submitted, <br /> CONDOR EARTH TECHNOLOGIES, INC <br /> DOW E KMESSE <br /> R David Meade Donald F Kresse ip NO.6430 Q` F, <br /> PiofectGeologist California Registered <br /> Geologist 46430 lFOF <br /> CA1-���� <br /> 111767 Canep i PanfioOuartcri� A4pmtnrinb11999 4p IROM1,299 doc <br /> I <br /> k <br /> t� CONDOR <br />